American Water Heater Heavy Duty Commercial Gas BCG3 User Manual

21
grounding shall be done in accordance with the current edition 
of the Canadian Electrical Code CSA C22.1 and/or local codes.
VENT INSTALLATION
Seal  all  joints  between  the  power  venter  and  the  vent 
termination.  This  is  to  prevent  leakage  of  exhaust  products 
into the room(s) due to positive pressure of blower.
The “Sequence of Operation” description will be the same with 
mechanical venting except;
When the water heater thermostat calls for heat:
Thermostat  contacts  “Close”  and...

22
This  water  heater  is  provided  with  a  properly  rated/sized  and 
certified combination temperature - pressure (T&P) relief valve by 
the manufacturer. See Temperature-Pressure Relief Valve on pages 
14-15 for information on replacement and other requirements.
Water Damage Hazard
Temperature-Pressure Relief V alve discharge
pipe must terminate at adequate drain.
CAUTION
Install  a  discharge  pipe  between  the  T&P  valve  discharge 
opening  and  a  suitable  floor  drain.  Do  not  connect...

23
HEATER WIRING
All electrical work must be installed in accordance with the current edition of the National Electrical Code ANSI/NFPA No. 70 or Canadian Electrical 
Code CSA C22.1 and must conform to all local code authority having jurisdiction.  AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF 
ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION.
If any of the original wire as supplied with the water heater must be replaced, use only type 105°C thermoplastic or equivalent 250
0C type F must be 
used for the...

24
GAS PIPING
Contact  your  local  gas  service  company  to  ensure  that  adequate 
gas  service  is  available  and  to  review  applicable  installation  codes 
for your area.
Size the main gas line in accordance with Table 7. The figures shown 
are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is 
considered normal for low pressure systems. Note: Fittings such as 
elbows,  tees  and  line  regulators  will  add  to  the  pipe  pressure  drop. 
Also refer to the latest version of...

25
 is locked out, the power to the unit must be cycled to restart the 
  Ignition Control.
8.  If  the  pilot  flame  is  proved  during  the  ignition  trial  period,  the 
  Ignition  Control  turns  off  the  Spark  Ignitor  and  opens  the  Main 
  Gas Valve.
9.  The  Ignition  Control  allows  a  2  second  pilot  flame  stabilization  
  period  to  insure  that  the  pilot  flame  is  not  extinguished  by  the 
  main burner light-off process.
10.  The  Ignition  Control  monitors  the  Flame...

26
SEQUENCE OF OPERATION FLOW CHART
Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 25.
FLOW CHART 1.
A
A
IDLE
(NOT  POWERED)
“CALL  FOR HEAT ”
RECEIVED FROM THERMOSTAT
POWER  TO
MODULE  AND
SELF CHECK
TRIAL  FOR
IGNITIO N
(TIMER ST ARTED)
FLAME
PROVED? CLOSE PILOT
GAS VA LVE SP
ARK OFF
(BEFORE  TRIAL FOR IGNITION  TIMER EXPIRES)
SP ARK OFF
OPEN MAIN GA S
VA LVE
FLAME
ST ABILIZA TION
(2 SECONDS)
RUN NO
NO
NO
YES
YES
YES
“CALL
FOR HEAT ”
ENDS? FLAME
LOST?...

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LIGHTING & OPERATION LABEL
FIGURE 22. LABEL FOR NATURAL GAS MODELS
FOR YOUR SAFETY READ BEFORE OPERATINGOPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE OPERATING  

28
FIGURE 23. LABEL FOR PROPANE GAS MODELS
FOR YOUR SAFETY READ BEFORE OPERATINGOPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE  

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ADJUSTMENTS
ON INITIAL STARTUP SOME ADJUSTMENTS MAY BE NECESSARY.
Check  Manifold  and  inlet  gas  pressures  (see  GAS  SUPPLY 
SYSTEMS on page 13 and CHECKING THE INPUT on page 29-30.)
Check Pilot Burner (See Pilot Burner section on page 34.)
TESTING DAMPER OPER ATION
With  the  Service  Switch  in  the  AUTOMATIC  OPER ATION 
position, check the operation of the flue damper three (3) times 
with the water operating controls for proper operating sequence:
• The damper disc must be open (in the...

30
FIGURE 24.
UNDER  NO  CIRCUMSTANCES  SHOULD  THE  GAS  INPUT  EXCEED 
THE  INPUT  SHOWN  ON  THE  HEATER  MODEL  AND  RATING 
PLATE.  OVERFIRING  COULD  RESULT  IN  DAMAGE  OR  SOOTING 
OF  THE  HEATER.
Should it be necessary to adjust the gas pressure to the burners to obtain the full input rate, the steps below should be followed:
3.   Remove the regulator adjustment sealing cap and adjust the pressure  
by turning the adjusting screw with a screwdriver. See Figure 24.
 
 Clockwise to increase gas...