Carrier 52C manual

52C ,P SERIES PT A C Customer Suppor t Center 1•800•894•644 9 SERVICE TECHNICIAN GUIDE PACKAGED TERMINAL AIR CONDITIONERS AND HEAT PUMPS CONTENTS Page INTRO DUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3 SUMMAR Y OF DANGERS, W ARNINGS, AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 UNIT D[...]

52C , P SERIES 2 INTRODUCTION The focus of this manual is to provid e basic information on service procedur es, safety, troubleshooting, clean- ing, and component rep lacement for service tech ni- cians. It is in tended for use only by HVAC ser vice technicians who have succes sfully com pleted instruc tion and rec eived Type I C ertific ation from[...]

3 UNIT DISASSEMBL Y This section incl udes common procedures for disas- semb ly and re-ass embly o f unit . TOOLS NEEDED The follow ing field-s upplied items ar e reco mmended for genera l disassembl y of the unit: • Flat head screw driver • 5 / 16 -in. nut driver • Safet y glasses • Needle no se pliers REMOVE FRONT P ANEL NOTE: Before remo[...]

52C , P SERIES 4 OPEN THE CONTROL BOX The control b ox is factory wire d. To open the box, remove the 2 screws on the top o f the control box and lower the front hinged panel. S ee Figure 6. REMOVE THE UNIT FROM THE W ALL SLEEVE 1. Rem o ve the four mou nti ng sc re ws tha t sec ure th e PTAC unit to the wall sleeve (2 screws per side). See Fig u r[...]

5 ACCESSING UNIT COMPONENTS ACCESSING INDOOR-AIR SE CTION COMPONENTS ■ REMOVE LA TERAL DUCT EXTENSION ACCESSOR Y FOR UNITS EQUIPPED WITH TH E LA TERAL DUCT 1. Remove the 2 top screws that secure the lateral duct pl enum to the to p of th e later al du ct exte n- sion. See F igu re 8. 2. Lo cate and remove the 2 bottom bracket scre ws (located o p[...]

52C , P SERIES 6 ■ DET ACH THE CONDENSER ORIFICE FROM THE CONDENSER COIL 1. Remo ve top h alf of condens er o rifice . a. Unscrew the top hal f of the cond ens er ori fice b y backing of f the 4 captive scre ws. See Figure 13. b. Using a flat head screwdriver, gently pry the top hal f of the orif ice from the t ube sheets . See Figur e 14. c. Rem[...]

7 GUSSET SCREWS GUSSET SCREWS P AR TITION GUSSET CONDENSER ORIFICE (PLASTIC) GUSSET CONDENSER ORIFICE CAPTIVE SCREWS (2) CAPTIVE SCREWS (2) FIGU RE 12 — GUSSE T RE M O V AL FIGURE 13 — LOCA TION OF CAPTIVE SCREWS ON COND ENSER ORIFICE FIGURE 14 — PR YING CONDENSER ORIFICE A W A Y FRO M TUBE SHEET FIGURE 15 — REMOV ING TOP OF CONDENSER ORIFI[...]

52C , P SERIES 8 REINST ALL FRONT P ANEL 1. Grasp the front pa nel firmly at the center of the top and bot tom of the pan el, tilt ing i t forwa rd 5 to 10 deg rees from the v ertica l. S ee Fi gure 4 . 2. Plac e the top of t he fr ont pan el on to the unit, makin g sur e the to p eng agem ent p osts h ave engaged t he slots on th e unit. T he top [...]

9 GENERAL CLEANING Maintaini n g p roper performance of 52C,P systems requires conscientious cleaning and care of compo- nent s. See F igu re 20. Speci fic com pon ents re qui re periodic cleaning and /or replacemen t, inclu ding the follow ing: COMPONENT CLEANING SCHEDULE CLEANING AND SAFETY Before starting to clean a unit, read the inst ructions [...]

52C , P SERIES 10 TOOLS NEEDED The foll owing li st includes the recommended too ls, devices, and cl eaning solution s for use in cleaning the 52C,P unit and comp onents . MONTHL Y CLEANING ■ AI R FIL TERS — The indoo r and vent air filters should be cleane d once per month. Filt ers that are not cleaned become clogged and will restrict airflow[...]

