Trane WSHP-DS-6 User manual

WSHP-DS-6
March 2000
Water Source
Heat Pump
Water-to-Water
Model WPWD
WSHP-DS-6

2
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

3
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
of
Contents

4
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

5
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

6
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

7
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

8
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.

9
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

10
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.