Brant Radiant Heaters DX3L Series Manual page 59

DX3L Series
Check to make sure gas pressure is
within minimum and maximum inputs, as
indicated on the heater's rating plate.
Is the gas pressure OK?
No
Correct problem.
Is the heater properly
grounded? Is the heater's
polarity correct?
No
Correct problem.
Sensing rod is faulty or
flame is weak. Check
to make sure heater is
operating at proper gas
pressure as indicated on
heater's rating plate and
then, if needed, replace
sensing rod.
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.
Yes
Replace gas valve.
Yes
With a microampmeter, check
DC amperage at flame rod. Is it
greater than .07 microamps?
No
Yes
Check to make
sure flame sensor
wire is OK and
then replace
circuit board.
NOTICE
The heater is equipped with a normally
open safety pressure switch. Temporarily
place jumpers across the terminals of the
switch (reinstall control box cover).
Does the igniter glow red?
NOTE: If normal operation does not
continue after bypassing the switch, consult
factory to troubleshoot prior to continuing.
No
Replace circuit
board.
Replace the appropriate pressure switch
after verifying:
• There is continuity across the thermal fuse.
• 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).
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Yes