11 SEASONAL CLEANING The ind oor and o utdoor co ils shou ld be clea ned at le ast once durin g eve ry se ason. Ref er to ACCESSING UNIT COMP ONENTS section to prepare unit. ■ CL EAN ING TH E I NDO OR AND OU TDOOR COILS 1. Use a vacuum cleaner or so ft bristle brush t o remove surface fibers and dirt from the int erior surface of evapor ator coi [...]

52C , P SERIES 12 DRAIN V AL VE FIGURE 24 — V ACUUMING EV APORA TOR COI L FIGURE 2 5 — CLE A NI NG COILS FIGURE 23 — PT AC EXTERIOR SURF ACES FIGURE 2 6 — B A SEP AN SECTION[...]

13 COMPRESSOR A cutaway view of the rotary compr essor with key component s labele d is sho wn in Figure 27. Th e motor stator is rigidly attached to the compressor shell. The rotor is p ressed onto the e ccentric shaft, which is sup- port ed by 2 bearin gs. Both t he di sch arge valve a nd dis- charge muffl er are atta ched to the moto r bearing .[...]

52C , P SERIES 14 The rotary compress ion proce ss (Figure 28), starts at top dead cent er as shown in (1). Suction gas flow s through the suct io n inlet and into the cylinder area . As the shaft rotates throu gh 90 d egree s, the rollin g piston moves to posit ion A as shown in (2). The suction volume is now the area defined b y point A and the t[...]

15 FIGURE 29 — BASIC COMPRESS OR TROUBLESHOOTING GUIDE 5. Next, pe rform a grounded wind ings test to test the resistance individually of each wire to the shell of the comp ress or. The pa in t on the compres - sor ca n pre vent goo d cont act b etwee n the prob e and the met al. Th e paint sh ould be remov ed from a small s ection of t he shell [...]

52C , P SERIES 16 ■ TOOLS NEEDED — The fo llowing list i nclu des the recommended t ools and devices for removing and replacing the compres sor. ■ REMOVING TH E COMPRESSOR — Follow the steps below to remove t he compressor: 1. Disconne ct all po wer to unit . 2. Remove unit fr om wall sleev e as deta iled in the UNIT DISASSEMBLY s ection. T[...]

17 12. Insta ll the new compress or and the new capilla ry assembly (the correct capillary and strainer may be obtaine d from Carrier RCD), int o t he unit. 13. Leak che ck the unit with 150 ps i of nitrog en pressure. 14. For 52C, P units, th e sy stem shoul d be evacua ted from the high sid e to the low side to a minimum of 200 microns of mercury[...]

52C , P SERIES 18 HEA TERS The heater in 52C,P uni t s is located directly behind the evap orator coi l. The heater a ssembly incl udes the heater (2.3 k W, 3.4 kW o r 5 kW), a primary limit switch, and a secondary limit switch. See Figure 34. The primary and se condary li mit switche s are safe ty swi tches t hat regu lat e heater operat ion. Th e[...]

19 ■ TOOLS NEEDED — The fo llowing list i nclu des rec - ommende d tools a nd devices for working on the hea ter section of 52C,P units. Perf orm th e follo w i ng ste ps to remove th e Heater Assembly. 1. DISC ONNECT ALL PO WER TO U NIT. 2. Remo ve he ater by follo wing instr uction s in ACCESSING UNIT COMPONENTS section. After the heater is r[...]

52C , P SERIES 20 OPERA TIN G CONTROLS UNIT -MOUNTED CONTR OLS The controls and compone nts used in the 52C,P cool- ing only or heat/cool units are as follo ws: the selec- tor switch, the indoor thermostat, the dual capacitor, the tempe rature lim iter, the ve nt lever, and the fan cycle switch. See Figure 37. The selector switc h is used to determ[...]

