Carrier operating and Service Manual download pdf (Page 10)

1--1

T--35603/11

SECTION 1

DESCRIPTION

1.1 INTRODUCTION

This manual contains Operating Instructions, Service

Instructions and Electrical Data for Model 68RM35 Air

Conditioning and Heating equipmentlisted inTable 1-1.

Model 68RM35 systems (see Figure 1-1) consists of a

one piece air conditioning unit assembly, containing the

condenser & evaporator, and engine compartment

mounted compressor. To complete the system, the air

conditioning and heating equipment interfaces with

electrical cabling, refrigerant piping, engine coolant

piping (for heating), duct work and other components

furnished by the bus manufacturer.

Informationonthecompressorisprovidedin separately

bound manuals. Refer to Table 1-2

1. Compressor

2. Refrigerant Lines

3. Engine Coolant Piping

4. Air Conditioning Unit

5. Condenser Air Flow

6. Control Harness

7. Driver Control Panel

8. Fresh Air Connection

9. Power Harness & Power Relay

10. Battery

11. Alternator

Figure 1-1. A/C Component Identification

1.2 GENERAL DESCRIPTION

1.2.1 Air Conditioning Unit Assembly

Operation of the units is controlled automatically by a

microprocessor based Micromax Controller which

maintains the vehicle’ s interior temperature at the

desired set point.

The unit assembly (see Figure 1-2 and Figure 1-3)

includesthecondensingsystem equipment,evaporator

system equipment, Micromax controller, anda fresh air

connection. Componentsareaccessiblebyopeningthe

inside or outside covers. Descriptions of the systems

are provided in the following sub paragraphs.

1.2.2 Condensing System

The condensing system includes the condenser coil,

liquid--suction heat exchanger, fan and motor

assemblies, filter--drier,receiver (withsight glassesand

moisture indicator), liquid line solenoid valve, discharge

line check valve, discharge line connection, service

valves,fusibleplugandanambienttemperaturesensor.

The discharge check valve is a spring loaded, normally

closed valve that opens with the flow of refrigerant from

the compressor. When the compressor clutch is

disengaged, the discharge check valve will close,

preventing the flow of high pressure liquid from the

condenser back into the compressor .

The condenser coil provides heat transfer surface for

condensing refrigerant gas at a high temperature and

pressure into a liquid at high temperature andpressure.

The condenser fans circulate ambient air across the

outside of the condenser tubes at a temperature lower

than refrigerant circulating inside the tubes, this results

in condensation of the refrigerant into a liquid.

The receiver collects and stores liquid refrigerant. The

receiver is fitted with upper liquid level sight glass to

enable determination of refrigerant liquid level and a

lower moisture indicator to determine refrigerant

moisture content. The receiver is also fitted with a

fusible plugwhichprotectsthesystemfromunsafehigh

pressureconditions.Theliquid--suction heat exchanger

further cools the liquid refrigerant to improve overall

system efficiency. The filter--drier removes moisture

and debris from the liquidrefrigerant before it enters the

thermostatic expansion valve. The liquid line solenoid

valve closes when the system is shut down to prevent

flooding of coils with liquid refrigerant. The service

valves enableisolationofthefilter--drierfor service.The

ambient temperature sensor measures ambient

temperature and sends an electrical signal to the

controller.

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