Bryant Q674 manual

PRODUCT DATA 60- 248 5 - 8 ® U.S. Re g istered Trademark Cop y ri g ht © 2001 Hone y well • All Ri g hts Reserved T874 Multistage Thermostats and Q674 Subbases APPLICATION These the rmost ats an d subbas es provid e low v olta g e con trol of multista g e heat in g and coo lin g s y stems, inclu din g heat pump s y stem s. FEATURES • T874 The[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 ORDERING INFORMATION When pur cha sin g replace ment and modern ization p roduct s from y our TRADELINE ® whol esaler or distributo r , re fer to th e TRADELINE ® Catalo g or pr ice shee ts for com plete orde rin g numb er . If y ou have additi onal q uestions , need furth er informa ti[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 3 60-2485 — 8 Standard Models T874 TH ERMOSTA TS Models: See T able 3. Electrical Ra ting: 24 to 3 0 V ac. Switching: Coiled bi metal elements operate m ercur y switch es. T emperature Adj ustment: H eatin g and cool in g settin g levers, with se parate scales located o n top o f thermo stat base. C [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 Ke y Lock Co ver: Part no. TG504A re places e xistin g T874 cover . Mounts o n T874 bas e and co vers thermostat set- tlin g leve rs and su bbase switch es. In cludes L ED wind ow and t wo ke y s. Shou ld not be u sed with 1 93121A Adapter Plate. — TG504A102 5: Blan k face, i nternal th[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 5 60-2485 — 8 Models: See T able 4. Electrical Ra tings: Switch Contacts: 2.5A at 30 V ac ( 7.5A inrus h ) . LED L i g hts ( Optiona l ) : 30 V a c. Switches: T wo sli de sw itch es ( one switc h on Q67 4G and K; no switche s on Q674D ) operated b y lever s. Sw itch po sit ion is sho wn on sc aleplat[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 Optional Specifications (Q674 Only ): Models available with up to four LED s; for example, LED s can show EM. HT , AUX. HT , SERVICE, CHECK, FIL TER, and LOCK OUT . See F i g . 3. S y stem switch in g marked HEA T-OFF/RESET-COOL for s y s- tems re q uirin g impedan ce rela y reset. A vail[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 7 60-2485 — 8 MERCURY NOTIC E This con trol contains mercur y in a sealed tube . Do not plac e cont ro l in th e tr ash at the end of its usef ul l ife. If this c ontrol is replacin g a contro l that c ontains mercur y in a se ale d tu be, do not place y our old c ontrol in the tra sh. Contact y our [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 Fig. 5. In stalling Q674 Subbase on wall. Fig. 6. Subb ase components and leveling proc edure. Wire Subbase Disc onnect po wer suppl y before be g innin g install ation to prevent electrical sho ck or e q uipmen t dama g e. All wirin g must co mpl y with lo cal e lectrical codes a nd ordi[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 9 60-2485 — 8 Fig. 8. Jumper adj acent terminals fo r special sy stem hookup using str ipped wi r e 3/4 in . (19 mm) . For nonadja cent termi nals and us ing jumper wire supplied w ith subbas e. T able 5. T erminal Design ations a Standard T erminal Designatio n Alternate De signatio ns or Cust omer [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 Outdoor Disco nnect The N ation al E lec tric al C ode re q uires th e inst allation o f a disco nne ct swit ch w ithi n si g ht of th e out door uni t of an air conditi oner or hea t pump. The switc h is for th e safet y of an y technic ian worki n g on the unit. The techn ician can as[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 1 60-2485 — 8 8. Move th e HEA T and COOL l evers to the ma ximum t em- perature d esired. 9. Slide the stop brac kets un til one res ts a g ainst the HEA T lever an d the o ther a g ainst the COOL lev er . 10. Firml y ti g hten the m ountin g screw . 11 . If the H EA T and COOL levers a re to be l[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 anticip ator at 140 perce nt of the ac tual prim ar y con- trol current d raw to red uce the c y clin g rate. See Fi g . 11 . Most heat pump s y stems sh ould c y cle 2-1/2 t o 3 times p er ho ur . 4. Han g the upp er ed g e of the thermostat cove r on top of the therm ostat bas e and s[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 13 60-2485 — 8 Each ma rk on the scale represents 1 ° F ( 0.6 ° C ) The diff erential is fact or y set a t 2 ° F ( 1 ° C ) the dif ferential ca n be set as hi g h as 12 ° F ( 7 ° C ) T o set the ad j ustable intersta g e diffe rent ial , lo ose n the t ens ion s cre w . See Fi g . 13. Slide the[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 Move th e s y stem s witch on t he Q674 Su bbase to COOL or AUT O. Move the cool settin g lever o n the T874 Multista g e Thermos tat about 10 ° F ( 6 ° C ) bel ow ro om te mpe ratu re. See Fi g . 12. The coolin g e q uipmen t and fan s hould s tart. If th e s y stem h as two s ta g e[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 15 60-2485 — 8 thermos tats. The s chemati cs can b e field-m odified a s re q uired ( EX: if T8 74C is bei n g used , eli mina te s econ d sta g e of he at ) . For heat p ump circui ts: Cool chan g eover valv e — operate s on cool in g . The reve rs- in g valve o r rel a y is act ivated ei ther b [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 Fig. 17. I nternal schem atic and typ ical hookup of a T87 4 R Thermostat a nd Q674L Subbase in a heat pump a pplication. The ther mostat provide s two-stage heating and one-stage cooling ma nual change over ope rates on cooli ng. M5072A (HOT) L1 L2 1 LACO CHP Y B E O G L X W2 W3 R ODT [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 17 60-2485 — 8 Fig. 18. T racing the chang eover relay circuit . Fig. 19. T racing the he at 1 and anti cipation circuit. M5840 L1 (HOT) L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR CHANGEOVER VALVE EM. HT. RELAY RTD 1 [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 Fig. 20. T racing the he at 1 anticipa tion circu it. Fig. 21. T racing the heat 2 , anticip ation and AU X. HT . LED circuit. M5842 L1 (HOT) L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR CHANGEOVER VALVE E[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 19 60-2485 — 8 Fig. 22. T racing the emerge ncy heat an d EM. HT . LED circuit. Fig. 23. T racing the cooli ng circuit. M5844 L1 (HOT) L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR CHANGEOVER VALVE EM. HT. RELAY RTD 1 AU[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 Fig. 24. T racing the auto fan circuit. Fig. 25. T raci ng t he fan on cir cu it. M5846 L1 (HOT) L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR CHANGEOVER VALVE EM. HT. RELAY RTD 1 AUX. HT. LED (GREEN) EM. H[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 21 60-2485 — 8 OPERATION Heat Anticipation/Cool Anticipation When co ntrollin g a heatin g unit with a thermostat, the temperat ure does not r emain ex actl y at the thermosta t setpoin t, but vari es within a certain t emperature ran g e. Heat anticip ation is added to the therm ostat to reduce this[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 2 CAUTION Equipment Da mage Hazard . Due to calibrati on techni q ues us ed for T8 74 Thermos tats with outd oor rese t, the C815 A Thermisto r must be wired into the s y stem at a ll times . Failure t o do so will result i n seriou s de g radation of performan ce. Service and Replacement[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 23 60-2485 — 8 Fig. 31. Sys tem switch ing for automatic c hangeover . Automati c chan g eover is fre q uentl y used in areas where there are la r g e tempe rature d ifferen ces in 24 hours . Some us es for the auto matic chan g eover feature are in the sou thern stat es ( cool in the morni n g and h[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 4 one con trollin g the a uxiliar y heat ) makes o nl y when th e heat pump al one cann ot hand le the lo ad. Tha t is how the strate gy of usi n g the mos t econom ical hea t first i s imple mented. Cycling Rate Normall y , the rmostat an ticipation is set to c y cle a fos sil fuel furna[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 25 60-2485 — 8 Low Temperatur e Lock outs Some ma nufactu rers of he at pump s have pre viousl y cont rolle d their units so the compr essor was lock ed out be low a speci fied outdoo r tem peratur e. This was d one becaus e of th e str ess plac ed on the compr esso r b y the ver y cold te mper ature[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 6 Defrost Control In some re g ions, durin g half or more of th e heatin g season, the outd oor coil op erates be low 32 ° F ( 0 ° C ) Frost or ic e bui lds up on th e outdo or coil of a heat pump si milarl y to the fro st buildup in a household refri g erator . Eventuall y , this accum[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 27 60-2485 — 8 Fig. 39. Auxiliary heat in two-s tage ther mostat. This me thod ke eps the aux iliar y heat of f until the heati n g load is l ar g e enou g h to demand 10 0 percent heat pump op eration . That dem and is me asured b y the thermos tat and is the act ual heat re q uireme nt of the space[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 8 the ther mostat. A se t of conta cts on the emer g enc y heat rela y is used to b y pass eac h outdoo r thermo stat s o that all electric heat is under imm ediate th ermostat sta g e-two contr ol. So the emer g enc y heat rela y simpl y b y passes the outdo or thermostats . See Fi g . 