Dometic KRA 450X 1161 User Manual

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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

Table of Contents

Questions and Answers:

R
rhunterAug 17, 2025
Why is my Dometic KRA 450X 1161 running but not cooling?
- L
  lauracallahanAug 17, 2025
  If your Dometic Marine Equipment's compressor and fan (or pump) are running, but the box isn't cooling, it could be due to several reasons. First, check the fan and coil for proper airflow and ensure adequate ventilation, especially if the temperature exceeds 100°F/38°C. Also, inspect the seawater system for proper flow. Other potential causes include an incorrectly set Thermostatic Expansion Valve (TXV), which requires a technician's attention, or a low refrigerant charge, which necessitates checking for leaks and recharging the system with R-404A. A mechanical failure of the TXV could also be the culprit, requiring diagnosis and replacement by a technician.
A
angela66Aug 21, 2025
How to troubleshoot a Dometic KRA 450X 1161 Marine Equipment when compressor and fan do not run?
- M
  morristracyAug 21, 2025
  If the compressor and fan (or pump) of your Dometic Marine Equipment do not run, start by checking if the circuit breaker is off and turn it on or reset it if necessary. Then, check the thermostat and ensure it is set for a cooler setting. Also, the issue might be related to a High/Low pressure switch; in this case, check the Dometic control for fault codes LP or 1A and consider calling a technician.
M
murrayjonathanAug 25, 2025
What to do if Dometic KRA 450X 1161 fan runs but compressor doesn't?
- T
  Thomas OwensAug 26, 2025
  If your Dometic Marine Equipment fan or pump operates, but the compressor doesn't (and the high-pressure switch or thermal overload has tripped), check for low voltage to the unit, as the Klixon may be open. Also, check the fan and coil for proper airflow to ensure adequate condenser cooling. If the temperature is above 100°F/38°C, ventilate the area. Inspect the seawater system as well. The problem might be related to a High/Low pressure switch, requiring you to check the Dometic control for fault codes LP or 1A and consult a technician.
A
Andre HopkinsAug 29, 2025
How to fix Dometic Marine Equipment with unlit displays?
- C
  cgonzalezAug 29, 2025
  If the displays on your Dometic Marine Equipment are not lit, check the circuit breaker first to ensure that power is connected. Then, inspect all connections for any looseness. Also, verify that the voltage input of the control is correct. If these steps do not resolve the issue, consult a technician.
J
Julia CurrySep 1, 2025
Why does my Dometic KRA 450X 1161 Marine Equipment freeze and stop cooling?
- T
  Timothy BowmanSep 1, 2025
  If your Dometic Marine Equipment system starts to cool, but stops as plates freeze, check the sight glass for moisture. Yellow indicates moisture; green indicates a dry system.
L
Lisa AlexanderSep 5, 2025
How to improve cooling of Dometic KRA 450X 1161 box?
- A
  Amanda StewartSep 5, 2025
  If your Dometic Marine Equipment is not cooling the box sufficiently, turn the unit OFF and defrost it according to the instructions in 'Defrosting'. Ensure that the thermostat is properly set. Minimize the amount of time the box is open to prevent warm air from entering. If you've recently added many warm items, allow the unit time to cool them. Replace any poor seals and ensure there's a drain plug. Other potential issues include an improperly set Thermostatic Expansion Valve (TXV), low refrigerant charge, high condensing temperature (introduce cooler air into the compartment), improperly mounted temperature sensor, moisture in the system, or inadequate design.
T
theresasheaSep 8, 2025
What causes Dometic KRA 450X 1161 Marine Equipment compressor to run but seawater pump to fail?
- M
  Michael LeblancSep 9, 2025
  If the compressor operates, but the seawater pump doesn’t for your Dometic Marine Equipment, turn on or reset the pump breaker. Check the pump relay and pump relay trigger.

Dometic KRA 450X 1161 Specifications

General

Brand	Dometic
Model	KRA 450X 1161
Category	Marine Equipment
Language	English

Summary

SAFETY INSTRUCTIONS

READ THIS MANUAL BEFORE PROCEEDING

Crucial information for proper installation and operation of KRA refrigeration systems.

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

SAFETY GUIDELINES

Essential rules for qualified technicians regarding electrical and refrigerant handling safety.

SAFE HANDLING OF REFRIGERANTS

Guidelines for preventing refrigerant release and ensuring safe practice with R-404A.

SYSTEM COMPONENTS

SEAWATER SYSTEM

SYSTEM INSTALLATION

INSTALLATION SAFETY CONSIDERATIONS

Critical safety warnings, especially regarding electrical shock hazard during installation.

INSTALLING THE REFRIGERATION SYSTEM

REFRIGERATION SYSTEM OPERATION

START-UP CHECKLIST AND PROCEDURES

THERMOSTAT AND CONTROL OPERATION

PARAMETER PROGRAMMING

SERVICING YOUR REFRIGERATION SYSTEM

REFRIGERANT AND SYSTEM PREPARATION

SYSTEM SHUTDOWN AND EVACUATION

Procedures for safely shutting down the unit and evacuating refrigerant.

RECHARGING AND CHARGING THE SYSTEM

Detailed steps for evacuating and recharging the refrigeration system with R-404A.

USER MAINTENANCE

TROUBLESHOOTING GUIDE

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