Unit Components - Modine Manufacturing HD Installation And Service Manual

UNIT COMPONENTS

TO TURN OFF GAS TO APPLIANCE
1. Set thermostat to lowest setting.
2 Turn manual shut-off valve located outside of the unit to the
closed position.
3. Turn off all electric power to the appliance if service is to be
performed.
4. Remove access panel.
5. Turn the gas valve switch to the "OFF" position.
6. Replace the access panel.
Figure 14.1
Major Gas, Electrical Service,
Safety and Other Components
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1. Wiring Diagram
2. Power Exhauster
3. LED Dignostic Codes
4. Pressure Switch
5. Terminal Board
For Hot Surface Ignition
Upon a call for heat from the thermostat, power is supplied to
the power exhauster motor. The unit will go through a purge
period and then the hot surface igniter will be energized. After
the igniter has warmed up, the main valve in the combination
control valve will open to allow gas to flow to the burners. If the
14
14
15
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6. Control Transformer
7. Serial Plate (hidden)
8. Flame Sensor (hidden)
9. Flame Rollout Switch
10. Limit Control (hidden)
13
12
11
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11. Hot Surface Igniter (hidden)
12. Gas Orifices
13. Mounting Brackets
14. Combination Gas Control
15. Common Replacement Parts (hidden)
fan motor has not already started it will start shortly. If a flame
is not sensed for any reason the main valve will close and there
will be a short purge period before ignition is tried again. If the
flame is not sensed after four tries there will be at least a one
hour wait before ignition is tried again.
6-576.5
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