4[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 29 60-2485 — 8 CROSS REFERENCE The f ollowin g sectio n list s the curre nt T874 T rade repla c e- ments for T872 and T87 4 Multista g e Thermos tats. It also li sts the Q67 4 T rade replacem ents for Q 672 and Q 674 Subba ses. All therm ostats li sted carr y the Ho ne y well lo g o unless other wise[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 83 0 A1279 General Elec tric lo g o; no. A Y28X1 14A; 75 ° F stop ; lockin g cover ; no thermo meter . T874A10 1 0 Use T874A1 176 for Dept. of Defe nse ( DoD ) applic ation. A1287 General Elec tric; no. A Y28X097 A; fan curre nt shunt for auto fan in heatin g ; hea t an tic ipa tor s e t at[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 31 60-2485 — 8 C1 103 Amana l o g o; anticip ator set a t 1.2A T 874C101 8 C 1111 A i r t e m p ( Chr y sler ) lo g o T874 C1018 C1 129 Da y and Ni g ht lo g o; no. 0. 1-0.174 T874C 1018 C1 137 Fas t c y cle perf ormance o n both hea t sta g es T874 C1018 Ad j ust anti cipator faster for correct perf[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 83 2 C1509 Fedders lo g o; used with Q6 72L1 102 Y594 R1425 Wirin g dif feren ces ( old=ne w ) : C=X, K=E; remove Y-W1 j umper . C15 17 Cli matr ol lo g o; used with Q 672L1 102 Y594 R1425 Wirin g dif feren ces ( old=ne w ) : C=X, K=E; remove Y-W1 j umper . C15 25 S q uare D l o g o; no. HCD[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 33 60-2485 — 8 D1 14 4 C arri er l o g o; no. HH07A T072 T874D1 165 D1 15 1 G ene ral E lect ric l o g o; no. A Y28X098; 0.4 hea t anticipat or settin g T874 D1 165 D1 169 Airte mp ( Chr y sler ) lo g o; used with Q672 E1 1 18 T874 D1 165/ Q674E1 049 Wiri n g differ ences ( old=ne w ) : A=W1; set H1 [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 83 4 E1036 American St andard lo g o T874E10 1 6 E1044 Y ork lo g o; lo ckin g cover T874E10 16 E1051 ITT lo g o T874E10 1 6 E10 69 C li matr ol lo g o T874E10 1 6 E1077 Airtemp ( Chr y sler ) lo g o T874E10 1 6 E1085 Lennox lo g o T874E10 1 6 E1093 T rane lo g o T874E10 1 6 E1 101 Dunham-Bu[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 35 60-2485 — 8 G1026 Lennox lo g o; fast c y cle per formance; sta g e 2 heat; fixed antici pator sta g e 1 heat an d cool; chan g eover with c oolin g ; used with Q672 E101 9, F1067. None See subbas e descripti on for repla cem ent in form ati on. G1034 W estin g house lo g o; ad j ustable an ticipa[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 83 6 G1208 Marvair lo g o; spec ial for Cris paire; use d with Q672F 1 166, F13 23. Y 594G1393 G12 16 Janit rol lo g o; no. 2 6G05; sta g e 2 heat anticipator set at 1.2A; used with Q6 72F1 1 17. Y594 G1252 Wiri n g differ ences ( old=ne w ) : C=X. G1224 TRADELINE; ad j ustable a nticipato r[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 37 60-2485 — 8 N1010 Willia mson lo g o; ad j ustable a nticipato r sta g e 1 and 2 heat ; fixed anticipa tor sta g e 1 cool ; used with Q6 72F1 133 or F131 5. T874 N1016/ Q674F 1220 N1028 TRADELIN E heat mode ch an g eover; used with Q672F 1216. T874 N1016 N1036 Bard; used with Q6 72F129 9. T 874N10[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 83 8 R1 12 3 Y ork lo g o; no. 025 -21453C; Cels ius sca le. Y594 R1664 R1 131 Lennox l o g o; sepa rate auxiliar y heat power circu i t; fast c y cle s ta g e 2 heat a n ticipat or; outdoor reset; used wi th Q672L 1 144, C 815A1013. None R1 14 9 West in g house lo g o; ad j ustabl e sta g e[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 39 60-2485 — 8 T able 7. Q672-Q6 74 Subbase Cro ss Reference. Model Num ber Description Q674 T rade Replac ement a Re marks Q672A S y stem: HEA T-AUTO-COOL , Fan: AUT O-ON A1005 Standard OEM Q674A1 019 A1013 TRADELINE Q674A1019 A1021 R C-RH j umper Q6 74A1019 RC-R H j umper re q uired . A1039 RC-RH j[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 0 B1269 Whalen; Hi-Lo fan s witch; constant fan in heat and co ol s y st em swi tch p osi tio ns; used with T872C157 4. None B1277 S q uare D n o. HCB-5. Q674B1 034 B1285 W ards; RC-RH and F -W3 j umpers; us ed with T872C167 3. Gas Fu rnac e: T874 C1018/ Q674B1 034 Electric Furnace: T874 [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 41 60-2485 — 8 E1050 TRADE LINE Q674E1 049 E1068 R C-RH j umper; us ed with T87 2C1699. Q674E1 049 RC-RH j umper re q uired . E1076 RC-RH inte rnal j umper; EM. HT. LED. Q674E1049 RC-RH j umper re q uired . E1084 Carrier no. HH93AZ076; RC-RH j umper . Q6 74E1049 RC-RH j umper re q uired . E1092 Carri[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 2 F1 125 BDP no. 3442DP9 0; used wit h T872G1 1 17, G1 166, G1 174. Y 594G1252 Wiri n g differ ences ( old=ne w ) : C=X. F1 133 Wil liamson ; heat pum p; EM. HT . LED; he at mode cha n g eover ; comp ress or lo ckout in EM. HT .; used with T872N1010. T874 N1016/ Q674F 1220 F1 141 Westin g[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 43 60-2485 — 8 G1074 Sin g er no. 0200 5754; X1 and X2 ter minals f or field-adde d indi cator li g hts; us ed with T872D137 5. None G1082 Sin g er no. 0200 5792; X1 and X2 ter minals f or field-adde d indi cator li g hts; us ed with T872D137 5. None G1090 TRADELINE; B and O terminals. Q674G1070 Q672[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 4 L1052 Carrier no. H H93AZ075; h eat pump; EM. H T . LED; cool mode ch an g eover ; comp resso r lockout in EM . HT .; used with T872G 1075, G1 182, G1273, G13 07. Y594 R1615 W irin g differ ences ( old=ne w ) : C=X. L1060 Dunham Bush; EM . HT . LED; used with T872R109 9. Y594 R1243 L107[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 45 60-2485 — 8 L1342 Lennox no . 52C7601; used with T872 W1019 and C815 A1013. None L1375 W estin g house; used wi th T872R 1271, W89 . None L1383 Dunham Bus h; used w ith T872R1 099. Y594R1243 L1391 Williams on; used with T87 2R1339. Y594 R1243 L1409 Duotherm sp ecial; u sed with T8 72R1321 , W89. N[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 6 T able 8. T874 C ross Re ference. Model Number Fig. No. Descr iption T rade Model Replacem ent Remarks T874A 1-sta g e heat, 1-sta g e cool . A1002 4 4, 65 Hone y well lo g o; Stand ard OEM; used w ith Q674 B1331. T874A103 6 A1010 44 H one y well lo g o; incl udes Allen wre nch and s cr[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 47 60-2485 — 8 A1200 51, 53 Obsolete . Carrier lo g o; pa rt no. H H07A T 164 ; ° C scalepla te; inc ludes Al len wren ch and sc rews to lock cover; used w ith Q674B. T874A1036 a Set sta g e 1 heat anticipa tor for total curre nt draw o f fan and sta g e 1 heat primar y ; replacem ent has ° F scale[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 84 8 A1481 44 Ob solete . Hone y well lo g o; Carri er part no. HH6 21602; includes lock in g cover a nd non-ad j ustable ra n g e stops set at 72 ° F ( max. hea t ) and 78 ° F ( min. coo l ) . T874 A10 36 A1507 44 Ob solete . Cl imat e-T el l o g o; inclu des Allen wrench and screws to lo[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 49 60-2485 — 8 B1 13 4 22 2 Obs ole te . Carrier S y ner gy 2000 lo g o; part no. HH07A T199; ° C scalepla te; us ed with Q6 74E1395 ( HH 93AZ 209 ) . T874B10 19/ Q674E 1049 a Wirin g diff erences ( old=new ) : W1=W; RC-RH j umper re q uired; r eplaceme nt has no LEDs. T874C 2-sta g e heat, 1-sta g [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 85 0 C12 16 44 O bsol ete . Fasco part no. 1230-81 97. T874C1 018 C1224 105 Obso lete . S q uare D lo g o. T874C1 018 C1240 44 Hone y well lo g o; Hone y well Canada T RADELINE model; ° C scalepla te; includes Allen wrench and screws to lock cover . T874C1 018 Replacement has ° F scalepl a[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 51 60-2485 — 8 C1489 121 Obso lete . Hon e y well lo g o; non-ad j ustable ran g e stop s set at 75 ° F ( max. hea t and min. cool ) ( 24 ° C ) ; used with Q674L 1 157. Y594C1 322 a C1497 121 Obso lete . Hon e y well lo g o; me ets DoD spe c ificati ons; us ed wit h Q674 L1 15 7. Y594C1 322 a C15 1[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 85 2 C18 77 53 O bsol ete . Hone y well lo g o; TRADELIN E model ; used wit h Q67 4B 1554; use d in Y 594 C142 1. Y5 94D1347 Ju mper RC-RH; s y stem switch : OFF-HEA T-AUTO - COOL T874D 2-sta g e heat, 2-sta g e cool . D1009 166, 82 Obso lete . Hone y well lo g o; used with Q6 74F133 7, E100[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 53 60-2485 — 8 D12 15 44 O bsol ete . Friedrich C limate Mas ter lo g o; part no. A T5415; ° F/ ° C sc aleplate . T874D1 165 Replacement has ° F scalepl ate. D12 23 44 Hone y well lo g o; Hone y well Canada T RADELINE model; Celsiu s scale. T 874D1 165 Replacement has ° F scalepl ate. D12 31 44 O[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 85 4 D14 70 44 O bsol ete . Y ork lo g o; part n o. 2TH04701624 A; include s All en wrench and sc rews to loc k cover ; ° C scaleplate. T 874D1 165 Replacement has ° F scalepl ate. D14 88 44 O bsol ete . Risco spec ial. T874D 1 165 D14 96 44 O bsol ete . Bor g W arner multi- lo g o; pa rt [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 55 60-2485 — 8 D1801 45, 208 T rol-A-T emp b y Hone y well lo g o; H1 and H2 anticipa tors set at 0.10 A; used with Q674 B1463, D 1 1 15. None S ee Trol-A -T em p for replacem ent. D1819 44 Marv Air Com Stat lo g o; par t no. 50059 ; ad j ustab le intersta g e betw een H1 and H2 and between C1 an d C[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 85 6 D20 56 44 O bsol ete . ComStat lo g o; part no . 