Dometic Blizzard NXT H540315 User manual

Read these instructions carefully. These
instructions MUST stay with this product.
USA
SERVICE OFFICE
Dometic Corporation
1120 North Main Street
Elkhart, IN 46514
CANADA
Dometic Corporation
46 Zatonski, Unit 3
Brantford, ON N3T 5L8
CANADA
SERVICE CENTER &
DEALER LOCATIONS
Please Visit:
www.eDometic.com
RECORD THIS INFORMATION FOR FUTURE
REFERENCE:
Model Number
Serial Number
Date Purchased
This Unit is designed for OEM installation. All initial installations must be approved by Dometic Corporation.
Roof Top Unit Used With 3105007.XXX OR 3105935.XXX Return Air Grille
Description Blizzard NXTTM
Model
Electronic Control Kit Thermostat Optional Indoor
Temperature
Sensor
Air Conditioner
CCC 2 Controls H540315
H540316
3312020.000 3314082.000 CCC 2-Blk
3314082.011 CCC 2-Wht
3311931.000-20′
3311931.012-40′
3311931.020-60′
LCD SZ Controls H540315
H540316
3313189.000 C/F-Wht
3313189.015 C/F-Blk
3313192.000 C/F-Wht
3313192.019 C/F-Blk
N/A
REVISION A
Form No. 3316207.000 09/16
(French 3316208.000_A)
©2016 Dometic Corporation
LaGrange, IN 46761
INSTALLATION
INSTRUCTIONS

2
TABLE OF CONTENTS
INTRODUCTION....................................................................................................................................................................2
DOCUMENT SYMBOLS ........................................................................................................................................................2
IMPORTANT SAFETY INSTRUCTIONS................................................................................................................................3
A. Recognize Safety Information ...................................................................................................................................3
B. Understand Signal Words..........................................................................................................................................3
C. Supplemental Directives............................................................................................................................................3
D. General Safety Messages .........................................................................................................................................3
SPECIFICATIONS..................................................................................................................................................................4
A. Table - Unit Data........................................................................................................................................................4
B. Roof Requirements....................................................................................................................................................4
C. Table - Air Distribution Duct Sizing & Design.............................................................................................................4
INSTALLATION INSTRUCTIONS ..........................................................................................................................................5
A. Choosing Proper Location For Unit ...........................................................................................................................5
B. Roof Preparation .......................................................................................................................................................5
C. Air Distribution Duct Sizing & Design ........................................................................................................................6
D. Wiring Requirements .................................................................................................................................................7
E. Choosing Thermostat Location..................................................................................................................................8
F. Thermostat, Optional Indoor Temperature Sensor & Thermostat Communication Cable Installation ......................8
G. Placing Unit On Roof .................................................................................................................................................9
H. Installing Unit ...........................................................................................................................................................10
I. LCD SZ System Low Voltage Wire Connections.....................................................................................................12
J. CCC 2 System Low Voltage Wire Connections.......................................................................................................12
K. 120 Vac Power Supply Connection .........................................................................................................................13
L. SystemConguration ..............................................................................................................................................13
M. Installing Return Air Cover.......................................................................................................................................14
N. (CCC 2 System Only) Reset & Checkout ................................................................................................................14
O. (CCC 2 System Only) Furnace /Aqua Temperature Differential Setting..................................................................14
GENERAL INFORMATION...................................................................................................................................................15
A. Heat Gain ................................................................................................................................................................15
B. Condensation ..........................................................................................................................................................15
WIRING DIAGRAMS............................................................................................................................................................16
A. Simple RV Wiring Diagram......................................................................................................................................16
B. Unit Wiring Diagrams...............................................................................................................................................17
C. Electronic Control Kit Wiring Diagrams ...................................................................................................................17
INTRODUCTION
This air conditioner (hereinafter referred to as “unit” or “product”) is designed and intended for installation on the roof of a
Recreational Vehicle (hereinafter referred to as RV) during the time it is manufactured.
This unit can be installed by one person with brief help from additional personnel. Use these instructions to ensure a properly
installed, and properly functioning product.
DometicCorporationreservestherighttomodifyappearancesandspecicationswithoutnotice.
DOCUMENT SYMBOLS
Indicates additional information that is NOT related
to physical injury. Indicates step-by-step instructions.

