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CHECK SAFETY SHUTDOWN PERFORMANCE
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE, SEVERE IN-
JURY, OR DEATH
Perform the safety shutdown test anytime work is
done on a gas system.
1. Place gas control knob in PILOT position.
Main burner should go out and pilot should
remain lit.
2. Extinguish pilot flame. Pilot gas flow should
stop within 2-1/2 minutes. Safety shutoff of
pilot gas proves complete shutdown since
safety shutoff valve blocks flow of gas to main
burner and pilot.
3. Relight pilot burner and turn gas control knob
to ON.
4. Set thermostat to call for heat and observe
appliance through one complete cycle to make
sure it operates as intended.
SERVICE
CAUTION
Never apply a jumper across (or short) valve coil
terminals. This may burn out thermostat heat antici-
pator.
IMPORTANT
Allow 30 seconds after shutdown before reener-
gizing step-opening model to ensure lightoff at step
pressure.
IF PILOT WILL NOT LIGHT
1. Make sure the main gas supply valve is open and the
pilot gas supply line is purged of air.
2. Attempt to light pilot following procedure in "Light
Pilot", page 4.
3. Then if:
a. Pilot gas adjustment screw is closed, readjust
pilot flame. Refer to page 4.
b. Compression fitting has a gas leak, replace old
compression fitting or tighten new one. Refer to
page 3.
c. Pilot burner tubing or orifice is clogged, replace
combination gas control. Refer to page 1.
IF PILOT GOES OUT WHEN GAS CONTROL KNOB IS
RELEASED
1. Make sure the gas control knob is held in at least one
minute to allow the generator time to heat.
2. Check pilot flame adjustment, refer to page 4.
3. Check the wiring between the generator and the
valve operator in the gas control.
4. Make sure jumper between valve operator and power
unit is secure and connections are clean. Connection to
power unit should be tightened 1/4 turn beyond finger
tight.
5. If pilot still goes out, measure the open and closed
generator circuit output voltages. Compare to acceptable
range charts in the generator specifications or in the Gas
Controls Handbook. Replace the generator if voltages are
outside the acceptable range.
6. Check power unit resistance. If above 11 ohms,
replace gas control.
IF MAIN BURNER WILL NOT COME ON WITH CALL
FOR HEAT
1. Make sure gas control knob is in the ON position.
2. Adjust thermostat several degrees above room tem-
perature.
3. Disconnect leadwires to lower left TH terminal and
lower right PP terminal to isolate valve operator coil from
balance of circuit. Measure resistance of coil. If coil is not 2
ohms ±10 percent, replace VS824A Valve Operator.
4. Measure the open and closed generator circuit out-
put voltages and compare to acceptable range charts in
the generator specifications or in the Gas Controls Hand-
book. Replace the generator if voltages are outside the
acceptable range.
IF BURNER IS OVERFIRING
Adjust pressure regulator to correct pressure. If regula-
tor cannot be adjusted and supply pressure is in normal
range, replace complete gas control.
INSTRUCTIONS TO THE HOMEOWNER
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE, SEVERE IN-
JURY, OR DEATH
Follow these warnings and lighting instructions
exactly.
1. Before lighting, smell all around the appli-
ance area for gas. If appliance uses LP
(bottled) gas, also be sure to smell next to
floor because LP gas is heavier than air. If
you smell gas, immediately shut off the man-
ual valve in the gas piping to the appliance.
ON LP SYSTEMS, AT THE TANK. Do not try to
light any appliances in the house. Do not
touch electrical switches or use the phone.
LEAVE THE BUILDING and call your gas sup-
plier from a neighbor's house. If your gas
supplier cannot be reached, call the fire de-
partment.
2. Do not force the gas control knob on the
appliance. Use only your hand to push down
or turn the gas control knob. Never use any
tools. If the gas control knob will not operate
by hand, the control should be replaced by a
qualified service technician. Force or at-
tempted repair may result in fire or explosion.
3. The control must be replaced if it has been
flooded with water.
4. The control is a SAFETY DEVICE. It must be
replaced in case of any physical damage, tam-
pering, bent terminals, missing or broken
parts, stripped threads, or evidence of expo-
sure to heat.
IMPORTANT
Follow the appliance manufacturer's instructions.
The information below will assist in typical control
applications, but the specific controls may require
special manufacturer instructions.
Lighting the Pilot Burner
STOP: Read the warning above.
This appliance has a pilot burner which must be lit by
hand. If the pilot flame has gone out, follow these instruc-
tions exactly.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance.
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