50056; ° F/ ° C scalepl ate; ad j ustable inte rsta g e on bot h heatin g and cooli n g ; includes lockin g cover a nd field-a d j ustab le lockin g levers. T874 D1 165 Replac ement ha s ° F scalepl ate an d 2 ° F fixe d dif ferent ia[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 57 60-2485 — 8 E1081 44 T rane lo g o; part no. BA Y28X186; ° F/ ° C s calepla te. T874E1016 Replac ement ha s ° F scalepl ate. E1099 44 O bsolete . Lenn ox lo g o; par t no. 13F1 001; ° C scalepl ate. T874E1016 Replacement has ° F scalepl ate. E1 10 7 44 H on e y well lo g o; ° C sca lepla te.[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 85 8 G10 14 86, 15 0 O bsol ete . Lennox lo g o; part no. 24F580 1; ° F/ ° C scalepl ate; H2 antic ipator fac tor y set at 0 .25A for fas t c y cle perfor mance; chan g eove r in co olin g mode; independe nt heatin g and coo lin g circuit s; used with Q674E1 148, F1 1 13. Y594G12 52 a Wiri[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 59 60-2485 — 8 G1204 162 Hone y well lo g o; d esi g ned for use on T rane heat pump s; no H2 an ticipatio n; chan g eover in coo lin g mode; us ed with Q674J 1043 and C815A10 05; used in Y594G1 161. Y594 G1 161 a Desi g ned for u se on T rane heat pum ps. G1212 155 Obso lete . Hone y well lo g o; H2[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 0 G1444 160 Obso lete . ROCA lo g o; ° C sc aleplate ; used with Q674J10 27. Y594G15 67 a Replac ement ha s ° F scalepl ate. G1451 155 Obso lete . BDP multi-lo g o; par t no. HH6 41502; us ed with Q674F 1212; use d in Y594G 1245. T8 74G124 6 a or V594G12 52 a G1469 194 Obso lete . No lo[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 61 60-2485 — 8 G1659 177 Obso lete . Mamm oth lo g o; 0. 8A ma ximum cu rre nt throu g h B or O ter min al; 12 ° F differ ential between H1 and H2 for ni g ht setback ; used with Q674C1 330; used i n Y594G1427 . Y594H1 012 a Wirin g diff erences ( old=new ) : R2=L, R1=none; L-R j umpe r re q uired; [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 2 G1873 160 Obso lete . Hone y well lo g o; TRADELINE mo del; Premier White ® color; de si g ned to re place Y594G1013 ( Yo r k part no. 2TH1 1702424 ) , Y594G12 29 ( Y ork part no . 6TH1 1702424 ) , and Y ork part no. 2TH1 1770 4124 ) ; used with Q674J 1225; used in Y594 G1575 . Y594G15[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 63 60-2485 — 8 H10 21 74 O bsol ete . Friedrich C limate Mas ter lo g o; part no. A T5821; ° F/ ° C sc aleplate ; used with Q674 C 1041. Y594H1012 a Wirin g diff erences ( old=new ) : Y1=O, Y2=Y ; L-R j umpe r re q uired; r eplaceme nt has ° F scalepl ate. H10 39 79 O bsol ete . Ma mmot h lo g o; [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 4 J1069 124, 144, 206, 207 Obso lete . Hone y well lo g o; TRADELIN E model ; used with Q674J 1282; used in Y594 J1019. T851 1G1021 J1077 124, 171 Obso lete . Nord y ne lo g o; part n o. 9148 300; ° F/ ° C scalepl ate. T851 1G1021 T874K Heat pum p model; 2-st a g e heat, 1-sta g e cool,[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 65 60-2485 — 8 N1040 179 Obso lete . Ho ne y well lo g o; H1 and C1 ant icip atio n fi xed; used wi th Q674F1 261; used in Y594N10 15. None N1057 178 Obso lete . In tertherm lo g o; part no . 91 1 1882; us ed with Q67 4F12 20; used in Y5 94N 102 3. T874N1016 N1065 178 Obso lete . M iller lo g o; Nord[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 6 R1079 123 Obso lete . Ruu d lo g o; par t no . UXMT -C70 ; us ed wi th Q674L 1 157. Y594R1 243 a R1087 120 Obso lete . Hon e y well lo g o; Specia l for Dun ham Bush ; use wit h Q674L. Y594R1 664 a R1095 123 Obso lete . Rhe e m lo g o; par t no. RXMT -C70; used with Q674L 1 157. T874R1 [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 67 60-2485 — 8 R1319 191 Obso lete . Car rier part no. 42QH40 0083; used with Q674B1281 on two speed fan appli cations. See OEM for replacem ent. R1327 120 Obso lete . Bo r g -W arner multi-lo g o; pa rt no. 6TH1 1702224A ; used w ith Q674L 1272; us ed in Y594R1 193. Y594R1 672 a R1335 106 Obso lete [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 86 8 R1574 132 Obso lete . Comfort mak er lo g o; par t no. 15057 39; us ed with Q674L 1538; used in Y594R1 383. Y594R1243 a Wirin g diff erences ( old=new ) : C=X, X=L, W=W2 . R1582 132 Obso lete . Arc oaire lo g o; part no. 150739; us ed with Q674L153 8; used in Y594R 1391. Y594R1243 a Wi [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 69 60-2485 — 8 R1889 120 Hone y well lo g o; des i g ned to rep l ace Y594 R1 151 ( Yo r k part no. 2TH1 1702324 ) , Y594R1 193 ( Y ork part no. 6TH1 1702224 ) , and Y ork part no. 2TH1 17040 24; used with Q6 74L1736 a nd C815 A1054; use d in Y594R 1672. Y594R1 672 a R1897 230 Hone y well lo g o; Pr [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 87 0 T874W 3-sta g e heat, 2-sta g e cool , manual chan g eover . W1007 1 18 Obsolete . Hone y well lo g o; W estin g house sp ecial; used with Q674L 1256. T861 1M2025 ( pro g rammabl e ) Includes ni g ht set bac k. W1015 54 Hone y well lo g o; used with Q674 B1216 and C81 5A1005; used in Y5[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 71 60-2485 — 8 T able 9. Q674 Subbase Cross Reference. Model Number Fig. No. Descripti on Q674 T rade Replac ement Re marks Q674A S y stem: HEA T-AUTO-COOL; Fan: AUTO-ON A1001 7 1 Standard O EM. Q674A10 19 A1019 71 TRADELINE ® model; used with T 874A-D. Q674A10 19 A10 35 71 Obsolete . Tran e par t n[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 87 2 B1240 234 Obsolete . Northrup heat p ump; AUX H EA T LED; u sed wit h T8 74G1 139. Y594G125 2 a Wir in g differ ences ( old=ne w ) : Y1=Y2, W1 =W2; EM HT s y stem switch pos ition is not opera ti onal . B1257 56 Obsolete . LSI-Mammot h; RESET LED; automatic fan operation i n heat and co[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 73 60-2485 — 8 B1554 82 Obsolete . TRADEL INE; includ es LOCK OUT LED a nd removabl e j umpers between RC and RH termina ls; us ed wit h T8 74C1 877 ; us ed in Y594 C142 1. Y594D1347 Jumper RH-RC; s y stem switch: O ff-HEA T-AUTO- COOL. B1562 45 Obsolete . Amana lo g o; part no . P1217701F; removabl [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 87 4 C12 07 78 O bsol et e . Fried rich; S y stem: OVERRIDE-AUTO-OFF; used wi th T874P101 4. T8600D2 028 ( pro g rammable ) Wiri n g differ ences ( old=ne w ) : L=R, W= O; W -Y j umper re q uire d; n i g ht set bac k. C12 15 97 O bsol et e . Fried rich part n o. AQ5315; S y stem: OVERRIDE-AU[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 75 60-2485 — 8 C13 89 205, 176 Obso lete . Command Aire part no . P1 099- 00 21; two LEDs; used with T87 4G-H. None See thermostat des cription fo r repla cem ent in form ati on. C13 97 205, 171 Obso lete . Com mand A ire pa rt no . P109 9-00 23; used with T874G-H. None See thermostat des cription fo[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 87 6 D10 65 63 O bsol et e . Incl udes t wo LEDs; u sed with T8 74F1 122. T874F101 5/ Q674D 1040 a Repl acem ent has no L EDs. D1099 55, 66 Obs ole te . T rane part no. BAS-0430; used with T874A-F . Q67 4D1 040 D1 10 7 55, 66 O bsol et e . Sn y der Gene ral part no s. 654 958801/ 1520503/ 4 [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 77 60-2485 — 8 E1262 82 Lennox pa rt no. 13F1 701. Q 674E1049 E1270 198 Obsolete . Carrier part no. HH93AZ 189; used with T874L1000 ( HH07A T176 ) . Y594G141 9 a E-W2 j umper re q uired . E1304 82 Obsolete . BDP part no. P272-1887; u sed with T874L1026 . Y594G1419 a E-W2 j umper re q uired . E1312 22[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 87 8 F1089 152 Obsolete . Includes EM HEA T LED; X2-E and RC-RH j umpers. Q 674F1022 F1097 142 Obsolete . Southwest speci al; W2-X2 j umper . Q674F10 22 F1 105 145 Obsolete . Lennox hea t pump; EM HEA T LED; us ed wit h T8 74G1 154. Y594G125 2 a Wir in g differ ences ( old=ne w ) : V=R, Y=W2[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 79 60-2485 — 8 F1345 194 Obsolete . Addison heat pu mp; EM HEA T and CHECK LEDs; used w ith T87 4G; used in Y594G . Y594G125 2 a Wir in g differ ences ( old=ne w ) : Y1=O, C=X, W1= Y , X=L. F1360 167 Obsolete . Rheem part no. 41 -20797-17; AUX HEA T and EM HEA T LEDs; used with T874G149 3. Y59 4G1526[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 0 F1667 155 Wate rFurnace lo g o; part no . T A21H03; S y stem: OFF- AUTO-H EA T-EM HT ; includes two LE Ds; used with T874G204 6. Y594 G1716 F1675 248 Obsolete . WaterFu rnace lo g o; par t n o. T A21 H03; includes four LEDs . See