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OPERATING INSTRUCTIONS
This water heater is equipped with an electronically 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 proving 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
“Troubleshooting” section.
4. There is a non-resettable hi-limit switch in the thermostat,
which must be good (closed) for the thermostat to be
operated. See “High Temperature Limit Switch” in the
“Troubleshooting” section.
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 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.
FIGURE 51.
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