3
The installation MUST comply with all ap-
plicable local and national codes, including
the latest edition of the following standards:
U.S.A.
●ANSI/NFPA70, National Electrical Code
(NEC)
●ANSI/NFPA 1192, Recreational Vehicles
Code
CANADA
●CSA C22.1, Parts l & ll, Canadian Electri-
cal Code
●CSA Z240 RV Series, Recreational
Vehicles
D. General Safety Messages
 Failure to obey the following warn-
ings could result in death or serious injury:
●This product MUST be [installed / serviced] by a
qualiedservicetechnician.
●Do NOT modifythisproductinanyway.Modica-
tion can be extremely hazardous.
●Do NOT add any devices or accessories to this
product except those specically authorized in
writing by Dometic Corporation.
This manual has safety information and instructions to help
you eliminate or reduce the risk of accidents and injuries.
A. Recognize Safety Information
This is the safety alert symbol. It is used to
alert you to potential physical injury hazards.
Obey all safety messages that follow this
symbol to avoid possible injury or death.
B. Understand Signal Words
A signal word will identify safety messages and
property damage messages, and will indicate the
degree or level of hazard seriousness.
 indicates a hazardous situation that,
if NOT avoided, could result in death or serious in-
jury.
 indicates a hazardous situation that,
if NOT avoided, could result in minor or moderate
injury.
 is used to address practices NOT
related to physical injury.
C. Supplemental Directives
Read and follow all safety information and
instructions to avoid possible injury or death.
Read and understand these instructions be-
fore [installing / using / servicing / performing
maintenance on] this product.
Incorrect [installation / operation / servicing /
maintaining] of this product can lead to seri-
ous injury. Follow all instructions.
IMPORTANT SAFETY INSTRUCTIONS

4
A. Table - Unit Data
Model No. Nominal
Capacity
(BTU HR)
Cooling
Electrical
Rating
120 Vac
60 Hz 1 ph
Compressor
Rated Load
Amps
Compressor
Locked
Rotor
Amps
Fan Motor
Rated Load
Amps
Fan Motor
Locked
Rotor
Amps
Refrigerant
R-410A
(oz)
Minimum
Wire Size*
12 AWG
Copper
Up to 24'
AC Circuit
Protection
***Installer
Supplied
Minimum
Generator
Size**
1 Unit / 2 Units
H540315.72X 13,500 12.7 68.0 2.8 8.0 19.5 20 Amp 3.5 kW / 5.0 kW
H540316.72X 15,000 13.2 70.0 2.8 8.0 21.0 20 Amp 3.5 kW / 5.0 kW
* For wire length over 24 ft., consult the National Electrical Code for proper sizing.
** Dometic Corporation 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 RV 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.
B. Roof Requirements
● A14-1/4″x14-1/4″(±1/8″)squareopening(hereinafterreferredtoas“roofopening”)isrequiredforinstallingthis
unit. This opening is part of the return air system of the unit and MUSTbenishedinaccordancewithNFPA1192.
●Roof construction with rafters/joists support frames on a minimum of 16 inch centers.
●Minimum of 2 inches and maximum of 5 inches distance between roof to ceiling of RV.
C. Table - Air Distribution Duct Sizing & Design
Return Air Grille Kit
3105007.XXX
3105935.XXX
Roof Cavity Depth 2.0 In. Min. - 5 In. Max.
Duct Cross Sectional Area 21.0 Sq. In. Min.
Duct Size
Depth
Width
Total Duct Length
Duct Length (short run)
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
Register Requirements
Number Required
Supply Register Free Air Area
Return Register Free Air Area
Distance From Duct End
Distance From Elbow
4 Min.
14.0 Sq. In.
40.0 Sq. In.
5.0 In. Min. - 8.0 In. Max.
15.0 In.
Total System Static Air Pressure
Blower at High Speed,
Filter & Grille In Place
0.55 - 1.10 In. W.C.
SPECIFICATIONS

