Dometic VN 770 Instruction sheet

ENGLISH

Dometic Environmental Corporation

Rev. 20071204

L-2485

REMOTE AUXILIARY AIR CONDITIONING

AND AIR DISTRIBUTION SYSTEMS

FOR VOLVO L-5 CHASSIS

INSTALLATION GUIDELINES

For Volvo Truck Models VN 770, 780, 830, 880

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,

photocopying, 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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Volvo L-5 A/C - Air Distribution System

DOMETIC TRUCK REMOTE AUXILIARY AC SYSTEMS

FOR VOLVO L-5 CHASSIS

CONTENTS

INTRODUCTION 4

INSTALLING THE CONTROL 4

Required Tools 4

Installing the Qt Digital Display 4

Mounting the Power Logic Box 5

Routing Cables 6

INSTALLING THE RETURN AIR VENT 7

INSTALLING THE SUPPLY AIR DISTRIBUTION 7

Volvo Ductwork 7

Custom Air Distribution Plenum 10

Preparing for mounting the footwell and air plenum 10

Re-installing the Footwell 10

Installing the Plenum on the Front of the CHEB 14

INSTALLING THE CHEB 14

INSTALLING THE CONDENSER 17

ROUTING THE REFRIGERANT LINES AND CONDENSER POWER CABLE 18

TESTING THE INSTALLATION 20

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Volvo L-5 A/C - Air Distribution System

The instructions that follow represent years of development of parts and procedures

that make the system perform well and appear “factory-installed.”

INTRODUCTION

INSTALLING THE CONTROL

Mount the control in a place that provides the driver

convenient access. An ideal location would be near

the current HVAC controls.

Required Tools

• Drill motor

• Hole saws: 1-5/8", 1-7/8", 2-1/2", 3.5" (for 10K unit)

and 4"

• Drill bits: 1/8", 5/32", 9/32"

• Nut drivers: 1/4", 3/8", 15/16"

• Phillips head screwdriver

• Open-end wrenches: (2) 7/16", (1 each) 5/16", 13/16"

& 3/4"

• Torque wrench may be also be required

Figure 1. Typical Control Installation

Installing the Qt Digital Display

Refer to the mounting instructions and template

provided with your kit.

• Route the CXP cable through the wall and into the

luggage compartment. Remove the factory HVAC

control panel to do this.

• Route the CXP cable to the rear of the bunk for later

connection.

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Volvo L-5 A/C - Air Distribution System

Mounting the Power Logic Box

The Power Logic Box (PLB) will be mounted under

the rear, center portion of the bunk (see Figure 2). To

accomplish this, rst remove the carpeted panel at

the rear of the bunk. It is held in place by “Christmas

trees” at each corner.

Remove the backing plate from the PLB, by removing

the four machine screws at the bottom (see Figure 3).

Place the backing plate on the front of the bunk

center area, off center toward the passenger side.

Locate the two weldnuts, and place the backing plate

between them. Mark the four mounting holes, and

remove the plate.

Drill four diameter 7/32" holes. Use four #10 machine

screws to mount the box. The easiest way to do this

is to put the machine screws through the holes, and

secure with a nut. Replace the mounting plate onto

the PLB. Slide the PLB behind the bunk, and push

Figure 2. Mounting location for Power Logic Box

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Volvo L-5 A/C - Air Distribution System

onto the machine screws. Secure the box with four

nuts and lockwashers. KEPS nuts are easiest to use.

Routing Cables

The box has several different types of cables:

• Wires enclosed in split loom

• Flexible power cables

• “Phone” type cables

The “wires in split loom” will go toward the CHEB

unit.

Figure 3. Fastener location on Power Logic Box

The exible power cord(s) will go toward 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.”

For easier installation, it is recommended that the

cables be placed in the appropriate direction before

mounting the box. All cables should be neatly routed

and clipped, to prevent chafng.

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Volvo L-5 A/C - Air Distribution System

INSTALLING THE RETURN AIR

VENT

The supplied return air vent should be installed under

the bunk in the side panel, either on the passenger or

driver side. The passenger side is recommended as

there is less chance that it will get blocked by objects

in the luggage compartment, and it will also allow

easy access to the refrigerant tting.

To install, locate the area shown in Figure 4.

The grill should be installed between the panel

supports on the backside of the kickpanel. Locate

the supports and cut out for the grill. A holesaw and

reciprocating saw is recommended to cut out the

hole. If your kit contains the 12.5" x 5.5" grills instead

of the 10" x 10" grill, use a 4" holesaw to cut at least

two holes behind each grill. Use of the reciprocating

saw is optional for those grills.

Figure 4. Vent location

INSTALLING THE SUPPLY AIR

DISTRIBUTION

For this installation, a custom air plenum must be

installed, as well as the Volvo ductwork. A 4" duct

will feed the Volvo ductwork, and a 6" (for the 14k

system) or 4" (for the 10k system) will feed the custom

air plenum.

Volvo Ductwork

To feed the Volvo ductwork, remove the passenger

side window footwell and a section of the duct, as

shown in Figure 5 and 6.

The duct is secured from the top by “star” screws.

Below the bunk, there is a sensor which must be

removed. Access the sensor from the passenger

luggage door. Remove the duct from the truck, and

cut a 4" hole into it as shown in Figure 7 & 8.

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Volvo L-5 A/C - Air Distribution System

Figure 5. Location of installed ductwork

Figure 6. Footwell removed

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Volvo L-5 A/C - Air Distribution System

Figure 7. Removal of sensor.

Figure 8a. Four inch hole cut in Volvo duct. Figure 8b. Installation of grill and ducting.

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Volvo L-5 A/C - Air Distribution System

Locate the V4 RND BLACK 4" grill. Using two cable

ties, secure the vanes so that they will not turn. See

Figure 8a and 8b. Use a length of the supplied weather

stripping under the lip of the grill to prevent air from

leaking after installation. Install the grill from the inside

of the duct, with the vanes pointing upward. Push the

duct and grill back into the hole from which it came.

With assistance from outside the truck, reach into the

luggage compartment and push the length of 4" duct

and one hose clamp over the grill. Push the duct over

the grill until the grill is tight up against the duct, then

tighten the clamp. Replace the duct, and tighten the

screws.

Custom Air Distribution Plenum

Find the metal custom plenum and the passenger

side window footwell.

Locate the four (4) V4 RND BLACK grills and line up

on the window footwell to mark for hole cutting. See

Figure 10. Use a 4" holesaw to cut the holes.

Line the anges of the plenum with the weather strip-

ping. See Figure 9. Place the plenum on the back of

the footwell and secure with the 6-32 screws. Trim the

Figure 9. Installing the weatherstripping on the custom plenum.

carpet at the bottom of the plenum duct so that the

carpet will fold up.

Preparing for mounting the foot-

well and air plenum

Before the footwell is mounted back into the truck, the

cut out for the duct must be made to allow the duct

to extend below the bunk surface. Use the template,

as provided in Figure12a or 12b, to cut the hole. Use

a 1/8" bit to drill locator holes from under the bunk.

Go to the passenger side luggage door, and look up

to the rear corner of the bunk. See Figure 11. Find

the metal support that holds the bunk, and drill right

at the edge at the side of the truck, and towards the

rear of the truck.

Re-installing the Footwell

Gently insert the duct into the hole. Direct it down-

ward, while pushing the footwell toward the window.

Once it is all the way down, put the top ange of the

footwell behind the window fascia. Fasten the foot-

well to the wall and oor.

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