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PRODUCT DESIGN
25
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 and DSX, DSZ 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.
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 and SSZ R-410A model units use the
Copeland Scroll "Ultratech" Series compressors which are
specifically designed for R-410A refrigerant.
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
MBR/MBE blower cabinets are designed to be used as a two-
piece blower and coil combination. MBR/MBE blower sec-
tions can be attached to cased evaporator coil. This two-
piece arrangement allows for a variety of mix-matching
possibilities providing greater flexibility. The MBE blower
cabinet uses a variable speed motor that maintains a con-
stant airflow with a higher duct static.
It is approved for applications with cooling coils of up to 0.8
inches W.C. external static pressure and includes a feature
that allows airflow to be changed by +15%. 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 pres-
sure.
The MBR/MBE 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 insula-
tion having a vapor barrier equivalent to ductwork insulation,
providing local codes permit.
The CAPX/CHPX coils are equipped with a thermostatic
expansion valve that has a built-in internal check valve for
refrigerant metering. The CACF/CAPF/CHPF coils are
equipped with a fixed restrictor orifice.
The coils are designed for upflow, counterflow or horizontal
application, using two-speed direct drive motors on the
CACF/CAPF/CHPX models and BPM (Brushless Permanent
Magnet) or ECM motors on the MBE models.