5
A. Choosing Proper Location For Unit
Thisunitisspecicallydesignedforinstallationontheroof
of an 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. See table below for maximum acceptable tilt.
Model
Number
Max Tilt
(All Directions)
H540315
H540316
15°
3. After Location Has Been Selected:
a. Check for obstructions in the area where unit
will be installed. See (FIG. 1).
FIG. 1 Dimensions Are Nominal
Keep These Air
Flow Areas Free
Of Obstructions
Front
Center Line Of Unit
Roof Opening
13-7/8″
40″ 30″
4″
18″ 4″
b.  Maintain structural integrity.
Otherwise damage to product and/or RV
could occur.
The roof must be designed to support 130
pounds when RV is in motion. Normally a
200 lb. static load design will meet this re-
quirement.
c. Check inside the RV for return air grille (here-
inafter referred to as “RAG”) obstructions
(i.e. door openings, room dividers, curtains,
ceilingxtures,etc).See(FIG.2).
FIG. 2
1-1/2″
Dimensions Are Nominal
3/4″
17″
17″
1-1/4″
1-1/2″
17″
1-3/4″
Roof
Opening
17″
B. Roof Preparation
1.  FIRE OR ELECTRICAL SHOCK
HAZARD. Make sure there are no obstacles
(wires, pipes, etc.) inside RV’s [roof / oor /
walls]. Shut OFF gas supply, disconnect 120
Vac power from RV, and disconnect positive (+)
12 Vdc terminal from supply battery BEFORE
drilling or cutting into RV. Failure to obey these
warnings could result in death or serious injury.
Opening Requirements - Before preparing
the ceiling opening, the type of system op-
tions MUST be decided upon. Read all of
the following instructions before beginning
the installation.
2. Carefully mark and cut the required roof opening.
See "B. Roof Requirements" on page (4).
3. Using the roof opening as a guide, cut the match-
ing hole in the ceiling.
INSTALLATION INSTRUCTIONS

6
Frame
DuctDuct
Frame
Frame
Roof Opening
Roof Opening
Roof SIDE VIEW
(TOWARD BACK OF RV)
Duct Ceiling
Duct
Insulation
TOP VIEW
(BACK OF RV)
FIG. 4
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 Corporation recommends the basic
congurationshownin(FIG.5),forinstalling
this system. We have found by testing, that
thiscongurationworksbestinmostapplica-
tions. It is the responsibility of the installer to
revieweachRVoor plantodetermine the
following:
●Duct size
●Duct layout
●Register size
●Register location
●Thermostat location
●Indoor Temperature Sensor Location
These items must be determined in conjunc-
tion with the Air Distribution Duct System
Sizing & Design requirements. See "C. Table
- Air Distribution Duct Sizing & Design" on
page (4).
Alternatecongurationsand methods
may be used which will allow the unit
to operate properly; however, these
alternate congurations and methods
MUST be approved by Dometic Cor-
poration in writing. The following in-
structions are based upon the use of
RAG Kits 3105007.XXX & 3105935.
XXX.
4.  Maintain structural integrity. Oth-
erwise damage to product and/or RV could oc-
cur.
 NEVER create a low spot on RV
roof. Otherwise, water will pool and could cause
a leak.
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,
indoor temperature sensor (if applicable), ther-
mostat communication cable, and furnace wires
(if applicable) at the front of the opening. See
(FIG. 3).
3/4″ Min.
Do Not Cut Roof
Structure Or
Rafters
Good-Rafters
Supported By
Cross Beams
Good Location
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
FIG. 3
15″ Min. At
Front Of
Opening
Leave Access For
Power Supply Wiring
C. Air Distribution Duct Sizing & Design
The installer of this system must design the air distribution
system for their particular application. Several requirements
must be met for the unit to operate properly. These require-
ments are as follows:
1.  Make sure ductwork will NOT
bend or collapse during and after installation,
and that it is correctly insulated and sealed.
Otherwise, damage to roof structure and ceiling
could occur.
2. All discharge air ducts must be properly insu-
lated to prevent condensation from forming on
their surfaces or adjacent surfaces during op-
eration of unit. This insulation must be R-7 mini-
mum. See (FIG. 4).
3. Ducts and their joints must be sealed to prevent
condensation from forming on adjacent surfaces
during operation of the unit.
INSTALLATION INSTRUCTIONS

