Dometic VN 780, VN 770, VN 830, VN 880 User Manual
REMOTE AUXILIARY AIR CONDITIONING
AND AIR DISTRIBUTION SYSTEMS
FOR VOLVO L-5 CHASSIS
INSTALLATION GUIDELINES
For Volvo Truck Models VN 770, 780, 830, 880
ENGLISH
Dometic Environmental Corporation
Rev. 20071204
L-2485
COPYRIGHT © 2007 Dometic Corporation, All Rights Reserved.
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.
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
Mounting the Power Logic Box
Routing Cables
INSTALLING THE RETURN AIR VENT 7
INSTALLING THE SUPPLY AIR DISTRIBUTION 7
Volvo Ductwork 7
Custom Air Distribution Plenum 1
Preparing for mounting the footwell and air plenum 1
Re-installing the Footwell 1
Installing the Plenum on the Front of the CHEB 1
INSTALLING THE CHEB 14
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5
6
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4
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
INTRODUCTION
The instructions that follow represent years of development of parts and procedures
that make the system perform well and appear “factory-installed.”
Figure 1. Typical Control Installation
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
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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
Figure 2. Mounting location for Power Logic Box
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
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Volvo L-5 A/C - Air Distribution System
Figure 3. Fastener location on Power Logic Box
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.
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 chafng.
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Volvo L-5 A/C - Air Distribution System
Figure 4. Vent location
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.
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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