TM 9-2330-271-14&P
b. Removal.
(1) Disconnect power cables.
each return air grille. Remove grilles from partition.
(2) Disconnect ducts from rear of air
(2) Unfasten and remove capillary tube
conditioner.
securing clips between air conditioner units. Take care
(3) Loosen hose clamps and disconnect the
not to kink, unduly bend or otherwise disturb soft copper
condensate hoses.
tubing. Exercise caution in handling sensitive capillary
(4) Remove attaching hardware from base of
tubes. Let tubes and tubing sag and hang in place.
air conditioner.
Stow clips where they will not be lost.
(5) Slide the air conditioner through the door
(3) Unscrew and remove slotted plates
opening while carefully supporting it.
attached to air conditioner housings. Note that slotted
(6) Use a suitable fork lift truck and remove the
sections fit around lower cables but that capillary tubing
unit from the semitrailer.
enters these plates through two holes at top. To remove
c. Installation.
plates, move them along copper tubes to capillary tubes,
(1) Use a suitable fork lift truck and place the
and then past these tubes.
unit in the semitrailer.
(4) Unfasten and remove long narrow plate
(2) Slide the air conditioner onto the mounting
through which remote control cables enter the control
base.
unit housing. Move plate back along cables far enough
(3) Secure air conditioner with attaching
to obtain access to connector assemblies within the
hardware.
housing.
(4) Install hoses and tighten hose clamps.
(5) Reach through access openings in control
(5) Connect ducts to rear of air conditioner.
assembly casting and disconnect cables.
(6) Connect power cables.
(6) If it is necessary to remove narrow plate
from cables, remove grommets from plate and slide
plate over the connectors at the cable ends.
9-7. Air Conditioner Remote Control Unit, XM822
(7) Unfasten and remove remote control
a. Removal.
housing cover from front face of control unit assembly.
(8) Unfasten and remove each control unit from
(1) Remove screws attaching unit to electrical
its assembly base. Exercise caution to prevent damage
control panel.
to capillary tubes and to prevent kinking, unduly bending,
(2) Partially remove control panel and
or deforming soft copper tubing.
disconnect wires from rear of unit.
b. Installation.
Install remote control units in
b. Installation.
reverse order of paragraph 95a, paying particular
(1) Attach wires to rear of unit.
attention to the following:
(2) Position unit on electrical control panel and
(1) The wiring of the two lower control units
secure with attaching hardware.
must be carefully curved around the remote control units
to fit through upper two holes in slotted places on right
9-8. Heating System, XM654, XM680, XM680E1
side of remote control housing.
(2) Assemble narrow plates around the two
Heat for the XM654, XM680 and XM680E1 semitrailers
lower cables, one plate with open slot ends toward inside
is supplied through heat strips located in the air
of van, and the other plate with open slot ends toward
conditioners.
outside of van.
(3) Use care to prevent damage to the capillary
9-9. Heating System, XM822
tubes and the tubing.
a. The XM822 semitrailer has a heating system
9-6. Air Conditioner, XM822
composed of a heater assembly consisting of 12 heating
elements located in the air conditioning duct to the rear
a. General. The XM822 semitrailer is equipped with a
of the air conditioner.
model 76E34104, 208volt, three phase, 60 Hz, 60, 000
b. The heater assembly contains six 1000watt,
BTU air conditioner, mounted inside the front door. The
220volt elements located on the lower tier, and six
remote control unit is located in the main control panel in
1600watt, 220volt elements located on the upper tier of
the laboratory compartment.
the heater assembly.
c. The remote control unit is located on the left
wall, forward of the main control panel.
9-4