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 121 of 481

TM 9-2320-272-10

2-22

2-4. BODY EQUIPMENT CONTROLS AND INDICATORS (Contd)

Key

Item and Function

1

POWER INPUT RECEPTACLE is connected by cable to outside power

source to provide electric power for air conditioner.

2

CIRCUIT BREAKER must be in ON position before use of air conditioner.

3

COMPRESSOR CIRCUIT BREAKER shuts air conditioner off automatically

if electrical or other malfunction develops in air conditioner. Circuit

breaker (2) must be manually reset to ON position after malfunction has

been corrected.

4

AIR CONDITIONER CONTROL regulates air circulation. COOLER position

circulates cool air. VENT position circulates outside air into the van body.

5

FAN SPEED CONTROL provides high and low fan speed operation for air

circulation.

6

TEMPERATURE SELECTOR CONTROL provides cool temperatures when

in COOLER position. In WARMER position, air conditioner maintains 68°-

72°F (20°-22°C) temperature. Air conditioner shuts off when temperature

selector knob is in OFF position.

7

HEATER SWITCH provides heated air in HEATER position and unheated

outside air in FAN position. Heater stops in OFF position.

8

WHITE INDICATOR LIGHT illuminates when heater is working properly.

9

RED INDICATOR LIGHT illuminates when heater stops because of fuel or

ignition malfunction.

10

RESET BUTTON is pressed to restart heater when fuel or ignition

malfunctions have been corrected.

11

HANDLE controls mixture of outside and inside air when heater is

operating.