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TM 5-4120-377-14
TABLE 4-1. ORGANIZATIONAL PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS) (cont.)
Item
Item To Be
No.
Inspected/Serviced
Procedures
k. Turn TEMPerature control thermostat knob to fully INCREASE
(clockwise) position and then turn mode selector switch to LO
HEAT. Place your hand in air flow from the conditioned air
outlet grille and feel for a temperature rise. When discharge air
temperature has reached a relatively stable level, turn mode
selector switch to HI HEAT and feel for a further temperature
rise. Next, turn Temperature control thermostat knob to fully
DECREASE (counterclockwise) position. Feel that discharge
air temperature drops to approximately same relatively stable
level previously noted in LO HEAT. Finally, turn mode selector
switch to LO HEAT and feel discharge air temperature drop to
ambient level.
NOTE
The temperature control thermostat has an effective
functional range between 40°F and 90°F (5°C and
32°C). In extreme conditions when ambient air
temperature is below 40°F (5°C) or above 90°F
(32°C), operation in either LO HEAT or HI HEAT
mode will vary from that described above.
l. Turn TEMPerature control thermostat knob to fully INCREASE
(clockwise) 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 condensed 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 almost immediately. Leave controls in present
position and perform next check.
m. After 15 minutes of operation check the sight glass and
compare refrigerant condition with the color coded information
plate provided. (See para 2-3.)
n. Turn mode selector switch to OFF and observe that all air
conditioner functions cease.
o. Set-up the air conditioner for the desired operational mode.
p. Record performance of quarterly PMCS, including all
corrective actions taken.
4-38
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