TM 9-4120-385-14
SECTION II. MAINTENANCE PROCEDURES
Table 5-2. CHECKING REFRIGERATION SYSTEM OUTPUT
PROCEDURE
STEP No.
Measure ambient outside temperature.
1
2
Operate air conditioner in COOL mode with maximum INCREASE
temperature setting for at least 15 minutes.
Measure condenser discharge air temperature which should be 20 F to
3
30 F (1 C to 7 C) above ambient.
4
Measure temperature of air going into (return) and out of (discharge)
evaporator section.
Discharge should be 15 F to 25 F (-4 C to 10 C) lower than return
5
air temperature.
5-2. GENERAL REPAIR PROCEDURES
NOTE
The following instructions are provided for use by refrigeration
shops furnished with only the most basic equipment. If more
complex equipment, such as two valve or four valve service
manifolds are available, they should be used by making appropriate
modifications to these instructions.
a. OPENING (BREAKING) THE SYSTEM.
1.
When the refrigeration system must undergo maintenance that requires the
system to be opened for removal and replacement of parts, the refrigerant must first be
released. Refer to Paragraph 5-5.
2.
After the repair is completed, a new dehydrator must be installed. The system
must then be leak tested, evacuated, and charged. Refer to Paragraphs 5-22, 5-3, 57, and
5-8.
b. REMOVAL OF PARTS.
1.
It may be necessary to remove some tubing and fittings with a part that is to be
replaced.
2.
The tubing and fittings can then be removed from the defective part and
installed on the new part.
Care should be exercised when opening joints or rebrazing to prevent damage to
3.
other parts of the air conditioner.
