Description
Air Conditioner 457915
Model Use With Air Distribution Box
B57915
459516
B59516
540315
H540315
540316
H540316
640312
640315
640316
RECORD THIS INFORMATION FOR FUTURE
REFERENCE:
Model Number
Serial Number
ADB Model Number
ADB Serial Number
Date Purchased
Roof Top Unit
Model Control
3314851.000 Integral Mechanical
INSTRUCTIONS
INSTALLATION & OPERATING
REVISION E
Form No. 3315079.016 6/18
(French 3315288.013_E)
©2018 Dometic Corporation
LaGrange, IN 46761
Read these instructions carefully. These
instructions MUST stay with this product.
USA & CANADA
SERVICE OFFICE
Dometic Corporation
1120 North Main Street
Elkhart, IN, 46514
SERVICE CENTER &
DEALER LOCATIONS
Please Visit:
www.dometic.com
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 or after 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 specications without notice.
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
INSTALLATION INSTRUCTIONS .......................................................................................................................................4
A. Choosing Proper Location For Unit ...........................................................................................................................4
B. Roof Preparation .......................................................................................................................................................6
C. Wiring Requirements .................................................................................................................................................7
D. Placing Unit On Roof .................................................................................................................................................7
E. Installation Preparation .............................................................................................................................................. 8
F. Duct Divider Installation ............................................................................................................................................. 8
G. Installing Unit ............................................................................................................................................................. 9
H. 120 Vac Power Supply Connection .........................................................................................................................10
I. Installing ADB ..........................................................................................................................................................10
OPERATING INSTRUCTIONS ..........................................................................................................................................12
A. Controls ...................................................................................................................................................................12
B. “OFF” Position ( ) ..................................................................................................................................................12
C. Cooling Operation (Blue Graphic) ........................................................................................................................... 12
D. Heating Operation (With Electric Heater Option Installed). ..................................................................................... 12
E. Fan Operation (Black Graphic) ................................................................................................................................ 12
F. Center Air Discharge ...............................................................................................................................................12
MAINTENANCE ..................................................................................................................................................................13
A. Air Filter ...................................................................................................................................................................13
B. ADB Housing ........................................................................................................................................................... 13
C. Fan Motor ................................................................................................................................................................ 13
GENERAL INFORMATION ................................................................................................................................................13
A. Frost Formation On Cooling Coil ............................................................................................................................. 13
B. Heat Gain ................................................................................................................................................................13
C. Condensation ..........................................................................................................................................................13
D. Air Distribution ......................................................................................................................................................... 13
SERVICE - UNIT DOES NOT OPERATE .........................................................................................................................14
WIRING DIAGRAMS ..........................................................................................................................................................14
A. Unit Wiring Diagrams ............................................................................................................................................... 14
B. ADB Wiring Diagram ...............................................................................................................................................15
DOCUMENT SYMBOLS
Indicates additional information that is NOT related
to physical injury.
Indicates step-by-step instructions.
2
IMPORTANT SAFETY INSTRUCTIONS
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 injury.
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 before [installing / using / servicing / performing
maintenance on] this product.
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 warnings could result in death or serious injury:
● This product MUST be [installed / serviced] by a
qualied service technician.
● Do NOT modify this product in any way. Modica-
tion can be extremely hazardous.
● Do NOT add any devices or accessories to this
product except those specically authorized in
writing by Dometic Corporation.
Incorrect [installation / operation / servicing /
maintaining] of this product can lead to serious injury. Follow all instructions.
