Lochinvar SNR200-100 manual

TM Installa tion & Ser vice Manual Models: SNR150-100, SNR200-100, SNA285-125, SNA400-125, AND SNA500-125 T h i s m a n u a l m u s t o n l y b e u s e d b y a qualified heating installer / serv ice technician. R ead all instructions in this manual before installing. P erform steps in the order give n. Failure t o comply could result in sev ere[...]

2 Contents PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . 3 Hazard Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 THE SHIELD -- HOW IT WORKS . . . . . . . . . . . . . . . . . 4-6 RA TINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1. DETERMINE W A TER HEA TER LOCA TION Closet and Alcove Insta[...]

Please r ead bef or e pr oceeding Installer – R ead all inst ructions, in this manual before installing. Perform st eps in the order given. Ha ve this water heater serviced/inspected by a qualified serv ice technician, at least annually . Failure t o co mply with the above could r esult in severe personal injury , death or substantial property da[...]

4 T he Shield - How it w or ks... 1. A ccess c over - front Pr ovides access to the gas train and heat ex changer . 2. Air intake adapt er Allows for the co nnection of the PV C air intake pipe t o the water heater . 3. Air pressure switch The air pressure switch det ects blocked inlet c onditions. 4. Air shroud (500-125 M o del Only_N ot Show n) T[...]

1 9 25 Front View - Models SNR150-100 -- SNA285-125 29 17 5 16 19 18 9 13 2 23 21 10 20 28 11 14 33 Left Side (inside unit) -- Models SNR150-100 - SNA285-125 29 17 5 16 33 26 9 25 13 8 2 23 14 30 27 3 22 Right Side (inside unit) -- Models SNR150-100 - SNA285-125 T he Shield - How it w or ks... (continued) 32 2 35 36 7 13 34 28 24 31 Rear View - Mod[...]

6 T he Shield - How it w or ks... 2 13 35 32 36 34 7 31 Rear View - Model SNA400-125 2 15 35 32 36 34 7 28 25 24 Rear View - Model SNA500-125 Right Side (inside unit) - Model SNA500-125 Right Side (inside unit) - Model SNA400-125 Model SNA400-125 Model SNA500-125 9 26 35 22 8 23 15 16 33 17 29 5 30 9 26 27 25 8 23 15 16 17 29 5 3 Installation &[...]

Ra tings Notes: 1. Shield water heaters r equire special gas venting. U se only the vent mat erials and methods specified in the Shield Installation and Serv ice M anual. 2. Standard Shield water heat ers are equipped to operate from sea level t o 4,500 feet only w ith no adjustments. The water heater will de-rate by 4% for each 1,000 feet abov e s[...]

8 The Shield water heater gas manifold and controls met safe lighting and other performance under tests specified in ANSI Z21.10.3 – latest edition. Failure t o keep wate r heater area clear and free of combustible materials, gasoline, and other flammable liquids and vapors can result in sever e personal injur y , death, or substantial property d[...]

OPEN FRONT 1" MINI MUM CLEARANCE AROUND HOT W A TER PIPES AND VENT PIPE Figure 1-2 Alcove Inst allation - Minimum Required Clearances 1" MINI MUM CLEARANCE AROUND HOT WATER PIPES AND VENT PIPE CLOSED DO OR VENTILA TING AIR OPENING VENTILA TING AIR OPENING * A RE A O F EACH OPE NING : 1 SQ. I NCH PER 100 0 BTU P ER HOUR INPU T W ITH A MINI[...]

10 Do not install the water heater on carpeting even if foundation is used. Fire can r esult, causing severe personal injury , death, or substantial property damage. W hen local codes requir e complianc e with NSF 5, the heater must be sealed to the floor with a food grade silicone to prevent debris and harb orage of vermin under the heater . If fl[...]

W hen removing a w ater heater from e xisting common v ent system: Do not install the Shield water heater int o a common v ent w ith any other applianc e. This will cause flue gas spillage or appliance malfunction, resulting in possible severe personal injury , death, or substantial property damage. Failure t o follow all instructions can result in[...]

