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C.
OPERATION
C.1 General
1.
To operate heater, ensure power supply is properly
connected as specified in the wiring schematic (refer to
Figure 2 to Figure 7, page 6 to 9).
2.
If the heater is setup to operate on a thermostat, ensure
the temperature set point is set high enough to turn on
the heater.
3.
The fan motor will not start immediately.
4.
After a delay of 20-50 seconds, the fan contactor will
operate and the fan will start. See paragraph B3.3 for
proper fan rotation.
5.
During normal operation, the thermal cut-out control
should not cycle the heater ON and OFF. If cycling occurs,
check to see if there is an airflow blockage. If there are no
obstructions, the heater must be examined by qualified
personnel to determine the cause of the thermal cut-out
cycling.
D.
REPAIR & REPLACEMENT
WARNING.
Disconnect heater from power supply at
integral disconnect or fuse box before opening enclosures
or servicing heater.
WARNING
Lock the switch in the "OFF" (open) position and tag the
switch to prevent unexpected power application.
This heater should only be serviced by qualified personnel
with electrical heating equipment experience.
Install and use the heater in accordance with local codes
and this manual.
NOTE*:
ONLY USE FACTORY SUPPLIED REPLACEMENT PARTS OF
THE SAME SPECIFICATION. REFER TO TABLE 3
D.1 Heating Elements
1.
Disconnect all wires connected to the heating element
terminals. Remove louver assembly from heater. Remove
three heater cowl baffles. Remove heating elements,
noting their proper placement.
2.
Install factory-supplied replacement heating element (see
Figure 8 – Heating Element Assembly, page 10).
0.1
Ensure that the heating element attaching screws are
in good condition.
0.2
Re-attach heating element mounting screws and
tighten.
0.3
Check that the heating elements are not in contact
with the cabinet or each other.
3.
Reinstall all wires with hardware provided. Torque the
element terminal hardware to the torque specifications,
refer to Table 4 - Recommended Torque Specifications,
page 13.
4.
Reinstall heater cowl baffles.
5.
Reinstall the louvers.
10 10
6.
Operate the unit for a minimum of 10 minutes to allow the
heating elements to reach a steady state. If no warm air is
discharged from the heater, shut off the unit and refer to
Section F. Troubleshooting Tips, page 13.
7.
To shut off heater turn the thermostat to lowest set point.
8.
The main contactor(s) will de-energize the elements.
9.
The fan motor will continue to operate, purging the
residual heat from the elements.
10.
After a delay of 20-70 seconds, the fan contactor will open
and the fan will stop.
D.2 Fan
1.
Remove the rear fan cage. Remove the screw securing the
fan to the fan hub attached to the motor.
2.
Replace fan with factory-supplied fan. Install the fan such
that the mounting hub collar of the fan faces the inside of
the heater i.e. facing towards the elements. Ensure motor
shaft end is flush to hub collar.
D.3 T hermal Cut-Out
1.
Disconnect all wires connected to thermal cut-out.
2.
Remove two mounting screws.
3.
Remove thermal cut-out switch from the enclosure.
4.
Replace thermal cut-out with factory-supplied
replacement thermal cut-out.
5.
Reinstall thermal cut-out switch in the control enclosure.
6.
Re-attach thermal cut-out mounting screws.
7.
Reconnect all wires to thermal cut-out.
Figure 8 – Heating Element Assembly
HEATING ELEMENT
HEATER
CABINET
PANEL
ELEMENT
TERMINAL
HARDWARE
ELEMENT
MOUNTING
HARDWARE
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