Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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Problem Conditions* Possible Cause Remedy**
Heater cycles
excessively. (Less
than 30 second cycle
time).
No alarm.
ࢦ
Fan starts.
ࢦ
Controller LEDs
–
POWER on.
–
MOTOR on.
–
Run on.
ࢦ
HEAT LED cycles off
and on indefinitely.
Marginal flame signal.
Signal drops below 1.5 micro
amps.
Inspect flame rod and wiring. Replace
any damaged items, fouled rod, corroded
wire or cracked boot.
Manifold gas pressure set
too high.
Reduce gas pressure to within nameplate
setting.
Air intake blocked. Clear intake screen.
Duct system blocked.
Remove any blockage such as mud, ice,
or debris from:
1. Cross duct.
2. Tie duct.
3. Nozzles.
4. Rodent screens.
Insufficient number of track
duct vents open.
Open vents as per “Switch Heater Track
Duct Field Modifications Manual” 11237.
Heater starts and
runs
normally for a period
of time then stops
unexpectedly.
Alarm indicated.
ࢦ
Controller LEDs
–
POWER on.
–
ALARM red.
–
FSR ALARM
alternating.
ࢦ
DSI LED 3 flashes.
ࢦ
Marginal flame signal.
ࢦ
Signal occasionally
dropping below 1.5 micro
amps.
ࢦ
Measure flame signal.
ࢦ
Inspect flame rod and wiring.
ࢦ
Replace any damaged items, fouled
rod, corroded wire, or cracked boot.
Manifold gas pressure set too
high.
Reduce gas pressure to within nameplate
rating.
Gas manifold and supply
pressure slowly drop
while operating.
Vapour withdrawal causes
refrigeration effect to lower
LPG tank pressure.
Remove snow accumulation on propane
tanks.
Heater runs
continuously.
NO alarm.
Unable to stop the
heater remotely.
Mode selector switch in
manual position.
Heater accidentally left on. Toggle selector switch to REMOTE/AUTO.
ࢦ
Mode selector switch
in REMOTE/AUTO
position.
ࢦ
Controller LEDs
–
Power on.
–
MOTOR on.
–
HEAT on.
–
RUN on.
–
RTC on.
RTC has heater requested. Notify RTC dispatcher.