1 Deter mine wa ter heater loca tion 12 Figure 1-3_ Combustion Air Direct from Outside 1. If air is taken directly fr om outside the building with no duct, pro v ide two permanent openings to the equipment room (see FIG. 1-3): (a) Combustion air opening, with a minimum free area of one square inch per 4000 Btu/hr input (5.5 cm 2 per kW). This openi[...]

1 Deter mine wa ter heater loca tion (continued) 13 T ABLE - 1B MINIMUM RECOMMENDED COMBUSTION AIR SUPPL Y T O EQUIPMENT ROOM Mo de l N umber FIG. 1-3 FIG. 1-4 FIG. 1-5 FIG. 1-6 *Outside Air from 2 Openings Directly from Outdoors *Outside Air from 2 Ducts Deliver e d from Outdoors **Inside Air from 2 Ducts Deliver ed from Interior Space *Outside Ai[...]

14 Figure 2-1 V ertical Direct Venting (T wo-Pipe V ertical T ermination) - See page 25 for more details Figure 2-2 Sidewall Direct V enting (T wo-Pipe Sidewall T ermination) - See page 18 for more details Figure 2-3 Concentric V ertical T ermination - See page 27 for more det ails Figure 2-4 Concentric Sidewall T ermination - See page 22 for more [...]

15 V ent piping materials U se only the materials listed in T able 2A below for v ent pipe, and fittings. Failure to comply c ould result in sever e personal injur y , death, or substantial pr opert y damage. Installation must c omply with local requirements and with the N ational Fuel Gas Code, ANSI Z223.1 for U .S. installations or CSA B149.1 for[...]

16 Air intak e/vent connections 1. Combustion Air Intak e Connector (FIG. ’ s 2-5 and 2-6) - U sed to provide combustion air dir ectly to the unit from outd oors. A fitting is pr ovided on the unit for final connection. Combustion air piping must be supported per guidelines listed in the N ational Mechanical C ode, Section 305, T able 305.4 or as[...]

17 2 Gener al venting (continued) V ent, air piping and termination: The Shield water heater v ent and air piping can be installed through the roof or through a sidewall. F ollow the procedur es in this manual for the method chosen. Refer to the information in this manual to det ermine acceptable v ent and air piping length. Air cont amination P oo[...]

18 3 Sidewall direct v enting V ent/air ter mination – sidewall Follo w inst ructions below when determining vent location t o avoid possibility of severe personal injury , death, or substantial property damage. A gas vent e xtending through an ext erior wall shall not terminate adjac ent to a wall or below building ext ensions such as eav es, pa[...]

19 V ent/air ter mination – sidewall 3 Sidewall direct v enting (continued) VENT / AIR TERMINA TION 12" MIN. 12" MIN. 12" MIN. Figure 3-2 Clearance to Gravity Air Inlets FORCED AIR INLET VENT / AIR TERMINA TION 7' M IN. ABOVE ANY PUBLIC WALKW AY IF LESS THAN 10’ 36" MIN. Figure 3-3A Clearance to Forced Air Inlets 5. Mai[...]

20 3 Sidewall direct v enting VENT PIPING GAL V ANIZED THIMBLE VENT CAP AIR PIPING WALL PLA TE VENT PLA TE Figure 3-4A Sidewall T ermination Assembly Prepar e wall penetrations 1. Use the factory supplied wall plate as a templat e to locate the vent and air intak e holes and mounting holes. Air pipe penetration: a. Cu t a hole for the air pipe. Siz[...]

21 3 Sidewall direct v enting (continued) V ent/air ter mination – sidewall All vent pipes and air inlets m ust terminate at the same height to av oid possibilit y of severe personal injury , death, or substantial property damage. Multiple v ent/air ter minations 1. When terminating multiple Shield wat er heaters te rminate each ve nt/air connect[...]

22 3 Sidewall direct v enting Figure 3-7 Kit Contents_CVK3003 - SNR150-100 -- SNR200-100 Sidewall termination inst allation 1. Determine the best location for the termination kit (see FIG. 3-6). 2. The total length of piping for vent or air must not e xc eed the limits given in the Gener al V e nting section on page 17 of this manual. 3. Y ou must [...]

