Trane WSHP-DS-6 User's Manual
Contents
1. O ovo Cc Internal desuperheater optional 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 Features and Benefits 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 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 designed to further reduce vibration no2. 6 The central systems supply and return lines should be sized to handle the required flow with a minimum pressure drop Note Pipe will sweat if low temperature water is run through the supply or return lines Trane recommends that these lines be insulated to pre vent damage from condensa tion 7 The field supplied line voltage disconnect should be installed for branch circuit pro tection The unit is supplied with an opening for attaching conduit General A well water application involves an open loop water supply The water is drawn from an open well or pond into the unit A straining device is required with this application Similar to the closed loop design an open water supply usually remains at a constant temperature year round utilizing maximum efficiency in unit design See Figure 11 for open well water installation Application Considerations 1 Well Water Application Ball valves should be installed in the supply and return lines for unit isolation and unit water flow rate balancing if auto matic flow device is not selected This connection along with hoses are also rec ommended for backflushing and chemical cleaning of the evaporator and the condenser Flexible hoses may be used to connect the water supply and return lines to the water inlets and outlets These hoses reduce possible vibration between the unit and the rigid system Note Hoses and or pipes shoul
3. 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 Figure 7 Open Loop system Figure 8 Cooling tower boiler system 10 Water In Load Side Fluid traveling TO or FROM a mechanical device such as hydronic coil concrete slab or flooring Water Out Load Side Application Source Side Considerations vs Source vs Load The model WPWD water to water system contains two water to refrig erant heat exchangers The two heat exchangers enable the system to be divided into a source and load separation The source side heat exchanger performs as in a standard water to air heat pump system The source is typically supplied through a cooling tower boiler closed loop or open well system During the refrigeration cycle heat is transferred from the Load Side source side heat exchanger to the load side heat exchanger The load side heat exchanger takes the place of a DX direct ex pansion air coil It provides treated fluid hot or cold to a mechanical device These mechanical devices
4. include designs such as radiant slab heating hydronic coils or fresh air ventilation units See Figure 9 for a basic schematic of source side verses load side of a water to water system Water In Source Side Fluid traveling TO or FROM a cooling Refrigeration tower boiler ground Circuit Figure 9 Source Load schematic loop or open well system Water Out Source Side Geothermal Integrated System The Trane ground source heat pump is highly efficient in service station applications This integrated system design takes advantage of the earths relatively constant temperature 45 F to 70 F to space condition the building In addition appliances such as freezers ice makers and a display coolers may be added to the loop for further gains in the reduction of consumed energy Hydronic Ice Melting Via a Water to Water Application Considerations Cold climates may take an even greater advantage of the heat rejected by the stores refrigeration equipment and space conditioning heat pumps This rejected heat may be used by Trane s water to water heat pump s to heat water for a car wash and melt ice off of a driveway allowing the car wash to remain open all winter This integrated system also eliminates thermal short circuiting between the intakes and the exhausts of an air cooled refrigeration system 12 Refrigeration Eguipment Closed Loop Geothermal Geothermal
5. 25 8 28 6 39 45 Max Fuse Size 25 30 40 45 60 70 Aux Pump Amps 2 5 2 5 2 5 2 5 2 5 2 5 Desuperheater Min Cir Ampacity 14 3 18 8 23 25 5 35 40 1 Desuperheater Pump RLA 0 4 0 4 0 4 0 4 0 4 0 4 Voltage 208 230 60hz 3phase Compressor RLA 10 7 11 4 13 9 20 19 3 Compressor LRA 63 77 88 123 137 Minimum Circuit Ampacity 15 16 19 4 28 27 Max Fuse Size 20 25 30 45 40 Aux Pump Amps 2 5 2 5 2 5 2 5 2 5 Desuperheater Min Cir Ampacity 13 4 14 3 17 4 25 24 1 Desuperheater Pump RLA 0 4 0 4 0 4 0 4 0 4 Voltage 460 60hz 3phase Compressor RLA 5 5 7 7A 7 5 10 Compressor LRA 31 39 44 49 5 62 Minimum Circuit Ampacity 7 8 10 10 5 14 Max Fuse Size 15 15 15 15 20 Aux Pump Amps 2 5 2 5 2 5 2 5 2 5 Desuperheater Min Cir Ampacity 6 3 7 1 8 9 9 4 12 5 Desuperheater Pump RLA 0 4 0 4 0 4 0 4 0 4 Voltage 575 60hz 3phase Compressor RLA 6 4 7 8 Compressor LRA i 40 50 Minimum Circuit Ampacity 9 11 Max Fuse Size 15 15 Aux Pump Amps i 2 5 2 5 Desuperheater Min Cir Ampacity 8 9 8 Desuperheater Pump RLA 0 4 0 4 Voltage 265 60hz 1phase Compressor RLA 9 6 14 3 16 4 17 1 Compressor LRA 47 71 83 98 gt 5 Minimum Circuit Ampacity 13 5 20 23 24 gt Max Fuse Size 20 30 35 35 i Aux Pump Amps 2 5 2 5 2 5 2 5 Desuperheater Min Cir Ampacity 12 17 9 20 5 21 4 Desuperheater Pump RLA 0 4 0 4 0 4 0 4 18
