Dometic Peterbilt 379 CHASSIS Foglio di istruzioni

ENGLISH

Dometic Environmental Corporation

Rev. 20080221

ID: 2520

REMOTE AUXILIARY AIR CONDITIONING

AND AIR DISTRIBUTION FOR

PETERBILT 379 CHASSIS

INSTALLATION GUIDELINES

for Peterbilt Truck Model 379 with a 70" Sleeper

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No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photo-

copying, recording or otherwise without prior written consent by Dometic Environmental Corporation. Every precaution has been taken in the preparation of this

manual to insure its accuracy. However, Dometic Environmental Corporation assumes no responsibility for errors and omission. Neither is any liability assumed for

damages resulting from the use of this product and information contained herein.

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Peterbilt 379 Installation Guidelines

CONTENTS

INTRODUCTION 4

LOCATING THE COMPONENTS 5

INSTALLING THE CONTROL 6 – 8

INSTALLING THE RETURN AIR VENT 9

INSTALLING THE SUPPLY AIR DISTRIBUTION 10 – 11

INTRODUCTION

This document contains supplemental guidelines for installing the Qt-series control and air distribution for the

Dometic auxiliary air conditioning system on a Peterbilt 379 chassis with a 70" sleeper. It is intended to be used

in conjunction with the standard installation manual, which covers all other aspects of installing, testing and

operating this system.

These are suggestions based on previous installations. Please be creative in your installation, but keep functionality

and safety in mind. Key issues are: evaporator discharge venting, evaporator return air and condenser air ﬂow.

Other issues include: controls accessibility, condensate removal and wire and hose chafe protection.

Do not attempt to install any components until you read and understand the instructions in both manuals.

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Peterbilt 379 Installation Guidelines

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Peterbilt 379 Installation Guidelines

LOCATING THE COMPONENTS

The Dometic remote auxiliary air conditioning system

consists of two basic components: an outside

condensing unit, which contains the condenser and

an exhaust fan, and an inside unit, which contains

the compressor, heater, evaporator and blower

(CHEB). The two units are connected by precharged

refrigerant lines with quick-connect ﬁttings.

Determine where best to install the CHEB (Fig. 1).

Refer to the manual that came with the CHEB for

more information. Keep in mind that the driver’s side

luggage box is probably one of the most used storage

areas, so for your ongoing storage convenience,

consider the passenger's side luggage box, then

the center storage area, and lastly the driver’s side

box for CHEB installation. Use the CHEB template to

determine the best place to mount the unit.

The Dometic condenser may be installed either under

or behind the sleeper (Figs. 2a-2b).

IMPORTANT!

Refer to the Dometic installation manual

for details on installing and connecting the

CHEB and condensing unit.

Figure 1 - CHEB installed in luggage compartment

Figure 2a - Condensing unit mounted under truck

Figure 2b - Condensing unit mounted on back of sleeper

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Peterbilt 379 Installation Guidelines

Figure 3a - Control/Display panel mounted

Figure 3b -Alternative Control/Display panel mounting location

Control mounted

INSTALLING THE CONTROL

Installing the Control/Display Panel

Mount the control in such a location as to give the

driver good access. The suggested location would be

near the current HVAC controls, however, that may be

very tough on some models (Figs. 3a-3b). Route the

CXP cable through the wall or cabinet and into the

luggage compartment, then to the rear of the bunk for

later connection.

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Peterbilt 379 Installation Guidelines

Installing the Power Logic Box

The Power Logic Box (PLB) is commonly mounted

on the front wall of the driver’s side luggage box

(Fig. 4). The PLB should be mounted in a relatively

accessible location, within about 4 feet of the CHEB

unit. The PLB comes with a mounting plate for

mounting to a vertical surface. If you want to mount

to a ﬂoor or other horizontal surface, remove the

mounting plate (Fig. 5). The PLB must be mounted in

a vertical position, see the label on the box for more

information.

Figure 4 - Possible PLB mounting location

Figure 5 - Fastener location on PLB

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Peterbilt 379 Installation Guidelines

ROUTING CABLES

The box contains several types of cables:

• Wires enclosed in split loom

• Flexible power cables

• Phone-type cables

The wires in split loom go to the CHEB unit. The

ﬂexible power cables go to the power distribution

panel. The phone cable mounted on the CHEB unit

plugs into the hole marked TSEP. The phone cable

from the Control/Display plugs into the hole marked

Display.

All cables should be neatly routed and clipped to

prevent chaﬁng.

IMPORTANT!

Refer to the Dometic installation manual for

details on routing and connecting cables

from the Control/Display panel to the PLB

and CHEB.

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Peterbilt 379 Installation Guidelines

Figure 6 - Location for cutting return air vent

Figure 7 - Return air vent hole cut

INSTALLING THE RETURN AIR VENT

The supplied return air vent(s) should be installed

under the bunk, in the same area where the CHEB

will be mounted. Your package may contain either

one large grill with a mounting frame or two smaller

12.5" x 5.5" surface-mount grills. We suggest using a

hole saw and reciprocating saw to cut out the hole for

the large grill. If you received the two 12.5" x 5.5" grills

instead of the one large grill, use a 4" hole saw to cut

at least two holes behind each grill. Use of the recip-

rocating saw is optional for those grills (Figs. 6-8).

Remember, good air ﬂow from the return air grill

to the CHEB evaporator coil is critical for your

air conditioning system to perform correctly. Do

not allow anything to block this air ﬂow.

Figure 8 - Return air grill ange installed

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Peterbilt 379 Installation Guidelines

INSTALLING THE SUPPLY AIR DISTRIBUTION

For this installation, we will install 4" ducts. Depend-

ing on the capacity of the system, you may have

two or three vents supplied. You must use all vents

supplied with the kit to get the rated air ﬂow out of

the system.

This kit comes with a duct combiner that allows one

4" duct to be vented into the truck’s pre-existing air

distribution system. Find the combiner (Fig. 9), and

mount to the bottom of the plastic duct that runs from

the truck’s HVAC unit to the rear wall of the sleeper.

You will have to cut out the duct so that the ﬂapper

damper can operate. Secure with screws.

The remaining 4" grill(s) can be located wherever you

choose, however, be aware that cold air falls and hot

air rises. It is best to install at least one vent high in

the cab. Be creative. Use existing features to mount

grills or hide ductwork, such as: cabinets, closets,

bunk tray at the foot of the bed, wire chases, etc. The

bunk tray is a good way to use what is existing:

• On the 379, 70" sleeper, remove the bunk tray

at the foot of the bed. Cut a 5" hole in the metal

below, and a 4" hole in the bunk tray in the same

area. Mount one 4" vent into the bunk tray. Run

the 4" duct up through the hole in the metal, and

connect to the grill with a hose clamp. Replace

the bunk tray.

Figure 9 – Duct combiner

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