This unit is designed for OEM installation. All initial installations must be approved by Dometic, LLC
This manual must be read and
understood before installation,
adjustment, service, or mainte-
For Service Center
Assistance Call:
800-544-4881
nance is performed. This unit must
be installed by a qualied service
technician. Modification of this
product can be extremely hazardous and could result in personal
injury or property damage.
INSTALLATION INSTRUCTIONS
!
Lire et comprendre ce manuel avant de
procéder à l’installation, à des réglages,
de l’entretien ou des réparations.
L’installation de ce produit doit être
effectuée par un réparateur qualié.
Toute modication de ce produit peut
êtr e ext rê memen t dan ge re use et
entraîner des blessures ou dommages
matériels.
This manual has safety information and instructions to help users eliminate or reduce the risk
of accidents and injuries.
RECOGNIZE SAFETY INFORMATION
This is the safety alert symbol. It is used to alert
you to personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury or death.
UNDERSTAND SIGNAL WORDS
A signal word, when used with the safety alert
symbol, will identify a safety hazard and its level
of risk for personal injury. A signal word, without
the safety alert symbol, will be used for property
damage messages only.
WARNING indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION, used with the safety alert symbol, indicates a hazardous situation
which, if not avoided, could result in minor or
moderate injury.
NOTICE is used to address
practices not related to personal injury.
Read and follow all safety information and
instructions to avoid personal injury.
A.Product features or specications as described or il-
lustrated are subject to change without notice.
B. This Air Conditioner/Heat Pump (hereinafter referred
to as the "unit") Is Designed For:
1. Installation on a recreational vehicle at the time
the vehicle is manufactured.
2. Mounting on the roof of a recreational vehicle.
3. Roof construction with rafters/joists on minimum
of 16 inch centers.
4. Minimum of 2 inches and maximum of 5-1/2 inches
distance between roof to ceiling of recreational
vehicle. Alternate installation methods will allow
for roofs more than 5-1/2 inches thick.
C. The ability of this air conditioner to maintain the desired
inside temperature depends on the heat gain of the RV.
Some preventative measures taken by the occupants
of the RV can reduce the heat gain and improve the
performance of the air conditioner. During extremely
high outdoor temperatures, the heat gain of the vehicle
may be reduced by:
1. Parking the RV in a shaded area
2. Using window shades (blinds and/or curtains)
3. Keeping windows and doors shut or minimizing
usage
4. Avoiding the use of heat producing appliances
Operation on High Fan/Cooling mode will give optimum
or maximum efciency in high humidity or high outside
temperatures.
Starting the air conditioner early in the morning and giving
it a "head start" on the expected high outdoor ambient will
greatly improve its ability to maintain the desired indoor
temperature.
For a more permanent solution to high heat gain, accessories like Dometic outdoor patio and window awnings will
reduce heat gain by removing the direct sun. They also add
a nice area to enjoy company during the cool of the evening.
D. Condensation
Note: The manufacturer of this unit will not be responsible
for damage caused by condensed moisture on ceilings or
other surfaces. Air contains moisture and this moisture
tends to condense on cold surfaces. When air enters the
RV, condensed moisture may appear on the ceiling, windows, metal parts, etc. During normal operation this unit
removes moisture from the air. Keeping doors and windows
closed when this air conditioner is in operation will minimize
condensed moisture on cold surfaces.
* For wire length over 24 ft., consult the National Electric Code for proper sizing.
** Dometic, LLC gives GENERAL guidelines for generator requirements. These guidelines come from experiences people
have had in actual applications. When sizing the generator, the total power usage of your recreational vehicle must be
considered. Keep in mind generators lose power at high altitudes and from lack of maintenance.
*** CIRCUIT PROTECTION: Time Delay Fuse or Circuit Breaker Required.
3
Page 4
INSTALLATION INSTRUCTIONS
A. Precautions
FIG. 1
9-1/2"
Improper installation may damage equipment,
could endanger life, cause serious injury and/
or property damage.
1. Read Installation and Operating Instructions carefully before attempting to start this unit installation.
2. Dometic, LLC will not be liable for any damages
or injury incurred due to failure in following these
instructions.
3. Installation must comply with the National Electrical Code ANSI/NFPA-70 and CSA Standard C22.1
(latest edition) and any State or Local Codes or
regulations.