6. Controls 50 VA Transformer 24 VAC Contactor Ground 10 Pole Terminal Strip Cr Figure 3 Controls Lockout Relay When the safety controls are acti vated 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 Figure 4 Typical thermostat termination points Features 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 O Desuperheater heat exchanger O Circulating pump O Entering water temperature detector 125 F stops pump O Discharge refrigerant temperature detector 145 F starts pump O Fuse O Water heater hook up kit Isolation Valves by others Desuper out Desuperin4 Heat Recovery The unit employs a circulating pump to move water through a double wall heat exchanger It then r
7. Space Temperature Heating Cooling Closed Ground Loop Heat Exchanger Typical Benefits QO Annual energy savings means lower operational costs UO Takes advantage of the earths constant temperature rather than high fluctuation of ambient temperature Q Heat energy rejected from the space conditioner can be utilized for ice or snow melting of a parking lot in colder climates UO Two to three year estimated payback on installation costs Fresh Air Ventilation with Water to Water Units A p d TI J Water to Water and Fresh Air Ventilation Geothermal energy systems take advantage of the fact that subsurface earth temperatures are constant year round which makes the earth an ideal heat source and heat sink for heat pumps The above design goes further than just space heating and cooling Fresh air ventilation is achieved by using Trane water to water units teamed with a hydronic outside air unit and exhaust air unit to meet total building reguirements In the cooling season the evaporator water from the heat pumps is circulated through a hydronic coil in the makeup air unit to provide cooling and dehumidification The condenser water is used to provide reheat Application Considerations energy to temper the ventilated air in accordance with the building needs After leaving the reheat hydronic coil the condenser water is then returned to the building loop fo
8. WSHP DS 6 l WSHP DS 6 S TRANE March 2000 Water Source Heat Pump Water to Water Model WPWD 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 tions for which the WPWD is suited Typical usages include Q Hydronic baseboard heating O Radiant slab heating O Space heating or cooling with Trane fan coils O Ice and snow removal Q High volume water heating non potable QO Boiler replacement 130 F OAn American Standard Company 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 amount taken from the source side The electrical energy supplied to the compressor is added to the out put heat of compression The Trane water to water product package includes O High efficient scroll compressor QO Compressor protection O Water to refrigerant condensing coil O Freeze protection O Water to refrigerant evaporator coil Expansion valve Filter Drier Reversing Valve
9. d be braided stainless steel and sized suitable for the system s water pressure and flow rate Load side connections are used to supply the terminal device Figure 11 4 Well Water Systems Y ym N BDP w Well water installation The sound attenuation pad should be slightly oversized for the unit This field supplied product is recommended for sound absorption of unit The low voltage control con nection provided on the unit is large enough for attaching con duit The expansion tank should be sized to maintain pressure on the system The line voltage disconnect should be installed for branch circuit protection The unit is supplied with an opening for attaching conduit The water regulating valve assembly is used to maintain refrigerant pressure in refriger ant circuit as the entering water temperature varies or is cooler than ideal Schrader connections are factory installed for ease of attaching the water regulating valve assembly General A distributed pumping system con tains either a single or dual pump module connected directly to the units supply and return source side This design requires individual pump modules specifically sized for each water source heat pump Cen tralized pumping is not required See Figure 12 for a distributed pumping installation Application Considerations Earth Coupled Application 1 Ball valves should be installed in the supply and retu
10. d 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 CO 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 O An 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 aguifer O Water quality must be acceptable with minimal suspended solids To help ensure clean water a straining device may be reguired 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
11. eturns 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 O 1 25 HP horsepower O 230 Volt 60 Hertz 1 phase O 90 Watts O 40 Amps Q 2865 rpm revolutions per minute O 2 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 Cold water Supply Hot water Supply Water heater hook up kit with drain valve Model Number Description WP W D 04210B22100T Digits 1 amp 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 source side 1 Brazed Plate Heat Exchanger with 35 F 1 67 C Freezestat 2 Brazed Plate Heat Exchanger wi
