Service Manual

PRODUCT DESIGN
16
NOTE: A roof curb can be used to utilize bottom discharge.
APG/GPG Package Units are designed for outdoor installa-
tions only in either residential or light commercial applica-
tions.
NOTE: To ensure proper condensate drainage, unit must be
installed in a level position.
The connecting ductwork (Supply and Return) can be con-
nected for either horizontal or down discharge airflow. In the
down discharge applications a matching Roof Curb is recom-
mended .
A return air filter must be installed behind the return air
grille(s) or provision must be made for a filter in an accessible
location within the return air duct. The minimum filter area
should not be less than those sizes listed in the Specification
Section. Under no circumstances should the unit be oper-
ated without return air filters.
A 3/4" - 14 NPT drain connector is provided for removal of
condensate water from the indoor coil. In order to provide
proper condensate flow, do not reduce the drain line size.
NOTE: Tighten drain to a maximum torque of 10 in-lbs.
Refrigerant flow control is achieved by use of thermostatic
expansion valves (TXV) or flowrator.
The single phase models use permanent split capacitors
(PSC) design compressors. Starting components are there-
fore not required. A low MFD run capacitor assists the
compressor to start and remains in the circuit during opera-
tion.
A/GPG16 three phase units use three phase compressors.
Starting components and run capacitors are therefore not
required.
A/GPG16 Package Gas Units are designed for outdoor
installations only in either residential or light commercial
applications and are available in 2, 2.5, 3, 3.5, 4 & 5 ton sizes.
They are designed for 208/230 volt single phase applications
or 208/230 volt 3 phase applications.
The connecting ductwork (Supply and Return) can be con-
nected for either horizontal or vertical airflow. In the vertical
application, a matching Roof Curb is recommended.
A return air filter must be installed behind the return air grille(s)
or provision must be made for a filter in an accessible location
within the return air duct (3 phase models have an internal
downflow filter rack). The minimum filter area should not be
less than those sizes listed in the Specification Section.
Under no circumstances should the unit be operated without
return air filters.
A/GPG16 model units use either EEM or ECM type indoor
blower motors. EEM motors are constant torque motors with
very low power consumption and are energized by a 24V
signal from the ignition control board. The EEM motors
feature an integrated control module.
ECM motors are constant airflow motors with very low power
consumption. ECM motors are controlled by passing 24
VAC signals through an interface board to the motor. ECM
motors feature an integrated control module.
Air for condensing (cooling cycle) 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 additional restriction (ductwork) shall be applied.
Conditioned air is drawn through the filter(s), field installed,
across the coil and back into the conditioned space by the
indoor blower.
A/GPG16 series package units use the Compliant Scroll
compressor; there are a number of design characteristics
which are different from the traditional reciprocating compres-
sor.
- Due to their design Scroll compressors are inherently
more tolerant of liquid refrigerant. NOTE: Even though the
compressor section of a Scroll compressor is more
tolerant of liquid refrigerant, continued flood back 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 oilbased lubri-
cants like 3GS. "POE" oil must be used if additional oil
is required.