Dometic 57912.531, 57915.336, 57908.521, 57915.331, 57912.532 Installation Instructions Manual

RECORD THIS INFORMATION FOR FUTURE
REFERENCE:

Model Number
Serial Number
ADB Model Number
ADB Serial Number
Date Purchased

Roof Top Unit Used With 3105007.XXX or 3105935.XXX Air Distribution Box

Description Model Electronic Control Kit Thermostat Optional Indoor

Air Conditioner

LCD SZ Controls 57908

59712
57915
59516

59530
520300
520310
520315
520316
600312
600315

3316155.000 Thermostat Included With
Electronic Control Kit

Temperature

Sensor

N/A

INSTALLATION

INSTRUCTIONS

REVISION C

Form No. 3316570.000 6/18
French (3316571.000_C)
©2018 Dometic Corporation
LaGrange, IN 46761

This Unit is designed for OEM installation.

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

USA

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

SERVICE CENTER &
DEALER LOCATIONS
Please Visit:

www.eDometic.com

INTRODUCTION

This air conditioner/heat pump (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.

Read these instructions and highlight the appropriate steps for your particular procedure before starting the installation.

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.

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 .............................................................................................................5

INSTALLATION INSTRUCTIONS .......................................................................................................................................5

A. Choosing Proper Location For Unit ...........................................................................................................................5

B. Roof Preparation .......................................................................................................................................................6

C. Air Distribution Duct Sizing & Design ........................................................................................................................7

D. Wiring Requirements .................................................................................................................................................8

E. Choosing Thermostat Location ..................................................................................................................................8

F. Thermostat Installation .............................................................................................................................................9

G. Placing Unit On Roof ................................................................................................................................................. 9

H. Installation Preparation ............................................................................................................................................ 10

I. LCD SZ System Low Voltage Wire Connections .....................................................................................................12

J. Upgrading from Bi-Metal Thermostat to SZ LCD Thermostat .................................................................................12

K. Installing Return Air Cover .......................................................................................................................................13

GENERAL INFORMATION ................................................................................................................................................14

A. Frost Formation On Cooling Coil ............................................................................................................................. 14

B. Heat Gain ................................................................................................................................................................14

C. Condensation ..........................................................................................................................................................14

D. Air Distribution ......................................................................................................................................................... 14

WIRING DIAGRAMS ..........................................................................................................................................................15

A. Simple RV Wiring Diagram ......................................................................................................................................15

B. Unit Wiring Diagrams ............................................................................................................................................... 16

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
users 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.

Incorrect [installation / operation / servicing /
maintaining] of this product can lead to seri­ous injury. Follow all instructions.

The installation MUST comply with all ap­plicable local or 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

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.

