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COPYRIGHT © 2006-2018 Dometic Corporation. All Rights Reserved.
No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted in any form or by any means
electronic, mechanical, photocopying, recording or otherwise without prior written consent by Dometic Corporation. Every precaution
has been taken in the preparation of this manual to ensure its accuracy. However, Dometic assumes no responsibility for errors and
omission. Neither is any liability assumed for damages resulting from the use of this product and information contained herein.
KRA Refrigeration Systems
(with R-404A refrigerant)
Installation, Operation & Maintenance Manual
KRA 433X
Air-and-Water-Cooled
KRA 450X
Air-and-Water-Cooled
Dometic Marine
Rev. 20180906
L-3571 English
P/N: 340161
KRA 433X
Water-Cooled-Only
L-3571 ENGLISH
Table of Contents
SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 3
R
EAD THIS MANUAL BEFORE PROCEEDING . . . . . . . . . . . 3
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS . . . . 3
S
AFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
S
AFE HANDLING OF REFRIGERANTS . . . . . . . . . . . . . . . . . 3
DRAWINGS AND DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . 4
REFRIGERATION BASICS . . . . . . . . . . . . . . . . . . . . . . . . . 4
SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 4
C
ONDENSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
E
VAPORATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
S
UCTION LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
L
IQUID LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
R
EFRIGERANT METERING DEVICE . . . . . . . . . . . . . . . . . . 5
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
S
EAWATER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
R
EFRIGERATOR/FREEZER BOXES . . . . . . . . . . . . . . . . . . 6
SYSTEM INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 6
U
NPACKING AND INSPECTION . . . . . . . . . . . . . . . . . . . . . 6
I
MPORTANT SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . 6
Electrical Shock Hazard . . . . . . . . . . . . . . . . . . . . . 6
T
OOLS REQUIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
I
NSTALLING THE REFRIGERATION SYSTEM . . . . . . . . . . . . 7
Condensing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TXV Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Quick-Connect Fittings . . . . . . . . . . . . . . . . . . . . . 8
Sight Glass/Moisture Indicator . . . . . . . . . . . . . . . . 9
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . 9
REFRIGERATION SYSTEM OPERATION . . . . . . . . . . . . . 9
KRA R
EFRIGERATION START-UP CHECK LIST . . . . . . . . . 9
Before You Start The System . . . . . . . . . . . . . . . . 9
Starting The System . . . . . . . . . . . . . . . . . . . . . . 10
System With 2 or 3 Evaporators
and 1 Condensing Unit . . . . . . . . . . . . . . . . . . . . 10
T
HERMOSTAT OPERATION . . . . . . . . . . . . . . . . . . . . . . . 10
Operating the Dometic Control . . . . . . . . . . . . . . 10
Parameter Programming . . . . . . . . . . . . . . . . . . . 11
Modbus Addresses for Dometic STIIC Interface . 12
SERVICING YOUR REFRIGERATION SYSTEM . . . . . . . 12
R
EFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
QUICK-CONNECT FITTINGS . . . . . . . . . . . . . . . . . . . . . . 12
R
ECHARGING THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . 12
System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . 12
Evacuate Refrigerant . . . . . . . . . . . . . . . . . . . . . 12
Charging the System . . . . . . . . . . . . . . . . . . . . . 12
A
DJUSTING THE TXV . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TXV METERING DEVICE . . . . . . . . . . . . . . . . . . . . . . . . 13
S
IGHT GLASS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
USER MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
S
EAWATER SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
D
EFROSTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
WINTERIZING THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . 13
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . 14
FIGURES & WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . 16
KRA C
ABINET-TYPE CONDENSING UNITS . . . . . . . . . . . 16
V
ARIOUS FLAT-PLATE EVAPORATORS . . . . . . . . . . . . . . 16
W
RAPPED-BOX EVAPORATOR . . . . . . . . . . . . . . . . . . . . 16
FLAT-PLATE EVAPORATOR DESIGNS . . . . . . . . . . . . . . . 16
D
IGITAL THERMOSTAT (DOMETIC CONTROL) . . . . . . . . . 16
S
INGLE-PLATE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . 17
DUAL-PLATE SYSTEM WITH JUMPER . . . . . . . . . . . . . . . 18
I
NSTALLATION DIAGRAM - 2 FISH BOXES WITH KRA 433X .
19
INSTALLATION DIAGRAM - 3 FISH BOXES WITH KRA 450X .
20
R
EFRIGERANT PRESSURE-TEMPERATURE CHART . . . . . 21
WIRING DIAGRAM FOR KRA 433X UNIT WITH 1 BOX . . . 22
W
IRING DIAGRAM FOR KRA 433X UNIT WITH 2 BOXES . 23
W
IRING DIAGRAM FOR KRA 450X UNIT WITH 1 BOX . . . 24
W
IRING DIAGRAM FOR KRA 450X UNIT WITH 3 BOXES . 25
KRA Refrigeration System Installation, Operation & Maintenance Manual
L-3571 ENGLISH 3
SAFETY INSTRUCTIONS
READ THIS MANUAL BEFORE PROCEEDING
This manual contains essential information to ensure proper installation, operation and maintenance of your KRA refrigeration
system. Improper installation or misunderstood operating procedures can result in unsatisfactory performance and/or premature
failure of these units, so please read this manual completely before proceeding.
It is very important that you read and understand the contents of this manual before using the equipment, and it should be kept
on the boat for future reference. If you have questions or require assistance with your KRA refrigeration system, call your
authorized dealer or the Dometic Marine Service Department at +1 954-973-2477.
RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS
The following symbols and labels are used throughout this manual to indicate immediate or potential safety hazards. it is the
owner’s and installer’s responsibility to read and comply with all safety information and instructions accompanying these
symbols. Failure to heed safety information increases the risk of personal injury, property damage, and/or product damage.
SAFETY GUIDELINES
1. Allow only qualified, experienced technicians to install or service this system.
2. Install the system in accordance with all local codes. If no local codes exist, follow National Codes (NEC in the U.S.,
CEC in Canada).
3. Open the electrical disconnect switch(es) before electrically connecting the unit.
4. Before operating the unit, be certain it is properly grounded.
5. The units contain refrigerant gas under pressure. Avoid puncturing or breaking any tubing.
6. Before operating the system, complete the refrigerant connections.
SAFE HANDLING OF REFRIGERANTS
Your refrigeration system uses the refrigerant gas R-404A. Federal law forbids the intentional release of the refrigerant gas to
the environment. You should make certain that any field service is performed by a specialist with the proper equipment to
prevent any loss of R-404A during servicing.
The following warnings can not cover every conceivable situation, but they should serve as a useful guide.
WARNING
The word “WARNING” indicates hazards or unsafe practices which COULD result in severe personal injury or death.
CAUTION
The word “CAUTION” indicates hazards or unsafe practices which COULD result in minor or moderate personal injury,
product damage, or property damage.
WARNING
To avoid personal injury, shock, or death, ensure the electrical disconnect switch(es) is (are) in the OFF position
before installing, modifying, or servicing the unit. Lock out and tag the switch with a suitable warning label. Wiring
must conform with NEC or CEC and all local codes.
NOTICE
Contains R-404A fluorinated greenhouse gas in sealed equipment. Refer to the condensing unit's product data plate
label for quantity of refrigerant shown in weight, global warming potential (GWP), and equivalent tonnes of CO2
(tCO2e). Any refrigerant added should be noted on unit label.
Produktspecifikationer
| Varumärke: | Dometic |
| Kategori: | kylskåp |
| Modell: | KRA 433X |
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