Dometic 640312.80X, 640312.83X, 640315.30X, 640312C85X, 640315C35X Installation And Operating Instructions Manual

USA

SERVICE OFFICE
Dometic Corporation
1120 North Main Street
Elkhart, IN 46514

RECORD THIS UNIT INFORMATION
FOR FUTURE REFERENCE:
Model Number
Serial Number
ADB Number
ADB Serial Number
Date Purchased

Roof Top Unit

Description Model Use With Air Distribution Box

Model Control Electric Heat

Air Conditioner 640312

640315

Note: Installation requires a #2 Phillips screwdriver
with 9/32" maximum diameter x 1-1/4" minimum length.

3310741.XXX Integral Mechanical N/A

CANADA

Dometic Corporation
46 Zatonski, Unit 3
Brantford, Ontario
CANADA N3T 5L8

This manual must be read and

For Service Center &
Dealer Locations
Please Visit:

www.eDometic.com

understood before installation,
adjustment, service, or mainte­nance is performed. This unit must

be installed by a qualied service

technician. Modification of this
product can be extremely hazard­ous and could result in personal
injury or property damage.

INSTALLATION & OPERATING

INSTRUCTIONS

REVISION A

Form No. 3312501.012 08/16
(French 3312703.014_A)
©2016 Dometic Corporation
LaGrange, IN 46761

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 qualié.
Toute modication de ce produit peut

être extrêmement dangereuse et
entraîner des blessures ou dommages
matériels.

640312.30X
640312C35X

640312.80X

640312.83X
640312C85X

640315.30X

Read these instructions carefully. These
instructions MUST stay with this product.

MODELS

640315C35X

640315.80X

640315.83X

640315.84X
640315C85X

IMPORTANT SAFETY INSTRUCTIONS

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 hazard-

ous situation which, if not avoided, could result

in death or serious injury.

CAUTION, used with the safe-

ty 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.

GENERAL INFORMATION

A. Product features or specications as described or il-

lustrated are subject to change without notice.

B. This air conditioner (hereinafter referred to as the

"unit") is designed for:

1. Installation on a recreational vehicle during or af­ter 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 1 inch and maximum of 5-1/2 inches

distance between roof to ceiling of recreational

vehicle.

C. The ability of the air conditioner to maintain the de-

sired 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 RV

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 efciency in high humidity or high outside

temperature.

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 a high heat gain, ac­cessories like Dometic outdoor patio and window awnings

will reduce heat gain by removing the direct exposure to
the sun. They also add a nice area to enjoy company dur-

ing 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.

2

SPECIFICATIONS

Model No. Nominal

640312.30X 11,000 10.5 53.0 3.5 10.0 19.0 20 Amp 3.5 KW / 5.0 KW

640312C35X 11,000 10.5 53.0 3.5 10.0 19.0 20 Amp 3.5 KW / 5.0 KW

640312.80X 11,000 11.5 53.0 2.6 8.5 20.0 20 Amp 3.5 KW / 5.0 KW

640312.83X 11,000 12.5 63.0 2.6 8.5 18.0 20 Amp 3.5 KW / 5.0 KW

640312C85X 11,000 11.5 53.0 2.6 8.5 20.0 20 Amp 3.5 KW / 5.0 KW

640315.30X 13,500 12.5 61.0 3.5 10.0 17.5 20 Amp 3.5 KW / 5.0 KW

640315C35X 13,500 12.5 61.0 3.5 10.0 17.5 20 Amp 3.5 KW / 5.0 KW

640315.80X 13,500 12.6 63.0 2.6 8.5 18.0 20 Amp 3.5 KW / 5.0 KW

640315.83X 13,500 12.5 63.0 2.6 8.5 19.0 20 Amp 3.5 KW / 5.0 KW

640315.84X 13,500 12.5 63.0 3.5 8.5 19.0 20 Amp 3.5 KW / 5.0 KW

640315C85X 13,500 12.6 63.0 2.6 8.5 18.0 20 Amp 3.5 KW / 5.0 KW

Capacity

(BTU HR)

Cooling

Electrical

Rating

120 VAC

60Hz. 1PH

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

* For wire length over 24 ft., consult the National Electric 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 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

INSTALLATION INSTRUCTIONS

FIG. 1

A. Precautions

PERSONAL INJURY HAZARD. Failure to obey
these installation instructions may cause seri­ous personal injury and/or property damage.

1. Read installation and operating instructions care­fully before attempting to start this unit installa­tion.

2. Dometic Corporation will not be liable for any
damages or injury incurred due to failure in fol-

lowing these instructions.

