Detroit Radiant Products Company HLV Series - Manual (Page 47)

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.
47
HLV Series
After the system has run for 20 minutes in high fire mode, measure box pressures
using a manometer with an adequate range.
Do the setpoints correspond with Chart 4.2 on page 44?
5.0 Maintenance • Troubleshooting Guide
Is the panel supplying
120V/220v to the exhauster?
Is there 24V on the secondary side of the
transformer located in the panel assembly?
No
Yes
The exhauster is faulty and
must be replaced.
Replace
transformer.
No
Yes
A faulty relay may exist in the
panel assembly. Consult factory.
Is the ignitor
physically damaged?
Replace ignitor.
Yes
Check voltage during ignition sequence (usually 5
seconds after power to burner control box). Is it 24V?
No
Is the resistance through
the ignitor 1 to 6
Ω ?
Replace faulty
wiring.
Replace
ignitor.
Yes
No Yes
Is the inlet or the outlet of
the unit obstructed?
No Remove
obstruction.
Yes
Check for loose wiring or
restrictions in hose connections to
the pressure switch. Are they OK?
No
Repair wiring or hose
connections.
Yes
Temporarily place a jumper across the
terminal of the safety pressure switch.
Set control box cover in place.
Does the ignitor glow red?
Yes No
Adjust dampers until
proper box pressures
are achieved.
Yes
Is there 24V on the
secondary side of the
transformer in the burner
control box?
Replace faulty transformer. Note: The original
transformer is equipped with an automatic
resetting fuse. Confirm fuse has not been tripped.
No
No
Yes
Is there 24V between
L1 and ground at the
circuit board?
No
Replace faulty
wiring.
No
Replace circuit board.
Yes
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