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Table 3-1. Preventive Maintenance Checks and Services
Operator’s Maintenance Category
Interval and sequence
Before
operation
1
2
3
4
5
6
7
8
9
number
During
operation
10
11
After
operation
12
13
14
15
16
17
18
Item to be
inspected
Evaporator outlet louver.
Evaporator inlet louver.
Condenser cover.
Fresh air inlet
Drains
Condenser louver.
Condenser guard.
Controls
Main power receptacle connector
Liquid sight indicator
Air conditioner operation.
Condenser cover.
Procedure
Remove obstructions. Clean louvers.
Tighten
mounting screws.
Remove obstructions. Clean louvers. Check for
ease of operation. Tighten mounting screws.
With cover rolled up for operation check securing
ties for damage.
Inspect for obstructions and insecure mounting.
Remove obstructions clean and tighten loose
mounting screws.
Inspect drains for obstructions. Remove ob-
structions.
Check for insecure mounting and damaged
louvers.
Remove obstructions and clean guard.
Check for visual damage. Check operation of
damper control.
Check for secure power connection. Tighten if
necessary.
Check for moisture and low refrigerant charge.
Yellow indicates moisture bubbles or milky
appearance indicates low charge.
Check for abnormal operation, vibration, unusual
noise, failure to respond to controls.
Check for damaged fasteners.
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3-2
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