7
INSTALLATION INSTRUCTIONS
FIG. 5 Duct Size And Requirements For 3105007.XXX And 3105935.XXX RAG
Register Required
Registers
8 Min - 12 Max.
(Per Unit)
14 Sq. In. Free
Area Per Register
D. 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. Use a listed/certied
non metallic - sheathed single strand cable. See
"A. Table - Unit Data" on page (4).
a. This supply wire must be located in the front
portion of the roof opening.
b. The power MUST be on an appropriately
sized separate time delay fuse or circuit
breaker. See "A. Table - Unit Data" on page
(4).
c. Make sure that at least 15″ of supply wire
extends into the roof opening This ensures
an easy connection at the junction box.
d. Protect the wire where it passes into the
opening with approved method.
2. Route a dedicated 12 Vdc supply wire (18-22
AWG) from the RV converter (ltered side) or
battery to the roof opening.
When a Comfort Control Center 2 (here-
in-after referred to as CCC 2) thermostat
is being installed with more than 2 zones,
route a dedicated 12 Vdc supply wire (18-
22 AGW) to zone 1 and zone 3 roof open-
ing.
a. This supply wire must be located in the front
portion of the roof opening.
b. Make sure that at least 15″ of supply wire
extends into the roof opening.
3. Thermostat Communication Cable
a. CCC 2 Thermostat
I. Route a 4 conductor communication ca-
ble from the roof opening to the thermo-
stat mounting location using the shortest
most direct route. Make sure that at least
15″ofthewireextendsintotheroofopen-
ing and 6″ extends from the wall at the
thermostat mounting location. See "E.
Choosing Thermostat Location" on page
(8).
When more than one unit is being
installed (additional zones) with the
CCC 2 thermostat, an additional
4 conductor communication cable
MUST be routed to each additional
unit roof opening. Make sure that
atleast15″ofthewireextendsinto
the roof opening. See (FIG. 27).
b. LCD SZ Thermostat
I. Route a 3 conductor communication ca-
ble, 18 to 22 AWG, from the roof open-
ing to the Liquid Crystal Display Single
Zone (hereinafter referred to a LCD SZ)
thermostat mounting location. Make sure
thatatleast15″ofthewireextends into
theroofopeningand6″extendsfromthe
wall at the thermostat mounting location.
See "E. Choosing Thermostat Location"
on page (8).