4. DO NOT add any devices or accessories to this
unit except those specically authorized in writing
by Dometic, LLC.
5. This equipment must be serviced by qualied
personnel and some states require these people
to be licensed.
B. Choosing Proper Location For The Unit
This unit is specically designed for installation on the
roof of a recreational vehicle (RV). When determining
your cooling requirements, the following should be
considered:
• Size of RV;
• Window area (increases heat gain);
• Amount of insulation in walls and roof;
• Geographical location where the RV will be used;
• Personal comfort level required.
1. For one unit installation: The unit should be mounted
slightly forward of center (front to back) and centered from side to side.
2. For two unit installations: Install one unit 1/3 and
one unit 2/3’s from front of RV and centered from
side to side.
It is preferred that the unit be installed on a relatively at and level roof section measured with the RV parked on a
level surface, but up to a 8° tilt is acceptable.
3. After Location Has Been Selected:
a. Check for obstructions in the area where unit
will be installed. See FIG. 1.
40"
29"
Dimensions Are Nominal
12"
Center Line
Of Unit
4"
Dimensions Are Nominal
Keep These Areas
Free Of Obstructions
14-1/4" x 14-1/4"
(± 1/8") Opening
Front
4"
b. The roof must be designed to support 130
pounds when the RV is in motion. Normally a
200 lb. static load design will meet this requirement.
It is the responsibility of the installer of this
system to ensure structural integrity of the
RV roof. Never create a low spot on the roof
where water will collect. Water standing
around the unit may leak into the interior
causing damage to the product and the RV.
c. Check inside the RV for return air grill ob-
structions (i.e. door openings, room dividers,
curtains, ceiling xtures, etc.) See FIG. 2.
FIG. 2
Front
3/4"
Dimensions Are Nominal
17"
14-1/4" x 14-1/4"
1-1/4"
(± 1/8") Opening
17"
17"
1-1/2"
1-3/4"
1-1/2"
17"
Dimensions Are Nominal
4
Page 5
C. Roof Preparation
1. Opening Requirements - Before preparing the ceiling opening, the type of system options must be
decided upon. Read all of the following instructions
before beginning the installation.
There may be electrical wiring between the
roof and the ceiling. Disconnect 120 VAC
power cord and the positive (+) 12 VDC terminal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
2. Mark a 14-1/4" x 14-1/4" (±1/8") square on the roof
and carefully cut the opening. The 14-1/4" x 14-1/4"
(±1/8") opening is part of the return air system of
the unit and must be nished in accordance with
ANSI A119.2.
3. Using the roof opening as a guide, cut the matching
hole in the ceiling.
4. The opening created must be framed to provide
adequate support and prevent air from being drawn
from the roof cavity. Framing stock 3/4" or more
in thickness must be used. Remember to provide
an entrance hole for power supplies, 3 conductor
communication cable, and furnace wiring (if applicable).
FIG. 3
D. Air Distribution Duct System Sizing & De-
sign (See Chart On Page 6)
It is the responsibility of the installer to insure
the duct work will not collapse or bend during and after the installation. Dometic, LLC
will not be liable for roof structural or ceiling
damage due to improperly insulated, sealed
or collapsed duct work.
The Installer of this system must design the air distri-
bution system for their particular application. Several
requirements for this system MUST be met for the unit
to operate properly. These requirements are as follows:
1. The duct material must meet or exceed any agency
or RVIA Standard that may be in existence at the
time the RV is produced.
2. All discharge air ducts must be properly insulated
to prevent condensation from forming on their
surfaces or adjacent surfaces during operation of
the unit. This insulation must be R-7 minimum.
FIG. 4
Frame
Duct
TOP VIEW
(BACK OF RV)
Frame
14-1/4" (±1/8")
Opening
AC Power
Supply Wire
Duct
Do Not Cut Roof
Structure Or
Rafters
3/4" Min.
Good-Rafters
Supported By
Cross Beams
Frame Opening So It
Good LocationBetween Roof
Rafters
Won't Collapse When
Bolting Down Unit
Leave Access For Power
Supply Wiring
15" Min. At
Front Of
Opening
It is the responsibility of the installer of this
system to ensure structural integrity of the
RV roof. Never create a low spot on the roof
where water will collect. Water standing
around the unit may leak into the interior
causing damage to the product and the RV.
