WSHP-SVX01L-EN 7
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).
Controls
The control system offered to control the unit is a Basic 24V
control for the ½-5 ton and EXH/V070 sizes, a Deluxe 24 V
control option for all unit sizes, a Tracer™ ZN510,
LonTalk™ certified control option for the ½–5 ton and EXH/
V070 unit sizes, or a Tracer ZN524, LonTalk certified control
option for all unit sizes.
All power wiring to the equipment is made at the unit
contactor for ½–5 ton, 1-phase units. For 3-phase units all
power wiring to the equipment is made to the contactor
and power block. For EXH/V070 units all power wiring to
the equipment is made to the power block. For the GEH/V
6-25 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 460 V 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 24 V
control systems may be located in the back of this manual.
All digital control troubleshooting tips and connection
diagrams are located in WSHP-IOP-2 (ZN510) or WSHP-
PRB002-EN (ZN524).
Basic 24 V Controls
Safety devices for equipment containing the basic 24 V
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 3½-minute time delay for compressor control.
Deluxe 24 V 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 Table 59, p. 102 for diagnostic
information and Figure 58, p. 59 and Figure 59, p. 59 for
thermostat connections.
Tracer ZN510 Controls (½–5 Ton and EXH/V070
units)
The digital ZN510 controller is designed to support the ½–
5 ton water-source heat pumps in either a standalone,
peer-to-peer with a Tracer Loop Controller, or as a full
building automation (open protocol) system. The ½–5 ton
units that incorporate direct digital controls will typically
come equipped with the ZN510 control board. The
exception to this would be if the equipment contained hot
gas reheat, waterside economizer, or boilerless control
with electric heat.
Table 1. High/Low pressure switch
Trip Recover Unit
LP 40 +/-4 56 +/-4 psig
HP 650 +/-10 550 +/-10 psig
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