Carrier operating and Service Manual download pdf (Page 13)

1--4

T--356

03/11

ROADSIDE

(RS)

CURBSIDE

(CS)

1. Electrical Control Panel (See Figure 1-4.)

2. Liquid Line Solenoid Valve

3. Thermostatic Expansion Valve (TXV)

4. Roadside Blower Housing

5. Air Filter

6. Evaporator Coil

7. Curbside Blower Housing

Model/Serial

Number Plate

()

Figure 1-3. Unit Assembly -- Inside V iew (Typical)

Thecompressorraisesthepressureandtemperatureof

the refrigerant and forces it into the condenser tubes.

The clutch assembly provides a means of belt driving

the compressor by the bus engine. The suction and

discharge service valves enable servicing of the

compressor. Suction and discharge servicing

(charging) ports mounted on the service valves enable

connection of charging hoses for servicing of the

compressor, as well as other parts of the refrigerant

circuit. The high pressure switch contacts open on a

pressurerisetoshutdownthesystem whenabnormally

high refrigerantpressures occur.The electric unloaders

provide a means of controlling compressor capacity,

which enables control of temperature inside the bus.

1.2.5 Fresh Air Connection

A connection (see Figure 1-1) is provided on the unit

curb side for connection of the OEM supplied fresh air

ducting.

1.2.6 System Operating Controls And Compo-

nents

The system is operated by a Carrier Transicold

Micromax microprocessor controller (Figure 1-4) which

consists of a logic board, relay board, circuit breakers,

relays, and an OEM supplied driver control panel or a

Carrier Micromate control panel (Figure 1-8). The logic

board regulates the operationalcycles of the system by

energizing or de--energizing relays in response to

deviations in interior temperature or syst em pressures.

Modes of operation include Cooling, Heat and Vent.

With the Micromate set in the AUTO mode, the logic

board will cycle the system between the operating

modes as required to maintain desired set point

temperature.

In the vent mode the evaporator fans are operated to

circulate air in the bus interior.

In the heat mode the heat valve and the OEM supplied

floor blower and/or boost pump are energized. The

evaporator fans operate to circulate air over the

evaporator coil in the same manner as the vent mode.

In the cooling mode the compressor is energized while

the evaporator and condenser fans are operated. The

compressor is fitted with cylinder unloaders to match

compressor capacity to the bus requirements. Once

interior temperature reaches the desired set point, the

system may operate inthe clutch cycle or reheat mode.

A controller programmed for clutch cycle will

de--energize the compressor clutch and allow the

system to operate in the vent mode until further cooling

is required. A controller programmed for reheat will

maintaincompressoroperationandopenthe heatvalve

to allow reheating of the return air. In the reheat mode

interior temperature is maintained at the desired set

point while additional dehumidification takes place.

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Carrier operating and Service Manual Page 13

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