3

SPECIFICATIONS

A. Table - Unit Data

Model No. Nominal

57908.321 7,180 120 VAC

57908.521 7,100 6.6 34.0 2.5 5.8 17.0 20 Amp 2.5 kW / 4.0 kW

57912.531 11,000 8.0 53.0 2.5 5.8 18.5 20 Amp 2.5 kW / 4.0 kW

57912.532 11,000 12.1 59.0 2.5 5.8 16.5 20 Amp 3.5 kW / 5.0 kW

57915.331 13,500 11.4 58.0 2.5 5.8 15.5 20 Amp 3.5 kW / 5.0 kW

57915.336 13,500 12.1 59.0 2.5 5.8 16.5 20 Amp 3.5 kW / 5.0 kW

57915.531 13,500 12.1 59.0 2.5 5.8 16.5 20 Amp 3.5 kW / 5.0 kW

57915.536 13,500 12.1 59.0 2.5 5.8 16.5 20 Amp 3.5 kW / 5.0 kW

57915.541 13,500 11.3 62.0 2.5 5.8 16.0 20 Amp 3.5 kW / 5.0 kW

57915.546 13,500 11.3 62.0 2.5 5.8 16.0 20 Amp 3.5 kW / 5.0 kW

57915.741 13,500 12.0 58.0 2.5 5.8 15.5 20 Amp 3.5 kW / 5.0 kW

57915.746 13,500 12.0 58.0 2.5 5.8 15.5 20 Amp 3.5 kW / 5.0 kW

59516.331 15,000 11.5 50.0 2.5 5.8 29.0 20 Amp 3.5 kW / 5.0 kW

59516.336 15,000 12.7 60.0 2.0 5.6 29.0 20 Amp 3.5 kW / 5.0 kW

59516.531 15,000 11.5 50.0 2.5 5.8 26.5 20 Amp 3.5 kW / 5.0 kW

59516.536 15,000 11.5 50.0 2.5 5.8 29.0 20 Amp 3.5 kW / 5.0 kW

59516.731 15,000 13.3 62.0 2.0 5.6 29.0 20 Amp 3.5 kW / 5.0 kW

59530.532 N/A 8.0 53.0 2.5 5.8 18.5 15 Amp 3.5 kW / 5.0 kW

59530.536 N/A 7.8 53.0 2.0 5.6 19.0 15 Amp 3.5 kW / 5.0 kW

520310.501 9,000 7.8 49.0 3.0 8.5 20.0 20 Amp 2.5 kW / 4.0 kW

520315.501 13,500 10.3 62.0 3.0 8.5 16.5 20 Amp 3.5 kW / 5.0 kW

520315.506 13,500 10.3 62.0 3.0 8.5 16.5 20 Amp 3.5 kW / 5.0 kW

520316.501 15,000 13.2 79.0 2.8 7.6 30.0 20 Amp 3.5 kW / 5.0 kW

520316.506 15,000 13.2 79.0 2.8 7.6 30.0 20 Amp 3.5 kW / 5.0 kW

520300.501 N/A 7.8 49.0 3.0 8.5 20.0 15 Amp 2.5 kW / 4.0 kW

600312.331 11,000 9.5 53.0 3.5 10.0 17.0 20 Amp 2.5 kW / 4.0 kW

600315.331 13,500 12.4 60.0 3.5 10.0 15.2 20 Amp 3.5 kW / 5.0 kW

600315.336 13,500 12.4 60.0 3.5 10.0 15.2 20 Amp 3.5 kW / 5.0 kW

Capacity

(BTU HR)

Cooling

Electrical

Rating

60Hz. 1PH

Compressor

Rated Load

Amps

6.9 36.0 2.5 5.8 16.0 20 Amp 2.5 kW / 4.0 kW

Compressor

Locked

Rotor
Amps

Fan Motor

Rated Load

Amps

Fan Motor

Locked

Rotor
Amps

Refrigerant

R-410A

(Oz.)

Minimum

Wire Size*

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 2 inches and maximum of 5-1/2 inches distance between roof to ceiling of RV.

4

SPECIFICATIONS

C. Table - Air Distribution Duct Sizing & Design

Air Distribution Duct Sizing & Design Chart

For Ducted Applications

Return Air Cover Model 3105007.XXX

Roof Cavity Depth 2 in - 2 1/2 in Max.

Duct Cross Section Area (inside) 21 in2 Min.

Duct Size
Depth
Width
Total Duct Length
Duct Length (short run)

Register Requirements per A/C Unit
Number Required
Free Air Area Per Register
Distance From Duct End
Distance From Elbow

Total System Static Air Pressure
Blower At High Speed, Filter &

Grill In Place

Note: Duct sizes listed are inside dimensions

3105935.XXX

1 1/2 in Min. - 2 1/2 in Max.
7 in Min. - 10 in Max.
15 ft Min. - 40 ft Max.
1/3 Min. Of Total Duct Length

4 Min. - 8 Max.
14 in2 Min.
5 in Min. - 8 in Max.
15 in

0.12 - 0.65 in W.C.

INSTALLATION INSTRUCTIONS

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

57908
57912
57915
59516
59530

520300

Max

Tilt

15° 520310

Model

Number

520315
520316

600312
600316

Max

Tilt

15°

8°

FIG. 1

a. Check for obstructions in the area where

unit will be installed. See (FIG. 1), (FIG. 2)
& (FIG. 3).

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
requirement.

13-1/8″

Dimensions Are Nominal

34-7/8″

18″

Center Line Of Unit

29-7/8″

Model
57908
57912
57915
57916
59530

Roof Opening

Front

3. After Location Has Been Selected:

Keep This Area Free Of Obstructions

5