WSHP-SVX014F-EN
9
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
Recover
Unit
LP
40 +/-4
56 +/-4
psig
HP
650 +/-10
550 +/-10
psig
Controls
The available control type is a Deluxe 24V control
option, a Tracer
®
ZN524, LonTalk
®
certified control
option or a Tracer
®
UC400(B) BACnet
®
control option
for all unit sizes.
All power wiring to the equipment is made at the unit
contactor for 0.5 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 DXH/V070 units all power wiring to the equipment
is made to the power block. All low-voltage wiring is
made at the unit’s low voltage terminal board or
terminal plug. EXH 460V and DXH 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 BAS-SVX20*-EN.
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). .
Tracer
®
®
UC400(B) (option)
The Tracer
®
UC400(B) is a BTL Listed BACnet
®
controller that can operate stand- alone or within a
Building Automation System (BAS) such as Tracer
®
SC
+. For installation, operation, and maintenance, see
BAS-SVX065*-EN.
Tracer
®
®
ZN524 Controls (option)
The digital ZN524 controller is designed to support the
2 to 6 ton water-source heat pumps as a standalone or
full building automation (open protocol) system.
For installation, operation and diagnostics see CNT-
SVX11*-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.
Waterside Economizer (Option)
Instructions for mechanical connection of the waterside
economizer to the water-source heat pump may be
found in the dimensional section of this manual.
The waterside economizer is designed to begin
economizing mode when water temperatures fall
below the field adjustable temperature of 25, 35, 45, 55
or 60°F (for the Deluxe control option), or below the
programmed set-point (for the ZN524 or UC400 control
option).
When the temperature is less than the setpoint, fluid
will flow into the economizing coil, while
simultaneously halting mechanical operation of the
compressor. Mechanical cooling will continue on a call
for a second stage from the thermostat or system
control. Entering water temperature sensor is factory
