Instrukcja obsługi Dometic KRA 450 X
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KRA Refrigeration Systems
❖
INSTALLATION • OPERATION
Refrigeration Systems
Revised: 20190115
L-2091 English❖
Part Number: LP-17
2❖ English
L-2091
Table of Contents
Refrigeration Systems • Introduction
Drawings and Diagrams .......................................................3
Refrigeration Basics ............................................................3
System Components ...........................................................3
Refrigerator/Freezer Boxes ..................................................4
Refrigeration Systems • Installation
Installation Procedures .......................................................5
Installing the Refrigeration Unit 5
Condensing Unit ..................................................................5
Evaporator ...........................................................................5
Constant Pressure Valve (CPV) and Linesets .....................5
Thermostatic Expansion Valve (TXV) Placement ................6
Dual Box Applications .........................................................6
Quick-Connect Fittings.........................................................6
Sight Glass/Moisture Indicator .............................................7
Thermostat ...........................................................................7
Refrigerant Charge ..............................................................7
Refrigeration Systems • Operation
KRA Refrigeration Start-Up Check List 8
Thermostat Operation ..........................................................8
Servicing Your Refrigeration System 9
Refrigerant ...........................................................................9
R-134a Tools ........................................................................9
Constant Pressure Valve (CPV) ...........................................9
Thermostatic Expansion Valve (TXV) ..................................9
Quick-Connect Fittings.........................................................9
Recharging the System 9
System Shutdown ................................................................9
Evacuate Refrigerant ...........................................................9
Charging the System .........................................................10
Setting the CPV .................................................................10
Adjusting the TXV ..............................................................10
Setting the Thermostat .......................................................11
Sight Glass ........................................................................11
Metering Device Replacement 11
CPV Replacement .............................................................11
TXV Replacement ..............................................................11
User Maintenance 11
Seawater System ..............................................................11
Defrosting ..........................................................................11
Winterizing the System ......................................................11
11
13
15
Troubleshooting Guide
BTU Guide - Refrigeration Loss/Gain Specs
Description of Figures
3 ❖ English
L-2091 Introduction
Warning
This manual contains essential safety information
concerning the safe and proper installation, operation
and maintenance of your refrigeration system. It is very
important that you read and understand the contents of
this manual thoroughly before using the equipment, and
you should keep it on your boat for future reference. Fail-
ure to follow company approved installation procedures,
and start-up and troubleshooting procedures will void
the warranty. If there are any statements in this manual
that you do not understand, contact the Dometic Service
Department or your local dealer for assistance.
Phone 804-746-1313 (8 am - 5 pm US Eastern Time),
Fax 804-746-7248, or email sales@dometicusa.com.
Notice
Your refrigeration system uses the refrigerant gas
R-134a. Federal law forbids the intentional release of
the refrigerant gas to the environment. You should make
certain that any fi eld service is performed by a specialist
with the proper equipment to prevent any loss of R-134a
during servicing.
Drawings and Diagrams
The fi gures that are referenced throughout this manual can be
found immediately after the warranty section. In addition, some
equipment may be shipped with specifi c installation sheets or
wiring diagrams that may supersede the information located in
this manual.
Refrigeration Basics
The instructions in this manual apply to all KRA refrigeration
units. Any variations are noted in the text.
KRA condensing units are combination air and water cooled.
The evaporator section may consist of stainless steel plates
installed in an insulated box, or may be copper tubing wrapped
around the box, and then insulated.
The system works by removing heat from the refrigerator/freez-
er compartment (box) and transferring that heat to the outside
air or seawater (depending on the condenser). Removing heat
from the box reduces its temperature. However, whenever the
compartment’s door is opened, more heat is introduced into
the box from the warmer outside air thus increasing the box
temperature. This added heat must be removed. Heat is also
transferred through the walls of the box; proper insulation will
reduce this heat transfer and keep the box cooler for longer
periods of time.
The refrigerant used is R-134a. It is EPA approved, but is
illegal to vent to the atmosphere. See previous notice.
System Components
The system consists of two main parts; the condensing unit,
and the evaporator section (refrigerator/freezer box). They
are connected by copper lines or fl exible hoses. Other parts
include the refrigerant expansion valve (constant pressure
or thermal expansion), thermostat, and seawater system for
water-cooled condensers.
Condensing Unit
All units have R-134a compressors, air-cooled or air/water-
cooled condensers, a receiver/dryer, and a sight glass. See
Figure 1.
Current Model:
1. The Cabinet Freezer (KRA) comes in an enclosed, painted
aluminum box. It is available with a 1/4 HP, 3/8 HP, or
1/2 HP compressor. There are no service valves. The unit
includes Aeroquip quick-connect couplings, a moisture
indicating sight glass, a receiver/fi lter/dryer and a suffi cient
charge of R-134a for almost all applications. Condenser
cooling is either air or a combination of air and water. See
Figure 1.
• Air cooling is benefi cial because the unit can operate
even with the boat out of water. However, the unit suf-
fers a drop in performance in ambient temperatures
above 100°F/38°C, and the compressor may be
damaged.
• Water cooled units are not affected by ambient tem-
perature and do not need ventilation. Water fl ow should
be about 250 gph per compressor HP.
• The combination air/water units provide the best of both
applications.
Obsolete Models:
1. The cabinet freezer (ACF, WCF, WACF, or KR types) came
in an enclosed, fi berglass box. It was available with a 1/4
HP or a 3/8 HP compressor. There were no service valves;
the gauges connected directly to the system. The receiver
had a sight glass to aid trouble-shooting. Condenser cool-
ing was either air, water, or combination air/water.
2. The WAAF033T had a 1/3 HP compressor, air and water
cooling, and service valves at the gauge connections. A
mechanical thermostat was included on the unit.
Refrigeration Systems • Introduction
Specyfikacje produktu
| Marka: | Dometic |
| Kategoria: | lodówka |
| Model: | KRA 450 X |
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