Carrier operating and Service Manual download pdf (Page 10)

T--336

1--3

05/09

1.2 SYSTEM OPERATING CONTROLS AND

COMPONENTS

1 Electronic Thermostat (TH)

The system is equipped with an electronic

thermostat which operates in combination with a

separate relay board (See Figure 1--2 & Figure 1--3) to

control the operation of the system.

The setpoint is adjusted by manually turning the

controlboxmountedpotentiometertowards“COOLER”

or “WARMER”.

The thermostat’s temperature sensor monitors the

vehicles interior temperature at the return air section of

theevaporatorandcontrolsthe operatingfunctionofthe

system to maintain the desired vehicle interior

temperature.

2 Manual Switches

A/C Mode Switch (ACMS)

The drivers control is equipped with a single

HIGH--OFF--LOW switch. The switch is placed in the

desired fan speed postion to start temperature control.

3 Pressure Switches

Condenser Fan Switches (CFS)

The condenser fan switches are located in the

evaporator section. Switch CFS 1 controls the number

of fans in operation while switch CFR2 controls fan

speed.

1.3 PANEL ASSEMBLY, CONTROL BOX

91--62011

RELAY BOARD (See Figure 1--3)

POTENTIOMETER

ELECTRONIC THERMOSTAT

Figure 1--2 Panel Assembly, Control Box

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 41 42

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Carrier operating and Service Manual Page 10