Section Il. MOVEMENT TO A NEW WORKSITE
24. Dismantling for Movement
(1) Turn off electrical power supply to air
conditioner and disconnect power cable from unit.
(2) Disconnect drain hose from unit (if
Note. Disconnect duct work, CB filter and remote con-
trol cable, if used.
(3) Unbolt unit from mounting surface.
b. Short Distance Movement. Lift unit at base
with a forklift or carry unit to new worksite
Section Ill. CONTROLS
This section describes, locates, illustrates, and
provides the operator, crew, or organizational
about the various controls and instruments to en-
sure proper operation of the air conditioner.
Refer to figure 2-5 for location and operation of
controls and instruments.
2-7. Controls and Instruments
a. General. The purpose of the controls and in-
struments and the normal indication of the in-
struments are illustrated in figure 2-5.
pressure cutout switch, located at the top rear of
the air cpmdotopmer (fig. 2-5B), senses discharge
pressure from the refrigerant compressor
and will cut out at 445 (±10) psig. This action
stops operation of the compressor and condenser
fan motor. When the line pressure has reduced to
400 psi, the high-pressure cutout switch can be
reset by pushing the reset button.
c. Low-Pressure Cutout Switch. The low-pres-
sure cutout switch, located at the top rear of the
air conditioner (fig. 25B), senses suction line
pressure to the refrigerant compressor and will
cut out at 7 (±5) psig. This action stops opera-
tion of the compressor and fan motor. When the
line pressure has increased to 12 psi, the low-
pressure cutout switch can be reset by pushing
the reset button.
d. Liquid Line Sight Glass. The sight glass (fig.
2-2B) gives a visual indication of the dryness of
green and clear of bubbles. Moisture in the refrig-
erant system is indicated by the indicator turning
from green to chartreuse (caution) to yellow
(wet). A shortage of refrigerant in the system is
indicated by bubbles in the sight glass.
e. Two-Speed Condenser Fan Selector Switch.
using handles at sides of unit. Keep unit vertical.
c. Long Distance Movement. Crate the air con-
p r o v i d i n g a d e q u a t e p r o t e c t i o n f r o m
grilles and control panel. Refer to TM 38250 for
crate fabrication. Provide suitable blocking and
tiedowns to prevent
transfer. Keep unit vertical.
2-5. Reinstallation After
Reinstall the air conditioner
The two-speed fan switch (fig. 25D) provides
the user the option of selecting either HI-SPEED
or LO-SPEED air circulation. When the switch is
placed in the HI-SPEED position, the fan speed
will remain constant until the unit is either shut
down or the switch placed in the LO-SPEED po-
sition. An increase in compressor discharge pres-
sure to 400 (±16) psig will actuate the normally
open pressure switch (S3), causing the switch to
close and the fan speed to increase to HI-SPEED.
When the discharge pressure drops to 350 (±16)
psig, the pressure switch (S3) contacts will re-
turn to normally open and the fan speed will re-
turn to LO-SPEED.
f. Rotary Selector Switch. The operation of the
air conditioner is controlled by the rotary selector
switch located on the control panel (fig. 25D). It
has five positions:
Hi-HEAT, LO-HEAT, OFF,
VENTILATE, and COOL. When the switch is
placed in the HI-HEAT position, the fan motor is
actuated and all six heater elements are placed in
operation. Moving the selector switch to the LO-
HEAT position presents the same control se-
quence but reduces the heating capacity by
supplying power to only three heater elements.
When the switch is in the OFF position, all cir-
cuits beyond the switch are open. The VENTI-
LATE position turns on the fan motor to circulate
the air in the conditioned space, in the COOL posi-
tion, the fan motor and compressor motor are op-
erating to deliver cool air at the selected tempera-
g. Thermostat. The thermostat located on the
air conditioner control panel (fig. 2-5D) is man-
ually set to the desired temperature control point
in an operating range of 40° F to 90° F. Clock-
wise rotation calls for warmer air and counter-
clockwise rotation for cooler air. The selected
temperature is automatically maintained within 2
( ± 1 ) ° F.