8
INSTALLATION INSTRUCTIONS
4. (CCC 2 system only) Optional Indoor Tempera-
ture Sensor
a. Route an indoor temperature sensor (option-
al) from the roof opening to the indoor tem-
perature sensor location. The 2 pin connec-
tor end goes to the roof opening. See indoor
temperature sensor installation instructions
for proper sensor location.
5. 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 at least 15″ of wire extends into the
opening.
6. (CCC 2 system only) If an Energy Management
System (load shed feature) is to be used with
the control, two wires must be routed to the
roof opening of the zone to be managed. The
signal required for this function is normally an
open relay contact. When the EMS calls for the
compressor to shut off, the relay contacts should
close. Make sure that at least 15″ of the EMS
wire extends into the roof opening.
7. (CCC 2 system only) If an Automatic Generator
Start (AGS) kit will be installed, an additional 4
conductor communication cable must be routed
from the last unit to the location of the AGS kit.
Follow AGS kit instructions for installation.
E. Choosing Thermostat Location
1. CCC 2 system without an optional indoor tem-
perature sensor and LCD SZ system
a. The proper location of the thermostat is very
important to ensure that it will provide a com-
fortable RV temperature. Observe the follow-
ing rules when selecting a location.
● Locatethethermostat54″abovetheoor.
●Install the thermostat on a partition, not
on an outside wall.
●NEVER expose the thermostat to direct
heat from lamps, sun, or other heat pro-
ducing items.
●Avoid locations close to doors that lead
outside, windows, or adjoining outside
walls.
●Avoid locations close to supply registers
and the air from them.
2. CCC 2 system with an optional indoor tempera-
ture sensor in ALL zones
a. The thermostat may be mounted anywhere
in the RV that is convenient. Try to avoid
hard to reach and hard to see areas.
I. Refer to the instructions provided with the
indoor temperature sensor for details of
installation.
F. Thermostat, Optional Indoor
Temperature Sensor & Thermostat
Communication Cable Installation
1. CCC 2 System
a. The previously run communication cable (4
conductor telephone cable) must be termi-
nated with two (2) RJ-11-6C4P telephone
connectors. Refer to the crimp tool manufac-
turer for crimping instructions. See (FIG. 6)
& (FIG. 7).
RJ-11-6C4P connectors MUST be in-
stalled as shown in (FIG. 6) & (FIG. 7).
FIG. 6
FIG. 7
RJ-11-6C4P Connector
Pin 1
Black Red Green Yellow
Black Red Green Yellow
Flat Four Conductor
Communication Cable
FIG. 8
CCC 2 Thermostat
(Rear View)
Wall
2" Diameter
Communication Cable

9
2. LCD SZ System
Wire colors listed for the communication
cable (3 conductor cable) match the wire
colors in the unit wire harness and the wire
harness at the LCD SZ electronic control
box. Available wire colors may vary.
a. Remove the cover from the LCD SZ thermo-
stat. Depress tab on bottom of thermostat
and separate it from the base.
b. Insert the previously run communication ca-
ble (3 conductor cable) through the hole in
the base assembly.
c. Cut back the outer cable shield approxi-
mately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. 11).
FIG. 11
12-
COMMS
12+
●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 termi-
nals 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.
G. Placing Unit On Roof
1. Remove the unit from the carton and discard
carton.
2.  LIFTING HAZARD. Use proper
lifting technique and control when lifting product.
Failure to obey this caution could result in injury.
Place unit on roof.
3.  Do NOT slide unit. Otherwise,
damage to gasket (on bottom of unit) may occur,
b. Route the communication cable through the
2" diameter hole in the wall required for the
thermostat. See (FIG. 8).
c. Optional Indoor Temperature Sensor
I. Refer to the instructions provided with the
indoor temperature sensor for details of
installation.
d. Thermostat Installation
I. Carefully separate the thermostat base
plate from the thermostat cover. Insert a
small screw driver into the slot on bottom
of thermostat and disengage the tab. See
(FIG. 9).
FIG. 9
Disengage Tab
CCC 2 Thermostat
II. Insert the 4 conductor communication ca-
ble through the hole in base plate. Align
thermostat base plate with hole in wall.
Make sure base plate is level and attach
base plate to wall using the four (4) sup-
plied screws.
III. Insert the 4 conductor communication
cable connector (RJ-11-6C4P) into the
connector on the back of the thermostat.
See (FIG. 10).
FIG. 10
4 Conductor
Communication Cable
IV. Align the thermostat with the back plate
and snap into position.
INSTALLATION INSTRUCTIONS

