036-21540-001-A-0503
6
Unitary Products Group
Floor mounted units should be secured on a solid, level
pad or sturdy stand. The base of the unit should be
approximately 6 inches higher than the lower edge of
the wall opening. This height will allow the condenser
air ducts to be pitched away from the unit, offering pro-
tection from rain water entering the base pan (refer to
typical installation diagram on Page #4). The use of an
isolating rubber sheet is recommended to reduce vibra-
tion and noise transmission. Ensure that the entire
base is continuously supported - do not support unit at
corner points only! Unit may be pitched slightly to
ensure efficient drainage of condensate.
EVAPORATOR / CONDENSER SEPARATION
- (All
models except 20 and 25 Ton)
•
Reclaim the entire refrigerant charge from each
compressor circuit.
•
Disconnect the evaporator motor high voltage
wires at contactor/overload "C4/OL4". Pull all wir-
ing into the evaporator compartment. Remove
bushing/clamp from routing hole for evaporator
motor wiring.
•
Cut and remove sections of all liquid and suction
refrigerant lines. Make two cuts in each line,
approximately 6 inches above and below the evap-
orator floor/condenser roof. Use a tubing cutter
only
- do not use a hacksaw to cut refrigerant tub-
ing!
•
Remove the corner securing brackets from the out-
side corners of the cabinet, at the joint line
between the evaporator and condenser sections.
•
Remove the evaporator section.
ASSEMBLY OF SPLIT UNITS
- (All models)
•
Place the condensing section in the required loca-
tion.
•
Carefully position the evaporator section atop the
condensing section. Align all sides, the evaporator
motor wire routing hole, and the refrigerant line
routing holes.
•
Install the securing brackets at all four corners, on
the evaporator/condenser separation joint. Note
that one bracket, intended for use at the corner
with the drain fitting, has a short "leg".
•
Use appropriate tubing couplings and splice previ-
ously cut refrigerant lines. (
On 20 and 25 Ton mod-
els, remove spun end caps with a tubing cutter -
after releasing nitrogen pressure at shraeder fit-
tings. Short tubing sections and couplings are
shipped with unit to connect refrigerant circuits
).
•
Pressure test refrigerant circuits with dry nitrogen
(300 psig ).
•
Evacuate each circuit to at least 350 microns. If
gauge pressure rises above 500 microns in one
minute, evacuation is incomplete or the system has
a leak.
•
Charge circuit(s) to the value indicated on the unit
nameplate.
•
Install bushing/clamp into evaporator wiring routing
hole, and pull wires through into electrical control
panel. Connect motor leads to load terminals on
contactor/overload relay "C4/OL4".
•
Ensure evaporator motor rotation is correct upon
unit start-up. Switch any two wires at contactor
"C4" if blower rotation is not correct.
