Detroit Radiant Products Company SV 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.
SV Series
15
Check for loose wiring
or resistance in hose
connection to pressure
switch. Are they ok?
The Heater is equipped with a safety pressure
switch. This differential switch, located in the
ignition controls 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?
Replace circuit board.
Check voltage at igniter during
ignition sequence (usually 7
seconds after power to the
burner control box). Is it 24V?
Key
Start
Question
Process
Question
Corrective
Action
The fan is faulty
and must be
replaced.
Repair.
No
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).
If any of the above are occurring, please address the problem.
No
Yes
Is resistance through
the igniter 1-6
Ω ?
Replace
igniter.
No
Replace
faulty wiring.
Yes
Correct problem.
Replace gas valve.
Yes
4.0 Troubleshooting Guide