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SYSTEM CONTROL CHECK OUT PROCEDURES
1. Adjust the thermostat to call for heat and observe the power venting system for proper sequence of
operation: (Repeat if necessary).
a. Thermostat calls for heat.
b. Relay is energized, post purge timer is energized, and venter motor starts.
c. Pressure switch closes and burner starts.
d. Thermostat is satisfi ed, relay is de-energized, burner stops and post purge timer operates venter motor
for approximately 3 to 5 minutes.
2. While system is operating, disconnect power to the venter motor. This should open the pressure switch
contacts and stop burner operation.
3. (If WMO-1 switch is installed) Allow vent system to cool. Disconnect the vent pipe between the venter
inlet and the appliance outlet. Block the vent pipe with a noncombustible material. Activate the heating
system with the main burner operating. Allow approximately 2 minutes or less for the secondary safety
switch to deactivate the burner. Reset safety switch and repeat.
MAINTENANCE
1. Motor: Inspect motor once a year; the motor should rotate freely.
2. Wheel: Inspect venter wheel annually, for oil fi red heating systems, clear any soot, ash or coating which
inhibits either rotation or air fl ow. Remove all foreign material before operating.
3. Vent System: Inspect all vent pipe connections annually for looseness and for evidence of fl ue gas
leakage. Seal or tighten pipe connections if necessary.
TROUBLE SHOOTING HINTS
1. Main burner does not fi re when thermostat calls for heat with venter operating.
a. Check pressure switch adjustment.
b. Check fuel fl ow.
c. Check wiring connections between pressure switch and burner.
d. Check pressure switch for continuity across terminals, during venter operation.
2. Venter does not activate when thermostat calls for heat.
a. Jump wire the terminals L1 and M to ensure motor operation.
b. Check wiring.
3. Flue gas odor.
a. Check system draft.
b. Check post purge venting time.
c. Check for negative pressure in building.
page 7
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