3. Installation MUST comply with the National Elec-
trical 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 specically authorized in writing
by Dometic Corporation.

5. This equipment MUST be serviced by qualied
personnel and some states require these people

to be licensed.

B. Choosing Proper Location For The Unit

This unit is specically 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. Normal locations-The unit is designed to t over
an existing roof vent opening.

2. Other locations-When no roof vent is available or
another location is desired, the following is rec­ommended:

a. For one unit installation: The unit should be

mounted slightly forward of center (front to
back) and centered from side to side.

b. 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 with the RV parked on a level sur-

face 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.

9-1/2"

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 require-

ment.

PROPERTY DAMAGE HAZARD. 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. Failure to obey this warn­ing may cause water damage to the product
and the RV.

c. Check inside the RV for air distribution box

obstructions. (i.e. door openings, room divid­ers, curtains, ceiling xtures, etc.) See FIG. 2.

FIG. 2

View From Above

4-15/16"

5-1/8"

Air Distribution Box

25"

20"

Dimensions Are Nominal

3"

9-3/16"

Air

5-29/64"

Duct

2-15/16"

Front

2-3/4"
(overall
depth)

Front

6"

3"

14-1/4" x 14-1/4" (±1/8") Opening

Dimensions Are Nominal

4

C. Roof Preparation

1. Opening requirements - Before preparing the
ceiling opening, read all of the following instruc-

tions before beginning the installation.

If an existing roof vent opening will not be used

a 14-1/4" x 14-1/4" (±1/8") opening must be cut

through the roof and ceiling of the RV. This open-

ing must be located between the roof reinforcing
members.

SHOCK HAZARD. There may be electrical wir­ing between the roof and the ceiling. Discon­nect 120 VAC power supply and the positive
(+) 12 VDC terminal at the supply battery.
Failure to obey this warning may cause death
or severe personal injury.

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.

2. Roof Vent Removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around open-

ing.

c. Seal all screw holes and seams where the

roof gasket will be located. Use a good grade

of all weather sealant.

d. If the opening exceeds 14-3/8" x 14-3/8", it

will be necessary to re-size the opening to

14-1/4" x 14-1/4" (±1/8").

e. If the opening is less than 14-1/8" x 14-1/8", it

must be enlarged to 14-1/4" x 14-1/4" (±1/8".

3. New Opening-(Installations Other Then Vent
Openings)
a. Mark a 14-1/4" x 14-1/4" (±1/8") square on

the roof and carefully cut the opening.

b. Using the roof opening as a guide, cut the

matching hole in the ceiling. See FIG. 3.

c. The opening created must be framed to pro-

vide 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 at the front of the opening.
See FIG. 3.

FIG. 3

Do Not Cut Roof
Structure Or
Rafters

3/4" Min.

Leave Access For Power
Supply Wiring

Good-Rafters
Supported By
Cross Beams

Good Location­Between Roof
Rafters

Frame Opening So It
Won't Collapse When
Bolting Down Unit

15" Min. At
Front Of
Opening

PROPERTY DAMAGE HAZARD. 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. Failure to obey this warning may cause
water damage to the product and the RV.

5

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. The proper size wire can
be determined from chart on page 3.

Note: If vent fan was removed, the existing wire may be
used provided it is of proper size, location, and correctly

fused.

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 at least 15" of wire extends into

the roof opening. This will insure easy con­nection to junction box.

d. Wiring MUST comply with the National Elec-

trical Code ANSI/NFPA-70 and CSA Stan-

dard 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 para-

graph "d" above.

FIG. 4

FRONT

4. Place the air distribution box 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

F. 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. 5.

FIG. 5

Center Unit From Below

E. 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 obey 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. 4.

PROPERTY DAMAGE HAZARD. Do not slide
the unit. Failure to obey this warning may
damage the neoprene gasket attached to the
bottom and create a leaky installation.

Roof Gasket

2. Remove air distribution box and mounting hard­ware from the air distribution box kit carton.

3. Remove wire tie holding center of rear aluminum

bracket to plastic template.

4. Reach up into return air opening of the unit and
pull the unit electrical cord down for later connec­tion. See FIG. 6.

FIG. 6

Reach Up Into The Return Air Opening
And Pull Down The Unit Electrical Cord

6

5. Base Pan Duct Adapter.
a. Remove the liner from the foam tape and posi-

tion on the base so screw hole and air openings

are aligned. See FIG. 7.

