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The GSSD split unit has been ARI rat-
ed with the Trane TWE air handlers
with ICM 2 variable speed motors to
create a complete split system for res-
idential applications. The GSSD
equipment is completely assembled,
piped, internally wired and test operat-
ed in the factory. The GSSD equip-
ment is ETL and CSA listed.
A prewired terminal strip is provided
for field control wiring.
The system water inlet and outlet con-
nections are female 1-inch National
Pipe Thread (NPT) swivel quick con-
nectors with stainless steel stop ring to
simplify field installation.
The GSSD units are shipped with a
pressurized dry nitrogen holding
charge to ensure clean components.
All equipment has easy to read decals
and labels to aid in service of unit,
identifying port locations and indicat-
ing caution areas.
Safety
The GSSD was designed with protec-
tion of unit components in mind. High
and low pressure cutouts are included
to prolong the life of the compressor.
A 35 degrees F freezestat for non-anti-
freeze applications or 20 degrees F
freezestat for closed loop with anti-
freeze is included to protect against
fluid freezing in the unit’s water heat
exchanger. All safety devices with ex-
ception of compressor internal over-
load are connected to a lockout relay
to turn off the compressor, the loop
pumps and the desuperheater pump if
a problem is incurred.
Note:
The lockout relay may be reset by
cycling power to the unit at the dis-
connect or thermostat system switch.
Brass Loop Water
Connections
Two 1-inch brass swivel connectors
on the units help eliminate the need for
a backup wrench when tightening the
loop water connections.
Gaskets for the brass connections can
be found inside a cloth bag located in
the electrical compartment.
Cabinet
The cabinet is constructed of galva-
nized heavy gauge steel. The finish is
applied by an electrostatic powder
spray system in the color of crushed
ice.
The top, front half of the diagonal cab-
inet is removable for access to all of
the internal components by removing
only two screws. All panels are insu-
lated with 1/2-inch thick, neoprene
backed, acoustical fiberglass insula-
tion
Desuperheater
(Optional)
The double wall vented desuperheater
uses heat off of the discharge line of
the compressor to preheat a home’s
domestic hot water. Hot water is pro-
vided at virtually no cost to the user
during the cooling operation and effi-
ciently during the heating operation by
reducing the amount of time the hot
water heater runs.
The desuperheater’s stainless steel,
voluted, circulator pump is built into
the unit. The connections are 1/2-inch
NPT female water inlet and outlet con-
nections. The desuperheater has two
temperature control sensors that mon-
itor the temperature of the discharge
line of the compressor and the temper-
ature-out of the hot water heater. The
desuperheater is disable until the com-
pressor discharge line reaches 145 de-
grees F. The desuperheater pump will
automatically shut off if the tempera-
ture of the incoming water exceeds
125 degrees F to prevent excessive
water temperatures and pump damage.
Trane provides a twist lock fuse for the
desuperheater. The fuse is shipped
loose to ensure pump integrity. The
pump is water cooled and should be
connected to the water heater prior to
its running.
The fuse is located in a cloth bag in the
electric box. (See Page 12, Figure 6
for fuse location).
Thermostats
The following wall mounted thermo-
stats may be used in conjuction with
these units:
! Single-stage manual changeover
with Heat-Off-Cool system switch
and On-Off fan switch. This
thermostat is suitable if there is no
electric backup heater used with a
water-to-air heat pump.
! A single stage cool/two stage heat
manual changeover with Heat-
Off-Cool system switch, Auto/On
fan switch, and a Normal-
Auxiliary-Emergency Heat switch.
The Normal-Auxiliary-Emergency
Heat switch thermostat is suitable
when an electric backup heater is
used in conjunction with a water-
to-air heat pump.
General Information