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SERVICE
WARNING
Fire or Explosion Hazard.
Attempted disassembly or repair can cause
property damage, severe injury or death.
Do not disassemble the gas valve; it contains no
replaceable components.
CAUTION
Equipment Damage.
Can burn out heat anticipator in thermostat.
Do not apply a jumper across (or short) the valve
coil terminals even temporarily.
If Main Burner Does Not Come
On With Call For Heat
1. Confirm that the gas control knob is in the ON
position.
2. Adjust the thermostat several degrees above the
room temperature.
3. Use a dc voltmeter to measure the voltage across
the THTP and TP terminals.
4. If no voltage is present, check the control circuit for
proper operation.
5. If proper control system voltage is present, replace
the gas valve.
VS8521 VENTFREE MILLIVOLT GAS VALVE
WARNING TO THE APPLIANCE
OWNER. FOR YOUR SAFETY, READ
BEFORE LIGHTING APPLIANCE.
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury
or death.
Exactly follow the instructions for Pre-Lighting
Checks.
Pre-Lighting Checks
1. Before lighting, smell around the appliance area for
gas. If the appliance uses LP gas, be sure to smell
next to the floor because LP gas is heavier than air.
2. If you smell gas, immediately shut off the manual
valve in the gas piping to the appliance or, on LP, at
the tank. Leave the building immediately and call
your gas supplier. If your gas supplier cannot be
reached, call the fire department.
3. Do not force the gas valve control knob. Use only
your hand to turn the control knob.
4. If the knob does not operate by hand, the valve
should be replaced by a qualified service
technician.
5. The gas valve must be replaced if it was flooded
with water. Call a qualified service technician.
6. The gas valve is a safety device. It must be
replaced in the event of any physical damage such
as bent terminals, missing or broken parts, stripped
threads, or evidence of exposure to heat.
IMPORTANT
Follow the operating instructions provided by
the manufacturer of your heating appliance.
7
69-1223—1
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