General Information - Trane GEHE 072-180 Installation, Operation And Maintenance Manual

General Information

Unit Description
Before shipment, each unit is leak tested, dehydrated,
charged with refrigerant and run tested for proper control
operation.
Air-to-Refrigerant Coil
The air-to-refrigerant coil is aluminum fin, mechanically
bonded to the copper tubing.
Water-to-Refrigerant Coil
The water-to-refrigerant coil is a copper or cupro-nickel
(option) and steel tube (tube-within-a-tube) design, leak
tested to assure there is no cross leakage between the
water tube (copper/cupro-nickel) and refrigerant gas (steel
tube).
Table 1. High/Low pressure switch
Trip
LP 40 +/-4
HP 650 +/-10
Controls
Basic 24V control is available for the GEH/V .5 -5 ton
models and the Deluxe 24V control option is available for
all unit sizes.Tracer® ZN524, LonTalk® certified control
option is available for all unit sizes. UC400 and UC400 with
wireless comm BACnet® is available in all unit sizes.
All power wiring to the equipment is made at the unit
contactor for .5 to 5 ton, 1-phase units. For 3-phase units all
power wiring to the equipment is made to the contactor or
power block. For EXH/V070 units all power wiring to the
equipment is made to the power block. For the GEH/V 6 to
25 tons units all power wiring is made to the high voltage
terminal block. All low-voltage wiring is made at the unit's
low voltage terminal board. EXH and EXV 460V units
require a neutral wire.
System Input Devices and Functions
A thermostat, zone sensor, or building automation system
is required to operate the water-source heat pump.The
flexibility of having several mode capabilities depends
upon the type of sensor and/or remote panel selected.
Troubleshooting and connection diagrams for the 24V
control systems may be located in the back of this manual.
All digital control troubleshooting tips and connection
diagrams are located in CNT-SVX11*-EN (ZN524). All
digital control troubleshooting tips and connection
diagrams are located in BAS-SVX065*-EN (UC400).
8
Recover Unit
56 +/-4 psig
550 +/-10 psig
Basic 24V Controls
Safety devices for equipment containing the basic 24V
control option include a low-pressure switch to prevent
compressor operation during low temperature or low
suction activity.The switch is set to activate at refrigerant
pressure of 40 psig to fit most applications.
A high pressure switch prevents compressor operation
during high or excessive discharge pressures exceeding
650 psig.
The lockout relay will disable the compressor on a high or
low pressure condition. For units that contain a
condensate overflow switch option, a condensate
overflow condition will also disable the compressor
through the lockout relay.The relay may be reset at the
thermostat, or by cycling power to the unit.
General alarm is accomplished through the lockout relay.
This feature will drive dry contacts only, and cannot be
used to drive field installed control inputs.Trane provides
a 3.5-minute time delay for compressor control.
Deluxe 24V Controls (option)
Units containing the Deluxe 24V control design will
incorporate a microprocessor-based control board.The
Trane® microprocessor board is factory wired to a
terminal strip to provide all necessary terminals for field
connection.The deluxe board is equipped with a random
start relay, anti-short cycle timer, brown out protection,
compressor disable, condensate overflow, unit safety
control, diagnostics, and a generic relay (which may be
available for field use). See
information and Figure 59, p. 62
thermostat connections.
Tracer® UC400 (option)
TheTracer® UC400 is a BTL Listed BACnet® controller that
can operate stand- alone or within a Building Automations
system such asTracer® SC. For installation, operation and
Programming, see BAS-SVX065*-EN (UC400).
Tracer® ZN524 Controls (option)
The digital ZN524 controller is designed to support the .5
to 25 ton water-source heat pumps in either a standalone,
or as a full building automation (open protocol) system.
For installation, operation and diagnostics see CNT-
SVX11A-EN (ZN524).
Pump Module (field installed accessory)
The pump module shall consist of either a single or dual 1/
6 HP bronze pump and a brass three-way shut-off valve.
Cast iron pumps are also available.The pump module kits
shall contain the necessary components for the
installation, operation and maintenance of the water
circuit of a closed-loop distributed pumping application.
Table 64, p. 113 for diagnostic
and Figure 60, p. 63
WSHP-SVX01Q-EN
for