23 Sidewall ter mination – optional concentric v ent Figure 3-9 Concentric V ent Dimensional Drawing - Models SNR150-100 -- SNR200-100 / CVK3003 Instead of cementing the smaller pipe to the rain cap, a field-supplied stainless steel screw ma y be used to secure the tw o (2) components together when field disassembly is desired for cleaning (see F[...]

24 3 Sidewall direct v enting Sidewall ter mination – optional concentric v ent Multiventing sidewall terminations W hen two (2) or more dir ect vent appliances are v ented near each other , each appliance must be individually vent ed (see FIG. 3-13). NEVER common vent or br each vent this appliance. W hen two (2) or more dir ect vent appliances [...]

25 4 V er tical dir ect v enting V ent/air ter mination – v er tical Follo w inst ructions below when determining vent location t o avoid possibility of severe personal injury , death or substantial property damage. Installation must c omply with local requirements and with the N ational Fuel Gas Code, ANSI Z223.1 for U .S. installations or CSA B[...]

26 4 V er tical dir ect v enting V ent/air ter mination – v er tical Prepar e roof penetr ations 1. Air pipe penetr ation: a. Cu t a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diamet er . 2. V ent pipe penetration: a. C ut a hole for the vent pipe. For either combustible or nonc ombustible constructi[...]

27 4 V er tical dir ect v enting (continued) V er tical ter mination – optional concentric v ent Description and usage Lochin var offers an optional conc entric combustion air and vent pipe t ermination kit. Both combustion air and v ent pipes must attach to the t er mination kit. The termination kit must terminate outside the structure and must [...]

28 4 V er tical dir ect v enting V er tical ter mination – optional concentric v ent Figure 4-6 Concentric V ent Roof Installation Ensure termination height is abov e the roof surface or anticipated snow level (12 inches in U .S.A. or 18 inches in Canada) as shown in FIG. 4-4, page 27. If assembly is too shor t to meet height requirement, the two[...]

29 The Shield water heater ma y be installed w ith a single pipe carr y ing the flue products t o the outside while using combustion ai r from the equipment r oom. The vent pipe ma y terminate either vertically (FIG. 5-1) abo ve the r o of line in a conv entional vent manner or on a sidewall (FIG. 5-2). Follo w the requirements in the General V ent[...]

30 6 System piping System wa ter piping methods Obser ve a minimum of one inch clearance around all un-insulated hot water pipes when openings ar ound the pipes are not pr otected by non-c ombustible materials. 2. I f this water heat er is installed in a closed water supply system, such as the one having a backflow prevent er in the cold water supp[...]

31 6 System piping (continued) See the *piping illustrations included in this section, FIG. ’ s 6-2 thru 6-4 for suggested guidelines in piping the Shield water heater . *Please note that these illustrations are meant to show syst em piping concept only , the installer is responsible for all equipment and detailing required b y local cod es. NOTI[...]

32 6 System piping COLD WA TER SUPPL Y FLOW CHECK V AL VE (TYPICAL) BUILDING RETURN MIXING V AL VE BALL V AL VE (TYPICAL) UNION (TYPICAL) HOT W A TER SUPPL Y EXP ANSION TA N K SYSTEM CIRCULA TOR Figure 6-2 Single Unit Installation & Service Manual TM[...]

33 6 System piping (continued) MIXING VA LV E BALL V AL VE (TYPICAL) HOT W A TER SUPPL Y UNION (TYPICAL) SYSTEM CIRCULA TOR BUILDING RETURN EXP ANSION TA N K FLOW CHECK V AL VE (TYPICAL) COLD W A TER SUPPL Y Figure 6-3 Multiple Units Installation & Service Manual TM[...]

34 6 System piping FLOW CHECK VALVE (TYPICAL) BALL VALVE (TYPICAL) EXPANSI ON TANK THE RMOMET ER (TYPICAL) COLD WAT E R SUPPLY 140° HOT WAT E R SUPPLY HIGH TEMPE RATURE BUILDING RETURN UNION (TYPICAL) LOW TEMPERA TURE BUILDING RETURN 180° HOT WAT E R SUPPLY MIXING VALVE Figure 6-4 T wo T emperature - Single Unit Installation & Service Manual [...]

