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American Water Heater AHCG3/HCG3100T250 - page 1
1 PLACE THESE INSTRUCTIONS ADJACENT TO HEA TER AND NOTIFY OWNER T O KEEP FOR FUTURE REFERENCE. PRINTED 0608 198154-000 HIGH EFFICIENCY AHCG3/HCG360T120 thru AHCG3/HCG3100T250 COMMERCIAL GAS W A TER HEA TER GAS-FIRED POWER BURNER FOR DOMESTIC HOT W A TER Thank you for buying this energy efcient water heater from American W ater Heaters. We apprec ...
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American Water Heater AHCG3/HCG3100T250 - page 2
2 These designs comply with the current version of the American National Standard for Gas Water Heaters, V olume III, ANSI Z21.10.3 / CSA 4.3 as an automatic circulating tank water heater , and automatic storage water heaters. Detailed installation diagrams are found in this manual. These diagrams will serve to provide the installer with a referenc ...
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American Water Heater AHCG3/HCG3100T250 - page 3
3 DANGER THIS W A TER HEA TER IS EQUIPPED WITH AN ADJUST ABLE THERMOST A T TO CONTROL WA TER TEMPERA TURE. HOT WA TER TEMPERA TURES REQUIRED FOR AUTOMA TIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESUL TING IN SERIOUS PERSONAL INJURY AND/OR DEA TH. THE TEMPERA TURE A T WHICH INJURY OCCURS V ARIES WITH THE PERSON’S AGE AND THE TIME OF THE ...
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American Water Heater AHCG3/HCG3100T250 - page 4
4 temperature be set for the lowest temperature which satises your hot water needs. This will also provide the most energy efcient operation of the water heater and minimize scale formation. SETTING THE WA TER HEA TER TEMPERA TURE A T 120°F/49°C WILL REDUCE THE RISK OF SCALDS. Some states require settings at specic lower temperatures. Fi ...
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American Water Heater AHCG3/HCG3100T250 - page 5
5 LOCA TING THE HEA TER W ARNING THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS GAS WA TER HEA TERS IN ROOMS, GARAGES OR OTHER AREAS WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED, OPERA TED OR REP AIRED. FLAMMABLE V APORS ARE HEA VY AND TRA VEL ALONG THE FLOOR AND MA Y BE IGNITED BY THE HEA TER? ...
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American Water Heater AHCG3/HCG3100T250 - page 6
6 If the conned space is within a building of tight construction, air for combustion and ven til at ion mus t be o bta ine d fr om o utd oor s. When dire ct ly co mm uni cat in g with the outdoors through vertical ducts, two permanent openings, located in the above manner , shall be provided. Each opening shall have a free area of not less than ...
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American Water Heater AHCG3/HCG3100T250 - page 7
7 For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7 ...
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American Water Heater AHCG3/HCG3100T250 - page 8
8 FIGURE 5a. U.S. POWER VENT CANADIAN POWER VENT FIGURE 5b. CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULA TING T O THE AIR INT AKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DIST ANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. ...
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American Water Heater AHCG3/HCG3100T250 - page 9
9 FIGURE 6a. U.S. DIRECT VENT CANADIAN DIRECT VENT FIGURE 6b. CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULA TING T O THE AIR INT AKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DIST ANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. ...
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American Water Heater AHCG3/HCG3100T250 - page 10
10 IMPORT ANT The vent system must terminate so that proper clearances are maintained as cited in local codes or the current editions of the National Fuel Gas Code, ANSI Z223.1/NFP A 54 or the Natural Gas and Propane Installation Code, CAN/CSA-B149.1. Do no t te rmi nat e the exh aus t ven t te rmi nal over publ ic area wher e co nde nsa te or vapo ...
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American Water Heater AHCG3/HCG3100T250 - page 11
11 5. Glue the intake vent terminal to the section of the pipe. 6. Slide the wall plate over the pipe to stop against intake vent terminal. 7. Place a bead of caulking (not supplied) around the gap between the pipe and the wall. Place some of the caulking on the back of the plate to hold it against the wall after installation. 8. If the vent pipe i ...
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American Water Heater AHCG3/HCG3100T250 - page 12
12 Propane Installatio n Code which requ ires the vent syst em components be certied to ULC S636. This water heater has been design certied to be vented with PVC pipe certied and marked as complying with ULC S636. This water heater is supplied with a 2 inch 22.5 degree termination elbow that is a special tting that must be used with the ...
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American Water Heater AHCG3/HCG3100T250 - page 13
13 LOW GAS PRESSURE SWITCH (SEE FIGURE 12) The Low Gas Switch (LGS) is a single-pole, normally open pressure switch that will close its contacts when a rising pressure of 5.0 in. (1.25Kpa) W .C. is encountered. The contacts will open when the pressure falls below the xed set point of 4.8"WC (1.18Kpa) for natural gas models and 8.5"WC ( ...
