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SYSTEM CONTROL CHECK OUT PROCEDURES
1. For furnaces or boilers, 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.
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.
b. Check gas pressure switch for continuity across terminals when gas valve is pressurized.
c. Check gas pressure.
2. Flue gas odor:
a. Check system draft.
b. Check for negative pressure in building.
3. Pilot will not stay lit on water heater:
a. Solder all spillage switch wire terminal connections.
b. Check reset buttons on spillage switches.
REPAIR AND REPLACEMENT PARTS LIST
MODEL
PART NUMBER
Gas Pressure Switch
46284200
GSK-3 Spillage Switch
46086400
Post Purge Timer
46282800
Pressure Switch
46083000
TCA-1 Thermocouple Adaptor
46082700
TCA-2 Left Handed Thermocouple Adaptor
46429900