35 7 Gas connections Connecting gas supply piping 1. Install ground joint union for serv icing, when requ ired . 2. On Models SNR150-100 -- SN A285-125 install a manual shutoff valve in the gas supply piping outside water heat er jacket when r equired by local c odes or utilit y requirements. 3. In Canada – When using manual main shut off valv es[...]

36 Failure t o apply pipe sealing compound as detailed in this manual can result in sev ere personal injur y , death, or substantial property damage. Shield water heaters ar e t ypically shipped ready t o fire on natural gas. Check the water heater rating plate t o determine which fuel the water heat er is set for . In order to operate on LP gas c [...]

37 Nominal Iron Pipe Size (Inches) Natural Gas Pipe Cap acity Chart Length of Pipe in Straight Feet for 1/2 PSI 10 20 30 40 50 60 70 80 90 100 125 150 175 200 1/2 175 120 97 82 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 3/4 369 256 205 174 155 141 128 121 11 3 106 95 86 79 74 1 697 477 384 328 292 267 246 236 210 200 179 164 149 138 1-1/4 1400 974 789[...]

38 7 Gas connections Gas pressur e The gas pressure m ust remain between 4 inc hes w .c. (natural), 8 inches w .c. (LP) minimum and 14 inches w .c. (natural and LP) maximum during stand-by (static) mode and while in operating (dynamic) mode. If an in-line regulator is used, it must be a minimum of 10 feet from the Shield water heater . It is v ery [...]

39 8 Field wiring ELECTRICAL SHOCK HAZARD – For your safety , turn off electr ical powe r supply before making an y elec trical connections t o av oid possible electr ic shock hazard. Failure to do so can cause severe personal injury or death. W ir ing must be N.E.C. Class 1. If or iginal wir ing as supplied with the water heater m ust be replace[...]

40 8 Field wiring Figure 8-3 Low V oltage Field Wiring Connections BUILDING MANAGMENT SYSTEM ALARM BELL LOW WA TER CUTOFF Installation & Service Manual TM[...]

8 Field wiring (continued) 41 Figure 8-4 Control Inputs/Output s T ANK SENSOR LOW VOL T AGE CONNECTI ON BOARD INLET TEMPERA TURE SENSOR OUTLET TEMPERA TURE / HIGH LIMIT SENSO R FLUE GAS SENSOR FLAME SENSOR LOW WA TER CUTOFF BLOCKED DRAI N SW ITCH D I S P L AY PA N E L CONTROL BOARD BLOCKED AIR INLET PRESSURE SWITCH LOW VOL T AGE CONNECTI ON BOARD C[...]

42 9 Condensa te disposal Condensate drain 1. This water heater is a high efficiency appliance that produces c ondensate. 2. Slope condensate tubing do w n and awa y from the water heater into a drain or condensat e neut ralizing filter . Condensate fr om the Shield water heater will be slig htly acidic (ty pically with a pH from 3 to 5). Install a[...]

43 10 Star t-up Chlorine concentration less than 200 ppm 1. Do not fill the water heater or operate with water containing chlorine in ex cess of 200 ppm. 2. Filling with chlorinated fresh water should be acc eptable since drinking water chlorine levels ar e much low er . 3. Do not use the water heater t o directly heat sw imming pool or spa water .[...]

44 10 Star t-up Star t the water hea ter 1. Read and follo w the Operating inst ructions in FIG. ’ s 10-2 and 10-3, pages 45 and 46. If wa ter heater does not star t cor rectl y 1. Check for loose connections, blown fuse or ser vice switch off. 2. I s external limit co ntrol (if used) open? Is water temperature abo ve 200°F? 3. Is tank set point[...]

45 Figure 10-2 Operating Instructions - Models SNR150-100 -- SNA285-125 10 Star t-up (continued) Installation & Service Manual TM[...]

46 Figure 10-3 Operating Instructions - Models SNA400-125 -- SNA500-125 10 Star t-up Installation & Service Manual TM[...]

47 11 Oper a ting infor mation General How the w ater heater operates The Shield water heater c ombines an advanced stainless steel heat ex changer , elect ronic c ontrol module, and tank that allows fully c ondensing operation. The blo wer pulls in air and pushes flue products out of the heat exchanger and flue piping. The c ont rol module r egula[...]