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American Water Heater AHCG3/HCG3100T250 - page 14
14 W ARNING THE HEA TER IS NOT INTENDED FOR OPERA TION A T HIGHER THAN 10.5" (2.59 KPa) WA TER COLUMN SUPPL Y GAS PRESSURE. HIGHER GAS SUPPL Y PRESSURES REQUIRE SUPPLEMENT AL REDUCING SERVICE REGULA TION. EXPOSURE TO HIGHER GAS SUPPL Y PRESSURE MA Y CAUSE DAMAGE TO THE GAS CONTROLS WHICH COULD RESUL T IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS ...
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American Water Heater AHCG3/HCG3100T250 - page 15
15 DISCONNECT THE APPLIANCE AND ITS MANUAL GAS SHUTOFF V AL VE FROM THE GAS SUPPL Y PIPING SYSTEM DURING ANY SUPPL Y PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45Kpa). GAS SUPPL Y LINE MUST BE CAPPED WHEN DISCONNECTED FROM THE HEA TER. FOR TEST PRESSURES OF 1/2 PSIG (3.45Kpa) OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLA TED FROM T ...
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American Water Heater AHCG3/HCG3100T250 - page 16
16 CON DIT IO NER MUST BE INST ALLED IF THE ABO VE C OND ITI ONS EXI ST . MALFUNCTIONS CAUSED BY A POOR ELECTRICAL SUPPL Y ARE NOT COVERED UNDER YOUR W ARRANTY . The controller is wired to the heater as shown in Figure 15. The model and rating plate provides the electrical information needed to size the complete heater branch supply . All electrica ...
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American Water Heater AHCG3/HCG3100T250 - page 17
17 USING THE ELECTRONIC CONTROLLER 1. Overview Interaction with the water heater controller is done through an up, a down, and three operation buttons. These buttons are illustrated to the right. Operation of the three lower buttons is dened immediately above them on the screen. The [UP] and [DN] buttons are used to navigate through the menus an ...
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American Water Heater AHCG3/HCG3100T250 - page 18
18 3. Adjusting the Operating Set Point The Operating Set Point of this water heater determines the regulated temperature for the water in the tank. This parameter is adjusted in the T emperature menu. Items in this menu allow you to monitor dif ferent tem - perature readings in the tank along with adjusting the Operating Set Point and Differential ...
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American Water Heater AHCG3/HCG3100T250 - page 19
19 4. Changing the Display Units The display interface to the heater has the option of selecting between de - grees Fahrenheit and degrees Celsius for temperature displays. This can be found in the “Display Settings” menu. Also in this menu, you may adjust how the backlight operates and the contrast of the LCD screen. ACTION: From the Main Menu ...
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American Water Heater AHCG3/HCG3100T250 - page 20
20 ACTION: T o get to the current fault information screen, press Menu. DISPLA Y : ACTION: Press the DOWN button to highlight "current Fault" and press Select. DISPLA Y : ACTION: Press the DOWN button for more information. DISPLA Y : 7. Viewing the Fault History The controller for this water heater will store a history of ten of the last ...
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American Water Heater AHCG3/HCG3100T250 - page 21
21 5. Check the vent system seams and joints and ensure that there is no discharge of ue products into the room. 6. Check the input rate. For appliance installation locations with elevations above 6500 feet (1982 meters) refer to HIGH AL TITUDE INST ALLA TIONS section of this manual. a. Attach a pressure gauge (manometer) to the manifold pressur ...
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American Water Heater AHCG3/HCG3100T250 - page 22
22 W ARNING UNDER NO CIRCUMS T ANCES SHOULD THE INP UT EXCEE D THE RA TE SHOWN ON THE HEA TER RA TING PLA TE. OVER FIRING COULD RESUL T IN DAMAGE OR SOOTING OF THE HEA TER. CA THODIC PROTECTION CAUTION HY DROG EN GA S C AN BE PR ODUC ED IN A HO T WA T ER SY STEM SERVED BY THIS HEA TER THA T HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALL Y TW ...
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American Water Heater AHCG3/HCG3100T250 - page 23
23 FOR YOUR SAFETY READ BEFORE OPERA TING W ARNING: If you do not follow these instructions exactly , a re or explosion may result causing property damage, personal injury or loss of life. AHCG3/HCG360T120 MODELS ONL Y . ...
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American Water Heater AHCG3/HCG3100T250 - page 24
24 FOR YOUR SAFETY READ BEFORE OPERA TING W ARNING: If you do not follow these instructions exactly , a fire or explosion may result causing property damage, personal injury or loss of life. AHCG3/HCG3100T150 MODELS ONLY. OPERA TING INSTRUCTIONS TURN OFF GAS TO APPLIANCE ...
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American Water Heater AHCG3/HCG3100T250 - page 25
25 AHCG3/HCG3100T199 & AHCG3/HCG3100T250 MODELS ONL Y . OPERA TING INSTRUCTIONS TURN OFF GAS TO APPLIANCE FOR YOUR SAFETY READ BEFORE OPERA TING W ARNING: If you do not follow these instructions exactly , a re or explosion may result causing property damage, personal injury or loss of life. OPERA TING INSTRUCTIONS TURN OFF GAS TO APPLIANCE ...
