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FOR MODELS WITH AUTOMATIC GAS VALVES
1. Close all gas valves. Turn off electric power
supply. Wait five (5) minutes.
2. Open manual pilot valve. Turn on electric
power. Pilot is automatically lighted.
3. Open main gas valve.
4. Set temperature controls to desired temperature.
TO SHUT DOWN
Close all manual gas valves. Turn off electric
power.
33
GAS INLET
PILOT SHUT-OFF
VALVE CONTROL
SHOWN IN "ON"
POSITION
TO PILOT
MAIN GAS
SHUT-OFF
VALVE
SHOWN IN
THE "ON"
POSITION
1. Turn on power to the ignition systems and turn
gas supply off.
2. Check ignition module as follows:
a. Set the thermostat or controller above
room temperature to call for heat.
b. Watch for continuous spark at the pilot
burner.
c. Time the spark operation. Time must be
within the lockout timing period (15 or 90
seconds).
d. Turn thermostat down to end call for heat
and wait 60 seconds on lockout models
before beginning step 3.
AFTER START-UP
3. Turn on gas supply.
4. Set thermostat or controller above room temp-
erature to call for heat.
5. Systems should start as follows:
a. Spark will turn on and pilot gas valve will
open at once. Pilot burner should ignite
after gas reaches the pilot burner.
b. Spark ignition should cut-off when pilot
flame is established.
c. Main gas valve should open and main
burner should ignite after gas reaches the
burner port.
INTERMITTENT PILOT SYSTEM CHECKOUT PROCEDURE (S8600)
BURNERS
Clean main burners and air louvers free of dust, lint
and debris. Keep heater area clear and free from
combustibles and flammable liquids. Do not obstruct
the flow of combustion and ventilation air. Make visual
check of burner and pilot flame. Yellow flame indicates
clogging of air openings. Lifting or blowing flame indi-
cates excessively high gas pressure. Low flame indi-
cates low gas pressure.
CONTROLS
Check all controls to see that they are operational.
To check electronic safety (IID models), turn off main
burner. Observe pilot burner when shutting off pilot
gas. Ignition spark should go on. Main gas valve will
also drop out.
High Limit Switch - to check high limit switch, turn
dial setting down to a point slightly below the tempera-
ture of the water leaving the heater. The reset button
should snap out and the burner should shut-off. Reset
dial to 30°F to 40°F above desired operating tempera-
ture and push reset button. Burner should light.
INSPECTION PROCEDURES
TYPICAL MAIN BURNER FLAME (Atmospheric models)
NOTE: Modulating burner flame varies in height from
approximately 1/4" at low fire to approximately 4" at
high fire.
Fig# 8144
Fig# 8220