OEM for replacem ent. Q674G S y stem: OFF-AU TO ; Fan: No[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 81 60-2485 — 8 J1068 144 Obsolete . Carrier heat pu mp; part no . HH93AZ18 3; used wi th T874J1 002 ( HH07A T175 ) or T874J1028 ( HH07A T165 ) . Y594J1019 J1076 180 Obsolete . McQua y part no. 0 2005964; t wo LEDs; used with T874A,D. Q674F10 22 Re placeme nt has no LEDs. J1084 171 Obsolete . BDP heat[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 2 Q674K S y stem: OFF-HEA T-AUTO-COOL; Fan: None K1000 93 Obsolete . Carrier part no. HH93 AZ172; RC-RH j umper . Q 674E1049 Fan switch is not op eration al. K1018 95 Obsolete . Oneida Heater p art no. 304 0284-02; S y stem: OFF-W OOD-WOOD /OIL-OIL; us ed with T874F1 106. Q674K10 26 K1026[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 83 60-2485 — 8 L1 181 1 13 Used w ith T874R1 129; u sed in Y594R . Y594 R1 243 a Wi rin g differ ences ( old=ne w ) : X1=X. L1 199 1 14 Obsolete . Lennox no. 24F6001; used w ith T874 D1207 and C815 A1013. T861 1M2025 ( pro g rammable ) Wiri n g differ ences ( old=ne w ) : V-VR=R, Y=W3, X= C, R=O, M=Y[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 4 L1397 103 Obsolete . Carrier part no. HH93AZ185 A; SUPL HEA T LED. Y594G139 3 a Wirin g differ ences ( old=ne w ) : C=X. L1405 106 Obsolete . BDP heat pump; part no. HH 641501; u sed with T874R133 5; used in Y594R1201 . Y594 R1 243 a L1413 133 Obsolete . Fedders hea t pump; us ed with T[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 85 60-2485 — 8 L1637 207 Obsolete . Carrier heat pu mp; part no . HH93AZ195; used wi th T874J1 002 ( HH07A T175 ) or T874J1010 ( HH07A T165 ) . Y594J1001 a L1678 209 T rol-A-T emp b y Hone y well; g ra y color; us ed with T874R170 7; used i n Y594R1 490. None See T rol-A-T emp. L1686 209 T rol-A-T em[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 6 L1850 120 Y ork Canada; g ra y color; i ncludes one LED; used with T874R197 0; used i n Y594R1 789. Y 594 R167 2 a L1868 125 TRADELINE; inclu des two LEDs; used with T874R198 8; used i n Y594R1 797; direc t replace ment for Evcon /Col ema n Y594 R1 235 ( T874 R1 368/ Q674L 1421 ) Colem [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 87 60-2485 — 8 T able 10. Y594 Cross Re ference. Model Number Fig. No. Descripti on T rade M odel Replac ement a Re marks Y594A A1001 46 O bsolete . Amana part no. D6 8535-1 1; contai ns T874A1077, Q6 74B1075. T874A 1036 / Q674B10 75 A1019 82 O bsolete . Amana part no. P6 8535-12; c ontains T874A1077[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 88 8 C13 48 70 O bsol et e . Fiber g las; cont ains T874C16 53, Q674S1 000. T874 C1000/ Q674B10 75 Wir in g differ ences ( old=ne w ) : Y=Y1; j umper RC -RH and Y1- W1; r eplaceme nt has no SER VICE LED; rep lacemen t has fa n swit chi n g and HEA T- OFF-COOL s y stem swit chin g . C13 55 45[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 89 60-2485 — 8 D1347 82 T RADELINE ® contain s T874D194 2, Q674E1403. Y594D1347 D1354 82 SUPER TRADELINE ® cont ains T87 4D2031 ( no cover ) , Q674 E1049, and TG504A w ith two ke y s. Y594 D135 4 D13 70 45 O bsol et e . Ca rrier part n o. 50QE90 022101; contai ns T874D204 9 and Q6 74B1539. T874 D1 [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 89 0 G1294 79 Obsolete . LSI; cont ains T874G1378 , Q674C 1 124. See OEM fo r replacem ent. H2 is ni g ht se tback. G1328 194 Ob solete . Addison part no . 8403-197; conta ins T874G154 3, Q674F1 345. Y594G125 2 Wir in g differ ences ( old=ne w ) : Y1=O, X=L, C=X. G1344 194 Ob solete . Heat C[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 91 60-2485 — 8 G1617 73 Obsolete . Carrier part no. 5 0QE90020 101; con tains T874G194 9 and Q6 74C1504 . Y594 H101 2 a Wi rin g differ ences ( old=ne w ) : Y1=O, Y2 =Y , L=R, R=no ne; R-L j umpe r re q uired; no ni g ht set back. T8600D2 028 ( pro g rammable ) Wiri n g difference s ( old=ne w ) : Y1[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 89 2 J1019 244 Obsolete . TRADELINE; automat ic chan g eover; contai ns T874J 1069 and Q674J 1282; dire ct replacem ent for T874 J1002 or T874J1 028 used with Q674J 1068 or Q674J1 159 ( HH07A T175 o r HH 07A T1 65 us ed wi th HH 93A Z183 or HH 93AZ 196 ) . ( Recontrol ) T851 1G1021 Y594N N10[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 93 60-2485 — 8 R1292 108 Contains T8 74R1467 and Q67 4L1512; re places Y594R1 1 10 ( T874 R1 137/Q674L 1 132 ) . Y594 R129 2 R1300 123 Contains T8 74R1475 and Q67 4L1520. Y594R1300 R1318 130 Obso lete . Comfo rtmaker p art no. 1 505721 ; contain s T874R148 3, Q674L153 8 and C815A100 5. Y 594 R176 3 W[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 89 4 R1615 230 TRADELINE; contai ns T874R1822 and Q674L171 0; replaces Y594R1326 ( T874 R1491/ Q674L 1553 ) . Y594 R161 5 R1623 134 Obso lete . Rheem Universal Parts p art no. 41- 20796-46; c ontai ns T874R15 58 and Q674L15 04. Y594 R130 0 R1631 134 Rheem p art no. 41-2 0796-29; c ontain s T[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 95 60-2485 — 8 R1797 125 TRADELINE; contai ns T874R1988 and Q674L186 8; direct replac ement for Y594R1 235 ( T874R13 68/Q674L 1421 ) Evcon/Co leman part no. 3600-368 ) . Y594 R179 7 a R1805 245 Obso lete . Amana pa rt no. 1 0636702; c ontains T874R200 2 and Q6 74L1876. Y594R1 797 Wi rin g differ ence[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 89 6 WIRING DIAGRAMS Fig. 44. Sch ematic and hookup of T874A,B,C,D,E,F w ith Q674B. Used in standard applicatio ns. Fig. 45. S chematic an d hookup of T874C,D wi th Q674B. Used in standard app lications. H1 FALL L1 (HOT) L2 1 RH W1 W2 O G Y2 Y1 RC HEAT RELAY 2 HEAT RELAY 1 HEAT OFF COOL SYST[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 97 60-2485 — 8 Fig. 46. Sch ematic and h ookup of T874A,B,D with Q6 74B. Used in s tandard applic ations. . Fig. 47. Sc hematic and hookup of T874R with Q6 74B. Used in heat pum p application s. H1 FALL W1 W2 O G Y2 Y1 HEAT RELAY 2 HEAT RELAY 1 HEAT OFF COOL SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATO[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 89 8 Fig. 48. Sch ematic and hookup o f T874D with Q674B. Used in standard a pplications. H1 FALL W1 G W2 B RH X1 O FAN RELAY HEAT RELAY 1 HEAT OFF COOL SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITCH 2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 99 60-2485 — 8 Fig. 49. Sch ematic and hookup o f T874C with Q674B. Used in standard a pplications. Fig. 50. Sc hematic and hookup of T874G with Q674B. Used in heat pump applications. L1 (HOT) L2 1 H1 FALL H2 FALL C1 RISE L1 (HOT) L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 0 Fig. 51. Sch ematic and hookup o f T874D with Q674B. Used in standard a pplications. Fig. 52. Sch ematic and hookup o f T874C with Q674B. Used in standard a pplications. C2 RISE L1 (HOT) L2 1 L1 (HOT) L2 1 3 3 C1 RISE H2 FALL H1 FALL M5944 H1 ANTICIPATOR H2 ANTICIPATOR C1 ANTICIPATOR [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 101 60-2485 — 8 Fig. 53. Sch ematic and hookup o f T874D with Q674B. Used in standard a pplications. Fig. 54. Sc hematic and hookup of T8 74W with Q 674B. Used i n standard app lications. H1 FALL W1 W2 G Y2 Y1 HEAT RELAY 2 HEAT RELAY 1 H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITCH 1 POWER SUPPLY. [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 2 Fig. 55. Sche matic and hookup of T874A,D,F with Q674D. Use d in standard a pplicati ons. Fig. 56. Sch ematic and hookup o f T874C with Q674B. Used in standard a pplications. M3667A POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. JUMPER RC, RH FOR SINGLE TR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 103 60-2485 — 8 Fig. 57. Sc hematic and hookup o f T874P with Q674B. Used in heat pump application s . Fig. 58. Sc hematic and hookup of T874G with Q 674D. Used in standard application s. H2 FALL H1 RISE CO L1 (HOT) L2 1 C1 RISE 2 1 2 POWERSUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS R[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 4 Fig. 59. Sc hematic and hookup of T874A with Q674Q. Used in fan coil applicatio ns. Fig. 60. Sche matic a nd hookup of T874C with Q67 4N. Used in ev aporative cooler appli cations. L1 (HOT) L2 1 K2 RELAY SYSTEM SWITCH ON HIGH H1 ANTICIPATOR H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT M[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 105 60-2485 — 8 Fig. 61. Sche matic a nd hookup of T874C with Q67 4N. Used in ev aporative cooler appli cations. Fig. 62. Sche matic a nd hookup of T874F with Q674B. Used in wood/co al appli cations. L1 (HOT) L2 EVAPORATOR RELAY ELEC. HT. RELAY FAN RELAY COMPRESSOR CONTACTOR CHANGEOVER RELAY O Y2 W2 [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 6 Fig. 63. Sch e matic and h ookup of T874F with Q674D. Used in wood/co al applicati ons. Fig. 64. Sc hematic and hookup of T874A with Q674Q. Used in fan coil applicatio ns. L1 (HOT) L2 1 NO SYSTEM SWITCH H2 ANTICIPATOR H1 H2 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 107 60-2485 — 8 Fig. 65. Sch ematic and hookup o f T874A with Q674B. Used in standard a pplications. Fig. 66. Sche matic and hookup of T874A,D,F with Q674D. Use d in standard a pplicati ons. C1 