48 Wa ter heater temperature r e gula tion Operating temperature (t arget) The electronic contr ol module senses water temperature in the tank and regulates wat er heater ignition and firing rate to achieve a target t emperature. The target temperature can be set between 60°F and 185°F . High limit operations W hen the heat ex changer outlet temp[...]

49 11 Oper a ting infor mation (continued) OPERATION DISPLAY 1. When the tank temperature falls below the set point minus the differential, the control will st art the burner . HTR: Standby TANK: 123.8F(129) 2. The control connects 120 V AC to the blower . The blower does not run at this time. • The manual reset high limit must be closed before t[...]

50 Shield control module • Press once to go into Menu Mode • Press again to exit Menu Mode • Press to toggle between digits when entering the hour , minutes, etc., or when entering date and time Figure 1 1-1 Control Panel U se the control panel (FIG. 11-1) to set temperatures, oper ating conditions, and monitor water heater operation. 11 Oper[...]

51 11 Oper a ting infor mation (continued) Status Display Screens By using the Pr e vious/Ne xt (  ,  ) arrow k e ys on the electronic c ontrol module displa y panel, you can na v igate thr ough the fiv e (5) display scr eens. Each screen will contain tw o (2) v iewable items. The following is a descr iption of the individual i tems and what [...]

52 11 Oper a ting infor mation Status Display Screens (cont ’ d) By using the Pr e vious/Ne xt (  ,  ) arrow k e ys on the electronic co ntrol module displa y panel, you can na v igate through the fiv e (5) display scr eens. Each screen will contain tw o (2) v iewable items. The following is a descr iption of the individual i tems and what [...]

53 12 Maintenance Maintenance and annual star tup T able 12A Service and Maintenance Schedules Ser vice tec hnician (see the following p ages for instructions) General: • Address reported problems • Inspect interior; clean and vacuum if necessary; • Clean condensate trap and fill with fresh water • Check for leaks (water , gas, flue, conden[...]

54 12 Maintenance Follo w the ser vice and maintenance proc edures given throughout this manual and in c omponent literature shipped with the water heater . Failure to perform the serv ice and maintenanc e could r esult in damage to the water heater or syst em. Failure t o follow the directions in this manual and component literature c ould result [...]

55 12 Maintenance (continued) Flue vent system and air piping 1. Visually inspect the entire flue gas v enting system and air piping for blockage, deterioration or leakage. R epair any joints that show signs of leakage. V erify that air inlet pipe is connected and pr operly sealed. 2. V erify that water heater vent discharge and air intak e are cle[...]

56 12 Maintenance Inspect ignition and flame sense electrodes 1. Re mov e the ignition and flame sense electrodes from the water heater heat e xc hanger access c over . 2. Remov e any deposits ac cumulated on the ignition/flame sense electrode using sandpaper . I f the electrodes cannot be cleaned satisfactorily , replace with new ones. 3. Replac e[...]

57 12 Maintenance (continued) Cleaning heat e xc hanger 1. Shut do w n water heater: • Follo w the “ T o T urn Off Gas to A ppliance” inst ructions for the water heater on pages 45 and 46. • Do not dr ain the water heat er unless it will be exposed to freezing t emper atures. 2. Allo w time for the water heater t o cool to r o om temperatur[...]

58 13 T roubleshooting Label all wires prior to disconnection when serv icing controls. W iring er rors can cause improper and danger ous operation. Always disc onnect power t o the water heater befor e ser v icing. Failure t o comply c ould result in sever e personal injur y , death, or substantial property damage. Nev er jumper (by pass) an y dev[...]

59 13 T roubleshooting (continued) T able 13A T roubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION No Display - No 120 V AC supplied to unit. • Check external line switch, fuse, or breaker . • Check wiring harness connection between display board and main control board. Connect harness at both points. - Bad display board. • Repla[...]

60 13 T roubleshooting T able 13B - Inlet/Outlet T ank Sensor Resist ance vs. T emperature T emperature °F Resist ance Ω T emperature °F Resistance Ω 50 18,780 158 1,990 68 12,263 176 1,458 86 8,194 194 1,084 104 5,592 212 817 122 3,893 -- -- 140 2,760 -- -- T able 13C - Flue T emperature Sensor Resist ance vs. T emperature T emperature °F Res[...]

