Trane WSHP-DS-6 User manual

WSHP-DS-6

March 2000

Water Source

Heat Pump

Water-to-Water

Model WPWD

WSHP-DS-6

Introduction

The WPWD product is a heating

and cooling hydronic fluid water-to-

water heat pump capable of pro-

ducing water temperature up to

130 F or temperatures down to

25 F. This extended operating

range offers great opportunities in

commercial, residential and indus-

trial applications.

There are many load side applica-

tionsforwhichtheWPWDissuited.

Typical usages include:

qHydronic baseboard heating

qRadiant slab heating

qSpace heating or cooling with

Trane fan coils

qIce and snow removal

qHighvolumewaterheating(non

potable)

qBoiler replacement (@130 F)

In the heating mode, the water-to-

water unit efficiently extracts heat

from a water source (source side)

such as a well, lake, boiler/tower

loop or closed ground loop heat-ex-

changer, then transfers the heat to

another flow of water (load side).

The amount of heat added to the

load side is greater than the

amounttakenfromthesourceside.

The electrical energy supplied to

the compressor is added to the out-

put heat of compression.

The Trane water-to-water product

package includes:

qHigh efficient scroll compressor

qCompressor protection

qWatertorefrigerantcondensing

coil

qFreeze protection

qWater to refrigerant evaporator

coil

qExpansion valve

qFilter Drier

qReversing Valve

qInternal desuperheater

(optional)

©An American Standard Company

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

Table

Contents

General

Thewater sourceheatpump 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 ac-

cess 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 inter-

nal components by removing two

screws. (See Figure 1).

Figure 1: Unit access

Insulation

To reduce condensation and com-

pressor noise, the cabinets are in-

sulated with 1/2-inch thick,

neoprene backed, acoustical fiber-

glass insulation.

Compressor

The model WPWD contains a high

efficiency scroll compressor for reli-

able and efficient operation. The

scroll compressor’s unique design

lends itself to having one of the low-

est sound levels in the industry.

The compressor is internally isolat-

ed and placed on a stiff base plate

designedtofurtherreducevibration

noise. As an added benefit, the

WPWD cabinet includes full length

channel stiffeners underneath the

unit.

Heat Exchanger

The water to refrigerant heat ex-

changers are made of stainless

steel brazed plate. This design pro-

vides 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 ex-

changer

Piping

All low-side copper tubing in the re-

frigeration circuit is insulated to pre-

vent 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 bal-

anced port thermal expansion

valve. This valve precisely meters

the refrigerant flow through the cir-

cuitry to achieve the desired heat-

ing or cooling over a wide range of

fluid temperatures.

Water Connections

All water connections feature

1-inch brass swivel connectors. Be-

cause the connectors are swivel, a

back-up wrench is not necessary

when tightening.

General

Features

and

Benefits

ControlsFeatures

and

Benefits

Lockout

Relay 50 VA Transformer

24 VAC Contactor

Compressor

Run Capacitor

2 Amp Fuse

(for use with

desuperheater

option)

Ground

10 Pole Terminal

Strip

Low Voltage

Thermostat

Low Voltage

High Voltage

Figure 3: Controls

24 Volt Controls

All electrical controls and safety de-

vices are factory wired, tested, and

mounted in the unit. The control

package includes:

qCompressor contactor

q24 Volt transformer

qLockout relay

qCompressor run capacitor (1-

phase units only)

qReversing valve coil (For heat

pump only)

qFuse (for desuperheater)

A terminal strip with 1/4”fork con-

nections will be provided for field

thermostat control wiring. (See Fig-

ure 3).

Safety Devices

Each Trane water-to-water unit con-

tains safety devices to prevent com-

pressor damage. These include:

qLow pressure switch

qHigh pressure switch

qTemperature sensor (freezestat)

qInternal 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 F low temper-

ature detection thermostat is ap-

plied. An optional 7 psig pressure

switch is available when using a 20

F temperature low temperature de-

tection thermostat.