3
SPECIFICATIONS
A. Table - Unit Data
Model No. Nominal
457915.70X 13,500 12.4 63.0 2.5 5.8 18.0 20 Amp 3.5 kW / 5.0 kW
457915.71X 13,500 12.4 68.0 2.5 5.8 18.0 20 Amp 3.5 kW / 5.0 kW
B57915.71X 13,500 12.4 68.0 2.5 5.8 18.0 20 Amp 3.5 kW / 5.0 kW
459516.70X 15,000 13.3 66.0 2.0 5.6 27.5 20 Amp 3.5 kW / 5.0 kW
459516.71X 15,000 13.3 70.0 2.0 5.6 27.5 20 Amp 3.5 kW / 5.0 kW
B59516.71X 15,000 13.3 70.0 2.0 5.6 18.3 20 Amp 3.5 kW / 5.0 kW
540315.70X 13,500 12.4 63.0 3.0 8.5 18.5 20 Amp 3.5 kW / 5.0 kW
540315.71X 13,500 12.4 68.0 3.0 8.5 18.5 20 Amp 3.5 kW / 5.0 kW
H540315.72X 13,500 12.7 68.0 2.8 8.0 19.5 20 Amp 3.5 kW / 5.0 kW
540316.70X 15,000 13.3 66.0 2.8 7.6 29.5 20 Amp 3.5 kW / 5.0 kW
540316.71X 15,000 13.3 70.0 2.8 7.6 29.5 20 Amp 3.5 kW / 5.0 kW
H540316.72X 15,000 13.2 70.0 2.8 8.0 20.1 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
640312C35X 11,000 10.5 53.0 3.5 10.0 19.0 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
640315.80X 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
640315C35X 13,500 12.5 61.0 3.5 10.0 17.5 20 Amp 3.5 kW / 5.0 kW
640315C75X 13,500 12.7 52 2.6 8.5 14.5 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
640316C75X 15,000 12.9 52 2.6 8.5 21.5 20 Amp 3.5 kW / 5.0 kW
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
* 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 1.5 inches and maximum of 6 inches distance between roof to ceiling of RV.
INSTALLATION INSTRUCTIONS
A. Choosing Proper Location For Unit
This unit is specically 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. Normal locations-The unit is designed to t over
an existing roof vent opening.
4
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 measured with the RV parked on a
level surface. See table for maximum acceptable tilt.
INSTALLATION INSTRUCTIONS
Model
Number
457915
B57915
459516
B59516
540315
Max Tilt
(All Directions)
15° H540315
Model
Number
540316
H540316
640312
640315
640316
After Location Has Been Selected:
c. Check for obstructions in the area where
unit will be installed. See (FIG. 1), (FIG. 2),
(FIG. 3), (FIG. 4), (FIG. 5) & (FIG. 6).
FIG. 1
13-1/8″
Dimensions Are Nominal
34-7/8″
18″
Center Line Of Unit
Max Tilt
(All Directions)
15°
8°
Model
457915
459516
29-7/8″
Roof Opening
FIG. 3
13″
18″
FIG. 4
Dimensions Are Nominal
39-5/8″
Roof Opening
Center Line Of Unit
Keep This Air Flow Area Free Of Obstructions
Dimensions Are Nominal
Model
540315
540316
29-7/8″
Front
640312
640315
Model
FIG. 2
12-7/8″
Front
Keep This Air Flow Area Free Of Obstructions
Dimensions Are Nominal
27-5/8″
18″
29-5/8″
Center Line Of Unit
Roof Opening
Front
Model
B57915
B59516
Keep These
Air Flow
Areas
Free Of
Obstructions
12″
Center Line Of Unit
4″
40″
4″
9-1/2″
29″
Front
Roof Opening
Keep This Air Flow Area Free Of Obstructions
5
INSTALLATION INSTRUCTIONS
FIG. 5
Keep These
Air Flow
Areas
Free Of
Obstructions
FIG. 6
Dimensions Are Nominal
40-1/2″
12″
Center Line Of Unit
4″
Dimensions Are Nominal
4″
29″
Model
640312C
640315C
640316C
10-3/8″
Roof
Opening
Front
Model
H540315
H540316
FIG. 7
2-5/8″
3-7/16″
Roof Opening
3-7/16″
6″
23-1/8″
Dimensions Are Nominal
11-9/16″
Faces
Front
21-1/8″
11-9/16″
21-1/8″
2-7/8″
13-7/8″
Keep These Air
Flow Areas Free
Of Obstructions
18″
d. 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
requirement.
e. Check inside the RV for air distribution box
(hereinafter referred to as “ADB”) obstructions (i.e. door openings, room dividers, cur-
tains, ceiling xtures, etc.). See (FIG. 7).