Frame
Ceiling
3 Conductor
Communication
Cable
Duct
Insulation
Low Voltage Wires:
12 VDC
Furnace
Roof
Insulation
SIDE VIEW
(TOWARD BACK OF RV)
Duct
14-1/4" (±1/8")
Opening
3. Ducts and their joints must be sealed to prevent
condensation from forming on adjacent surfaces
during operation of the unit.
4. Return air openings must have 40 square inches
minimum free area including the lter.
5. Return air to the unit must be ltered to prevent
dirt accumulation on unit cooling surface.
6. Air Distribution System Installation
a. Dometic, LLC recommends the basic con-
guration shown on page 6, for installing this
system. We have found by testing, that this
conguration works best in most applications
of this system. It is the responsibility of the
installer of this system to review each RV oor
plan and determine the following:
5
Page 6
• Duct size
• Duct layout
• Register size
• Register location
• Thermostat location These items must be determined in conjunction
with the Air Distribution Duct System Sizing and
Design Requirements listed in the chart below.
Important: Alternate congurations and methods may
be used which still allow the unit to operate properly;
however, these alternate congurations and methods
must be approved by Dometic, LLC in writing. The following instructions are based upon the use of Return
Air Grill Kits 3105007.XXX & 3105935.XXX.
Air Distribution Duct Sizing & Design Chart For Ducted Applications
Roof Cavity Depth2.0 In. Min. - 5-1/2 In. Max.
Duct Cross Sectional Area21.0 Sq. In. Min.
Duct Size
Depth
Width
Total Duct Length
Duct Length (short run)
Register Requirements
Number Required Per Run
Register Free Air Area
Distance From Duct End
Distance From Elbow
Total System Static Air Pressure
Blower at High Speed,
Filter & Grill In Place
Return Air Grill Kit
3105007.XXX
3105935.XXX
1-1/2 In. Min. - 2-1/2 In. Max.
7.0 In. Min. - 10.0 In. Max.
15.0 Ft. Min. - 40.0 Ft. Max.
1/3 Total Duct Length
4 Min.
14.0 Sq. In.
5.0 In. Min. - 8.0 In. Max.
15.0 In.
0.12 - 0.65 In W.C.
Note: Duct sizes listed are inside dimensions.
FIG. 5
Duct Size And Requirements For 3105007.XXX And 3105935.XXX Return Air Grill
Register Required
Short Duct Run Minimum
1/3 Total Duct Length
Total Outlet Air Area
Minimum 21.0 Sq. In.
Ducts Min. Max.
Depth 1-1/2" 2-1/2"
Width 7.0" 10.0"
Total Length 15.0' 40.0'
Register Required
Note: Duct Size Is Inside Dimensions
Roof
Rafters
6
Register Required
Registers
8 Min. - 12 Max.
(Per Unit)
14 Sq. In. Free
Area Per Register
Register Required
14-1/4" x 14-1/4" (± 1/8")
Roof Opening
Page 7
E. Wiring Requirements
1. Route a copper, with ground, 120 VAC supply
wire from the time delay fuse or circuit breaker
box to the roof opening. The proper size wire can
be determined from chart on page 3.
a. This supply wire must be located in the front
portion of the 14-1/4" x 14-1/4" (±1/8") opening.
b. The power MUST be on an appropriately
sized separate time delay fuse or circuit
breaker. The proper size protection can be
determined from the chart on page 3.
c. Make sure that at least 15" of supply wire ex-
tends into the roof opening. This insures an
easy connection at the junction box.
d. Wiring must comply with the National Electri-
cal Code ANSI/NFPA-70 and CSA Standard
C22.1 (latest edition) and any State or Local
Codes or regulations.
e. Protect the wire where it passes into the
opening with approved method. See paragraph "d" above.
2. Route a dedicated 12 VDC supply wire (18-22
AWG) from the RV's converter (ltered side) or
battery to the roof opening.
a. This supply wire must be located in the front
portion of the 14-1/4" x 14-1/4" (±1/8") opening.
b. Make sure that at least 15" of supply wire ex-
tends into the roof opening.
3. Route a 3 conductor cable, 18 to 22 AWG, from
the Single Zone LCD (hereinafter referred to as
SZLCD) thermostat mounting position into the
14-1/4" x 14-1/4" (±1/8") roof opening. Make sure
that at least 15" of the wire extends into the roof
opening and 6" extend from the wall at the mounting position of the SZLCD thermostat. See Section F.
