Trane WSHP-DS-6 User Manual

WSHP-DS-6

WSHP-DS-6
March 2000

Water Source
Heat Pump

Water-to-Water
Model WPWD

Introduction

The WPWD product is a heating
and cooling hydronic fluid water-to­water heat pump capable of pro­ducing water temperature up to

F or temperatures down to

130
25 F. This extended operating
range offers great opportunities in
commercial, residential and indus­trial applications.

There are many load side applica­tions for which the WPWD is suited.
Typical usages include:

q Hydronic baseboard heating
q Radiant slab heating
q Space heating or cooling with

Trane fan coils

q Ice and snow removal
q High volume water heating (non

potable)

q Boiler replacement (@130

F)

In the heating mode, the water-to­water unit efficiently extracts heat
from a water source (source side)
such as a well, lake, boiler/tower
loop or closed ground loop heat-ex­changer, then transfers the heat to
another flow of water (load side).
The amount of heat added to the
load side is greater than the
amount taken from the source side.
The electrical energy supplied to
the compressor is added to the out­put heat of compression.

The Trane water-to-water product
package includes:

q High efficient scroll compressor
q Compressor protection
q Water to refrigerant condensing

coil

q Freeze protection
q Water to refrigerant evaporator

coil

q Expansion valve
q Filter Drier
q Reversing Valve
q Internal desuperheater

(optional)

©An American Standard Company

2

Table of Contents

Introduction 2
Features and Benefits 4
Model Number Description 7
General Data 8
Application Considerations 9
Electrical Data 18
Performance Data 19
Dimensional Data 25
Wiring Diagram 28
Accessory Options 30
Mechanical Specifications 31

3

Features
and
Benefits

General

General

The water source heat pump model
WPWD (water-to-water) offers a
range of capacities from 2 tons to 6
tons. All units are housed in one
standard compact cabinet.

Cabinet

The cabinet, which allows easy ac­cess for installation and service, is
constructed of heavy gauge metal.
The cabinet finish is produced by a
corrosion resistant electrostatic
powder paint coating in the color
“soft dove”.

The top half of the diagonal cabinet
is removable for access to the inter­nal components by removing two
screws. (See Figure 1).

Figure 1: Unit access

Insulation

To reduce condensation and com­pressor noise, the cabinets are in­sulated with 1/2-inch thick,
neoprene backed, acoustical fiber­glass insulation.

Compressor

The model WPWD contains a high
efficiency scroll compressor for reli­able and efficient operation. The
scroll compressor’s unique design
lends itself to having one of the low­est sound levels in the industry.

The compressor is internally isolat­ed and placed on a stiff base plate
designed to further reduce vibration
noise. As an added benefit, the

WPWD cabinet includes full length
channel stiffeners underneath the
unit.

Heat Exchanger

The water to refrigerant heat ex­changers are made of stainless
steel brazed plate. This design pro­vides a larger amount of surface
area for heat exchange between
the water and the refrigerant. (See
Figure 2 for cut-away).

.

Figure 2: Brazed plate heat ex­changer

Piping

All low-side copper tubing in the re­frigeration circuit is insulated to pre­vent condensation at low entering
liquid temperatures.

Filter Drier

A filter drier is provided in each unit
for dehydration and cleaning of the
refrigeration circuit. This feature
adds to the unit life.

Expansion Valve

As standard, Trane provides a bal­anced port thermal expansion
valve. This valve precisely meters
the refrigerant flow through the cir­cuitry to achieve the desired heat­ing or cooling over a wide range of
fluid temperatures.

Water Connections

All water connections feature
1-inch brass swivel connectors. Be­cause the connectors are swivel, a
back-up wrench is not necessary
when tightening.

4

24 Volt Controls

All electrical controls and safety de­vices are factory wired, tested, and
mounted in the unit. The control
package includes:

and
Benefits

Lockout
Relay

ControlsFeatures

50 VA Transformer

24 VAC Contactor

q Compressor contactor
q 24 Volt transformer
q Lockout relay
q Compressor run capacitor (1-

phase units only)

q Reversing valve coil (For heat

pump only)

q Fuse (for desuperheater)

A terminal strip with 1/4” fork con­nections will be provided for field
thermostat control wiring. (See Fig-
ure 3).

Safety Devices

Each Trane water-to-water unit con­tains safety devices to prevent com­pressor damage. These include:

q Low pressure switch
q High pressure switch
q Temperature sensor (freezestat)
q Internal overload protection

Low Pressure Switch

The low pressure switch prevents
compressor operation under low
charge or in excessive loss of
charge situations. This device is set
to activate at refrigerant pressures

of 35 psig when a 35
ature detection thermostat is ap­plied. An optional 7 psig pressure
switch is available when using a 20
F temperature low temperature de­tection thermostat.

F low temper-

High Pressure Switch

For internal overload protection,
Trane provides a high pressure
switch. This de-energizes the com­pressor when discharge pressure
become excessive.

Compressor
Run Capacitor

High Voltage

Low Voltage

Low Temperature
Detection Thermostat

The low water temperature detec­tion thermostat is provided to pro­tect the water-to-refrigerant heat
exchanger from freezing. This de­vice prevents compressor opera­tion if leaving water temperature is
below 35
perature thermostat may be applied
for low water temperatures where
an appropriate antifreeze solution is
used.

F. An optional 20 F tem-

Figure 4: Typical thermostat termination points

Low Voltage

2 Amp Fuse
(for use with
desuperheater
option)

Thermostat

10 Pole Terminal

Strip

Figure 3: Controls

Lockout Relay

When the safety controls are acti­vated to prevent compressor short
cycling, the lockout relay (circuit)
can be reset at the thermostat, or by
cycling power to the unit.

Thermostat Hook-up

Low voltage and high voltage
knockouts are provided in the top
half of the unit. All control wiring to
the unit should be 24 Volt.

(See Figure 4 for termination
points).

24V Power

Compressor
Reversing Valve

(energized in clg)

Ground

5

Features

Heat
and
Benefits

Desuperheater Option

The desuperheater option is a heat
recovery system packaged within
the water-to-water unit. This option
captures heat energy from the heat
pump for considerable cost savings
all year. Since it is active in either
operating mode, it can provide hot
water at a reduced cost while in
heating or virtually free hot water
while in cooling.

Standard equipment includes:
q Desuperheater (heat

exchanger)

q Circulating pump
q Entering water temperature

detector (125 F stops pump)

q Discharge refrigerant

temperature detector (145 F

starts pump)

q Fuse
q Water heater hook-up kit

Recovery

The unit employs a circulating pump
to move water through a double wall
heat exchanger. It then returns the
heated water to the water tank. This
water is heated by superheated re­frigerant discharge gas from the
compressor. This heat energy can
now be utilized as a cost savings in
water heating.

Circulating Pump

The pump is a circular, single stage
open system pump. Its specifica­tions include:

q 1/25 HP (horsepower)
q 230 Volt / 60 Hertz / 1 phase
q 90 Watts
q .40 Amps
q 2865 rpm (revolutions per

minute)

q 2 MF (microfarad) / 400 Volt

capacitor

The pump contains a minimum fluid
temperature rating of 50 F, a maxi­mum fluid temperature (open sys­tem) of 140 F, and a maximum
working pressure of 145 psi.

Desuper-out

Desuper-in

Isolation
Valves
(by others)

6

from Desuperheater

to Desuperheater

Hot water
(Supply)

Water heater
hook-up kit with
drain valve

Cold water
(Supply)