Operating instructions

39
NOTE
THE DOMETIC CORPORATION WILL NOT BE HELD
LIABLE FOR ROOF STRUCTURAL OR CEILING DAM-
AGE DUE TO IMPROPERLY INSULATED OR SEALED
DUCTWORK.
Return air opening must have 40 sq. in. minimum free area
including the filter.
Return air to the air conditioner must be filtered to prevent
dirt accumulation on air conditioner cooling surface.
Total System Pressure must be between the following:
0.55 to 0.90 in. W.C. for 579 Series
0.40 to 1.10 in. W.C. for 591, 595 & 630
0.12 to 0.65 in W.C. for 600 Series
This is determined with the air conditioner blower operation
on high speed and return air filter and grille in place.
INSTALLATION
The Dometic Corporation recommends the basic configura-
tion shown below for installing this Air Conditioner System. We
have found by testing, that this configuration works best in
most applications of this Air Conditioner System.
It is the responsibility of the Installer of this System to review
each RV floor plan and determine the following:
A. Duct size
B. Duct layout
C. Register size
D. Register locations
E. Thermostat location.
These items must be determined in conjunction with the Air
Distribution System Sizing and Design Requirements listed.
ALTERNATE CONFIGURATIONS AND METHODS MAY
BE USED WHICH STILL ALLOW THE AIR CONDI-
TIONER TO OPERATE PROPERLY. HOWEVER, THESE
ALTERNATE CONFIGURATIONS AND METHODS
MUST BE APPROVED BY THE DOMETIC CORPORA-
TION IN WRITING.
The following instructions are based upon the use of
Dometic Return Air Kit. The electronic control kit has mount-
ing bolts supplied for use with this Kit.
Before preparing the ceiling opening, the type of system
options must be decided upon. If a remote sensor is to be
used, provision must be made for it. If the load shed option
(Energy Management System feature) is to be used, wires
must be run from the load shed control to the Dometic A/C. If
a furnace is to be connected, wires must be run from the
furnace to the Dometic A/C. Read all of the following
instructions before beginning the installation.
ROOF AND CEILING OPENING PREPARATION
1) A 14" x 14" opening must be cut through the roof and ceiling
of the RV. This opening must be located between the roof
and reinforcing members.
THERE MAY BE ELECTRICAL WIRING BETWEEN THE
ROOF AND THE CEILING. DISCONNECT ALL POWER
SUPPLIES AND THE POSITIVE (+ ) TERMINAL FROM THE
SUPPLY BATTERY. FAILURE TO FOLLOW THIS INSTRUC-
TION MAY CREATE A SHOCK HAZARD.
2) Mark a 14" x 14" square on the roof and carefully cut the
opening.
3) Using the roof opening as a guide, cut the matching hole
in the ceiling.
4) The opening created must be framed to provide ad-
equate support and prevent air from being drawn from
the roof cavity. Lumber 3/4" or more in thickness must
be used. Remember to provide an entrance hole for
power supplies, furnace wiring, 4-conductor telephone
cable, remote sensing and load shed options as de-
sired.
5) The 14" opening is part of the return air system of the Air
Conditioner and must be finished in accordance with NFPA
Standard 501C Section 2.7.
REGISTERS
4 MIN. — 8 MAX. (Per A/C)
14 SQ. IN. FREE AREA
PER REGISTER
14 INCH ROOF
OPENING
ROOF RAFTERS
AIR CONDITIONER
VEHICLE
FRONT
TOTAL OUTLET
AIR AREA MINIMUM:
17.5 sq. in. - 579 & 600 Series
21.0 sq. in. - 591, 595 & 630 & 595 Series
DUCTS MIN. MAX.
DEPTH (591,595, 630 Series) 1-1/2" 2-1/4"
(579, 600 Series) 1-1/4" 2-1/4"
WIDTH 7" — —
TOTAL LENGTH 12' 36'
SHORT RUN DUCT MIN. 1/3
TOTAL DUCT LENGTH