PRODUCT DESIGN
5
DCG Light Commercial Package Gas Units are designed for
outdoor installations only, primarily in light commercial appli-
cations and are available in 208-230 volt three phase, 460
volt three phase and 575 volt three phase in 7.5, 8.5, 10 and
12.5 tons with 2 compressors.
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.
The removal of condensate water from the indoor coil can be
achieved by either the 3/4" NPT male fitting on the side of the
unit or by the 3/4" NPT male fitting located on the bottom of
the condensate pan. (Do not reduce the drain line size).
Refrigerant flow control is achieved by use of
a flowrater
type metering device.
DCG units use the FasTest Access Fitting System which
consists of a saddle soldered to the suction and liquid lines
and then screwed into the saddle.
NOTE: The core must
not be removed from the saddle until the refrigerant
charge has been removed. Failure to do so could result
in property damage or personal injury.
All units have 3-phase belt drive indoor blower motors that
are energized through the blower motor contactor.
For 2 speed models, the indoor blower will operate on low
speed when in "Fan Only" mode or while in first stage 'Cool-
ing" mode. Unit will operate on high speed in "Heating" mode
and while in second stage "Cooling" mode.
Filters are factory supplied in the return air compartment up-
stream from the indoor coil. The minimum filter area should
not be less than those sizes listed in the Specification Sec-
tion. Under no circumstances should the unit be operated
without return air filters.
Air for condensing (cooling cycle) is drawn through the out-
door 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), across the coil
and back into the conditioned space by the indoor blower.
The DCG series package units use the Compliant Scroll com-
pressor; there are a number of design characteristics which
are different from the traditional reciprocating compressor.
-
Due to their design Scroll compressors are inherently more
tolerant of liquid refrigerant.
NOTE
: Even though the com-
pressor 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 caus-
ing 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.
-
Operating pressures and amp draws may differ from stan-
dard reciprocating compressors. This information may be
found in the “Cooling Performance Data” section.
Location and Clearances
36” Min.*
36”*
Min.
36”
Min.*
* In situations that have multiple units a minimum of 48" is
required between the condenser coils.
Outside Slab - Multi-positional
NOTE:
A clearance of 48" is recommended on all sides of
the unit and 75" total clearance is recommended on the main
control panel side to facilitate possible fan shaft, coil, elec-
tric heat and gas furnace removal. See figure above.
Roof overhang should be no more than 36" and provisions
made to deflect the warm discharge air out from the over-
hang. Minimum clearances are required to avoid air recircu-
lation and keep the unit operating at peak efficiency.