4. If system includes a gas furnace, route two 18
gauge thermostat wires from the furnace to the
roof opening of the unit that will control it. If more
than one furnace is to be used, route the second
set of thermostat wires to the second unit. Make
sure that 15" of wire extends into the opening.
F. Choosing Thermostat Location
The proper location of the thermostat is very impor-
tant to ensure that it will provide a comfortable RV
temperature. Observe the following rules when selecting a location:
1. Locate the thermostat 54" above the oor.
2. Install the thermostat on a partition, not on an outside wall.
3. NEVER expose the thermostat to direct heat from
lamps, sun or other heat producing items.
4. Avoid locations close to doors that lead outside,
windows or adjoining outside walls.
5. Avoid locations close to supply registers and the
air from them.
G. Thermostat and Thermostat Cable Instal-
lation
1. SZLCD Thermostat
Note: Wire colors listed for the three conductor cable
match the wire colors in the harness at the unit. Available
wire colors may vary.
FIG. 6
12V-
12V+
COMMS
a. Remove the cover from the SZLCD thermo-
stat. Depress tab on bottom of thermostat
and separate it from the base.
b. Insert the previously run three (3) conductor
cable through the hole in the base assembly.
c. Cut back the outer cable shield approximate-
ly 3 inches and strip 1/4" insulation from each
wire.
d. Mount the thermostat level on the wall using
the screws provided.
e. Make the following connections to the ther-
mostat. See FIG 6.
• Red/white wire to the 12V+ terminal
• Black wire to the 12V– terminal
• Orange wire to the "COMMS" terminal
f. Inspect all connections to make sure they are
tight and not touching any other terminals or
wires.
g. Push the wires back through the base into
the wall. Place cover on the thermostat and
push until an audible click is heard.
7
Page 8
H. Placing The Unit On The Roof
Personal injury hazard. This unit weighs approximately 100 pounds. To prevent back
injury, use a mechanical hoist to place unit
on roof. Failure to heed this warning could
cause severe personal injury.
1. Remove the unit from the carton and discard carton.
2. Place the unit on the roof.
3. Lift and place the unit over the prepared opening
using the gasket on the unit as a guide. See FIG.
7.
I. Installing The Unit
1. Check gasket alignment of the unit over the roof
opening and adjust if necessary. Unit may be moved
from below by slightly lifting. See FIG. 8.
FIG. 8
Center Unit From Below
Roof
Gasket
Property damage hazard. Do not slide the
unit. Failure to heed this warning may damage the neoprene gasket attached to the bottom and create a leaky installation.
FIG. 7
FRONT
4. Place the return air cover kit inside the RV. This
box contains mounting hardware for the unit and
will be used inside the RV.
This completes the outside work. Minor adjustments can
be done from inside the RV if required.
Lift And Place
Do Not Slide
2. Remove return air cover and ceiling template from
carton.
FIG. 9
Ceiling Template
Return Air
Grill
3. All models listed in this manual will use a four (4)
bolt pattern for installing the return air cover kit.
These bolts along with the Romex connector and
junction box cover are furnished in part number
3107180.006 (bolt kit) and is purchased separately.
4. Reach up into the return air opening and pull the
unit electrical cord down. Mount the junction box
with screws to the framing in front of the 14-1/4" x
14-1/4" (±1/8") opening . See FIG. 10.
FIG. 10Control
Divider Plate
Return Air
Cover
Cable
Low
Voltage
Wires
AC Power
Supply
Gasket
Mount Junction Box
To Front Of Opening
5. Install the Romex connector in the junction box.
6. Hold the ceiling template up to the 14-1/4" x 14-1/4"
(±1/8") opening. Be sure the large plate faces the
rear of the RV.
8
Page 9
7. Start each mounting bolt through the ceiling template and up into the unit base pan by hand. Install
wood screw in each end of the ceiling template.
This insures a tight t of the return air cover to
ceiling. See FIG. 11.
FIG. 11
Evenly tighten the four mounting bolts to a
Screws
torque of 40 to 50 inch pounds. This will compress the roof gasket approximately 1/2". The
bolts are self locking so further tightening is
not necessary. See FIG. 11.
