Stulz CeilAiR Series, Инструкция по установке, эксплуатации и обслуживанию

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(Mar, 2012)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
4.3 Field Service
NOTE
Do not attempt to make repairs without the
proper tools.
It may be necessary to perform repairs on the re-
frigeration system. If fi eld repairs are necessary, the
following procedures apply:
1. Ensure all electrical connections are tight.
2. Check all fuses, contacts and wiring. Contactors
should be replaced if contacts are worn or pitted.
4.3.1 Leak Detection
Several methods can be used to detect a leak in
the refrigeration system. The most modern and
easiest method is to use an electronic leak detector.
Follow the manufacturer’s directions and any leak
can be quickly located. A second method is to use
soap bubbles. Apply a solution of soapy water with
a brush or sponge to the joints and connections in
the refrigeration lines. A leak in the lines will cause
bubbles to form.
NOTE
Halogen leak detectors are inefective with
R407C refrigerant because unlike R22 refrig-
erant, R407C does not contain chlorine.
4.3.2 Leak Repair
When a leak is located, properly reclaim the remain-
ing refrigerant charge before beginning repairs.
Adjacent piping must be thoroughly cleaned by
removing all paint, dirt and oily fi lm. Use a wire brush,
sandcloth or sandpaper and wipe the area with clean,
dry cloths. Protect nearby parts from heat damage by
wrapping with water-soaked cloths.
4.3.3 Refrigerant Piping
When replacing components within the cabinet of the
unit the following consumable materials are recom-
mended. Use Silfos alloy for copper-to-copper (piping
discharge or suction line repairs). Silver solder (Stay-
Silv #45) and fl ux are to be used on copper-to-brass
or copper-to-steel repairs. For liquid line repairs at
the drier, strainer, sight glass, or expansion valve,
use a 95 % tin to 5 % antimony solder with fl ux.
When component replacement is complete, remove all
traces of fl ux. After any repair, pressure check the sys-
tem to check for leaks prior to recharging the system.
4.3.4 General Common Repairs/ Component
Replacement
4.3.4.1 Compressor Failure
The compressor is the most important component
of the air conditioner. Numerous safety devices are
provided to protect the compressor from failing.
If a compressor failure has occurred, determine
whether it is an electrical or a mechanical failure.
An electrical failure will be indicated by the distinct
pungent odor once the system has been opened. If a
burnout has occurred, the oil will be black and acidic.
A mechanical failure will have no burned odor and
the motor will attempt to run, an abnormal or exces-
sive noise may be present.
An analysis of the oil is the only way to ensure
the proper procedure for cleaning the refrigerant
system. Acid test kits are available from several
manufacturers for measuring the acid level in the
oil. These are capable of making quite accurate
acid measurements, but if they are not available, a
check of the oil by sight and smell can give a quick
indication if contamination remains in the system.
Since refrigeration oil varies in color, a sample of the
new oil in the replacement compressor should be
removed prior to installation and sealed in a small
glass bottle for comparison purposes. If the oil has
been exposed to refrigerant, the bottle should not
be tightly capped, since the residual refrigerant may
create a high pressure if tightly sealed and exposed
to high temperature.
All electrical connections should be checked to be
sure that they are tight and properly made. Check all
fuses, contactors and wiring. The contactor should be
examined and replaced if contacts are worn or pitted.
If there is acid in the oil, there has been an
electrical failure which has caused the compressor
motor to burn out. The acid diffuses throughout
the refrigeration system and must be removed by
using a burnout fi lter kit before a new compressor
is placed in service. Not only must the compressor
be replaced, but also the entire refrigeration circuit
must be cleaned of the harmful contaminants left by
the burnout. See section 4.3.4.3 (Burn-Out/Acidic
Cleanup) for the proper procedure.
If there is no acid in the oil, there has been a
mechanical failure. See section 4.3.4.2 (Standard
Cleanout) for the proper cleaning procedure.
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