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 H series package units use the Compliant Scroll com-
pressor, 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.
•
These scroll compressors use POE or polyolester oil which
is NOT compatiable with mineral oil based lubricants like
3GS. POE oil must 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
All *PC15/*PH16 model package units use a EEM blower mo-
tor. The EEM 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 EEM motor is continuously powered with line voltage. The
switched 24 volt control signal is controlled by the thermostat
in the cooling and heat pump mode.
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.
WARNING
WARNING
TO AVOID THE RISK OF PROPERTY DAMAGE,
PERSONAL INJURY OR FIRE, USE ONLY COPPER
CONDUCTORS.
LINE VOLTAGE WIRING
Power supply to the unit must be N.E.C. Class 1, and must
comply with all applicable codes. The unit must be electrically
grounded in accordance with the local codes or, in their ab-
sence, with the latest edition of the National Electrical Code,
ANSI/NFPA No. 70, or in Canada, Canadian Electrical Code,
C22.1, Part 1. A fused disconnected must be provided and
sized in accordance with the unit minimum circuit ampacity.
The best protection for the wiring is the smallest fuse or breaker
which will hold the equipment on line during normal operation
without nuisance trips. Such a device will provide maximum
circuit protection.
