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KRA Refrigeration Systems
(with R-404A refrigerant)
Installation, Operation & Maintenance Manual
KRA 433X
Water-Cooled-Only
Dometic Marine
Rev. 20180906
L-3571 English
P/N: 340161
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 433X
Air-and-Water-Cooled
KRA 450X
Air-and-Water-Cooled
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Summary of Contents for Dometic KRA Series
- Page 1 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.
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Page 2: Table Of Contents
PERATION Operating the Dometic Control ....10 Parameter Programming ....11 Modbus Addresses for Dometic STIIC Interface . -
Page 3: Safety Instructions
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. ECOGNIZE... -
Page 4: Drawings And Diagrams
WARNING To avoid possible explosion, death, or injury, practice safe handling of refrigerants. WARNING Refrigerants are heavier than air. They can “push out” the oxygen in your lungs or in any enclosed space. To avoid possible death or difficulty breathing: •... -
Page 5: Condensing Unit
When power availability is not constant, 4" (10 cm) of R7 insulation is required. It is best to use as much insulation as is practical. Call the Dometic Applications Department for advice on larger sized boxes, or if you are unsure. -
Page 6: Seawater System
OXES The Dometic Applications Department can assist in box design. Box design is very important to the proper operation of a system. A poorly designed and/or built refrigerator/freezer box will result in poor operation of the overall system. Care must be taken to address type of insulation, thickness of insulation, air circulation and drains. -
Page 7: Installing The Refrigeration
KRA Refrigeration System Installation, Operation & Maintenance Manual NSTALLING THE EFRIGERATION YSTEM ONDENSING Locate unit in a dry area where a constant source of circulated air is always available. Maximum air temperature for the system to operate at full capacity is: 100°F/38°C measured at the condensing unit. Temperatures above this will result in reduced capacity of the air condensing system and may cause compressor damage. -
Page 8: Evaporator
The box must be installed in such a way that it can be serviced or replaced without causing damage to it or to its associated refrigeration lines or other components. Dometic cannot be held liable for any damages caused by moving the box. -
Page 9: Sight Glass/Moisture Indicator
See Figure 10: Refrigerant Pressure-Temperature Chart, page 21. REFRIGERATION SYSTEM OPERATION This section of the manual refers to essential safe operation for all KRA refrigeration systems. For any operational problems call your authorized dealer or the Dometic Marine Service Department at +1 954-973-2477. KRA R EFRIGERATION... -
Page 10: Starting The System
ONTROL Powering On The System When the control is powered up (breaker on), the Dometic control display will light up showing all the icons and 888. That is followed by a display of r5.2 then - - -. After - - - displays, depending on the mode it was in when it was last powered OFF, the display could flash between... -
Page 11: Parameter Programming
DO NOT CHANGE THE PROGRAMMING UNLESS ABSOLUTELY NECESSARY. control, but ONLY those shown in the following table should ever be changed, and changes will rarely be needed. Table 3: Dometic Preset Control Parameter Descriptions for KRA 433X and 450X Units CODE... -
Page 12: Servicing Your Refrigeration System
NTERFACE To implement remote monitoring and control of the KRA system(s) via the Dometic Smart Touch Integrated Intelligence Control (STIIC), use the Modbus settings shown in the table below. There is a maximum of 3 controllers per KRA unit on STIIC. -
Page 13: Adjusting The Txv Metering Device
Follow directions with the valve. Replace the outer nut, and tighten to 3 ft-lbs. Insulate valve and bulb fully. TXV M ETERING EVICE If service or replacement is needed, follow manufacturer’s recommendations for more information. Call Dometic Technical Support. IGHT LASS See “Sight Glass/Moisture Indicator”... -
Page 14: Troubleshooting Guide
1. Circuit breaker off. Turn on or reset circuit breaker. pump) does not run. 2. Thermostat set incorrectly. Check thermostat. Set for a cooler setting. 3. High/Low pressure switch. Check the Dometic control for fault LP or 1A. Call technician. Fan or pump operates but 1. - Page 15 If this is the problem, replacement of the box or condensing unit may be the only solution. Table 6: Thermostat Display Error Messages (digital Dometic control) ERROR CODE DESCRIPTION AND CORRECTION High Pressure Fault...
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Page 16: Figures & Wiring Diagrams
FIGURES & WIRING DIAGRAMS Figure 1: KRA Cabinet-Type Condensing Units Figure 2: Various Flat-Plate Evaporators Flat plate with flanges Figure 3: Wrapped-Box Evaporator Figure 4: Flat-Plate Evaporator Designs FL = Flange Mount Figure 5: Digital Thermostat (Dometic Control) L-3571 ENGLISH... -
Page 17: Flat -Plate Evaporator Designs Digital Thermostat
KRA Refrigeration System Installation, Operation & Maintenance Manual Figure 6: Single-Plate System L-3571 ENGLISH... - Page 18 Figure 7: Dual-Plate System with Jumper L-3571 ENGLISH...
- Page 19 KRA Refrigeration System Installation, Operation & Maintenance Manual Figure 8: Installation Diagram - 2 Fish Boxes with KRA 433X L-3571 ENGLISH...
- Page 20 Figure 9: Installation Diagram - 3 Fish Boxes with KRA 450X L-3571 ENGLISH...
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Page 21: Emperature Chart
KRA Refrigeration System Installation, Operation & Maintenance Manual Figure 10: Refrigerant Pressure-Temperature Chart L-3571 ENGLISH... -
Page 22: Nit With 1 Box
Figure 11: Wiring Diagram for KRA 433X Unit with 1 Box L-3571 ENGLISH... - Page 23 KRA Refrigeration System Installation, Operation & Maintenance Manual Figure 12: Wiring Diagram for KRA 433X Unit with 2 Boxes L-3571 ENGLISH...
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Page 24: Nit With 2 Boxes . 23 Nit With 1 Box
Figure 13: Wiring Diagram for KRA 450X Unit with 1 Box DATE REVISION DESCRIPTION PROPRIETARY NOTE: THE INFORMATION CONTAINED WITHIN THIS DOCUMENT IS THE PROPERTY OF DOMETIC 7-26-15 REVISED NOTES & TITLE DESCRIPTION, CAD506-16 CORPORATION. ANY ATTEMPT TO COPY OR DISTRIBUTE... - Page 25 KRA Refrigeration System Installation, Operation & Maintenance Manual Figure 14: Wiring Diagram for KRA 450X Unit with 3 Boxes L-3571 ENGLISH...
- Page 26 NOTES L-3571 ENGLISH...
- Page 27 KRA Refrigeration System Installation, Operation & Maintenance Manual NOTES L-3571 ENGLISH...
- Page 28 DOMETIC MARINE DIVISION 2000 N. Andrews Ave. Pompano Beach, FL 33069 USA +1 954-973-2477 +1 954-979-4414 Email MarineSales@dometic.com 24/7 TECH SUPPORT FOR UNITED STATES AND CANADA 8:00 AM to 5:00 PM Eastern Time: +1 800-542-2477 After hours and weekends: +1 888-440-4494...
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