44
44
M
ain
te
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an
ce
I.2
Motor/Impeller/Base Removal
WARNING
WARNING.
Risk of cutting fingers or hand.
Disconnect fan power prior to removing
combustion chamber access panel or air intake.
1.
Remove the combustion chamber access panel to
gain access to the motor.
2.
Open the motor junction box and disconnect all
wiring and conduit elbow.
3.
Remove the four motor mount bolts and remove
the motor/impeller assembly from the combustion
chamber.
4.
Install replacement motor/impeller/base assembly,
following reverse order.
I.3
Impeller Removal
NOTE:
Motor/impeller sets not match balanced by Thermon
Heating Systems void future warranty claims.
NOTE:
Replacement of motor or impeller only. Dynamically
balance the motor/impeller and base assembly to
vibration levels of 0.2 in/sec or less in the bearing planes.
NOTE:
Mark the position of the impeller on the shaft before
removing.
Third Empty Hole
Hub Set Screws
Tapered Hub
The impeller is fitted with a taper lock bushing. To remove
impeller from motor shaft:
1.
Clamp the motor and anchor the impeller using a
suitable bar.
2.
Remove the two hub set screws.
3.
Insert a set screw into the third previously empty hole
and tighten.
4.
Tap the outer half of the hub with a hammer and bar
to knock the impeller off the tapered hub.
5.
Slide hub off shaft, then remove impeller.
6.
To install the impeller, reverse sequence except step 4.
I.4
Flame Rod and Spark Igniter Removal
If the flame rod (3) or spark igniter (4) requires inspection or
replacement, remove them as follows:
1.
Gain access to the burner (1) by first removing the
combustion chamber access panel.
2.
The flame rod is to the left of the spark igniter. Gently
pull the wire from the terminal. Use a 7/8” deep socket
to unscrew and remove the flame rod. Apply a high
temperature anti-seize compound to threads prior to
reinstallation.
3.
The spark igniter is to the right of the flame rod.
Gently pull the wire from the terminal. Using a 13/16”
deep socket, unscrew and remove the spark igniter.
Apply a high temperature anti-seize compound to
threads prior to reinstallation.
4.
Reinstall the flame rod and ignition wires. A red band
identifies the flame rod wire.
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...