High Pressure Switch

For internal overload protection,

Trane provides a high pressure

switch. This de-energizes the com-

pressor when discharge pressure

become excessive.

Low Temperature

Detection Thermostat

The low water temperature detec-

tion thermostat is provided to pro-

tect the water-to-refrigerant heat

exchanger from freezing. This de-

vice prevents compressor opera-

tion if leaving water temperature is

below 35 F. An optional 20 F tem-

perature thermostat may be applied

for low water temperatures where

an appropriate antifreeze solution is

used.

Lockout Relay

When the safety controls are acti-

vated to prevent compressor short

cycling, the lockout relay (circuit)

canberesetatthethermostat,orby

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)

Figure 4: Typical thermostat termination points

Cold water

(Supply)

Hot water

(Supply)

Water heater

hook-up kit with

drain valve

from Desuperheater

to Desuperheater

Desuper-out

Isolation

Valves

(by others)

Desuper-in

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:

qDesuperheater (heat

exchanger)

qCirculating pump

qEntering water temperature

detector (125 F stops pump)

qDischarge refrigerant

temperature detector (145 F

starts pump)

qFuse

qWater heater hook-up kit

Theunitemploys acirculatingpump

tomovewaterthroughadoublewall

heat exchanger. It then returns the

heated water to the water tank. This

water is heated by superheated re-

frigerant 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 specifica-

tions include:

q1/25 HP (horsepower)

q230 Volt / 60 Hertz / 1 phase

q90 Watts

q.40 Amps

q2865 rpm (revolutions per

minute)

q2 MF (microfarad) / 400 Volt

capacitor

The pump contains a minimum fluid

temperature rating of 50 F, a maxi-

mum fluid temperature (open sys-

tem) of 140 F, and a maximum

working pressure of 145 psi.

Heat

Recovery

Features

and

Benefits

Model Number

Description

Digits 1 & 2: Product Type

WP = Trane Commercial Water

Source Heat Pump

Digit 3: Product Configuration

W = Water-to-Water

Digit 4: Development Sequence D

Digits 5-7: Unit Nominal Capacity

024 = 24.0 MBh

036 = 36.0 MBh

042 = 42.0 MBh

048 = 48.0 MBh

060 = 60.0 MBh

072 = 72.0 MBh

Digit 8: Voltage / Hertz / Phase

1 = 208-230/60/1

3 = 208-230/60/3

4 = 460/60/3

5 = 575/60/3

6 = 220-240/50/1

7 = 265/60/1

9 = 380-415/50/3

Digit 9: Unit Arrangement

0 = Water-to-Water

Digit 10: Design Sequence C

Digit 11: Freeze Protection

1 = Brazed Plate Heat Exchanger

(source side)

with 35 F (1.67 C) Freezestat

2 = Brazed Plate Heat Exchanger

with 20 F (-6.67 C) Freezestat

Digit 12: Freeze Protection

1 = Brazed Plate Heat Exchanger

(load side)

with 35 F (1.67 C) Freezestat

2 = Brazed Plate Heat Exchanger

with 20 F (-6.67 C) Freezestat

Digit 13: Desuperheater Option

0 = No Desuperheater

1 = With Desuperheater

Digit 14: Open

0 = Open Digit

Digit 15: Open

0 = Open Digit

Digit 16: Sticker Option

T = Trane

1 5 10 15

C = Command-Aire

General

Data

Table G-1: Physical Data (English)

Model: WPWD 024 036 042 048 060 072

Unit Size

Width of cabinet (in) 23 23 23 23 23 23

Width of cabinet and connections (in) 24.8 24.8 24.8 24.8 24.8 24.8

Height (in) 24.3 24.3 24.3 24.3 24.3 24.3

Depth (in) 23.3 23.3 23.3 23.3 23.3 23.3

Compressor Type Scroll Scroll Scroll Scroll Scroll Scroll

R-22 Refrigerant (lbs) 3.25 3.375 3.50 4.00 4.25 4.25

Approximate Weight

(lbs) With crate (lbs) 163 183 203 214 244 277

Table G-2: Specifications (English)