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American Water Heater AHCG3/HCG3100T250 - page 26
26 FIGURE 16. T o dissolve and remove the more stubborn mineral deposits, manufacturer's UN•LIME® Professional Delimer should be used. The manufacturer's UN•LIME® Professional Delimer is an easy to handle patented food grade acid formulated specically for lime scale removal from all types of water using equipment. Available in 1 ...
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American Water Heater AHCG3/HCG3100T250 - page 27
27 DRAIN V AL VE AND ACCESS P ANELS The heaters are equipped with a 3/4" drain valve. An access panel covers the cleanout opening in the tank which is sealed by a gasket and cover , gure 25. RELIEF V AL VE At least twice a year , the temperature and pressure relief valve should be checked to ensure that it is in operating condition. T o che ...
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American Water Heater AHCG3/HCG3100T250 - page 28
28 ONE TEMPERA TURE - ONE HEA TER HORIZONT AL ST ORAGE T ANK FORCED CIRCULA TION WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE A T FIXTURES. SEE WA TER TEMPERA TURE CONTROL WARNING ON P AGE 4 . I F HI G HE R P RE HE AT T EM P ER A TU R ES A RE NECESSARY TO OBT AIN ADEQUA TE BOOSTER OUTPUT , ...
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American Water Heater AHCG3/HCG3100T250 - page 29
29 * PIPE RELIEF V AL VE T O OPEN DRAIN. NOTE: I F T E M P E R E D W A T E R I S RECIRCULA TED, RETURN LINE SHOULD BE CONNECTED A T POINT “A”. INST ALL IN ACCORDANCE WITH LOCAL CODES. TWO TEMPERA TURE - ONE HEA TER HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE A T FIXTU ...
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American Water Heater AHCG3/HCG3100T250 - page 30
30 TWO TEMPERA TURE - TWO HEA TERS HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION TWO TEMPERA TURE - THREE HEA TERS (TWO PRE-HEA TERS/ONE BOOSTER HEA TER) WITH OR WITHOUT BUILDING RECIRCULA TION MUST BE IDENTICAL HEA TERS FOR MUL TIPLE HEA TER INST ALLA TION SEE MANIFOLD KIT SPECIFICA TIONS, P AGE 33. CAUTION: IF BUILDING CO LD WA TER S ...
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American Water Heater AHCG3/HCG3100T250 - page 31
31 * PIPE RELIEF V AL VE TO OPEN DRAIN ** 140°F (60°C) TO 150°F (66°C) SHOULD BE MAXIMUM WA TER TEMPERA TURE MAINT AINED IN THE PRE-HEA TERS. 120°F (49°C) SHOULD BE THE MINIMUM TEMPERATURE OF WATER IN THE PRE- HEATERS. CONNECT CIRCULA TING LINE FROM FIXTURES, IF USED, TO COLD W A TER SUPPL Y LINE OF PRE-HEA TER. C O NN E C T C I R CU LA T I N ...
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American Water Heater AHCG3/HCG3100T250 - page 32
32 NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WA TER CIRCULA TION. INST ALL ON OR CLOSE TO DISHWASHER. TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERA TION AND OPEN (OFF) WHEN DISHW ASHER IS NOT OPERA TING OR WHEN ON LONG ST ANDBY . NOTE 2: INST ALL LINE TEMPERA TURE CONTROL IN AN UNINSULA TED TEE BEYOND THE DISHW ASHER T AKEOFF IN THE ...
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American Water Heater AHCG3/HCG3100T250 - page 33
33 MANIFOLD KITS Precision cut type “L” all copper manifold kits assure water ow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water ow may have a shortened life. Dimensions shown are for minimum space occupied by the water heaters ...
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American Water Heater AHCG3/HCG3100T250 - page 34
34 CHECKLIST AND SER VICE INFORMA TION IMPORT ANT The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re-fired after a prolonged shutdown. HOWEVER, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater . B ...
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American Water Heater AHCG3/HCG3100T250 - page 35
35 MOTOR WILL NOT RUN 1. Conrm 120V AC to the controller . Also, to verify correct polarity , check for 120 V AC between hot supply and ground. If there is no voltage, check for a loose connection where it connects to the controller . 2. If there is 120 volts to the controller, check for loose connections or a locked rotor . If the rotor cannot ...
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American Water Heater AHCG3/HCG3100T250 - page 36
36 Commercial Limited W arranty American W ater Heater Company , the warrantor , extends the following LIMITED W ARRANTY to the owner of this water heater . 1. THE T ANK If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the rst THR ...
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American Water Heater AHCG3/HCG3100T250 - page 37
37 NOTES: ...
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American Water Heater AHCG3/HCG3100T250 - page 38
38 NOTES: ...
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American Water Heater AHCG3/HCG3100T250 - page 39
39 NOTES: ...
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American Water Heater AHCG3/HCG3100T250 - page 40
40 PO Box 1597, 500 Princeton Road Johnson City , TN 37605 Phone: 1-800-456-9805 www .americanwaterheater .com ...
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