TM 9-4120-370-14
TO 35E9-229-1
Table 4-1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - (cont.)
Item
Item To Be
Procedures
No.
Inspected/Serviced
m. Turn TEMPerature control thermostat knob to fully IN-
CREASE (closewise) position, then turn mode selector
switch to COOL. Note that evaporator and condenser
fans start immediately and that compressor starts
approximately 30 seconds later. Hold your hand in air
flow from conditioned air outlet grille; there should be no
change in temperature. Now turn TEMPerature control
thermostat knob to fully DECREASE (counterclockwise)
position and feel outlet air temperature begin to drop al-
most immediately. Leave controls in present position and
perform next check.
n. After 15 minutes of operation, check the sight glass and
compare refrigerant condition with the color coded in-
formation plate provided. (See para 2-3.)
o. Turn mode selector switch to OFF and observe that all
air conditioner functions cease.
p. Set-up the air conditioner for the desired operational
mode.
q. Record performance of quarterly PMCS. including all
corrective actions taken.
Section V. TROUBLESHOOTING
4-16. GENERAL
This section contains troubleshooting information for locating and correcting most of the operating troubles
a.
which may develop in the air conditioner. Each malfunction for an individual component, unit, or system is fOl-
Iowed by a list of tests or inspections which will help you to determine corrective actions to take. You should
perform the tests/inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective acions. If
a malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
Table 42 lists the common malfunctions which you may find during the operation or maintenance of the air
C.
conditioner or its components. You should perform the tests/inspections and corrective actions in the order
listed.
NOTE
Before you use this table, be sure you have performed all applicable operating checks.