21 W ALL-MOUNTED THER MOST A T CONTROLS For 52C,P wall thermostat cont rol (RC, RP) units, all c ontro ls ar e loc ated on the wall- m ount e d thermost at except the v ent lever and out door thermo- stat. Remote control is a fa ctory or field-insta lled opt ion. There are 3 style s of th ermostats q ualifie d for use with 52C,P se ries Remote Cont[...]

52C , P SERIES 22 R Y W G O C R Y W G O C R Y W G O C R Y W G O C R Y W G O C T ’ S TAT MASTER PT AC UNIT 1 UNIT 2 UNIT 3 FIGURE 43 — TYPICAL WIRING FOR MUL TIPLE 52C PT AC UNITS CONNECTED TO ONE W ALL THERMOST A T All units must be connected to same groun d source. To accomplish this, be sure to connect all units b ack to the s ame bre aker b [...]

23 DESCRIPTION OF SELECTO R SWITCH SETTINGS (Figure 44) ■ OFF MODE — The OFF pos ition termin a tes unit operat ion. ■ F AN ONL Y MOD E — Use fan only p osition for air circulation without heating or cooling. Fan runs at high speed. ■ HIGH H EA T OR HIGH COOL M ODE — Pos ition selector and temperature co ntrol knobs to desired com- fort[...]

52C , P SERIES 24 SEQUENCE OF OPERA TIO N ■ HEA T/COOL UNITS (Figure 45) Fan Mo de — W ith th e sele ctor swit ch set to FAN c on- tacts L1 to HI and FC S1 to L S are m ade. Cooli ng (L ow) — With the se lector swi tch set t o low speed co oling c ontact s FCS2 to LO, CO MP to F CS1, and COMP t o IT3 are ma de. Cooling (High) — Wit h the se[...]

25 The Manufacture r reserves the right to discontinue, or change at a ny time, s pecification s or desig ns witho ut notice and without incurring obligations . ■ INDOOR THERMOST A T (Heat/Cool and Cool Only Units) (Figu re 48) — The thermost at maint ains the selected te mperature by cycling the compress or on and off during co oling operat io[...]

52C , P SERIES 26 ■ OU TDOOR FROST THERM OST A T (Heat Pump Units) (Figure 50A and 50B) — The Outdoor Frost Thermo stat (OFT ) is a t hermostat that u ses a sin gle- pole switch with a manual override selector. The ther- mostat swit ches betwe en elect ri c heat a nd co mpressor operatio n when the tempe rature of the outdoor coil falls belo w [...]

27 5. The reading on the meter should first indicate zero, or a lo w resistance , then slowly ri se toward infinit y or some high val u e or measurabl e re sis- tance. Th is indicat es the capaci tor is mos t likely good. If t h e reading goes to zero or a l ow res is- tance and st ays there, t he capacitor i s likely shorted and nee ds replacement[...]

52C , P SERIES 28 4. Remove the thermost at capillary from the out door coil and clip any wire ties holding the capillary in place. 5. Disconnect the wires and carefully remove the thermostat an d capillary from the unit, noting location of wires for easy re-assembly. 6. Rev erse St eps 1- 5 to rei nstal l. ■ CAP ACIT OR — To remove the capacit[...]

29 F AN MOTOR The fan motor is a permanent split capacitor (PSC) type motor. This motor is common in air-conditioning syst em ap pl icat ions. A PSC m oto r do es no t r equi re the use of a relay and always has a run capacitor con- nected be tween the run a nd start wi ndi ngs of the motor . See Figure 55. The 52C, P series fan moto r has a motor [...]

52C , P SERIES 30 FIGURE 56 — F AN MOTOR TROU BLESHOO TING CHAR T TYPICAL 208/230 V OL T MOTORS NO TE: Resistance values are approximate. TYPICAL 26 5 VOL T MOTORS NO TE: Resistance values are approximate. FIGURE 57 — TYPICAL 52C,P F A N MOTORS POSSI BLE C A USE SYMPTOM Moto r Hum s But Does Not Start Makes No Noise and Does No t Star t Star ts[...]