40″
4″
Center Line Of Unit
4″
30″
Roof Opening
Front
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, read all of the following instructions before beginning the
installation.
If an existing roof vent opening will NOT
be used a roof opening MUST be cut
through the roof and ceiling of the RV.
This opening MUST be located between
the roof reinforcing members.
2. Roof vent removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around
opening.
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 resize the opening. See
“B. Roof Requirements” on page (4).
6
INSTALLATION INSTRUCTIONS
e. If the opening is less than 14-1/8″ x 14-1/8″,
it must be enlarged. See “B. Roof Requirements” on page (4).
3. New opening
a. Carefully mark and cut the required roof
opening. See “B. Roof Requirements” on
page (4).
b. Maintain structural integrity.
Otherwise damage to product and/or RV
could occur.
NEVER create a low spot on
RV roof. Otherwise, water will pool and could
cause a leak.
Using the roof opening as a guide, cut the
matching hole in the ceiling.
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 at the front of the opening.
See (FIG. 8).
FIG. 8
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.
D. 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 the roof.
3. Do NOT slide unit. Otherwise,
damage to gasket (on bottom of unit) may occur,
and could cause a leak.
Lift and place the unit over the prepared opening using the gasket on the unit as a guide. See
(FIG. 9).
Do Not Cut Roof
Structure Or
Rafters
3/4″ Min.
Good-Rafters
Supported By
Cross Beams
Frame Opening So It
Won't Collapse When
Good Location
Between Roof
Rafters
Bolting Down Unit
Leave Access For
Power Supply Wiring
15″ Min. At
Front Of
Opening
C. 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/certied
non metallic - sheathed single strand cable. See
“A. Table - Unit Data” on page (4).
If vent fan was removed, the existing wire
may be used provided it is of proper type,
size, location, and correctly fused.
FIG. 9
Model
H540315
H540316
Shown
Unit May Vary In Appearance
Lift And Place
Front
Do Not Slide
4. Place the ADB 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.
7
INSTALLATION INSTRUCTIONS
E. Installation Preparation
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. 10).
FIG. 10
Model
H540315
H540316
Shown
2. Remove ADB and mounting hardware from car-
FIG. 11
Duct Divider
Control
Box
3. All models in this manual will use a four (4) bolt
4. Reach up into the return air opening of the unit
Center Unit From Below
Roof Gasket
Unit May Vary In Appearance
ton. See (FIG. 11).
Ceiling
Template
ADB
pattern for installing the ADB kit.
and pull the unit electrical cord down for later
connection. See (FIG. 12).
FIG. 12
Unit May Vary In Appearance
Electrical Cord
Measure Ceiling
Thickness
Model H540315 H540316 Shown
F. Duct Divider Installation
1. Measure the ceiling thickness. See (FIG. 12).
2. Cut away the number of rows as indicated in the
table below. See (FIG. 13).
H540315, H540316 457915, B57915
Ceiling
Thickness
Min. Max. Min. Max.
5.75 6.25 0 6.0 6.5
5.25 5.75 1 5.5 6.0
4.75 5.25 2 5.0 5.5
4.25 4.75 3 4.5 5.0
3.75 4.25 4 4.0 4.5
3.25 3.75 5 3.5 4.0
2.75 3.25 6 3.0 3.5
2.25 2.75 7 2.5 3.0
1.75 2.25 8 2.0 2.5
1.25 1.75 9 1.5 2.0
# Of
Rows
To Cut
FIG. 13
Remove Rows
Starting Here
459516, B59516
540315, 540316
640312, 640315,
640316
Ceiling
Thickness
3. Carefully install the duct divider in the roof
opening 5-5/8″ from back of roof opening. See
(FIG. 14).
Foil back faces rear of unit.
8
INSTALLATION INSTRUCTIONS
FIG. 14
Duct Divider
5-5/8″ From Back
Of Roof Opening
G. Installing Unit
1. Ceiling Template Installation
a. Plug the 6 pin electrical cord from the top unit
into the matching 6 pin connector in the electronic control box. The plug is polarized and
will only t in one direction. See (FIG. 15).