61 13 T roubleshooting (continued) T able 13D T roubleshooting Chart - Noisy System FAULT CAUSE CORRECTIVE ACTION Noisy Operation - Supply gas problem. Natural gas pressures should be between 4 inches w .c. and 14 inches w .c. LP gas pressures should be between 8 inches w .c. and 14 inches w .c. • Refer to Section 7 - Gas Connections for detailed[...]

62 13 T roubleshooting T able 13E T roubleshooting Chart - Fault Messages Displayed on Water Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION Flame Sequence (will require a manual reset once the c ondition has been correct ed. Press the RESET butt on on the display to r eset.) The flame detector circuit is seeing a flame signal while no flame i[...]

63 13 T roubleshooting (continued) T able 13E (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on W ater Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION No Flam e Running (will require a manual reset once the condition has been corrected. Press the RESET button on the display to reset.) The unit was running and [...]

64 13 T roubleshooting T able 13E (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on W ater Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION Manual Reset High Limit (will require a manual reset once the c ondition has been correct ed. Press the RESET button on the display to reset.) The outlet water temperature [...]

65 13 T roubleshooting (continued) T able 13E (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on W ater Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION F an High OR F an Speed High (will require a manual reset once the c ondition has been correct ed. Press the RESET button on the display to reset.) The actual f[...]

66 13 T roubleshooting T able 13E (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on W ater Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION T emp O/Shoot (continued) The temperature rise across the heat exchanger has exceeded the set parameters for the water heater . • V erify that the system is full of water[...]

67 13 T roubleshooting (continued) T able 13E (continued from previous page) T roubleshooting Chart - Fault Messages Displayed on W ater Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION Ser vice Blk While the unit is in Service Mode, the outlet temperature has exceeded 185°F . • Establish a draw to remove HW heat from the water heater . • [...]

68 13 T roubleshooting Combustion Analysis Pr ocedur e 1. Press the SHUTDO WN button on the display until HTR:Off appears in the display window . 2. Re mov e the screws securing the top panel to the unit. Re mov e the panel from the unit to gain ac cess to the flue sensor . 3. Locate the flue sensor in the top of the vent co nnection. Re move the f[...]

69 13 T roubleshooting (continued) Gas valv e adjustment pr ocedur e If adjust ment of the gas valve is deemed necessary , use the following procedur es: ( No t e: The procedures belo w are model specific.) Models SNR150-100 -- SNA285-125 Locate the throttle adjustment scr ew on the side of the venturi valv e (FIG. 13-2). Using a scr ewdr iv er , t[...]

70 14 Diag r ams BOX DEPICTS OPTIONAL ITEMS LADDER DIAGRAM LBL20026 REV A 120 VAC 24 VA C 120VAC TERMINAL STRIP 120V SUPPL Y "L" X1-6 DHW PUMP RELAY BLOWER RELAY X1-3 X1-1 DHW PUMP "L" DHW PUMP DHW PUMP "N" 12 3 BLOWER JUNCTION BOX X1-5 X6-8 X6-3 F5 X5-7 X6-7 NEUTRAL CN2-4 CN2-10 CONNECTION BOARD CN2-6 CN5-1 TERMINAL S[...]

71 14 Diag r ams (continued) DISPLA Y X1- 8 X5- 5 X5- 13 X5- 6 X5- 12 INTEGRA TED CONTROL BLOWER X1- 1 X2- 2 X2- 1 X1- 7 GAS VA LV E FLAME ROD SP ARK ROD W/ R G R R T W BK G R 13 2 W G BOX DEPICTS OPTIONAL ITEMS WIRING DIAGRAM LBL20025 REV A W ARN ING DISCO NNECT POWER BEFORE SER VICING INLET SENSOR OUTLET SENSOR FLUE SENSOR MANUAL RESET HI-LIMIT B[...]

Revision Notes: Revision A (ECO #C02299) initial release. Revision B (ECO #C02870) reflects the addition of a mixing valve to the piping diagrams (FIG .’s 6-2 and 6-3, pgs. 32 - 34). Revision C (ECO #C02738) reflects edits made to the Gas V alve Adjustment Procedure for Model SNA400-125 on page 69. Revision D (ECO #C03223) reflects edits made to [...]