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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 120Vac.
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
pressure setting, a minimum 60
°C
(140°F)
increase of output air temperature can not be
achieved.
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 #48 (.076) drill bit.
J.17 Defroster
1.
The defroster applies 25 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 32
°C (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 0.9 amps. A “Reset Enabled” 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.
Summary of Contents for HELLFIRE 400
Page 26: ...26 26 Installation Figure 2 140 Clearance Figure 3 155 Clearance...
Page 27: ...27 27 Installation Figure 4 Clearance Turned 90 Degrees...
Page 39: ...39 39 THERMON HEATING SYSTEMS INC Heater Specifications...
Page 40: ...40 40 THERMON HEATING SYSTEMS INC Heater Specifications...
Page 41: ...41 41 CCI THERMAL TECHNOLOGIES INC Heater Specifications...
Page 42: ...42 42 THERMON HEATING SYSTEMS INC Heater Specifications...
Page 54: ...54 54 NOTES...
Page 55: ...55 55 NOTES...
