19
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
451
Learning Objectives
Information in this chapter will enable you to:
Check domestic compression refrigerators for proper
installation.
Use the proper procedure for starting a domestic
refrigerator-freezer.
Interpret common symptoms of system malfunction.
Use proper procedures to test a domestic-
refrigerator-freezer’s auxiliary circuits.
Explain the use of piercing valves, pinching tools,
and valve adapters.
Interpret temperature and pressure conditions inside
a refrigeration system to determine points of failure.
Summarize common symptoms of internal
component failure and their possible causes.
Technical Terms
common wire
hot wire
inspection mirror
listing
mullion heater
pinch-off tool
process tube
troubleshooting chart
ultrasonic
valve adapters
voltmeter
Review of Key Concepts
Reviewing these concepts from earlier chapters will help
you understand new concepts presented in this chapter:
Decreasing the pressure on a gas causes the gas to
expand and causes its temperature to drop. This
phenomenon, along with a state change from liquid
to gas, provides the cooling action in a refrigeration
system. (Chapter 1)
A fi lter-drier removes moisture. This moisture might
otherwise freeze in the metering device. Moisture
is also harmful when mixed with oil in a system
because it forms sludge and acid. (Chapter 2)
Brazing is one of the best methods of making leak-
proof connections in refrigeration lines. A good braze
joint requires proper preparation and technique.
(Chapter 4)
Troubleshooting is the analysis of a problem.
This analysis is generally guided by a chart
provided by the manufacturer of the equipment.
(Chapter 5)
HVACR technicians must be certifi ed by the EPA
to handle refrigerants in cylinders and charge them
into refrigeration systems. Specialized equipment
is used to handle refrigerants, perform refrigeration
system service, and pull a vacuum. (Chapter 7)
The majority of electrical problems can be narrowed
down to the following common problems: a
short circuit, a short to ground, an overload, an
unintentional voltage drop, or an open circuit.
(Chapter 10)
Motor controls turn the compressor motor
off when the conditioned space reaches the
desired temperature and turn it on again when
the conditioned area has warmed to a certain
temperature. (Chapter 13)
Introduction
In order to effectively troubleshoot a domestic
refrigerator-freezer, a technician must fi rst have a good
understanding of how it works. Good troubleshooting
begins by eliminating the simplest and most common
possible problems fi rst. After the simplest possible causes
have been eliminated, other potential causes of problems
should be methodically checked and eliminated.
Installation and
Troubleshooting of
Domestic Refrigerators
and Freezers
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