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Operating
This water heater is equipped with an electrically operated
venting system and electronic control. For the burner to
come on, the water heater thermostat must call for heat.
Then the system will begin sequencing, each section prov-
ing itself before gas is allowed to flow to the burner.
BEFORE THE WATER HEATER WILL OPERATE:
1. The control system must be connected to a grounded
110/120 volt power supply. The control system has an
overall rating of 2 amps. The water heater must be
securely and adequately grounded in accordance with
local codes and with the current edition of the National
Electrical Code ANSI/NFPA 70.
2. The ON/OFF rocker switch, located on the control box
above the thermostat must be in the “ON” position for
the electrical control system to operate allowing the gas
portion to operate (ignite burner).
3. The venting manual reset switch must be in the closed
position. See “Venting Manual Reset Switch” in the “For
Your Information” section.
4. There is a non-resettable hi-limit switch in the thermo-
stat, which must be good (closed) for the thermostat to
be operated. See “High Temperature Shut Off System”
in the “For Your Information” section.
75 GALLON 70,000 AND 75,000 BTU/HR,
50 GALLON 52,500, 55,000 AND 62,500 BTU/HR,
AND 40 GALLON 50,000 BTU/HR MODELS ONLY
OPERATION
When the thermostat calls for heat, gas is allowed to flow
to a (N/O) pressure switch closing it. An electrical circuit is
then made to the blower, turning it on. When the blower
has achieved sufficient venting, the air pressure switch will
close. A 120 volt circuit will be completed through the
venting manual reset switch and on to the 120 volt gas
valve. The 120 volt gas valve will open allowing gas to
flow to the burner. The hot surface ignitor will establish a
main burner flame.
ALL 40 GALLON AND 50 GALLON 40,000 BTU/HR
MODELS ONLY
25
BLOWER MOTOR
AIR PRESSURE
SWITCH
DRAFT HOOD
ON/OFF SWITCH
VENTING MANUAL
RESET SWITCH
BURNER
120V GAS VALVE
HOT SURFACE
IGNITOR
AIR PRESSURE
SWITCH
ON/OFF SWITCH
BLOWER MOTOR
VENTING MANUAL
RESET SWITCH
DRAFT HOOD
ALL MODELS
DILUTION AIR
INTAKE
DILUTION AIR
INTAKE