TROUBLE-
SHOOTING
(Continued)
• If circuit across contacts okay, check continuity of wiring in motor circuit
8. Short Cycling (motor goes on and off)
A. Check thermostat. Contacts should remain closed. If contacts are breaking:
• Check thermostat anticipator setting. It should be between .75 and 1.0.
• If anticipator setting okay, check amp draw across thermostat. If amp draw
exceeds .65, check amp draw across coil of valve and time delay relay. Note:
On initial operation ofglo bar, there is a momentary surge of approximately 4.0
amps.
• If amp draw is within limits, check for shorts in thermostat wiring.
• If wiring is okay, replace thermostat.
9. Ignition Failures
WARNINGS:
• Never connect unit or ignition circuit to 230 volts.
• Never operate unit with glo bar touching burner or any other ground.
Damage to ignition control will occur.
• Besure sensor probe never touches glo bar.This will damageignition
control.
• If the ignition control is defective, it must be replaced, it is not field-
repairable.
CAUTION: Do not attempt to repair the ignition control. This may alter
it and cause it to operate incorrectly.
The electronic system is made up of two parts: the ignition control and the glo bar.
The ignition control is the brain of the electronic system. It has several functions:
1. When the blower reaches full r.p.m., a 24-volt circuit is completed to the ignition
control. (Check across yellow and orange wires.)
2. The red and blue wires at the ignition control are the 120-volt input for the glo-
bar circuit. When the 24-volt circuit is completed, the ignition control will
complete the 120-volt circuit to the glo bar and it begins to glow. (Check this
circuit across the two white wires at the ignition control.)
3. After approximately 20 seconds, a 24-volt circuit is completed through the igmtion
control to the gas valve, (This circuit is checked from brown wire at ignition control
to a neutral ground.) This circuit opens the valve, gas flows to the burner and is
ignited by the heat from the glo bar. Note: Glo bar remains on.
4. When the burner flame is established, the sensing probe will sense the presence
of burner flame and open the glo-bar circuit. The glo bar will then stop glowing.
It is important to determine the type of problem being experienced. Then the proper
checkout procedure can be made. The following is a list of problems, how to identify
in which area the problem is located, and how to correct it.
1. GIo bar will not glow - With blower running and mieroswitch engaged, check the
following:
A. Check for 24 volts A.C. across yellow and orange wires at ignition control.
If no voltage, check microswitch and limit switch for circuit completion as
well as wiring and wiring connections.
B. Voltage present across yellow and orange wires, check for 120-volt input to
ignition control across red and blue wires. If no voltage, check wiring all the
way back to power supply.
C. 120 volts present across red and blue wires, check for 120 volts across the tw(
white wires at ignition control. If no voltage, replace ignition control.
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