31 F AN MOTOR REPLACEMEN T 1. DISC ONNEC T ALL POWER TO U NIT . 2. Remove t he unit from the slee ve as detailed i n the UNIT DISASS EMBLY section and plac e the unit on a large flat surface. 3. Remove the disc harge deck and grille as detailed in Remove the Di scharge Deck Asse mbly sectio n. 4. Remo ve heat er pla te asse mbly a s deta iled i n A[...]

52C , P SERIES 32 14 16 18 20 22 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIELD TEMPERA TURE CHA R TS Refer to Figures 59-67 for field t empe rature data. FIGURE 59 — 52C AND 52 P 7000 BTU UNIT FIELD T EMPERA TURE CHAR T — HIGH COOL ?[...]

33 16 18 20 22 24 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIGUR E 60 — 52C A ND 52P 9000 BTU UNIT F IELD TEMPERA TURE CHAR T — HIGH COO L — 50% RH[...]

52C , P SERIES 34 18 20 22 24 26 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIGURE 61 — 52P 12 ,000 BTU UNIT FIELD TEMPERA TURE CHAR T — HIGH COOL — 50% RH[...]

35 20 22 24 26 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIGURE 62 — 5 2CQ 12,000 BTU HE A T PUMP UNIT FI E LD TEMPERA TURE CHAR T — HIGH COOL — 50% RH[...]

52C , P SERIES 36 18 20 22 24 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIGURE 63 — 52CE 1 2,000 BTU HEA T/COO L UNIT FIEL D TEMPERA TURE CHAR T — HIGH COOL — 50% R H[...]

37 18 20 22 24 26 28 50 60 70 80 90 100 1 10 120 130 Outdoor Air T emperature (F) (40% RH) 70 F Indoor 75 F Indoor 80 F Indoor 85 F Indoor Indoor Coil Delta T emperature (F) FIGURE 64 — 52C AND 52 P 15,000 BT U UNIT FIEL D TEMPER A TURE CHA R T — HIGH C OOL — 50% RH[...]

52C , P SERIES 38 20 25 30 35 40 50 52 54 56 58 60 62 64 66 68 70 72 74 Indoor Entering Air T emperature (F) Indoor Air T emperature Rise (F) 208 V , 2.3 kW 208 V , 3.4 kW 230/265 V , 2.3 kW 230/265 V , 3.4 kW FIGURE 65 — 5 2C AND 52P 7000/ 9000 BTU UNIT FI ELD TEMPERA TURE CHAR T FOR ELECTRIC HEA T — HIGH HEA T[...]

39 15 20 25 30 35 40 45 50 52 54 56 58 60 62 64 66 68 70 72 74 Indoor Entering Air T emperature (F) 208 V , 2.3 kW 208 V , 3.4 kW 208 V , 5.0 kW 230/265 V , 2.3 kW 230/265 V , 3.4 kW 230/265 V , 5.0 kW Indoor Air T emperature Rise (F) FIGURE 66 — 52 C AND 52P 12,000/ 15,000 BTU UNIT FIELD TEMPERA TURE CHAR T FOR ELECTRI C HEA T — HIGH HEA T[...]

52C , P SERIES 40 15 20 25 30 35 40 50 52 54 56 58 60 62 64 66 68 70 72 Indoor Entering Air T emperature (F) 7,000 Btu 9,000 Btu 52P-12,000 Btu 52C-12,000 Btu 15,000 Btu Indoor Air T emperature Rise (F) FIGURE 67 — 52C A ND 52P 7,000-15 ,000 BTU UNIT FI ELD TEMPERA TURE CHAR T FOR REVERSE CYCLE HEA T — HIGH HEA T 47 F (DR YBULB)/43 F (WET B ULB[...]

41 WIRING DIAGRAMS Refer to Figures 68-72 for Typical Wiring Schematics. NOTE: Figures 68-72 should not be substituted for the schematic located on cont rol box. FIGURE 68 — 52CQ & 52PQ — TY PICAL WI RING SCHEMA TIC FO R ST ANDARD HEA T PUMP UNITS COMPONENT LEGEND Compon ent Con nection (Marked ) Compon ent Con nection (Unmar ked) Accessor [...]

