Operation - TM-55-1915-200-100520

TM 55-1915-200-10

room on the right side of door and the inside chill room

2-5.4.4.2. Operation. (FIGURE 2-116)

on the left side of freeze room door.

h. Check that system cycles at proper temperature

a. Turn freeze room thermostat (12, Sheet 4 of 4)

settings by monitoring unit cooler fans when cycling on

to -100F setting.

and checking thermometer settings at unit cooler fan

b. Turn chill room thermostat (12) to 36-380F

when turning off.

setting.

2-5.4.4.3. Operation After First 24 Hours. (FIGURE 2-

NOTE

116)

Outboard compressor and control

box above it is for freeze room, and

a. Check compressors (3 and 5, Sheet 1 of 4) for

inboard compressor and control box

knocking, cavitation, and unusual noises.

is for chill room.

b. Check thermometers outside chill room door

and inside chill room on left side of freeze room door for

c. Set circuit breaker (3, FIGURE 2-101, Sheet 16

proper temperature settings.

Chill room, 36-38 ;

of 21) on power panel P2 in upper machinery room to

freeze room, -10 .

ON (up) (freeze room) and circuit breaker 4 to ON (chill

c. Check thermostats (12, FIGURE 2-116, Sheet 3

room).

of 4) under each room unit cooler for proper setting.

d. Set power switches located on upper left side of

d. Check each unit cooler coil behind cooler fan

compressor control boxes (1 and 2, FIGURE 2-116,

(11) for excessive ice buildup.

Sheet 1 of 4) to ON (up).

e. Observe unit cooler fans (11) to determine if

each is operating freely.

CAUTION

f. Check drain pans in each unit cooler for

After refrigeration unit startup, if

excessive amount of water.

grinding noises are heard from

compressors or motors or leaks

g. On poop deck aft, observe each condenser fan

observed in piping, shut power off

(9) for free rotation.

on control boxes (1 and 2) by setting

power switches to off (down)

NOTE

immediately.

Refer

unit

If any problems or defects resulting

maintenance.

from these checks are observed,

refer to unit maintenance.

e. Turn door seal heater control (14, FIGURE 2-

2-5.4.4.4. Shutdown. (FIGURE 2-116)

116, Sheet 4 of 4) to 1400F.

f. Check liquid refrigerant sight glasses (4,

a. Check that thermostats (12, Sheet 3 of 4) in chill

FIGURE 2-116, Sheet 1 of 4) located behind

room and freeze room are set to proper temperature

condensers (3 and 5). If bubbles appear, refrigerant is

settings. Chill room, 36-38 ; freeze room, -10 .

low. Refer to unit maintenance.

g. Monitor system temperatures on the monitor

thermometers (13, Sheet 3 of 4) located outside the chill

2-356