Specification

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Troubleshooting
Troubleshooting
Gas Water Heaters
Venting/Combustion Air Equipment Motor Operation:
The venting/combustion air equipment motor is controlled
directly by the CK-20FV gas pressure switch, which senses
gas pressure in the main burner when firing.
Safety Circuit Operation:
Two GSK-3 exhaust gas spillage switches (mounted on
the water heater draft hood), one six foot length of 12
gauge wire and jumper wire, and one TCA-1 thermocouple
adapter block (all included in the control kit) are installed
as a safety circuit to prevent gas flow if exhaust gas spillage
around the draft hood occurs. When heated by the pilot
flame, the thermocouple generates a millivolt electrical
current that is routed through the GSK-3 safety circuit to
the gas valve. If spillage is detected, this millivolt current is
interrupted by the GSK-3 spillage switches and results in
shutdown of the gas valve, whereupon the pilot and main
burner flame are extinguished.
Diagnosis and Correction of Improper
Operation Resulting in Pilot Outages:
Troubleshooting pilot flame outages
with power-vented residential (millivolt
thermocouple-controlled) gas-fired
water heater applications
Field Controls SWG or PV series power venter, CAS-
series motorized combustion air system, or DI-series
draft inducer, controlled by a CK-20FV control kit
mounted on a millivolt controlled gas-fired
water heater.
Typical Installation Description:
Description of Proper Operation:
GSK
Spillage
Safety
Switch
Gas
Fired
Water
Heater
Choke
Plate
Figure: 1Water Heater & Power Venter Installation
Gas
Fired
Water
Heater
GSK
Spillage
Safety
Switch
PV Series
Power Venter
Vent Hood
SWG
Series
Venter
GSK
Spillage
Safety
Switch
Gas
Fired
Water
Heater
Choke
Plate
Figure: 1Water Heater & Power Venter Installation
Gas
Fired
Water
Heater
GSK
Spillage
Safety
Switch
PV Series
Power Venter
Vent Hood
SWG
Series
Venter
Causes of Pilot Flame Outage:
• Exhaust gas spillage, due to:
• Inadequate venting
• Slow response of gas pressure switch
• Excessive downdrafts (vertical venting
or wind loads (sidewall venting)
• Depressurization of surrounding area
• Excessive electrical resistance of the GSK
safety circuit
• Inadequate thermocouple output