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
NOTE
If power has been connected to unit, a short (30
minute maximum during very cold weather) warm
up period is required for COOL mode operation.
When compressor reaches a safe operating tem-
perature, it will come on automatically if the mode
selector is in the COOL mode.
b. Check that the fabric cover is rolled up and secured,
c. On models F36T-2SA and F36T4-2SB only Open the
Condenser Discharge Air Deflector Door.
d. Adjust conditioned air intake and outlet louvers to the full
open position.
e. Adjust fresh air damper to full closed position,
f, Turn mode selector switch to VENTILATE, Fan should
start.
g. Use a paper streamer or smoke and note amount of air
being discharged from conditioned air outlet grille.
h. Open fresh air damper fully.
i. Close conditioned air intake grille louvers fully.
j. Again check air flow as in step g. above, Air flow should
be approximately the same.
k. Fully open louvers in conditioned air intake grille and fully
close fresh air damper.
1. Turn TEMPerature control thermostat knob to fully IN-
CREASE (clockwise) position and then turn mode selec-
tor 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 rel-
atively stable level, turn mode selector switch to HI
HEAT and feel for a further temperature rise. Next, turn
TEMPerature control thermostat knob to fully DE-
CREASE (counterclockwise) position. Feel that dis-
charge air temperature drops to approximately same
relatively stable level previously noted in LO HEAT. Fi-
nally, turn mode selector switch to LO HEAT and feel
discharge air temperature drop to ambient level.
NOTE
The TEMPerature control thermostat has an effec-
tive functional range between 40F and 90F (5C
and 32C). In extreme conditions when ambient air
temperature is below 40F (5C) or above 90 CF
(32C), operation in either LO HEAT or HI HEAT
mode will vary from that described above.
4-34
