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PRESSURE SWITCH ADJUSTMENTS
With the venter airflow set and the appliance operating at the best operating
efficiency, adjust the pressure switch by rotating the adjustment screw
clockwise until the burner shuts off, then rotate the adjustment screw
counterclockwise until the burner fires. Rotate the adjustment screw an
additional 1/4 turn counterclockwise to ensure proper switch setting. (See
Figure 5)
SYSTEM CONTROL CHECK OUT PROCEDURES
1. Adjust the thermostat to call for heat and observe the power venting
system for proper operation sequence (Repeat if necessary).
a. Thermostat calls for heat.
b. Relay is energized and venter motor starts.
c. Pressure switch closes and burner starts.
d. Thermostat is satisfied burner and venter motor stop.
2. While system is operating disconnect power to the venter motor. This should open the pressure switch contacts and
stop burner operation.
3. (If GSK-3 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.
TROUBLE SHOOTING HINTS
1. Main burner does not fire when thermostat calls for heat with venter operating.
a. Check pressure switch adjustment.
b. Check wiring connections between pressure switch and burner.
c. Check pressure switch for continuity across terminals, during venter operation.
2. Venter does not activate when thermostat calls for heat.
a. Check wiring.
b. Check relay for proper operation.
3. Flue gas odor.
a. Check system draft.
b. Check for negative pressure in building.
MAINTENANCE
1. Motor: Inspect motor once a year, the motor should rotate freely.
2. Wheel: Inspect venter wheel annually to clear any soot, ash or coating which inhibits either rotation or air flow.
Remove all foreign material before operating.
3. Vent System: Inspect all vent pipe connections annually for looseness and for evidence of flue gas leakage. Seal or
tighten pipe connections if necessary.
Page 6
Figure 5
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