PRODUCT DESIGN
4
DP13GM Package Gas Units are designed for outdoor in-
stallationsonlyineitherresidentialor light commercial appli-
cations and are available in 2 through 5 ton sizes. They are
designedfor 208/230voltsinglephaseapplications. (DP13GM
3, 4 and 5 ton models are also available for 230V 3 phase
applications.See Technical Manual RTD6312005.)
The connecting ductwork (Supply and Return) can be con-
nected for either horizontal or vertical airflow. In the vertical
application,amatching Roof Curb is recommended.
Areturnairfilter mustbeinstalledbehindthe returnairgrille(s)
or provision must be made for a filter in an accessible loca-
tionwithinthereturnairduct.Theminimumfilterareashould
not be less than those sizes listed in the Specification Sec-
tion. Under no circumstances should the unit be operated
withoutreturn air filters.
A3/4"pipeisprovidedforremovalofcondensatewaterfrom
the indoor coil. (Do not reduce the drain line size).
NOTE: Tightendrain to a maximum torqueof 10 in-lbs.
Refrigerant flow control is achieved by use of restrictor ori-
fices. DP13GM units use the FasTest Access Fitting Sys-
tem which consists of a saddle that is either soldered to the
suction and liquid lines or is fastened with a locking nut to
theaccessfittingbox (core)andthen screwedintothesaddle.
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.
Thesingle phase units use permanentsplitcapacitors(PSC)
designcompressors.Startingcomponents are therefore not
required. A low MFD run capacitor assists the compressor
to start and remains in the circuit during operation.
The outdoor fan and indoor blower motors are single phase
permanent split capacitor type motors. DP13GM48***41**
and DP13GM60***41** models are equipped with EEM in-
door blower motors. EEM motors are constant torque mo-
torswith verylowpowerconsumptionand are energizedbya
24V signal from the ignition control. The EEM features an
integratedcontrolmodule.
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.
Noadditionalrestriction (ductwork) shall beapplied.
Conditioned air is drawn through the filter(s), field installed,
across the coil and back into the conditioned space by the
indoorblower.
Some models of the DP13GM series package units use the
Compliant Scroll compressor, there are a number of design
characteristicswhich are different fromthe traditional recip-
rocatingcompressor.
- DuetotheirdesignScrollcompressorsareinherentlymore
tolerantofliquidrefrigerant.NOTE:Even thoughthecom-
pressor section of a Scroll compressor is more tolerant
ofliquid refrigerant, continued floodbackorflooded start
conditionsmaywashoil from the bearing surfacescaus-
ingpremature bearing failure.
- These Scroll compressors use "POE" or polyester oil
whichisNOTcompatiblewith mineraloilbasedlubricants
like 3GS. "POE" oil must be used if additional oil is
required.
- Compliantscroll compressors perform "quiet"shutdowns
thatallow the compressor torestartimmediately without
the need for a time delay. This compressor will restart
even if the system has not equalized.
- Operatingpressuresandamp drawsmaydifferfromstan-
dardreciprocating compressors.Thisinformationmaybe
foundinthe "Cooling Performance Data" section.
