Fastrax Hellfire 900, Installation, Operation & Maintenance Instructions Manual

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J.15 AAR Terminals, Signals, and Communications
1. To verify remote start:
1.1 Place the heater in REMOTE RTC mode, and make
a contact closure across AAR terminals A1 A2. The
heater starts after the delay on period.
2. To verify RUN indication:
2.1 Measure continuity across AAR terminals A3 A4.
2.2 Closed contact indicates run, open indicates
stopped. Confirm against actual heater state.
3. To verify ALARM indication:
3.1 Measure continuity across AAR terminals A5 A6.
3.2 Closed contact indicates alarm, open indicates
normal operation. Confirm against actual heater state.
4. To verify FORCE OFF:
4.1 Place the heater in MANUAL mode, open contact
closure across AAR terminals A7 A8.
4.2 The heater will stop after the post purge period.
5. To verify the tank valve switch:
5.1 Measure the voltage across terminals A9 A10. With
fan running the voltage is 120V AC.
6. To verify RS-485 communications:
6.1 Refer to controller LED indications for TD, RD, and TX.
J.16 Burner
1. Visually inspect mixing plates for cracks or blockage.
Remove any blockages. If cracks are found replace the
burner.
2. Over time corrosion and or dirt restrict the burner orifice.
3. Inspect burner for blocked gas orifice, if:
3.1 Signal strength is low even after replacing the flame
rod and wire,
3.2 Pilot pressure has to be raised significantly to get a
good signal,
3.3 Manifold pressure is above the maximum gas
pressure setting to achieve a 121°C (250°F) increase
of output air temperature.
4. To correct the problem, remove the burner, flame rod
and igniter, following the removal instructions in the
maintenance section.
5. Drill out any blocked gas orifice using a #47 (.0785) drill bit.
J.17 Defroster
1. The defroster applies 30 watts of heat to the burner next
to the flame rod and igniter. This is enough to raise the
temperature of the end plate by approximately 90°F. It can
be difficult to tell it is heating by sense of touch, therefore
measure the current draw using a clip on ammeter. The
current draw is 1.25 amps. A resetable fuse mounted on
the terminal block protects this circuit.
If there is no current draw, open the 5-amp panel breaker,
then close it to reset the fuse. If there is still no current
draw, inspect defroster for damage.Parts
Gas Orifice
Mixing Plates
Ignitor
Flame Rod