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General information – Trane GSSD User Manual

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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