FIG. 15
Unit Electrical
Cord
Proper Orientation
Of Cable Connector
120 Vac
Power Supply
Front
Rear
Base Pan
Black Side
To Front
Cable
Connector
FIG. 16
FIG. 17
Duct Divider
Channel
Mounting Bolt Pattern Table See (FIG. 17)
Model Bolt Location
457915 A, D, E & H
B57915 A, D, E & H
459516 A, D, E & H
B59516 A, D, E & H
540315 B, C, F & G
H540315 A, D, E, & H
540316 B, C, F & G
H540316 A, D, E, & H
640312 B, C, F & G
640315 B, C, F & G
640316 B, C, F & G
A D
B
C
b. Install supplied non metallic cable connector
in junction box hole cutout. See (FIG. 15) for
proper orientation.
c. Route the previously run 120 Vac power sup-
ply wire through cable connector and into
junction box.
d. Secure 120 Vac power supply by tightening
cable connector clamp making sure not to
damage wires. See (FIG. 15).
e. Hold the ceiling template up to the roof open-
ing and line up the channel in the ceiling
template with the previously installed duct
divider. See (FIG. 16).
f. Hold the ceiling template up to the roof open-
ing and start each mounting bolt, by hand,
through the ceiling template and up into the
unit base pan. See (FIG. 17) & (FIG. 18).
E H
F
g. Tighten mounting bolts to
correct torque specications. Overtightening could damage unit’s base pan or ceiling
template. Not enough torque will allow an inadequate roof seal, and could cause a leak.
Tighten all four (4) mounting bolts EVENLY
within 40 to 50 inch pounds. See (FIG. 18).
9
G
INSTALLATION INSTRUCTIONS
FIG. 18
Mounting Bolt
Mounting Bolt
H. 120 Vac Power Supply Connection
1. ELECTRICAL SHOCK HAZARD.
Make sure 120 Vac power is disconnected from
RV. Failure to obey this warning could result in
death or serious injury.
2. ELECTRICAL SHOCK HAZARD.
Provide grounding in compliance with all applicable electrical codes. Failure to obey this warning could result in death or serious injury.
3. Connect white to white; black to black; using appropriate size connectors. Secure bare copper
wire under grounding screw in junction box. See
(FIG. 19).
FIG. 19
FIG. 20
FIG. 21
ADB Hole
Alignment
Front and rear vent doors are supplied
loose. Do NOT install them until all screws
are installed in step 2 & 3.
Ceiling Template
Alignment Holes
ADB Alignment Holes
Hole In Ceiling
Template
Junction Box
Cover Screw
4. Tape the connectors to the supply wire to ensure
they don’t vibrate loose.
5. Push the wires into the junction box and install
junction box cover. See (FIG. 19).
Junction
Box Cover
I. Installing ADB
1. Align ADB with ceiling template. See (FIG. 20)
& (FIG. 21).
Hole In
ADB Cover
10
INSTALLATION INSTRUCTIONS
2. Install two (2) (supplied) sheet metal screws inside return air opening to secure ADB to ceiling
template. See (FIG. 22).
3. Install eight (8) (supplied) wood screws inside
the front, rear and side doors to secure ADB to
ceiling. See (FIG. 22).
FIG. 22
2 Sheet
Metal Screws
6. Install return air vent grille into the ADB. Slide return air vent grille tab into slot in ADB and rotate
up and snap in place. See (FIG. 24).
FIG. 24
Slot In ADB
Return Air
Vent Grille
7. Install the control knobs into the ADB. See
(FIG. 25).
FIG. 25
8 Wood Screws
4. Install front and rear doors.
5. Place lter in return air vent grille. It may already
be installed on some units. See (FIG. 23).
FIG. 23
Filter
Return Air
Vent Grille
Knob
8. The unit installation is now complete and is
ready for operation. The power supply to the unit
may now be turned on.
9. Verify that all features of the installed system
work. Please read the following operating instructions before attempting to run the unit.
11
OPERATING INSTRUCTIONS
A. Controls
1. The Selector Switch has (8) positions including
“OFF”. This controls fan speeds, cooling modes
and optional heating modes of operation. See
(FIG. 26).