52C , P SERIES 42 TY PICAL T HERM OST A T INTE RF ACE 1. If ‘ W ’ is ON, th en ‘ FR ’ is f orced O N (regardle ss of ‘ G ’ ) & ‘ CR ’ is forced OFF . 2. If ‘ Y ’ is ON, the n ‘ FR ’ is f orced ON (reg ardless of ‘ G ’ ). 3. If IFT ( indoor coil) is < 3 5 ° F , then ‘ CR ’ is f orced OFF until IFT is > 39 ?[...]

43 FIGURE 70 — 52CE AND 52PE — TYPICAL WIRING SCHEMA TI C FOR ST ANDARD H EA T/COOL U NITS COMPONENT LEGEND Compon ent Con nection (Marked ) Compon ent Con nection (Unmar ked) Accessor y or O ptional Wir ing T o Ind icate Commo n P otential Only Not T o Represe nt Wire CAP — Capacitor COMP — Compressor FM — Fa n M o t o r FCS — F an Cyc[...]

52C , P SERIES 44 FIGURE 71 — 52CE AND 52PE — TYPICAL WIRING SCHEMA TIC FOR W ALL THERMOST A T CONTROL HEA T/COOL UNITS NOTES: 1. Recommended f or use on grounded po wer supply o nly . 2. Compressor and f an motor th ermally protected. 3. Use copper conducto rs only . 4. A ll wiring must conform with NEC and local codes. 5. Dashed lines indicat[...]

45 FIGURE 72 — 52PC — TYPICAL WIR ING SCHEMA TIC FOR ST ANDAR D CO OL ING ONL Y UNITS[...]

52C , P SERIES 46 MOST FREQUENT PT AC SER VICE QUESTIONS 1. Can rem ote wall th erm os tat s be u se d on standard (AA) model s? No, only for use on remote cont rol (R C,RP) models . H ow- ever, ac cessory RC- Retrofit Ki t can be ordered t o conver t standa rd un i ts to R C uni ts. 2. Whic h remo te ther mostat s are acc ept ab le for u se on 52C[...]

47 ACCE SSORIES *Extend ed metal wall sleev e also available in 26 in. and 28 in. dept h. † Custom colors are also av ailable. A CCESSOR Y FORM NUMBER P ART NUMBER DESCRIPTION Wall S leeves 52S-48 SI W ALL-SL EEVE-1P K Non-I nsulated Plastic W all Sle ev e, 1 per pa ck W ALL -SLEE VE-9 PK Non -Ins ulate d Plas tic W all Slee ve , 9 per pack SLEEV[...]

52C , P SERIES 48 52C PERFORMANCE AND PHYSICAL DA T A FIGURE 73 — 52 CE — PERFORMAN CE AN D PHYSICAL DA T A FOR ST ANDARD HEA T/COO L UNITS FIGURE 74 — 52 CQ — PERFORM ANCE AND P HY SICAL DA T A FO R ST ANDAR D HEA T PUMP U NITS CA T ALOG NUMBER COOLING (Btuh) EER EL ECTRI C HEA T (Btuh) COP REVERSE CYCLE HEA T (Btuh) EV AP . F AN CFM (HI-S[...]

49 52P PERFORMANCE AND PHYSICAL DA T A FIGURE 75 — 52PE — PERFORMANCE AND PHYSICAL DA T A FOR ST ANDARD HEA T/COOL UNITS FIGURE 76 — 52PQ — PERFORMANCE AND PHYSICAL DA T A FOR ST ANDARD HEA T PUMP UNITS CA T ALOG NUMBER COOLING (Btuh) EER ELECTRIC HEA T (Btu h) COP REVER SE CYCLE HEA T (Btuh) EV AP . F AN CFM (HI-SPE ED) APPRO X. WEIGHT (SH[...]

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Copyright 20 02 Car rier Cor poration Manufa ctur er rese rve s the righ t to dis cont inue, or ch ange a t any tim e, s pecif icati ons or des igns without noti ce an d with out inc urring o bligations. PC 132 Catalog No. 535-20 050 Prin ted in U.S.A. Form 52C,P-2SM Pg 52 11-02 Rep laces: 52 C,P-1SM Book 1 4 T ab 9a 11a[...]