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S
C
C
YSTEM
ONTROL
HECK
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, the burner stops and venter motor should operate 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. 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 fuel flow
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.
O
P
:
UT
ROCEDURES
Page 5
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