FIG. 7

Discharge
Opening Place
Flange Of Duct
On RH Side When
Facing Front

Front

Return Air
Opening

FIG. 8

Snap Cover
In Place Af­ter Wires Are
Connected

Install Screw

7. Ceiling template installation.

Base Pan
Duct Adapter

Screw

b. Install provided screw to help hold duct

adapter to base pan if desired.

6. 120 VAC Power Supply Connection

SHOCK HAZARD. Disconnect 120 VAC. Fail­ure to obey this warning could result in death
or serious 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.

a. Install the strain relief in the junction box.
b. Route the previously run 120 VAC power

supply wire through the strain relief and into
the junction box. Tighten connector making

sure not to damage wires.

Note: Connect wiring per schematic with UL listed wire

connectors for size of wire being connected.

Note: The large center hole in the ceiling template goes

to the rear. Insure that the thermostat bulb is not moved

during installation.

a. Plug the six pin cord into the control box on

the ceiling template. See Fig. 9.

FIG. 9

6 Pin Connector

b. Start each mounting bolt by hand before

tightening any of them. The threaded inserts
in the base pan can be seen to aid in starting
the bolts.

i. This installation uses a 3 bolt pattern,

one in the rear center and two in the front
corners. See Fig. 10.

Control Box

SHOCK HAZARD. This product is equipped
with a 3 wire (grounded) system for protection
against shock hazard. Make sure that the unit
is wired 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.

c. Connect white to white; black to black; and

green to green or bare copper wire using ap-

propriate size connectors.

d. Tape the connectors to the supply wire to as-

sure they don’t vibrate off.
e. Push the wires into the box.
f. Insert back edge of cover under tabs and snap

control box cover into place. Secure cover with

screw provided. See FIG. 8.

7

FIG. 10

Ceiling
Template

Trim Duct 1/2" to
1 " Below Ceiling
Template

Mounting Bolt

Front

Do Not Disturb
Thermostat Bulb

Mounting
Bolt

Start 3 Mounting
Bolts By Hand

• Evenly tighten the bolts to a torque

of 40 to 50 inch pounds. This will
compress the roof gasket to ap­proximately 1/2". The bolts are self
locking so further tightening is not
necessary. See FIG. 10.

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 specications listed in this

manual.

8. Template/Duct connector
a. Pull duct down through template opening.

b. Cut the duct 1/2"-1" below template opening.

See Fig. 10.
c. Align the template duct adapter with the tem-

plate duct hole making sure the screw holes

line up (if not rotate 1/2 turn). Insert template

duct adapter into duct. Leave one loop of

duct wire below the duct adapter groove. Do

not insert tabs inside of the duct.

d. Snap duct adapter into template and install 2

screws through the duct adapter tabs into the

ceiling template. See Fig. 11.

G. Air Distribution Box Installation

Important: The inner walls of the ADB go inside the
walls of the ceiling template during installation.

1. Working from the rear looking forward with the

rear tipped down, place the air distribution box in­ner walls against the inside of the ceiling template

walls. Slide the air distribution box backwards un­til it touches the template. Raise the air distribu­tion box to the ceiling. See FIG. 12 & 13.

FIG. 12

Position
ADB Walls
Inside And
Against End
Of Template
Walls

Raise Back
End Of ADB
To Ceiling

FIG. 11

Install 2 Screws In Tabs

Fit Duct
Adapter
Inside Duct

Duct Adapter
Screw Holes
Must Line Up
If Necessary
Rotate 1/2 Turn

Push Here To Engage
Latches, Then Remove Labels

2. Push up on the ADB at the locations indicated by
the paper labels to engage the snap locks. There
will be a quiet click heard when each latch en-

gages. See FIG. 12.

3. Hold the air distribution box to the ceiling with one

hand and install two coarse threaded 3.5 mm X 19
mm sharp pointed screws in the location shown in
FIG. 12.

4. Auxiliary screws may be installed at the locations

shown. These are NOT required to secure the ADB

to the template, but may be desired for aesthetic

purposes in some ceiling geometries. See FIG. 13.

8

FIG. 13

5. Filter installation. Slide lters into slots in air dis-

6. Knob installation. Install the two knobs provided

7. The power supply to the unit may now be turned

8. Your unit is now installed and ready for operation.

Auxiliary Screw Locations

Auxiliary Screw
Locations

tribution box. The outward curved side of the lter

handle faces the ceiling. See FIG. 13.

on the ends of the thermostat and selector switch

shafts. Align slot in knob with alignment post on

shaft and push into position.