Front of Vehicle
Finger
Tight
Roof
Gasket
Tighten To Compress Gasket To
1/2"
If bolts are left loose there may not be an adequate roof seal or if over tightened, damage
may occur to the unit base or ceiling template.
Tighten to torque specications listed in this
manual.
8. Installation of Divider Plate
a. Measure the ceiling to roof thickness:
• If distance is 2.0" - 3-3/4", remove perfo-
rated tab from divider plate.
• If distance is 3-3/4" - 5-1/2", remove no
tabs.
b. Remove the backing paper from double sided
tape located on ceiling template. See FIG. 12.
FIG. 12
Backing Paper
c. Place divider plate up to bottom of the unit base
pan rmly. The foam tape on the divider plate
must seal to bottom of base pan. See FIG. 13.
Improper installation and sealing of divider
plate will cause the compressor to quick cycle
on the cold control. This may result in fuse or
circuit breaker opening and/or lack of cooling.
FIG. 13
Push Divider Plate Firmly
Onto Base Pan
Note: The adhesive on the insulation is extremely sticky.
Be sure the part is located where desired before pressing
into place.
d. With slight pressure push the divider plate
against the double sided tape on the ceiling
template.
e. Locate the 1/8" x 7" x 18" self -adhesive insula-
tion supplied with the return air kit. Remove the
backing paper from the insulation and carefully
stick onto the ceiling template divider panel.
See FIG. 14.
FIG. 14
Place Insulation In Position
(Do Not Cover Unit Rating Plate)
Foam Tape
2.00" -3.75"
Divider Plate
• Excess width is intended to seal the divider
plate to the sides of the 14-1/4" x 14-1/4"
(±1/8") opening. This is to help prevent
cold air discharge from circulating into the
unit return air opening.
• If the insulation is too high, stick excess
height of insulation to the unit base pan.
Do not cover up unit rating plate.
9
Page 10
J. Wiring The System
Reach up into the return air opening and pull the re-
maining wires down. See FIG. 10.
1. Low Voltage Wire Connections
Disconnect the positive (+) 12 VDC terminal
at the supply battery. Damage to equipment
could occur if the 12 VDC is not shut off.
a. Connect the previously run +12 VDC supply
wire to the red wire protruding from the unit
return air opening.
b. Connect the previously run –12 VDC supply
wire to both the black wire protruding from
the unit return air opening and to wire of the
three wire cable that goes to the thermostat
12V– terminal.
c. Connect the previously run furnace thermostat
wires (if applicable) to the blue wires protruding from the return air opening. The polarity
of these connections does not matter.
d. Connect the red/white wire protruding from the
unit return air opening to wire of the three wire
cable that goes to thermostat 12V+ terminal.
e. Connect the orange wire protruding from the
return air opening to wire of the three wire cable
that goes to thermostat COMMS terminal.
2. 120 VAC Power Supply Connection
a. Route power supply line through Romex con-
nector and into junction box on side away from
the ceiling template. Tighten connector making
sure not to damage wires.
b. Connect white to white; black to black; and
green to green or bare copper wire using appropriate size connectors.
c. Tape the connectors to the supply wire to as-
sure they don’t vibrate off.
d. Push the wires into the box.
e. Install the cover onto the junction box.
K. Installing Decorative Inside Cover
1. Remove the return air grill from the return air cov-
er.
2. Place the return air cover up to the ceiling tem-
plate.
3. Install cover to template with #8 x 3/8" blunt point
Phillips head screws provided (6 required).
4. Reinstall lter return air grill into return air cover.
Align tabs with mating notches and snap into
place.
5. Install two hole plugs into screw holes in back of
return air cover. See FIG. 15.
FIG. 15
Hole
Plugs
Return Air
Cover
Return
Air Grill
Disconnect 120 VAC. Failure to obey these
instructions could create a shock hazard
causing death or severe personal injury.
Note: Wiring must comply with the National Electrical Code
ANSI/NFPA-70 and CSA Standard C22.1 (latest edition)
and any State or Local Codes or regulations.
This product is equipped with a 3 wire (grounded) system for protection against shock hazard. Make sure that the unit is wired and that
you connect into a properly grounded 120 VAC
circuit and the polarity is correct. Failure to
do so could result in death, personal injury
or damage to the equipment.
6. This completes the unit installation.
10
Page 11
WIRING DIAGRAM
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