10
INSTALLATION INSTRUCTIONS
and could cause a leak.
Lift and place the unit over the prepared open-
ing using the gasket on the unit as a guide. See
(FIG. 12).
FIG. 12
Do Not Slide
Lift And Place
Front
4. Place the electronic control box kit and the RAG
kit inside the RV. These boxes contain 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.
H. Installing 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. 13).
FIG. 13 Center Unit From Below
Roof Gasket
2. Remove return air cover and ceiling template
from carton. See (FIG. 14).
FIG. 14 Divider Plate
Return Air
Cover
Ceiling
Template
Return Air
Grille
3. All models listed in this manual will use a four
(4) bolt pattern for installing the RAG kit. These
bolts and the electronic control box cover are
furnished in the CCC 2 control kit.
4. Reach up into the return air opening and pull the
unit electric cord down for later connection. See
(FIG. 15).
FIG. 15
Gasket
Furnace
Wires
Electrical
Cord
120 Vac
Power
Supply
Control
Cables
5. Hold the ceiling template up to the roof opening.
Make sure the large plate faces the rear of the
RV. See (FIG. 16).
a. 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 ensures a tight t of
the return air cover to ceiling. See (FIG. 16).
b.  Tighten mounting bolts to
correct torque specications. Overtighten-
ing could damage unit’s base pan or ceiling
template. Not enough torque will allow an in-
adequate roof seal, and could cause a leak.
Tighten all four (4) mounting bolts EVENLY
with in 40 to 50 inch pounds. See (FIG. 16).
This will compress the roof gasket to
approximately3/4″.

11
Place the divider plate up to bottom of the
unitbasepanrmly.Thefoamtapeonthedi-
vider plate must seal to bottom of base pan.
See (FIG. 18).
FIG. 18
Push Divider Plate Firmly
Onto Base Pan
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insu-
lation supplied with the RAG kit. Remove the
backing paper from the insulation and care-
fully stick onto the ceiling template divider
plate. See (FIG. 19).
FIG. 19
Foam Tape
Place Insulation In Position
(Do Not Cover Unit Rating Plate)
Divider Plate
●Excess width is intended to seal the di-
vider plate to the sides of the roof open-
ing. This is to help prevent cold air dis-
charge from circulating into the unit return
air opening.
●If the insulation is too high, stick excess
height of the insulation to the unit base
pan. Do not cover up unit rating plate.
f. Place the electronic control box on the ceil-
ing template with the white 6 pin plug on the
curb side of the RV. Do NOT attach at this
time.
FIG. 16 Front Of Vehicle
Tighten To
Compress
Gasket To
3/4″
Roof
Gasket
Screws
6. 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. See (FIG. 17).
● 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. 17).
FIG. 17 Paper Backing
2.00″ - 3.75″
c.  Divider plate MUST be in-
stalled correctly. Incorrect installation could
cause compressor to quick-cycle, and could
result in supply circuit overload and reduced
product performance.
The adhesive on the double-sided
tape is extremely sticky. Make sure
the divider plate is properly positioned
before pressing into place.
INSTALLATION INSTRUCTIONS

12
I. LCD SZ System Low Voltage Wire
Connections
Reach up into the return air opening and pull down the
remaining wires. See (FIG. 15).
 Make sure the positive (+) 12
Vdc terminal is disconnected from supply bat-
tery. Otherwise, damage to unit could occur.
1. Connect the previously run +12 Vdc supply wire
to the red wire to the red wire at the electronic
control box.
2. Connect the previously run –12 Vdc supply wire
to both the black wire to the black wire at the
electronic control box and to the wire of the three
wire cable that goes to the thermostat 12V– ter-
minal.
3. Connect the previously run furnace thermostat
wires(ifapplicable)tothebluewirestothe1/4″
connectors at the electronic control box using
thesupplied1/4″insulatedconnectors.Thepo-
larity of this connection does not mater.
4. Connect the red/white wire at the electronic con-
trol box to the wire of the three wire cable that
goes to the thermostat 12V+ terminal.
5. Connect the orange wire at the electronic control
box to the wire of the three wire cable that goes
to the thermostat COMMS terminal.
J. CCC 2 System Low Voltage Wire
Connections
Reach up into the return air opening and pull down the
remaining wires. See (FIG. 15).
 Make sure the positive (+) 12
Vdc terminal is disconnected from supply bat-
tery. Otherwise, damage to unit could occur.
1. Connect the previously run 12 Vdc wires to the
red and black wires in the 6 wire harness. Con-
nect +12 Vdc to the red wire; –12 Vdc to the
black wire.
2. Connect the previously run furnace wires (if ap-
plicable) to the blue wires in the 6 wire harness.
3. Terminate the 4 conductor communication
cable(s) protruding from the roof opening. The
cable(s) must be terminated with a telephone
RJ-11-6C4P connector. Refer to the crimp tool
manufacturer for crimping instructions.
RJ-11-6C4P connectors MUST be in-
stalled as shown in (FIG. 6) & (FIG. 7).
4. Plug the 4 conductor communication cable into
one of the RJ-11-6C4P telephone couplers in
the electronic control box. If more than one zone
is used, the second coupler is used to join each
additional zone.
g. Plug the 6 pin electrical cord from the unit
into the matching 6 pin connector in the elec-
tronic control box. The plug is polarized and
willonlytinonedirection.
h. Plug the freeze control into the matching
black 2 pin connector in the electronic con-
trol box.
i. Insert the freeze control sensor into the
evaporator coil ns approximately 2-1/2″
abovethebottomofthecoilnsandin2-1/2″
fromtherightside.See(FIG.20).Bendns
over sensor to secure in place.
FIG. 20
Route Up Through
Return Air Opening
Remove
Hang Tag
Freeze
Control
Sensor
j. Plug the 6 wire harness into the matching 6
pin connector in the electronic control box.
k. Attach electronic control box to the ceiling
template using the two (2) blunt self-tapping
screws provided in the electronic control box
kit. See (FIG. 21).
FIG. 21
Front
Curb Side
Electronic
Control Box
Blunt Self-Tapping Screw
INSTALLATION INSTRUCTIONS

