Hired-Hand Universal Ray Tube Heaters: AG1 Series - Manual (Page 15)

NOTICE Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed
during normal operation or the heater’s built-in safety mechanisms will be compromised.
15
4.0 Troubleshooting Guide AG1 Series
Is 120V coming
to the fan?
Check for loose wiring
or resistance in hose
connections to pressure
switch. Are they ok?
The heater is equipped with a safety pressure
switch. This differential switch, located in the
fan compartment, is a normally open pressure
switch. Temporarily place jumpers across
the terminals of the switch (Be sure to reinstall
the burner control box cover).
Does the light energize?
Key
Start
Question
Process
Question
Corrective
Action
Yes
No
The fan is faulty
and must be
replaced.
Correct
wiring.
Repair.
No
Yes
Yes
Replace faulty light.
No
Replace the differential switch after verifying the following:
•
Baffle(s) is/are in the radiant tube(s) farthest from the burner.
• The heater, fan blower, squirrel cage, intake and exhaust are free from
dirt and obstructions.
• The 4” air intake pipe does not exceed 20 feet and/or 2 elbows.
• There is not a negative pressure experienced at the area of air intake
(i.e., attic space, high winds, very tight building).
•
The flapper cap on the exhast cap is not stuck closed.
If any of the above are occuring, please address the problem.
Is resistance through
the ignitor 50-400
Ω
?
Replace
ignitor.
No
Consult
factory.
Yes