12. hin a basement or mechanical room to fulfill pumping requirements for the entire building system With a central pumping system an auxil iary pump is typically applied to lessen the likelihood of system down time if the main pump mal functions See Figure 10 for unit installation of a central pumping system Application Considerations Central Pumping System Figure 10 Central pumping system installation Central Pump Application 1 Ball valves should be installed in the supply and return lines for unit isolation and unit water flow rate balancing if an auto matic flow device is not selected This connection along with hoses are also rec ommended for backflushing and chemical cleaning of the water to refrigerant heat exchanger 2 Flexible hoses may be used to connect the water supply and return lines to the water inlets and outlets These hoses reduce possible vibration between the unit and the rigid system Note Hoses and or pipes should be made of braided stainless steel and sized suit ably for the systems water pressure and flow rate 3 Load side connections are typically used to supply the ter 15 minal devices with 45 F or 120 F fluid 4 The sound attenuation pad should be slightly oversized for unit This field supplied product is recommended for sound absorption of unit 5 The low voltage control con nection provided on the unit is large enough for attaching con duit
13. ifications at lowest or highest expected source and load EWT entering water temperature O Refer 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 groun
14. ise As an added benefit the 4 General 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 sl 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 24 Volt Controls All electrical controls and safety de vices are factory wired tested and mounted in the unit The control package includes UO Compressor contactor O 24 Volt transformer QO Lockout relay O Compressor run capacitor 1 phase units only O Reversing valve coil For heat pump onl
15. r further heat rejection In heating the water to water units switch to hot water generation The water for ventilation air tempering first circulates through the hydronic coil to the exhaust air unit to pick up heat from the building exhaust airstream The water then circulates through the water to water heat pumps for further heat introduction before being used by 13 Fresh Air Ventilation Water Out V source Water Out Gs load eo Water In gt source WWF Water In load A Closed Ground Loop Heat Exchanger the makeup air unit hydronic coil to heat the makeup air to maintain building requirements This ventilation system incorporates its own constant volume pumps to pull system water off the loop and return it There is no need for additional heat injection using boilers for this system See Page 14 for mechanical example Typical Benefits O Annual energy savings means lower energy costs Building comfort and climate control Application Fresh Air Considerations Ventilation Mechanical OUTSIDE AIR AIR HOT WATER COIL 1 N N An 2 im im cc Su y 7 E5 2 A EXP TANK o cc as E AUTOMATIC o 15 i AIR VENT An at 23 Ae II 2 xO uire Dex ti HAND A PUMP dp DRAIN VA X PRESSURE RELIEF VA BALL VA V L Da General A central pumping system involves a single pump design usually locat ed wit
16. rn lines for unit isolation Flexible hoses may be used to connect the water supply and return lines to the water inlets and outlets These hoses reduce possible vibration between the unit and the rigid system Note Hoses and or pipes should be braided stainless steel and sized suitable for the system s water pressure and flow rate Load side connections are used to supply the terminal device Distributed Pumping System a PN Figure 12 Distibuted pumping installation The sound attenuation pad should be slightly oversized for the unit This field supplied product is recommended for sound absorption of unit The low voltage control con nection provided on the unit is large enough for attaching con duit The ground loop pump mod ule is designed for circulating commercial loops that reguire a maximum flow rate of 20 gpm The line voltage disconnect should be installed for branch circuit protection The unit is supplied with an opening for attaching conduit All polyethene pipe in the closed loop design should be insulated to eliminate the risk of sweating Table E 1 Electrical Data Electrical Data Model WPWD 024 036 042 048 060 072 Voltage 208 230 60hz 1phase Compressor RLA 11 4 15 18 4 20 4 28 32 1 Compressor LRA 56 73 95 109 169 169 Minimum Circuit Ampacity 16 21
17. th 20 F 6 67 C Freezestat Digit 12 Freeze Protection load side 1 Brazed Plate Heat Exchanger 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 C Command Aire General Data Table G 1 Physical Data English Model WPWD 024 036 042 048 060 072 Width of cabinet in 23 23 23 23 23 23 Unit Size 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 ie Weight 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 O Source EWT entering water temperature is at 75 F QO Unit selection should be based upon extended spec
18. y O Fuse 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 O Low pressure switch O High pressure switch O 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 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 Features and Benefits Lockout Relay 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 2 Amp Fuse for use with Thermostat Y aes
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