13
FIG. 22
Electronic Control Box
Dip
Switches
FIG. 23 Dip Switches
Zone 2
Ext. Stage
Zone 3
Zone 4
Stage
Heat Strip
Heat Pump
Furnace
Dehumidify
Gen Start
a. Ext. Stage - Ext. Stage is not used on this
unit. Leave in the "OFF" position.
b. Zone selection - Each CCC 2 thermostat can
have up to 4 zones. When only one unit is in-
stalled it becomes Zone 1 and no dip switch
setting is required. Each additional unit must
be assigned a zone (2 through 4). Each unit
must have a different zone setting.
c. Stage selection - Stage is not used on this
unit. Leave in the "OFF" position.
d. Heat Strip - Heat strip is not used in these
models. Leave in the "OFF" position.
e. Heat Pump - On heat pump models the #7
dip switch is in the "ON" position from the
factory. Non heat pump models leave in the
"OFF" position.
f. Furnace - If a Furnace/Aqua heat system
has been connected to this unit, the furnace
dip switch must be placed in the "ON" posi-
tion.
g. Dehumidify - Dehumidify is not used on this
unit. Leave in the "OFF" position.
5. Plug the indoor temperature sensor cable (if ap-
plicable) into the P4 (white) 2 pin matching con-
nector in the electronic control box.
6. Connect the previously run Energy Manage-
ment System wires (if applicable) to the yellow
wires in the 6 wire harness. The polarity of these
connections does not matter.
7. If an Automatic Generator Start (AGS) kit is in-
stalled, follow installation instructions furnished
with AGS kit.
K. 120 Vac Power Supply Connection
 ELECTRICAL SHOCK HAZARD.
Make sure 120 Vac power is disconnected from
RV. Failure to obey this warning could result in
death or serious injury.
 ELECTRICAL SHOCK HAZARD.
Provide grounding in compliance with all appli-
cable electrical codes. Failure to obey this warn-
ing could result in death or serious injury.
1. Route the previously run 120 Vac power supply
wire through the strain relief and into the junc-
tion box. Tighten strain relief making sure not to
damage wires. Leave enough wire inside junc-
tion box to connect to unit 120 Vac wires.
2. Connect white to white; black to black; and green
to green or bare copper wire using appropriate
size connectors.
3. Tape the connectors to the supply wire to ensure
they don't vibrate loose.
4. Push the wires into the electronic control box.
L. System Conguration
Now that the system is installed, it is necessary to do a
systemconguration.
1. ElectronicControlConguration
Depending on the equipment options installed
by the RV manufacturer, the appropriate dip
switches will need to be switched to the "ON"
position. Placing the switch in the "ON" position
selects that option. See (FIG. 22) & (FIG. 23) &
(FIG. 24).
Dip switches are in the "OFF position
when shipped from the factory except heat
pump models. On these models the ap-
propriate dip switch is in the "ON" position
from the factory. They are visible through
the opening in the electronic control box.
See (FIG. 23).
INSTALLATION INSTRUCTIONS