Model: WPWD 024 036 042 048 060 072

Source and Load GPM 4.0 6.0 7.0 7.50 10 10

Source and Load Ft. Hd. 1.4 3.2 4.4 5.0 9.2 9.2

Cooling Load EWT 45 F (MBH) 18.24 26.74 31.3 35.55 45.98 51.01

Cooling Load EWT 45 F (EER) 15.0 15.7 15.7 15.4 15.5 14.9

Heating Load EWT 100 F (MBH) 25.38 33.34 39.69 42.87 57.15 67.47

Heating Load EWT 100 F (COP) 3.64 3.62 3.7 3.45 3.62 3.62

Note:

qSource EWT (entering water temperature) is at 75 F

qUnit selection should be based upon extended specifications at lowest or highest expected source and load

EWT (entering water temperature)

qRefer to pages 19-25 for extended performance tables.

Application

Considerations

Closed Loop System

Closed loop systems (both ground source

and surface water) provide heat rejection

and heat addition to maintain proper water

source temperatures.

Operating and maintenace cost are low

because an auxillary fossil fuel boiler and

cooling tower are not required to maintain

the loop temperature. The technology has

advanced to the point where many electric

utilities and rural electric cooperatives are

offering incentives for the installation of

geothermal systems. These incentives are

offered because of savings to the utilities

due to reduced peak loads that flatten out

the system demand curve over time.

For ground source geothermal systems,

(See Figure 5), when building cooling

requirements cause loop water

temperatures to rise, heat is dissapated into

the cooler earth through buried polyethylene

pipe heat exchangers. If reversed, heating

demands cause the loop temperature to fall,

enabling the earth to add heat to meet load

requirements.

Where local building codes require water

retention ponds for short term storage of

surface run-off, a ground source surface

water system, (See Figure 6), can be very

cost effective. This system has all the

advantages as the geothermal system in

cooling dominated structures.

Another benefit of the ground source system

is that it is environmentally friendly. The loop

is made of chemically inert, non-polluting

polyethylene pipe. The heat pumps use

HCFC-22 refrigerant, which has a lower

ozone depletion potential than CFC-12.

Because the closed loop system does not

require a heat adder, there are no CO2

emissions. Less electric power consumed

reduces secondary emissions from the

power plant. Therefore, the system offers

advantages not seen by other central

furnace or heat pump systems.

Figure 5: Ground source geothermal system

Figure 6: Ground source surface water system

Application

Considerations

Open Loop System

Where an existing or proposed well can

provide an ample supply of suitable quality

water, ground water systems may be very

efficient. (See Figure 7)

Operation and benefits are similar to those

for closed loop systems. There are however

several considerations that should be

addressed prior to installation.

qAn acceptable way to discharge the

significant volume of used water from

the heat pump should be defined. It may

be necessary to install a recharge well to

return the water to the aquifer.

qWater quality must be acceptable, with

minimal suspended solids. To help

ensure clean water, a straining device

may be required.

Figure 7: Open Loop system

Figure 8: Cooling tower/boiler system

Cooling Tower/Boiler System

A cooling tower/boiler system (see Figure 8)

utilizes a closed heat recovery loop along

with multiple water source heat pumps in a

more conventional manner.

Typically, a boiler is employed to maintain

closed loop temperatures above 60 F and a

cooling tower to maintain closed loop

temperature below 90 F. All the units

function independantly, either by adding

heat, or removing heat from the closed

water loop, making this system more

efficient than air cooled systems.

The cooling tower/boiler system provides a

low installation cost to the owner than other

systems. A good selection for large building

design needs.

This manual suits for next models

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