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 TM 55-1905-223-24-17
6
Check exhaust grilles from heater to compartments for obstructions or buildup of dirt or debris.
Remove obstructions as required. Clean grilles with soft bristle brush or vacuum cleaner.
7
Check filters in recirculation air source. Make sure filters are clean and properly in place. Re-
position or replace air filters as required. Refer to step c. of this procedure.
8
Turn electrical power ON and start the unit.
(b)
Startup and operational check.
1
Make sure electrical power is ON at the primary breaker to the heater and to the supply air fan for
the heater.
2
Turn heater ON. Set thermostat to a higher setting than the ambient compartment temperature.
Make sure thermostat is set to HEAT mode (TM 55-1905-223-10).
3
When the heater has started, check for warm air flow at the heating duct outlet grille. If there is
no air flow, or no warm air, turn the heater OFF and refer to Troubleshooting, Table 2-2. Locate
the problem and correct as required.
(c)
Shutdown.
1
Turn thermostat/switch OFF (TM 55-1905-223-10).
2
Turn primary circuit breaker to the heater OFF. Tag the breaker if it is being secured for a
maintenance function.
(2)
Unit Space Heaters (UH).
(a)
Pre-inspection and service.
WARNING
Turn electrical power OFF to avoid personal injury.
1
Make sure all electrical power is OFF at the primary breaker to the heater.
2
Check heater air inlets and outlets for obstructions or buildup of dirt and debris.
Remove
obstructions as required. Clean with soft bristle brush or vacuum cleaner.
3
Check all electrical connections for looseness and secure as required.
4
Turn electrical power ON to the heater. Start the unit.
2-3
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