14
a. Re-connect the 12 Vdc and 120 Vac power
supplies.
b. Make sure the CCC 2 thermostat is in the
OFF mode.
c. Simultaneously press the MODE and Zone
buttons. The LCD will display "Init" and all
available zones.
d. Release the MODE and Zone buttons.
e. Press the ON/OFF button to exit system set
up.
f. When a dip switch is turned on after initial
configuration, a system reset will need to be
done before the CCC 2 thermostat will rec-
ognize the updated selection.
2. System Checkout
a. Verify that all features of the installed sys-
tem work. See CCC 2 thermostat Operating
Instructions or User's Guide. Check the fan
mode, cooling mode, heating mode (if ap-
plicable), and furnace mode (if applicable)
operation. If the features do not work discon-
nect the 120 Vac and 12 Vdc power supplies
and verify that all wiring is correct and that
the correct dip switches have been set to the
"ON" position.
O. (CCC 2 System Only) Furnace /Aqua
Temperature Differential Setting
ThissystemcanbeconguredtooperateusinganON/OFF
differential of either 1 degree F or 2 degree F. See (FIG. 26).
1. To set the differential, simultaneously press
the PROGRAM button and the up button
on the CCC 2 thermostat. "diF1" will appear in
the display while the buttons are pressed. See
(FIG. 26). To set the 2 degree differential, simul-
taneously press the PROGRAM button and the
down button. "diF2" will appear in the display
while the buttons are pressed.
FIG. 26
h. Gen Start selection - Leave in the "OFF" po-
sition.
i. Install electronic control box cover.
j. Repeat this procedure for each additional
zone.
FIG. 24
On Position
Off Position
M. Installing Return Air Cover
1. Remove the return air grille from the return air
cover.
2. Place the return air cover up to the ceiling tem-
plate.
3. Install cover to template using six (6) supplied
#8x3/8″bluntpointPhillipsheadscrews.
4. Reinstalllterreturnairgrilleintoreturnaircov-
er. Align tabs with mating notches and snap into
place.
5. Install two (2) hole plugs into screw holes in
back of return air cover. See (FIG. 25).
FIG. 25
Hole Plug
Return Air
Grille
Return Air
Cover
N. (CCC 2 System Only) Reset & Checkout
1. System Reset
After setting the dip switches in the electronic
control, do a system reset.
INSTALLATION INSTRUCTONS

15
A. Heat Gain
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 tem-
peratures, the heat gain of the RV can 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. Avoid the use of heat producing appliances
Operation on High Fan/Cooling mode will give optimum
or maximum efciency 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, acces-
sories 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.
GENERAL INFORMATION
B. Condensation
The manufacturer of this unit will not be responsible for
damage caused by condensation forming on ceilings,
windows, or other surfaces. Air contains water vapor which
condenses when temperature of a surface is below Dew
point. During normal operation this unit is designed to
remove a certain amount of moisture from the air, depend-
ing on the size of the space being conditioned. Keeping
doors and windows closed when this air conditioner is in
operation will greatly reduce the chance of condensation
forming on interior surfaces.

16
A. Simple RV Wiring Diagram
(OPTIONAL)
FIG. 27
WIRING DIAGRAMS

17
WIRING DIAGRAMS
B. Unit Wiring Diagrams
1. H540315 & H540316 Wiring Diagram
FIG. 28
C. Electronic Control Kit Wiring Diagrams
1. 3312020.000 CCC 2 Electronic Control Kit
Wiring Diagram
FIG. 29
2. 3313189.000 & 3313189.015 LCD SZ Electron-
ic Control Kit Wiring Diagram Cool/Furnace
FIG. 30