RISE L1 (HOT) L2 1 L1 (HOT) L2 1 H1 FALL POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 0 8 Fig. 67. Sc hematic and hookup of T874R with Q674B. Used in heat pum p applic ations. Fig. 68. Sc hematic and hookup o f T874P with Q674B. Used in heat pump application s. M5998 H2 FALL H1 FALL C1 L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 109 60-2485 — 8 Fig. 69. Sch ematic and h ookup of T874V with Q674R. Used in fan coil a pplications. Fig. 70. Sc hematic and hookup o f T874C with Q674S. Used in heat pum p application s. C1 RISE L1 (HOT) L2 1 M107A FAN SWITCH LO AUTO HI CONT. SYSTEM SWITCH OFF COOL C1 ANTICIPATOR POWER SUPPLY. PROVI[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 1 0 Fig. 71. Schematic an d hookup of T874A-D wi th Q674A. Used in standard app lications . Fig. 72. Sche matic and hookup of T 874D,E,F with Q674C. Use d in stan dard applicati ons. H1 FALL L1 (HOT) L2 1 RH W1 W2 G Y2 Y1 RC HEAT RELAY 2 HEAT RELAY 1 HEAT AUTO COOL SYSTEM SWITCH H1 ANTICI[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 1 1 60-2485 — 8 Fig. 73. Sc hematic and hookup of T874G with Q674C. Used in heat pump applications. Fig. 74. Sc hematic and hookup of T874H with Q6 74C. Used in heat pum p application s. H1 FALL G Y1 R FAN RELAY REVERSING VALVE RELAY OFF AUTO SYSTEM SWITCH H ANTICIPATOR C ANTICIPATOR AUTO ON FAN SW[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 1 2 Fig. 75. Sch ematic and hookup o f T874A with Q674C. Used in standard a pplications. Fig. 76. Schematic an d hookup of T874A-D wi th Q674C. Used in standard app lications . C1 RISE L1 (HOT) L2 1 3 H1 FALL 2 THERMOSTAT SUBBASE SYSTEM COMPONENTS SYSTEM SWITCH OFF AUTO FAN SWITCH AUTO ON[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 13 60-2485 — 8 Fig. 77. Sc hematic and hookup of T874K with Q6 74C. Used in heat pum p application s. Fig. 78. Sc hematic and hookup o f T874P with Q674C. Used in heat pump application s . C1 RISE H1 H2 CO FALL FALL FALL L1 (HOT) L2 1 1 2 L1 (HOT) L2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND O[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 1 4 Fig. 79. Sche matic an d hookup of T 874G,H with Q674C. Use d in standard applications. Fig. 80. Sch ematic and hookup of T874D with Q674E. Used in standard a pplications. O 1 THERMOSTAT SUBBASE SYSTEM COMPONENTS R1 G R2 H1 ANTICIPATOR CO RISE H1 FALL FALL H2 C1 C1 ANTICIPATOR POWER S[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 15 60-2485 — 8 Fig. 81. Sc hematic and hookup of T874C with Q6 74C. Used in heat pum p application s. Fig. 82. Sch ematic and h ookup of T874A,C,D with Q674E. Used in s tandard a pplications. H1 FALL L1 (HOT) L2 1 H2 ANTICIPATOR OFF AUTO FAN SWITCH CHANGEOVER RELAY M5981 POWER SUPPLY. PROVIDE DISCO[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 1 6 Fig. 83. Sc hematic and hookup o f T874G with Q 674C. Used in standard ap plications. Fig. 84. Sc hematic and hookup of T874G with Q674E. Used in heat pum p applications. H1 FAN SWITCH ON AUTO CHECK LED (RED) M5982 POWER SUPPLY. PROVIDE DISCONECT MEANS AND OVERLOAD PROTECTION AS REQUI[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 17 60-2485 — 8 Fig. 85. S c hematic an d hookup of T8 74A-D with Q674E. Use d in standard applicat ions. Fig. 86. Sc hematic and hookup of T874G with Q674E. Used in heat pum p applications. H1 FALL 4 H1 ANTICIPATOR W2 HEAT RELAY 2 L1 (HOT) L2 1 COMPRESSOR CONTACTOR 1 M5983 POWER SUPPLY. PROVIDE DIS[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 1 8 Fig. 87. Sch ematic and hookup of T874D with Q674E. Used in standard a pplications. Fig. 88. Sc hematic an d hookup of T8 74B,D wi th Q674E. Used i n standard app lications. C2 RISE C1 RISE H2 FALL H1 FALL L1 (HOT) L2 1 L1 (HOT) L2 1 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OV[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 1 19 60-2485 — 8 Fig. 89. Sch ematic and hookup of T874D with Q674E. Used in standard a pplications. Fig. 90. Sc hematic and hookup of T874D with Q674G. Used in standa rd application s. Y1 W1 RC 1 M7023 THERMOSTAT SUBBASE SYSTEM COMPONENTS B Y2 G W2 RH X H1 ANTICIPATOR H2 ANTICIPATOR C1 RISE H1 FALL [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 0 Fig. 91. Sch e matic and h ookup of T874A-F ,Q with Q674 G. Used in st andard appli cations. Fig. 92. Sc hematic and hookup of T874C with Q674G. Used in heat pump applications. H1 FALL L1 (HOT) L2 1 RH W1 W2 O Y2 Y1 RC HEAT RELAY 2 HEAT RELAY 1 OFF AUTO SYSTEM SWITCH H1 ANTICIPATOR C1[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 121 60-2485 — 8 Fig. 93. Sch ematic and hookup o f T874D with Q674K. Used in standard a pplications. Fig. 94. Sc hematic and hookup of T874D with Q674G. Used in standa rd application s. H1 FALL H2 FALL C1 RISE C2 RISE L1 (HOT) L2 L1 (HOT) L2 1 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD P[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 2 Fig. 95. Sche matic a nd hookup of T 874F with Q 674K. Used in wood/oil applicat ions. Fig. 96. Sch ematic and hookup o f T874C with Q674C. Used in standard a pplications. H1 FALL 1 OFF WOOD SYSTEM SWITCH H1 ANTICIPATOR WOOD/OIL OIL OIL LED (RED) W2 M5984 POWER SUPPLY. PROVIDE DISCONE[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 123 60-2485 — 8 Fig. 97. Sc hematic and hookup o f T874P with Q674C. Used in heat pump application s . Fig. 98. Sch ematic and hookup of T874D with Q674E. Used in standard a pplications. H2 FALL H1 RISE CO L1 (HOT) L2 1 C1 RISE COMPRESSOR CONTACTOR FAN RELAY CLOSED-DAY OPEN-NITE B RELAY SERVICE LED ([...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 4 Fig. 99. Sch ematic and hookup o f T874C with Q674C. Used in standard a pplications. L2 1 ON H1 ANTICIPATOR H2 ANTICIPATOR H1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. MOMENTARY POSITION. SPRING RETURN TO "ON" UPON SWITCH RELEASE. H1 AND C[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 125 60-2485 — 8 Fig. 100. Schematic and hookup of T874W with Q674C . Used in s tandard application s. Fig. 101. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. L2 1 ON H1 ANTICIPATOR H2 ANTICIPATOR H1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQU[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 6 Fig. 102. S chematic and hookup of T874J,R w ith Q674L . Used in hea t pump ap plications. H2 FALL H1 FALL C1 L1 (HOT) L2 1 L1 (HOT) L2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FIELD WIRE JUMPER TO ALLOW SINGLE SYSTEM TRANSFORMER. 1 2 THERMOSTAT [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 127 60-2485 — 8 Fig. 103. Sc hematic and hookup of T874G with Q674L. Use d in heat pum p applications. Fig. 104. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 ANTICIPATOR 1 SUPL. HT. LED (RED) M4665 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQ[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 2 8 Fig. 105. Sc hematic and hookup of T874C with Q674L. Used in heat pump applicatio ns. Fig. 106. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. OFF COOL IHRI RHI FAN SWITCH ON SYSTEM SWITCH SYSTEM MONITOR SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 129 60-2485 — 8 Fig. 107. Sc hematic and hookup of T874D with Q674L. Used in heat pump applicatio ns. Fig. 108. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. C2 RISE C1 RISE H2 FALL H1 FALL L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 3 0 Fig. 109. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1 FALL C1 H1/ C1 ANTICIPATOR SYSTEM SWITCH FAN SWITCH AUTO ON[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 131 60-2485 — 8 Fig. 1 10. Schematic and h ookup of T87C,R with Q 674L. Used in heat pump applica tions. L1 (HOT) L2 1 F EM. HT. LED (YELLOW) R SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2854 VR H1 FALL E AUTO ON F[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 3 2 Fig. 1 1 1. Schematic and hookup of T874R with Q674L. Us ed in heat pu mp applications. L1 (HOT) L2 1 COOL HEAT FALL H2 SYSTEM SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2851 OFF H1 C1 2 REMOVE FACTORY INSTALLED V-VR JUMPER WHEN CONNECTING A [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 133 60-2485 — 8 Fig. 1 12. Schem atic and hoo kup of T874R w ith Q674 L. Used in hea t pump a pplications. OFF COOL COMPRESSOR FAILURE FAN SWITCH ON SYSTEM SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M8383 AUX. HT. RELAY 4 EM. HT. LED (RED) AUX. HT. LED (GREEN[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 3 4 Fig. 1 13. Schem atic and hoo kup of T874R w ith Q674 L. Used in hea t pump a pplications. H2 H1 FALL C1 L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1/C1 ANTICIPATOR FALL H2 ANTICIPATOR SYSTEM SWITCH[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 135 60-2485 — 8 Fig. 1 14. Schem atic and hoo kup of T874D w ith Q674 L. Used in hea t pump a pplications. L1 (HOT) L2 1 F E SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2 H1 FALL R AUTO ON FAN SWITCH X V M L FAN REL[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 3 6 Fig. 1 15. Schem atic and hoo kup of T874R w ith Q674 L. Used in hea t pump a pplications. M5072A (HOT) L1 L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR COOL CHANGEOVER VALVE EM. HT. RELAY RTD 1 AUX. HT. [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 137 60-2485 — 8 Fig. 1 16. Schem atic and hoo kup of T874R w ith Q674 L. Used in hea t pump a pplications. H2 FALL H1 FALL C1 YR COM G W O EH O G Y A H W2 R B X E L1 (HOT) L2 1 COMPRESSOR CONTACTOR AUX. HT. RELAY EM. HT. RELAY EM. HT. LED (RED) EM. HT. HEAT OFF COOL COMP. FAULT LED (YELLOW) SYSTEM SW[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 3 8 Fig. 1 17. Schem atic and hoo kup of T874D w ith Q674 L. Used in hea t pump a pplications. H1 FALL L1 (HOT) L2 R B 2 3 4 5 6 G Y1 Y2 W X L O ENTHALPY CONTROL RELAY HEAT RELAY CONTACT 1 DEFROST RELAY H1 ANTICIPATOR H2 ANTICIPATOR C1 ANTICIPATOR C2 ANTICIPATOR 2 2 1 1 POWER SUPPLY. PROV[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 139 60-2485 — 8 Fig. 1 18. Schematic a nd hookup of T 874W with Q674L. Use d in hea t pump applic ations. H1 FALL H2 FALL L1 (HOT) L2 R B 2 1 3 4 5 6 G Y1 Y2 O X E A ECONOMIZER RELAY HEAT RELAY CONTACT 1 DEFROST RELAY H2 ANTICIPATOR H1 ANTICIPATOR H3 ANTICIPATOR C2 ANTICIPATOR C1 ANTICIPATOR RESET HE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 0 Fig. 1 19. Schem atic and hoo kup of T874R w ith Q674 L. Used in hea t pump a pplications. Fig. 120. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 FALL C1 L1 (HOT) L2 1 H2 FALL SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR C1 ANTICIPATOR POWER SUP[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 141 60-2485 — 8 Fig. 121. Sc hematic and hookup of T874C with Q674L. Used in heat pump applicatio ns. L1 (HOT) L2 1 R L X W2 G O E B Y ODT1 EHR1 ODT2 EHR2 RTD2 RTD3 RTD1 COMPRESSOR FAILURE HEAT CHANGEOVER VALVE COMPRESSOR CONTACTOR LACO CHP EM. HT. RELAY COOL CHANGEOVER VALVE FAN RELAY RD RTD1 H1 FAL[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 2 Fig. 122. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 C1 2 3 H2 FALL 5 6 H1/C1 ANTICIPATOR H2 ANTICIPATOR AUTO ON SYSTEM SWITCH EM. HT. HEAT OFF COOL FAN RELAY G R K L 1 C Y W1 SERVICE LED (RED) EM. HT. LED (YELLOW) SERVICE COMPRESSOR CONTACTOR EM. H[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 143 60-2485 — 8 Fig. 123. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 L1 (HOT) L2 1 2 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONNECT CHANGEOVER RELAY TO B FOR HEAT CHANGEOVER, TO O FOR COOL CHANGEOVER. THERM[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 4 Fig. 124. Sch e matic and hookup of T874J wi th Q674L. Us ed in heat pu mp appl ications. H1 FALL C1 RISE CO H2 FALL CO RISE L1 (HOT) L2 1 THERMOSTAT SUBBASE SYSTEM COMPONENTS COMPRESSOR CONTACTOR FAN RELAY HEAT RELAY 1 OUTDOOR THERMOSTAT HEAT RELAY CONTACT 1 HEAT RELAY 2 HEAT RELAY C[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 145 60-2485 — 8 Fig. 125. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. L1 (HOT) L2 1 X L W2 EM. HT. LED (RED) AUX. HT. LED (GRN) AUX. HT. RELAY FAN RELAY "B" RELAY G COOL CHANGEOVER VALVE EM. HT. RELAY COMPRESSOR CONTACTOR O Y E B SYSTEM SWITCH EM. HT. HEAT OF[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 6 Fig. 126. Schematic and hookup of T874 G with Q674 P . Used in h eat pump ap plication s. Fig. 127. Sc hematic and hookup of T874C with Q674L. Used in heat pump applicatio ns. H2 H1 FALL CO RISE C1 RISE L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 147 60-2485 — 8 Fig. 128. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 129. Sc hematic and hookup of T874G with Q674L. Use d in heat pum p applications. FALL AUTO ON H1 HEAT OFF COOL L2 M5653A POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIR[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 4 8 Fig. 130. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 L1 (HOT) L2 1 2 2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY-INSTALLED JUMPER. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1/C1 ANTICIPATOR H2 [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 149 60-2485 — 8 Fig. 131. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FOR Q674L1454, IS "OFF". THERMOSTAT SUBBASE SYSTEM COMPONENTS H1/C1 ANTICI[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 5 0 Fig. 132. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 133. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 151 60-2485 — 8 Fig. 134. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 LACO CHP POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT SUBBASE SYSTEM COMPONENTS L1 (HOT) L2 1 H1/C1 ANTICIPATOR H2 ANTICIPATOR SYSTEM SWIT[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 5 2 Fig. 135. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 136. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 L1 (HOT) L2 1 R W2 L C G O E Y 2 3 4 6 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PRO[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 153 60-2485 — 8 Fig. 137. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H2 FALL H1 FALL C1 LACO CHP POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT SUBBASE SYSTEM COMPONENTS L1 (HOT) L2 1 H1/C1 ANTICIPATOR H2 ANTICIPATOR SYSTEM SWIT[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 5 4 Fig. 138. Sc hematic and hookup of T874L wi th Q674B. Used in heat pump a pplicatio ns. Fig. 139. Sc hematic and hookup of T874D with Q674F . Used in heat pu mp appli cations. M103A R1 NO2 S1 RELAY S1 NC SOLIENOID RELAY FAN RELAY FAN SWITCH AUTO ON J S G R C H2 H1 O AUX. HT. RELAY COM[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 155 60-2485 — 8 Fig. 140. Schematic and hookup of T874W with Q674L . Used in heat pump ap plications. 1 T W3 U G R E L X B O Y1 Y2 C815A OD THERMISTOR AUX. HT. RELAY FAN RELAY EM. HT. RELAY COMPRESSOR MONITOR HEAT CHANGEOVER RELAY COOL CHANGEOVER RELAY COMPRESSOR CONTACTOR 1 COMPRESSOR CONTACTOR 2 EM[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 5 6 Fig. 141 . Schematic a nd hookup of T874C with Q674F . Used in sta ndard applica tions. Fig. 142. Sc hematic and hookup of T874C, D with Q674 F . Used in stand ard applic ations. H1 FALL H2 FALL C1 RISE L1 (HOT) L2 1 H1 ANTICIPATOR 4 1 C2 RISE C1 ANTICIPATOR C2 ANTICIPATOR 8 9 10 POWE[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 157 60-2485 — 8 Fig. 143. Schematic and hookup of T874 G with Q674 B. Used in hea t pump applic ations. Fig. 144. Sch e matic and hookup of T874J wit h Q674J. Us ed in heat p ump applications . THERMOSTAT SUBBASE SYSTEM COMPONENTS M8378 H1 FALL 1 H1 ANTICIPATOR 2 FAN SWITCH AUTO ON 4 R COMPRESSOR CON[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 5 8 Fig. 145. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 146. Sc hematic and hookup of T874D with Q674F . Used in heat pu mp appli cations. OFF COOL OUTDOOR THERMOSTAT ON SYSTEM SWITCH FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOA[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 159 60-2485 — 8 Fig. 147. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 148. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H1 FALL 1 G A X W2 R AUTO COOL SYSTEM SWITCH H1 ANTICIPATOR AUTO ON FAN SWITCH 1 POWER SUPPLY. PROVIDE DISC[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 0 Fig. 149. Sc hematic and hookup of T874C with Q674F . Used in heat pu mp appli cations. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1 FALL H1 ANTICIPATOR 1 H2 FALL H2 ANTICIPATOR W1 EMR4 2R 1R 5R 3R Y1 G EMR4 EMR2 THERMAL SWITCHES FOR HEATING ELEMENTS HTR 1 C1 RISE HTR 3 HTR 2 OUTDOOR THERM[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 161 60-2485 — 8 Fig. 150. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. L1 HOT L2 1 F EM. HEAT LED (RED) V SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2852A R H1 FALL E AUTO ON FAN S[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 2 Fig. 151. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H1 FALL H2 FALL CO RISE C1 RISE L1 (HOT) L2 1 1 2 1 L1 (HOT) L2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. OPTIONAL FIELD WIRE JUMPER TO CYCLE W2 WITH H1 IN EM. [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 163 60-2485 — 8 Fig. 152 . Schematic a nd hookup of T874D with Q674F . Used in sta ndard applica tions. Fig. 153. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. OFF ON SYSTEM SWITCH FAN SWITCH 1 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQU[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 4 Fig. 154. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H2 FALL YR COM G W O EH O G Y A H E W2 R 1 COMPRESSOR CONTACTOR EM. HT. HEAT AUTO COOL COMP. FAULT LED (YELLOW) SYSTEM SWITCH FAN SWITCH AUTO ON 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLO[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 165 60-2485 — 8 Fig. 155. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H2 FALL L1 (HOT) L2 1 R W3 W2 X L G O E Y RTD1 OTD1 EHR1 ODT2 EHR2 RTD2 RTD3 RTD1 SYSTEM MONITOR FAN RELAY RD COOL CHANGEOVER VALVE EM. HT. RELAY LACO COMPRESSOR CONTACTOR CHP 2 3 4 5 6 8 9 10 H1 [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 6 Fig. 156. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 157. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. COMPRESSOR FAILURE H1 FALL H2 FALL L1 (HOT) L2 1 CO RISE H1 ANTICIPATOR 1 2 4 6 9 8 C1 RISE OFF EM. HT. SYS[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 167 60-2485 — 8 Fig. 158. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. 4 OFF EM. HT. SYSTEM SWITCH HEAT AUTO COOL AUX. HT. LED (GREEN) 1 X M5721 8 C1 ANTICIPATOR POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 CO RISE FALL H2 6 9 C1 RISE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 6 8 Fig. 159. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. Fig. 160. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. L1 (HOT) L2 1 H1 FALL H1 ANTICIPATOR H2 FALL CO RISE C1 RISE 1 2 4 6 8 9 10 O G R X Y W C1 ANTICIPATOR E OF[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 169 60-2485 — 8 Fig. 161. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. H2 ANTICIPATOR 1 SUPL. HT. LED (RED) M5724 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 SYSTEM COMPONENTS SUBBASE THERMOSTAT L1 (HOT) L2 1 H1 FALL H2 FALL 2 4 6 O [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 7 0 Fig. 162. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. H1 FALL EM. HT. LED (RED) L1 (HOT) L2 1 AUX. HT. LED (GREEN) F M5725 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 SYSTEM COMPONENTS SUBBASE THEROMSTAT B W H2 FALL [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 171 60-2485 — 8 Fig. 163. Sc hematic and hookup of T874G w ith Q674C. Used in standard a pplicatio ns. H1 FALL H2 FALL CO FALL C1 RISE L1 (HOT) L2 1 1 1 1 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. H2 HAS 10 ¡ F FIXED SETBACK FROM H1 ON T874G1485, 0-12 ¡ F ADJUS[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 7 2 Fig. 164. Sc hematic and hookup o f T874H with Q674C. Used in standard a pplications. Fig. 165. Sc hematic and hookup of T874L wi th Q674C. Used in heat pump a pplicatio ns. H1 FALL L1 (HOT) L2 1 2 OFF FAN SWITCH SYSTEM SWITCH C1 ANTICIPATOR AUTO ON M5726 POWER SUPPLY. PROVIDE DISCONN[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 173 60-2485 — 8 Fig. 166 . Schematic a nd hookup of T874D with Q674F . Used in sta ndard applica tions. H1 FALL L1 (HOT) L2 1 H1 ANTICIPATOR 1 OFF EM. HT. SYSTEM SWITCH FAN SWITCH HEAT AUTO COOL ON AUTO M5728 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 SYSTEM COMPONE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 7 4 Fig. 167. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. M1592A (HOT) L1 L2 1 LACO CHP Y B E G L X W2 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD COMPRESSOR FAILURE FAN RELAY COMPRESSOR CONTACTOR HEAT CHANGEOVER VALVE EM. HT. RELAY RTD 1 AUX. HT. LED[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 175 60-2485 — 8 Fig. 168. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 FALL C L1 (HOT) L2 1 EM. HT. LED (RED) AUX. HT. LED (GRN) W3 O L G R W2 E X X2 B W1 Y AUX. HT. RELAY EM. HT. RELAY HEAT CHANGEOVER VALVE W1 RELAY COMPRESSOR RELAY W3 RELAY COOL CHANGEOVER VALVE CO[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 7 6 Fig. 169. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H1 FALL RISE CO L1 (HOT) L2 1 3 C1 RISE 1 2 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. TERMINAL LABELED C/X ON SOME MODELS. W3 TERMINAL ON SOME MODELS ONLY. C1[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 177 60-2485 — 8 Fig. 170. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H1 FALL RISE CO L1 (HOT) L2 1 C1 RISE 1 2 3 3 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. ON SOME MODELS, Y TERMINAL MAY BE LABELED Y1. EMERGENCY HEAT RUNS CONTIN[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 7 8 Fig. 171. Sch e matic and hookup of T874J wit h Q674J. Us ed in heat p ump applications. Fig. 172. Sc hematic an d hookup of T874H wit h Q674B. Use d in heat pum p applicatio ns. H1 FALL C1 RISE CO L1 (HOT) L2 1 H1 ANTICIPATOR OFF EM. HT. SYSTEM SWITCH FAN SWITCH AUTO ON AUTO EM. HT. [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 179 60-2485 — 8 Fig. 173. Sc hematic an d hookup of T874H wit h Q674C. Use d in heat pum p applicatio ns. Fig. 174. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. H1 FALL CO RISE L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 0 Fig. 175. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. Fig. 176. Sc hematic and hookup of T874G w ith Q674C. Used in standard a pplicatio ns. FALL L1 (HOT) L2 1 O G R W2 E L C Y 2 4 6 8 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 181 60-2485 — 8 Fig. 177. Schema tic and hooku p of T874G ,H with Q674C. Us ed in standa rd applica tions. Fig. 178. Sch ematic and hookup of T874N with Q674F . Used in heat pu mp applications. H1 FALL L1 (HOT) L2 1 FALL M114C POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 2 Fig. 179. Sc hematic and hookup of T874N with Q674F . Used in heat pu mp appli cations. L1 (HOT) L2 1 W1 W2 EM. HT. LED (RED) CHECK LED (GREEN) FAN RELAY G EM. HT. RELAY COMPRESSOR CONTACTOR Y E SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR H1 H2 H2 ANTICIPATOR 1 POWER SUPPLY. PR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 183 60-2485 — 8 Fig. 180. Schematic and hookup of T874 A,D with Q674J. Used in heat pump applications. H1 FALL L1 (HOT) L2 1 H1 FALL C1 RISE C2 RISE M5957 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FILTER LED ON SOME MODELS. C2 ANTICIPATOR C1 ANTICIPATOR SYSTEM SWITCH[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 4 Fig. 181. Sc hematic an d hookup of T874K wit h Q674C. Use d in heat pum p applicatio ns. Fig. 182. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. FALL CO L1 (HOT) L2 1 1 H2 FALL H1 FALL C1 RISE 2 3 6 8 9 10 Y G R W W2 A COMPRESSOR FAULT REVERSING VALVE FA[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 185 60-2485 — 8 Fig. 183. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. Fig. 184. Schemati c and hookup of T874 A,F with Q674G . Used in sta ndard applic ations. L1 (HOT) L2 1 FAN RELAY SYSTEM SWITCH OFF EM. HT. H1 ANTICIPATOR H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNEC[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 6 Fig. 185. Sc hematic and hookup o f T874D with Q674E. Use d in standard a pplicati ons. Fig. 186. Sc hematic and hookup of T874D with Q674G. Used in s tandard a pplicatio ns. L1 (HOT) L2 1 SYSTEM SWITCH AUTO H1 ANTICIPATOR H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 187 60-2485 — 8 Fig. 187. Sc hematic and hookup o f T874C with Q674B. Used in standard a pplications. Fig. 188. Sc hematic and hookup of T874D with Q674G. Used in s tandard a pplicatio ns. L2 1 SYSTEM SWITCH OFF H1 ANTICIPATOR H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION A[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 8 8 Fig. 189. Sch e matic and hookup of T874F wit h Q674D. Use d in standard applicati ons. Fig. 190. Sc hematic and hookup of T874C with Q674L. Used in heat pump applicatio ns. H1 FALL M3960 Y1 H2 W1 1 4 6 8 9 10 FALL Y2 11 W2 RH B R Y L1 L2 RC 5 ANTICIPATOR M839 MOTOR THERMOSTAT SUBBASE[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 189 60-2485 — 8 Fig. 191. Sc hematic an d hookup of T874R wit h Q674B. Use d in heat pum p applicatio ns. Fig. 192. Sc hematic and hookup o f T874D with Q674C. Used in standard a pplications. L2 1 OFF H1/C1 ANTICIPATOR H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIR[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 9 0 Fig. 193. Sc hematic and hookup o f T874D with Q674E. Use d in standard a pplicati ons. Fig. 194. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. H1 FALL L1 (HOT) L2 1 RH W1 W2 G Y2 Y1 RC HEAT RELAY 2 HEAT RELAY 1 OFF HEAT COOL AUTO AUTO ON SYSTEM SWITCH[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 191 60-2485 — 8 Fig. 195. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 196. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. H1 FALL O G R E L X W2 FAN RELAY COOL CHANGEOVER VALVE EM. HT. OFF AUTO SYSTEM SWITCH H1 ANTICIPATOR C1 ANT[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 9 2 Fig. 197. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 198. Sch e matic and hookup of T874L with Q674E. Use d in standard applicat ions. H1 FALL C1 L1 (HOT) L2 1 G W U B F R T X2 O Y FAN RELAY AUX. HEATER RELAY COMPRESSOR MONITOR OUTDOOR THERMOSTAT [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 193 60-2485 — 8 Fig. 199. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 200. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 FALL O G R E X FAN RELAY W3 RELAY EM. HT. OFF AUTO SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 9 4 Fig. 201. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 202. Sc hematic and hookup of T874D with Q674G. Used in s tandard a pplicatio ns. T G R Z X W1 FAN RELAY EM. HEAT OFF SYSTEM SWITCH AUTO ON FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AN[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 195 60-2485 — 8 Fig. 203. Sc hematic and hookup of T874L wi th Q674C. Used in heat pump a pplicatio ns. Fig. 204 . Schematic a nd hookup of T874D with Q674F . Used in sta ndard applica tions. CO FALL Y R W OFF SYSTEM SWITCH C1 ANTICIPATOR AUTO ON FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AN[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 9 6 Fig. 205. Sc hematic an d hookup of T874H wit h Q674C. Use d in heat pum p applicatio ns. Fig. 206. Sch e matic and hookup of T874J wit h Q674J. Us ed in heat p ump applications. H1 FALL G R X1 L Y2 OFF AUTO SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITCH 1 POWER SUPPLY[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 197 60-2485 — 8 Fig. 207. Sch e matic and hookup of T874J wi th Q674L. Us ed in heat pu mp appl ications. Fig. 208. Sc hematic and hookup o f T874D with Q674D. Used in standard a pplications. H1 FALL Y G R E L W2 FAN RELAY COMPRESSOR CONTACTOR OFF COOL SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 81 9 8 Fig. 209. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 210. Sc hematic and hookup of T874Y wit h Q674E. Use d in heat pum p applicatio ns. L EM. HEAT OFF SYSTEM SWITCH AUTO ON FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTI[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 199 60-2485 — 8 Fig. 21 1. Schema tic and hook up of T874G with Q67 4F . Used in standard applications . Fig. 212. Sc hematic and hookup o f T874A with Q6 74E. Used in standard applications. H1 FALL G R L X W2 FAN RELAY W1 RELAY EM. HT. OFF AUTO SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 0 Fig. 213. Sc hematic and hookup of T874L wi th Q674C. Used in heat pump a pplicatio ns. H1 FALL Y H1 R L COMPRESSOR CONTACTOR RELAY 1 N.O. 2 HIGH ON SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR AUTO OFF FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQU[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 201 60-2485 — 8 Fig. 214. Sc hematic and hookup o f T874A with Q674B. Used in standard a pplications. H1 R L COMPRESSOR CONTACTOR HIGH ON SYSTEM SWITCH COOL OFF FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2992 THERMOSTAT SUBBASE SYSTEM COMPONENTS COOL CHA[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 2 Fig. 215. Sc hematic and hookup of T874L wi th Q674B. Used in heat pump a pplicatio ns. H1 FALL Y H1 R L COMPRESSOR CONTACTOR RELAY 1 N.O. 2 HIGH ON SYSTEM SWITCH H1 ANTICIPATOR C1 ANTICIPATOR COOL OFF FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQU[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 203 60-2485 — 8 Fig. 216. Sc hematic and hookup of T874G with Q 674J. Use d in heat pum p applicatio ns. Fig. 217. Sc hematic an d hookup of T874N wit h Q674C. Use d in heat pum p applicatio ns. H1 FALL H2 FALL CO RISE C1 RISE L1 (HOT) L2 1 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PR[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 4 Fig. 218. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. L1 (HOT) L2 1 X L W2 EM. HT. LED (RED) AUX. HT. LED (GRN) AUX. HT. RELAY FAN RELAY "B" RELAY G COOL CHANGEOVER VALVE EM. HT. RELAY COMPRESSOR CONTACTOR O Y E B SYSTEM SWITCH EM. HT. HEAT OF[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 205 60-2485 — 8 Fig. 219. Sc hematic and hookup o f T874C with Q674C. Used in standard a pplications. M5901 L1 (HOT) L2 1 FAN RELAY SERVICE LED (RED) FAN SWITCH OFF AUTO SYSTEM SWITCH AUTO C1 FALL H1 FALL 2 4 8 H1 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 6 Fig. 220. Schematic and hookup of T874W with Q674C . Used in s tandard application s. Fig. 221. Sc hematic an d hookup of T874H wit h Q674C. Use d in heat pum p applicatio ns. M5929 H1 FALL L1 (HOT) L2 1 THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 4 6 8 9 10 FAN SWITCH SYSTEM SWITCH AUTO O[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 207 60-2485 — 8 Fig. 222. Sc hematic and hookup o f T874B with Q6 74E. Used in standard applications. Fig. 223. Sch ematic and hookup o f T874S with Q674F . Used in heat pu mp applications. M5920 L1 (HOT) L2 1 C W R FAN RELAY COMPRESSOR CONTACTOR 2 HEAT RELAY MALFUNCTION LED (RED) LOW SPEED LED (GREE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 0 8 Fig. 224. Schemati c and hookup of T874A,D w ith Q674E. Used in standa rd application s. M5927 H1 FALL L1 (HOT) L2 1 L1 (HOT) L2 1 THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 4 6 8 9 10 11 FAN SWITCH SYSTEM SWITCH AUTO ON OFF HEAT AUTO COOL SERVICE LED (RED) COOL CHANGEOVER VALVE COMPRESSO[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 209 60-2485 — 8 Fig. 225. Sc hematic and hookup o f T874D with Q674C. Used in standard a pplications. M5928 H1 FALL THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 4 6 8 9 10 11 FAN SWITCH SYSTEM SWITCH AUTO ON OFF AUTO SERVICE LED (RED) COOL DAMPER COMPRESSOR CONTACTOR #2 HEAT RELAY #2 FAN RELAY COMPRESSOR C[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 1 0 Fig. 226. Sc hematic and hookup of T874G w ith Q674 G. Used in stand ard applicatio ns. M5930 H1 FALL L1 (HOT) L2 1 L1 (HOT) L2 1 THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 4 6 8 9 10 11 SYSTEM SWITCH OFF AUTO SERVICE LED (RED) FAN RELAY O COMPRESSOR CONTACTOR #2 HEAT RELAY #2 T RELAY COM[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 21 1 60-2485 — 8 Fig. 227. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. CO (HEAT) FALL H2 FALL RISE H1 FALL L1 (HOT) L2 1 2 1 2 RISE C1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. W1 - Y1 JUMPER IS Y TERMINAL; REMOVE JUMPER WHEN W1 REL[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 1 2 Fig. 228. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 FALL C1 L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVABLE JUMPER (INSTALLED). THERMOSTAT SUBBASE SYSTEM COMPONENTS H2 FALL H1/C1 ANTICIPATOR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 213 60-2485 — 8 Fig. 229. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 230. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. H1 FALL H2 FALL CO RISE C1 RISE L1 (HOT) L2 1 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTEC[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 1 4 Fig. 231. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 232. Sc hematic and hookup of T874D with Q674G. Used in s tandard a pplicatio ns. C1 RISE H2 FALL H1 FALL H1 RISE CO L1 (HOT) L2 1 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PR[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 215 60-2485 — 8 Fig. 233. Schematic and hookup of T874W with Q674L . Used in heat pump ap plications. Fig. 234. Schematic and hookup of T874 G with Q674 B. Used in hea t pump applic ations. FAN SYSTEM SWITCH COOL HEAT H1 ANTICIPATOR H1 FALL M3952 AUTO ON FAN SWITCH R G L Y X H3 E W2 B EM. HT. LED (YE[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 1 6 Fig. 235 . Schema tic and hook up of T874G and Q674 F . Used in heat p ump applica tions. Fig. 236. Schematic a nd hookup of T874A-D w ith Q674C. Used i n standard applications . H2 FALL L1 (HOT) L2 1 R W2 X L G O E Y RTD1 OTD1 EHR1 ODT2 EHR2 RTD2 RTD3 RTD1 SYSTEM MONITOR FAN RELAY RD[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 217 60-2485 — 8 Fig. 237. Sc hematic and hookup o f T874C with Q674B. Used in standard a pplications. Fig. 238. Sch ematic and hookup of T874C with Q674F . Used in heat pu mp applications. H1 H2 FALL G B R FAN RELAY OFF COOL SYSTEM SWITCH H2 ANTICIPATOR H1 ANTICIPATOR C1 ANTICIPATOR AUTO ON FAN SWITC[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 1 8 Fig. 239. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 240. S chematic and hookup of T874A with Q674W . Used in standa rd application s . L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FAN SWITCH AUTO[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 219 60-2485 — 8 Fig. 241. Sch e matic and hookup of T874J wi th Q674L. Us ed in heat pu mp appl ications. Fig. 242. Sc hematic and hookup of T874G w ith Q674C. Used in standard a pplicatio ns. RISE L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FAN SWITCH [...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 2 0 Fig. 243. Sc hematic and hookup of T874G with Q 674F . Used in hea t pump appli cations. Fig. 244. Sch e matic and hookup of T874J wit h Q674J. Us ed in heat p ump applications. H1 FALL RISE CO L1 (HOT) L2 1 C1 RISE 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION [...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 221 60-2485 — 8 Fig. 245. Sc hematic and hookup of T874R with Q674L. Used in heat pump applicatio ns. Fig. 246. Sc hematic and hookup of T874C with Q674G. Used in s tandard a pplicatio ns. H1 FALL L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. TERMINAL[...]

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485 — 82 2 2 Fig. 247. Schematic and hookup of T874W with Q674L . Used in heat pump ap plications. 1 T W3 G R E X1 C B O X2 Y1 Y2 C815A OUTDOOR THERMISTOR AUX. HT. RELAY FAN RELAY EM. HT. RELAY CHANGEOVER RELAY (HEAT) CHANGEOVER RELAY (COOL) COMPRESSOR CONTACTOR 1 COMPRESSOR CONTACTOR 2 EM.HT. AUT[...]

T874 M ULTISTAGE THERMOSTATS AND Q674 SUBBASES 223 60-2485 — 8 Fig. 248. Sch ematic and hookup o f T874Y with Q674F . Used in heat pu mp applications. M5923 L1 (HOT) L2 1 C E R FAN RELAY COMPRESSOR CONTACTOR 2 EM.HT. RELAY MALFUNCTION LED (RED) LOW SPEED LED (GREEN) SYSTEM SWITCH HEAT AUTO COOL C2 RISE H1 FALL 2 3 4 8 H1 ANTICIPATOR 1 POWER SUPPL[...]

60-2485 — 8 J. H. Rev . 3- 01 www .h one y well.com Home and Building Control Home and Building Control Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. T874 MULTISTAG[...]