FIG. 26
Black
Graphic Fan
Blue Graphic
Cooling
2. The thermostat controls the compressor On/
OFF operation within a temperature range of
approximately 65° F and 90° F measured at the
ADB inlet.
Colder
D. Heating Operation (With Electric Heater
Option Installed).
The heat mode of operation will NOT replace
a furnace for heating your RV in cold weather. The intent is to remove the chill on cool
days or mornings.
1. Turn the selector switch to “OPT HEAT”.
2. The heat strip will come on and begin heating.
3. When desired temperature level in RV is
reached, move the selector switch to “OFF” position or “FAN” position.
Thermostat does NOT control the fan/heater
ON/OFF cycle.
E. Fan Operation (Black Graphic)
This will circulate the air in your RV without
cooling or heating.
1. Turn the selector switch to fan (black graphic).
There are three positions to select from (high,
medium and low). See (FIG. 26).
F. Center Air Discharge
1. Slide lever to open and close. See (FIG. 27).
B. “OFF” Position ( )
1. This is to turn unit o.
C. Cooling Operation (Blue Graphic)
1. Turn selector switch to cooling (blue graphic).
2. Set the thermostat at the desired temperature
level.
3. Select the fan speed that best satises your
needs:
a. HIGH COOL: Selected when maximum cool-
ing and dehumidication required.
b. MEDIUM COOL: Selected when normal or
average cooling required.
c. LOW COOL: Selected when room is at de-
sired comfort level and needs to be maintained. Normally this speed is used for night
time operation.
The compressor will cycle on and o as
cooling is required to maintain the selected temperature level. The fan runs when
the compressor is o to help keep the
temperature uniform throughout the RV.
Wait at least 2 minutes before restarting the compressor when it has been manu-
ally cycled o with either the selector switch or the
temperature set lever. Otherwise, compressor will
quick-cycle and could result in compressor or supply circuit overload.
FIG. 27
Slide To Open
Or Close
12
MAINTENANCE
A. Air Filter
1. Periodically (a minimum of every 2 weeks of operation) remove the return air lter located behind the return air vent grille and wash it with
soap and warm water, let dry and then reinstall.
NEVER run unit without return air lter
in place. This will plug the unit evaporator coil with dirt and may substantially
degrade the performance of the unit over
time.
GENERAL INFORMATION
A. Frost Formation On Cooling Coil
Frost on a small portion of the coil is not un usual. 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 air inlet hole with the lter
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
ad justing the thermostat control knob to a warmer setting
(counter clockwise). Should frosting con tinue, operate on
any FAN ONLY setting until the cooling coil is free of frost;
then resume nor mal operation. If frost condition persist,
contact your local service center for assistance.
B. Heat Gain
The ability of this air conditioner to maintain the desired
inside temperature depends on the heat gain of the RV.
B. ADB Housing
1. Clean ADB housing and control panel 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.
C. 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, depending 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.
D. Air Distribution
Each A/C unit operating in cool mode, must have a minimum of 2 distribution vents, or the quick cool vent and one
vent open, to avoid the risk of freezing coils and improper
function.
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 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 eciency 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.
13
SERVICE - UNIT DOES NOT OPERATE
If your unit fails to operate or operates improperly, check
the following before calling your service center.
● If RV connected to motor generator, check to
be sure motor generator is running and producing power.
● 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.
● Check your fuse or circuit breaker to see if it is
open. Ensure fuse is not burnt, or circuit breaker is “ON” and not activated.
● After the above checks, call your local service
center for further help. This unit must be ser-
viced by qualied service personnel only.
WIRING DIAGRAMS
A. Unit Wiring Diagrams
1. 457915, 459516, B57915 & B59516
When calling for service, always give the following:
● Unit model and serial number found on the
identication label located on base pan of unit
bottom. Return air vent grille must be removed
from ADB to view.
● ADB model and serial number found on rating
plate located on ceiling template. Observe this
rating plate through the lter opening.
3. 640312, 640312C, 640315, 640315C, 640316
2. 540315, 540316, H540315 & H540316
14
WIRING DIAGRAMS
*
B. ADB Wiring Diagram
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