Ventilation/Supply Fans (SF) and Exhaust Fans (EF).

TM 55-1905-223-24-17

(b)

Startup and operational check.

Turn electrical power ON at the circuit breaker to the unit.

Turn the selector switch on the heater to ON. Set the thermostat to a higher setting than the

ambient compartment temperature.

NOTE

The maximum ambient temperature at which the unit type heater can be operated is 80 .

When the heater has started, listen for noise and check for warm air flow. If noise is heard, or

there is no warm air, or no air flow, turn heater OFF.

Turn the primary breaker to the unit OFF.

Refer to Troubleshooting, Table 2-2, locate the problem and correct as required.

(c)

Shutdown.

Turn the selector switch on the heater OFF.

Turn electrical power OFF at primary breaker to heater. Tag breaker if it is being secured for a

maintenance function.

(3)

Convection space heaters (CH). The procedures for pre-inspections, service, startup, and

shutdown are the same as those for unit space heaters. Refer to paragraph a.(2) of this

procedure.

Ventilation/Supply Fans (SF) and Exhaust Fans (EF).

(1)

Pre-inspection and service.

WARNING

Turn electrical power OFF to avoid personal injury.

(a)

Turn electrical power OFF at primary breaker to the fan. Turn manual switch/controller

OFF.

(b)

Check fan impeller and motor for buildup of dirt and debris. Clean with soft brush, rag, or

vacuum cleaner as required.

(c)

Check impeller setscrew for looseness and secure firmly.

(d)

Make sure the impeller blades are not touching the housing.

2-4