TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 274 of 481

TM 9-2320-272-10

2-165

(4)

Open heater fuel shutoff valve (5).

(5)

Set heater switch (3) to HEATER (for heated air) or FAN (for unheated

air) as desired. White indicator light (4) should come on when heater is working

properly.

(6)

Set louver operating handles (4) on each side to control mix of outside

air with recirculated air.

(7)

Open heat registers (7) below heaters.

(8)

To stop heaters, turn off heater control switch (3).

CAUTION

Do not turn off heater circuit breaker switches (switches 5 and 8) until

white indicator light goes off. Damage to heater will result.

(9)

To secure heater for transit, turn heater fuel shutoff (5) and turn off left

heater switch (switch 5) and right heater switch (switch 8), as required.

2-27. OPERATION OF EXPANSIBLE VAN TRUCK (Contd)