Brant Radiant Heaters HL2 series User Manual page 57

HL2 Series
Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed
NOTICE
during normal operation or the heater's built-in safety mechanisms will be compromised.
Without Relay Board:
Start
Question
Is the power across
Yes
the 24V wire on the
circuit board and
ground 24V?
No
Is there 120V on the
primary side of the
internal transformer?
No
Repair wiring between
power in and transformer.
Is the power across
the middle (low)
terminal of 24V plug
and ground (screw on
Yes
the Burner Control
Box) 24 Volts?
No
Repair thermostat or wiring
from thermostat to heater.
Check for loose wiring or
restrictions in hose connec-
tions to pressure switch.
Are they OK?
No
Replace wiring or hose connections.
* Refer to LED diagnostic Fault Code Chart.
Process
Corrective
Question Action
Is the power across
the t-stat wire on the
circuit board and
ground 24V?
No
The relay board is faulty
and must be replaced.
The internal
transformer is
Yes
faulty and must
be replaced.
Is there 24V
across the TH and
ground terminals
on the circuit
board?
No
Correct wiring.
*After 10-12 minutes of non-
Yes
operation has passed, is
there a flash code for APS
failure (2 or 3 flashes)?
No
Replace circuit board.
Key
With Relay Board:
Process
Question
Is the
circuit board
Yes
sending 120V
to the fan?
No
Is the pressure
switch stuck in the
closed position?
No
The circuit board is
faulty and must be
replaced.
No
Is the pressure switch stuck
No
in the closed position?
Is the circuit
board sending
Yes
Yes
120V to the
fan?
Replace the pressure switch after verifying:
• Baffle(s) are in the radiant tube furthest from
the burner.
• Heater, fan blowers ,squirrel cage, intake and
Yes
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).
57
5.0 Troubleshooting Guide
Corrective
Action
Is the fan
Yes
Yes
obstructed?
No
Replace
Yes
switch.
The fan is faulty and must be replaced
Yes
No
Yes
Is the fan
obstructed?
Remove
obstruction.
Replace
pressure
switch.
Remove
obstruction.