Fire extinguishers must be readily available, in
good working order, and adequate for the
Safety tags with such notations as "Danger,"
"Hands Off," "Do Not Operate," and "Do Not
Throw Switch" should be attached to valves,
switches, and at other strategic locations when
servicing or making repairs.
Install machinery guards properly before
national codes, as well as DoD rules concerning safety,
must be observed. Some of the more important safety
steps that are often overlooked are as follows:
Protective equipment, such as eye protection,
gloves, hard hats, and so forth, must be available
The above is only a short list and not intended to be
all-inclusive. You will also find table W, appendix II,
"Troubleshooting Industrial Refrigeration," and
table Y, appendix II, "Troubleshooting Domestic
Refrigerators and Freezers," useful guides for locating
and correcting different troubles in refrigeration
Most problems with electrical motors for
refrigeration system compressors fall into what
How often is the coupling on the shafts of direct
drive motors realigned?
What piece of equipment is installed in a
refrigeration system just before the expansion
valve to remove moisture?
Manually defrosting is normally required on
refrigeration units that operate at what
If you suspect a component is open, you should
test the source in what way?
What unit of measurement on a multimeter do
you use to test for a short?
When checking for a ground, you use the same
troubleshooting procedure as used for what
Troubleshooting a refrigeration system depends
partly on your knowledge of how the equipment
runs normally. True/False.
Learning Objective: Understand the importance and
use of maintaining, operating, and inspecting logs for
When maintaining, standing watch, operating, or
inspecting refrigerating and air-conditioning
equipment, the Utilitiesman may be responsible for
keeping operation, inspection, or maintenance logs on
the equipment. Try to keep the logs neat and clean.
You must ensure that any information recorded in
them is accurate and legible.
Operation and maintenance logs may help to spot
trouble in the equipment. They also aid in ensuring
proper periodic maintenance and inspection are
performed on the equipment. Logs may provide a
means of self-protection when trouble occurs and the
cause can be placed on an individual.
Good judgment must always be used in analysis of
service troubles and specific corrections should be
followed whenever possible. One of the methods for
determining when and what corrective measures are
necessary on equipment or a plant which is not
operating properly is to compare the pressures and
temperatures of various parts of the system with
corresponding readings taken in the past when the
equipment or plant was operating properly under
similar heat load and circulating water temperature
A typical operating log may contain entries such as
Oil level in the compressor
Evaporator pressure and temperature
Condenser pressure and temperature
Discharge pressure and tem perature readings
Suction pressure and temperature readings
Date and time of readings
These types of readings give a complete picture of
the current and past operating conditions of the
equipment or plant and can assist the Utilitiesman in
keeping the equipment or plant at its maximum
Maintenance logs contain entries of when, what,
and who performed routine periodic maintenance on