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PRODUCT DESIGN
14
The outdoor fan motors are single phase capacitor type mo-
tors.
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
The *PH15 4 and 5 ton M series package heat pump units use
a two-stage scroll compressor. The two-step modulator has
an internal unloading mechanism that opens a bypass port in
the first compression pocket, effectively reducing the displace-
ment of the scroll. The opening and closing of the bypass port
is controlled by an internal electrically operated solenoid.
The ZPS two-step modulated scroll uses a single step of un-
loading to go from full capacity to approximately 67% capac-
ity. A single speed, high efficiency motor continues to run while
the scroll modulates between the two capacity steps.
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.
• These Scroll compressors use “POE” or polyolester oil
which is NOT compatible with mineral oil based lubricants
like 3GS. “POE” oil must be used if additional oil is re-
quired.
• 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
GPH15 M series model package units use a GE X13
TM
blower
motor The GE X13
TM
motor is a 3 Phase brushless DC (single
phase AC input), ball bearing construction motor with an inte-
gral control 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 in the cooling and heat pump mode and the blower relay in
the electric heat mode.
APH15 M series model package units use an ECM blower
motor. These motors offer greater airflow flexibility as well as
dehumidification. The airflow delivery for these models can be
adjusted by changing the position of dip switches on a low
voltage terminal board.