Service Manual

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
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
All *PC/*PH14M41 series model package units use a EEM
(Energy Efficient Motor) blower motor. The EEM is a 3 Phase
brushless DC (single phase AC input), ball bearing construc-
tion motor with an integral control module with an internal FCC
B EMI filter.
The EEM is continuously powered with line voltage. The
switched 24 volt control signal is controlled by the thermostat
in the cooling, heat pump and electric heat modes.
ELECTRICAL WIRING
The units are designed for operation at the voltages and fre-
quency as shown on the rating plate. All internal wiring is
complete. Ensure the power supply to the compressor con-
tactor 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.
WARNING