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SYSTEM CONTROL CHECK OUT PROCEDURES
1. Adjust the thermostat and/or aquastat to call for heat and observe the power venting system for proper operation
sequence. (Repeat if necessary)
a. Aquastat calls for heat.
b. After a short delay, the relay is energized, the venter motor starts and the vent damper begins opening.
c. Pressure switch closes, the vent damper reaches the open position and the burner starts.
d. Aquastat is satisfied, the burner stops and the vent damper begins closing.
e. This starts the post purge cycle. Purge time 1 to 2 min.
2. While system is operating, disconnect power to the venter motor. This should open the pressure switch contacts and
stop burner operation.
T
S
H
ROUBLE
HOOTING
INTS
1. Venter does not activate when thermostat calls for heat.
a. Check wiring: 115 VAC from L1 to ground; N connected to a neutral.
b. Check for 24V from orange to black wires on base of timer relay. If no other voltage, the appliance is not calling
for heat to the CK-41P. If there is 24 volts continuously for at least 45 second, there should be 115 volts from N
to M. If not, the time relay is defective, or L1 and N are not properly wired.
2. Flue gas odor:
a. Check system draft. Adjust power venter's airflow adjustment damper if necessary.
b. Check for negative pressure in building.
3. Venter activates but burner does not fire after a minimum of 45 second continuous call for heat:
a. Check wiring.
b. Check pressure switch adjustment.
c.
Make sure the vent damper is in open position.
d. Check for 24 volts from both yellow wires on pressure switch to black wire on base of timer relay. If neither yellow
wire has 24 volts, the vent damper is defective, has loose wiring, or is not receiving call for heat on the orange
wire. If one yellow wire has 24 volts but the other does not, the pressure switch is not closing.
CAUTION: If for any reason the system has shut down during operation, the cause of the system failure should be
investigated and corrected before resetting the safety switch and restarting the system.
Page 4
Diagram B
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