PRODUCT DESIGN
15
Air for condensing (cooling) is drawn through the outdoor coil
by a propeller fan, and is discharged vertically out the top of
the unit. The outdoor coil is designed for .0 static. No addi-
tional restriction (ductwork) shall be applied.
Conditioned air is drawn through the filter(s), field installed,
across the evaporator
coil and back into the conditioned space
by the indoor blower.
COMPRESSORS
Some GPC/GPH series package units use the Compliant Scroll
compressor, instead of traditional reciprocating compressors.
Still other models use reciprocating compressors.
A scroll is an involute spiral which, when matched with a mat-
ing scroll form as shown, generates a series of crescent shaped
gas pockets between the two members.
During compression, one scroll remains stationary (fixed scroll)
while the other form (orbiting scroll) is allowed to orbit (but not
rotate) around the first form.
As this motion occurs, the pockets between the two forms are
slowly pushed to the center of the two scrolls while simulta-
neously being reduced in volume. When the pocket reaches
the center of the scroll form, the gas, which is now at a high
pressure, is discharged out of a port located at the center.
During compression, several pockets are being compressed
simultaneously, resulting in a very smooth process. Both the
suction process (outer portion of the scroll members) and the
discharge process (inner portion) are continuous.
Some design characteristics of the Compliant Scroll compres-
sor are:
• Compliant Scroll compressors are more tolerant of liquid
refrigerant.
NOTE: Even though the compressor section of a Scroll
compressor is more tolerant of liquid refrigerant, continued
floodback or flooded start conditions may wash oil from the
bearing surfaces causing premature bearing failure.
• Compliant Scroll compressors use white oil which is com-
patible with 3GS. 3GS oil may be used if additional oil is
required.
• Compliant scroll compressors perform "quiet" shutdowns
that allow the compressor to restart immediately without
the need for a time delay. This compressor will restart even
if the system has not equalized.
NOTE: Operating pressures and amp draws may differ from
standard reciprocating compressors. This information can
be found in the unit's Technical Information Manual.
INDOOR BLOWER MOTOR
Some GPC/GPH model package units use a GE X13
TM
blower
motor while others use the standard PSC type blower motor.
The GE X13
TM
motor is a 3 Phase brushless DC (single phase
AC input), ball bearing construction motor with an integral con-
trol module with an internal FCC B EMI filter.
The GE X13
TM
motor is continuously powered with line voltage.
The switched 24 volt control signal is controlled by the thermo-
stat.
ELECTRICAL WIRING
The units are designed for operation at the voltages and hertz
as shown on the rating plate. All internal wiring is complete.
Ensure the power supply to the compressor contactor is brought
to the unit as shown on the supplied unit wiring diagram. The
24V wiring must be connected between the unit control panel
and the room thermostat.
WARNING
TO AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRIC SHOCK, WIRING TO THE UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
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