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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.
GAS PRESSURE SWITCH FOR WATER HEATER
1. Follow water heater manufacturer's instructions to light pilot. Turn the gas control valve to the ON position. Then
adjust the thermostat to call for heat, which will energize the venter motor. (May see a 1 to 8 sec. delay of venter
motor)
2. Turn gas control valve to the PILOT position, which will start a 1 to 3 min. post purge of the venter motor.
3. Repeat Step 1 and 2 to ensure proper operation.
SPILLAGE SWITCHES
1. Allow the water heater to heat up to operating temperature, then disconnect the power to the gas pressure switch.
2. Adjust the thermostat to call for heat with the venter inoperative. Allow approximately 2 minutes of flue gas spillage for
the spillage switches to sense the spillage and disrupt the thermocouple circuit, halting the gas flow to the pilot and
burner.
3. Wait 2 to 3 minutes. Reset the spillage switches and light the pilot, then perform a second safety spillage test (Steps 1
and 2).
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.
TROUBLE SHOOTING HINTS
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-92*. 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.
c. Check gas pressure switch for continuity across terminals when water heater burner is lit.
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.
c. Check pressure switch adjustment.
d. Make sure the vent damper is in open position.
e. 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.
4.
Pilot will not stay lit on water heater:
a. Solder all spillage switch wire terminal connections.
b. Check reset buttons on spillage switches.
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