- 10 -
OPERATING SEQUENCE FOR INTERMITTENT PILOT SYSTEM WITH OR WITHOUT 100%
LOCKOUT DEVICE - STANDARD OUTDOOR (OPTIONAL INDOOR)
1. Set thermostat at lowest setting.
2. Turn on main and pilot manual gas valves.
3. Turn on power to unit.
4. Set thermostat at desired setting.
5. Thermostat calls for heat energizing the pilot gas valve and spark to produce a pilot flame
on each operating cycle. The sensing probe proves the presence of pilot flame and
energizes the safety switch portion of the control. The switch action de-energizes the spark
and energizes the main gas valve.
6. Fan control senses heat exchanger temperature, energizing the blower motor.
7. If the pilot flame is extinguished during main burner operation, the sensing probe detects the
absence of the flame and causes the safety switch to close the main valve and recycle the
spark.
8. For recycling pilot systems with lockout (100% shut off), if the pilot flame is extinguished
during main burner operation, the sensing probe detects the absence of the flame and
causes the safety switch to close the main valve and recycle the spark. If pilot is no
established within the timing cycle of the timing device (10 to 30 seconds), unit locks out and
must be reset by interrupting power to control circuit. (See Lighting Instructions on unit).
OPERATING SEQUENCE - STANDARD OUTDOOR POWER VENTED UNITS
1. Set the thermostat at lowest setting.
2. Turn on main and pilot manual gas valves.
3. Turn on power to unit.
4. Set thermostat so that it calls for heat. This energizes the venter motor, after a time delay
of approximately 15 seconds.
5. Venter flow switch switches to N.O. position and powers the ignition controller.
6. With power supplied to the ignition controller, the pilot gas valve is energized and pilot lights
from igniter.
7. The sensing probe proves the presence of pilot.
(a) Energizes the main gas valve.
(b) De-energizes the spark ignitor.
8. Fan control senses heat exchanger temperature, energizing the blower motor.
9. For recycling pilot systems with lockout device - if the pilot flame is extinguished during main
burner operation the sensing probe detects the absence of the flame and causes the safety
switch to close the main valve and recycle the spark. If pilot is not established within the
timing cycle of the timing device (10 to 30 seconds) unit locks out and must be reset by
interrupting power to control circuit. (See Lighting Instructions on unit).
10. Set thermostat so that it is satisfied.
(a) Main gas valve de-energized.
(b) Pilot gas valve de-energized.
(c) Ignition controller de-energized.
(d) Time delay relay keeps venter motor on for approximately 1
minutes (post purge).
(e) Fan control (optional) keeps blower on while unit is hot.
11. Set thermostat at desired setting.
(10 pages)
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