WD Catalog 2018

11-4

Chapter 11

– Typical AC Systems and Components

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Table of Contents

Index

Figure 11-6

A basic low profile roof

mount condenser. Hoses

must be run to the compres-

sor mounted on the engine,

and to the evaporator in the

cab.

LOW PROFILE ANGLE

MOUNTED CONDENSER

FAN & MOTOR ASSEMBLY

EVAPORATOR

COIL

OUTLET

INLET

EXPANSION

VALVE

SOLENOID

VALVE

RESISTOR

HEATER

CORE

BLOWER &MOTOR

ASSEMBLY

Sleeper cab AC system refrigerant flow is controlled by an electrically oper-

ated solenoid valve. The solenoid is wired to the control panel in the sleeper

cab. When the operator turns on the bunk AC system, the solenoid valve opens

to allow refrigerant to flow to the evaporator mounted under the bunk. With

most installations the fan motor cycles on and off to control temperature.

Figure 11-8 shows how the sleeper box and in cab AC units may be positioned

and connected.

Note:

CTC® systems are used in some applications.

AIR OUT

AIR IN

LOW PROFILE ROOF MOUNT

CONDENSER COVER ASSEMBLY

WITH FAN GUARD

AUXILIARY HVAC UNIT

Figure 11-7

This is an auxiliary HVAC

unit designed to heat and

cool a bunk or sleeper box.

It would supplement heat

energy movement by an

existing HVAC system. To

get engine coolant and

refrigerant to this auxiliary

system, you would “T” off

the existing refrigerant

lines and plumb the heater

in series with the cab unit,

or separately from the en-

gine.