Service manual

PRODUCT DESIGN
58
This section gives a basic description of cooling unit opera-
tion, its various components and their basic operation.
Ensure your system is properly sized for heat gain and loss
according to methods of the Air Conditioning Contractors
Association (ACCA) or equivalent.
CONDENSING UNIT
The condenser air is pulled through the condenser coil by a
direct drive propeller fan. This condenser air is then dis-
charged out of the top of the cabinet. These units are
designed for free air discharge, so no additional resistance,
like duct work, shall be attached.
The suction and liquid line connections on present models
are of the sweat type for field piping with refrigerant type
copper. Front seating valves are factory installed to accept
the field run copper. The total refrigerant charge for a normal
installation is factory installed in the condensing unit.
GSX, GSZ, ASX, ASZ, SSX, SSZ, DSX, DSZ, VSX, and VSZ
models are available in 1 1/2 through 5 ton sizes and use R-
410A refrigerant. They are designed for 208/230 volt single
phase applications.
GSX/GSZ *****2 models are available in 2 and 3 ton sizes and
use R-410A refrigerant. They are designed for 220/240 volt
single phase applications.
GSX/GSZ *****3 models are available in 3, 4, and 5 ton sizes
and use R-410A refrigerant. They are designed for 208/230
volt 3-phase applications.
GSX/GSZ *****4 models are available in 3, 4, and 5 ton sizes
and use R-410A refrigerant. They are designed for 380/420
volt 3-phase applications.
GSX/GSZ *****5 models are available in 3, 4, and 5 ton sizes
and use R-410A refrigerant. They are designed for 380/420
volt 3-phase applications.
ASX, ASZ, DSX and DSZ R-410A model units use the
Copeland Scroll "Ultratech" Series compressors which are
specifically designed for R-410A refrigerant. These units also
have Copeland
®
ComfortAlert diagnostics.
GSX, GSZ, SSX, SSZ, VSX, and VSZ R-410A model units,
except for GSX130181C*, VSX130181B*, VSX130241E*,
VSX130421B*, and VSX130481B*, use the Copeland Scroll
"Ultratech" Series compressors which are specifically de-
signed for R-410A refrigerant.
ASXC, ASZC, DSXC, DSZC models are available in 2
through 5 ton sizes and use R-410A refrigerant. They are
designed for 208/230 volt single phase applications.
ASXC, ASZC, DSXC, DSZC R-410A model units use the
Copeland Scroll "Ultratech" Series compressors which are
specifically designed for R-410A refrigerant. These units also
have Copeland
®
ComfortAlert diagnostics. The Copeland
®
ComfortAlert diagnostics are integrated into the unitary (UC)
control. These models are ComfortNet
TM
ready.
There are a number of design characteristics which are
different from the traditional reciprocating and/or scroll com-
pressors.
"Ultractech" Series scroll compressors will not have a dis-
charge thermostat. Some of the early model scroll compres-
sors required discharge thermostat.
"Ultratech" Series 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 required.
COILS AND BLOWER COILS - LEGACY
MODELS
MBR/MBE/MBVC blower cabinets are designed to be used
as a two-piece blower and coil combination. MBR/MBE/
MBVC blower sections can be attached to cased evaporator
coil. This two-piece arrangement allows for a variety of mix-
matching possibilities providing greater flexibility. The MBE/
MBVC blower cabinets use a variable speed motor that
maintains a constant airflow with a higher duct static.
MBE/MBVC blower cabinests are approved for applications
with cooling coils of up to 0.8 inches W.C. external static
pressure. The MBE models includes a feature that allows
airflow to be changed by +10% or -15%. The MBVC models
allow airflow trimming of +/-10%.
The MBR blower cabinet uses a PSC motor. It is approved for
applications with cooling coils of up to 0.5 inches W.C.
external static pressure.
The MBR/MBE/MBVC blower cabinets with proper coil
matches can be positioned for upflow, counterflow, horizontal
right or horizontal left operation. All units are constructed with
R-4.2 insulation. In areas of extreme humidity (greater than
80% consistently), insulate the exterior of the blower with
insulation having a vapor barrier equivalent to ductwork
insulation, providing local codes permit.
The CAUF, CAPF and CAPT coils are designed for upflow and
counterflow applications. The CACF and CHPF coils are
designed for horizontal applications.
Communicating Unitary Control (UC) PCB
The Communicating System Unitary Control PCB is a micro-
processor-based control for heat pump and air conditioning
condensing units with single-phase compressors up to 5 ton
capacity operating on standard residential or Delta and Wye
commercial power. The control incorporates the basic func-
tionality of existing defrost controls, outdoor thermostats,
contactors, compressor staging controls, short cycle con-
trols, line voltage monitors, Comfort Alert™ or CoreSense
Module (dependent upon which module you are using), two
speed condenser fan relays and the Active Protection com-
ponent of enabled thermostats. The control is designed to
work as part of a fully communicating HVAC system with 4
wires. The control also supports legacy 24VAC thermostat
inputs for Y1, Y2, O and 24VAC outputs for RVS, W1, and L
for non-communicating systems. Outputs include compres-
sor power, compressor stage select, and outdoor fan high
and outdoor fan low speed. System inputs include high/low
pressure switches, as well as thermistor inputs for outdoor
coil temperature and outdoor air temperature.