"ON".

Read the following operating instructions before

attempting to run the unit.

Install 2 Primary
Mount Screw First

OPERATING INSTRUCTIONS

A. 3310741 Air Distribution Box With Me-

chanical Controls

1. Selector Switch & Thermostat
a. Model 3310741 ADB has a ve position Se-

lector Switch including "OFF". This controls
fan speed and cooling modes. See FIG. 14.

b. The thermostat controls the compressor ON/

OFF operation for a temperature range from

approx. 65° F. to 90° F. at the ADB inlet, de­pending on the knob position. See Fig. 14.

Important: When the unit is turned on and the ther-

mostat calls for cooling, the compressor will start. After
shutting the unit down manually by either the selec­tor switch or the thermostat, always wait 2-3 minutes
before turning on the unit. This allows the refrigerant
pressures in the unit system to equalize so the com­pressor may restart.

FIG. 14

Gray Graphic

Blue Graphic

2. Cooling Operation (Blue Graphic)
a. Set the thermostat at the desired tempera-

ture level. See FIG. 14.

b. Select the cooling mode that best satises

your needs:

• HIGH COOL: Selected when maximum

cooling and dehumidication required.

• LOW COOL: Select to maintain room at

desired comfort level. Normally this speed

used for night time operation.

Colder

Note: The compressor will come on as cooling is required

to maintain the selected temperature level. The blower
runs continuously.

3. Fan Operation (Gray Graphic)
a. This will circulate the air in your RV without

cooling. There are two positions: HIGH FAN
or LOW FAN to select from, depending upon
personal choice.

4. "OFF" Position
a. This is to turn unit off.

9

MAINTENANCE

A. Air Filter

1. Periodically (a minimum of every 2 weeks of op­eration) slide out the return air lters located on
the end of the air distribution box. Wash the lters
with soap and warm water, let dry and then rein-

stall.

Note: To insure easy future removal the lters need to be

replaced with the domed side of their handle positioned
towards the ceiling.

Note: Never run the unit without both return air lters in

place. This will plug the unit evaporator coil with dirt and

may substantially degrade the performance of the unit

over time.

B. Air Distribution Box Housing

1. Clean air distribution box housing with a soft cloth

dampened with a mild detergent. Never use furni­ture polish or scouring powders.

C. Fan Motor

1. The blower motor is factory lubricated and re­quires no service.

SERVICE-UNIT DOES NOT OPERATE

If your unit fails to operate or operates improperly, check
the following before calling your service center.

A. If RV connected to motor generator, check to be sure

motor generator is running and producing power.

B. If RV connected to power supply by a land line, check

to be sure line is sized properly to run unit load and it
is plugged into power supply.

C. Check your fuse or circuit breaker to see if it is open.

Insure fuse is not burnt, or circuit breaker is "ON"

and not activated.

D. After the above checks, call your local service center

for further help. This unit must be serviced by quali­ed service personnel only.

E. When calling for service, always give the following:

1. Unit model and serial number found on identication
label located on base pan of unit bottom. (Remove
lter and view through network of holes)

2. Air distribution box model and serial number found
on rating plate located on ceiling template. Observe
this rating plate through the air distribution box right

side vent opening.

D. Frost Formation On Cooling Coil

1. Frost on a small portion of the coil is not unusual.

Under certain conditions, ice may form on the
evaporator coil. This is indicated by very cold out­put at very low air speed and the icing can be
seen through the hole network with the lters re­moved. If this should occur, inspect the lter and
clean if dirty. Make sure air vents are open and
not obstructed. Units have a greater tendency to
frost when the outside temperature is relatively
low. This may be prevented by adjusting the ther­mostat control knob to a warmer setting (counter

clockwise). Should frosting continue, operate on
any fan ONLY setting until the cooling coil is free
of frost; then resume normal operation. If frost
condition persist, contact your local service cen­ter for assistance.

10

WIRING DIAGRAMS

WHT

3313033.000

YEL

CONDUCTORS

BLU/BLK

B

ONLY

FIELD WIRING
FACTORY WIRING

SWITCH

ROTARY

RED

BLK/ORG

GRN/YEL

L

2

1

1

2

3

4

5

6

CONNECTOR FROM

ROOF UNIT

H,6

C,4

L,3

THERMOSTAT

BLU

3

4

A

115V~
60 HZ 1
USE COPPER

GRN/

BLK

Unit Diagram

Air Distribution Box Wiring Diagram

11