Detroit Radiant Products Company HLV Series - Manual (Page 46)

46
HLV Series
Does the ignitor warm
up and glow red?
Does the exhauster
fan turn on?
5.0 Maintenance • Troubleshooting Guide
Turn up thermostat
Is the power at the
exhauster 120V/220V?
No Yes
Continued on page 48
No
Is the thermostat supplying 24V
to the exhauster control panel?
Find the source of the
electrical problem
No
Is power at the burner
control box 120V/220V?
No
Yes
Is the thermostat supplying
24V to the terminal plug on the
burner control box?
Yes
No
Find the source of the
electrical problem.
Yes
No
Find the source of the electrical
problem between the thermostat
transformer, thermostat and panel.
Yes
Replace the pressure switch
after verifying:
• Baffle(s) are in the radiant tube
furthest from the burner.
• Heater, fan blowers ,squirrel cage,
intake and exhaust are clean and
free from dirt and obstructions.
• The 4” air intake pipe does not
exceed 20 ft. and/or 2 elbows.
• There is not a negative pressure
experienced at the area of air
intake (e.g.; high winds, attic
space, tightly sealed building).
After the ignitor is fully
energized, does the gas
valve open?
Yes
Test for 24V at valve opening period (usually 5 seconds after
power to the burner control box). Is there 24V at the valve?
No
Replace circuit board
and/or wiring harness.
Yes
Check to confirm gas pressure is
within minimum and maximum inputs
as indicated on the heater’s rating
plate. Is gas pressure OK?
No
Correct problem.
Replace gas valve.
Yes
No
Find the source of the electrical
problem between the thermostat
transformer, thermostat and panel.
HLV Series Troubleshooting Guide
Yes