Trane GSSD User's Manual
Contents
1. Open Digit DIGIT 13 DESUPERHEATER 0 No Desuperheater 1 With Desuperheater DIGIT 14 FREEZE PROTEC TION 1 35 Degree Freezestat 2 20 Degree Freezestat DIGIT 15 OPEN 0 Open DIGIT 16 BRAND C Command Aire T Trane The GSSD split unit has been ARI rat ed with the Trane TWE air handlers with ICM 2 variable speed motors to create a complete split system for res idential applications The GSSD equipment is completely assembled piped internally wired and test operat ed in the factory The GSSD equip ment is ETL and CSA listed A prewired terminal strip is provided for field control wiring The system water inlet and outlet con nections are female 1 inch National Pipe Thread NPT swivel quick con nectors with stainless steel stop ring to simplify field installation The GSSD units are shipped with a pressurized dry nitrogen holding charge to ensure clean components equipment has easy to read decals and labels to aid in service of unit identifying port locations and indicat ing caution areas Safety The GSSD was designed with protec tion ofunit components in mind High and low pressure cutouts are included to prolong the life of the compressor A 35 degrees F freezestat for non anti freeze applications or 20 degrees F freezestat for closed loop with anti freeze is included to protect against fluid freezing in the unit s water heat exchanger safety devices with ex2. maintenance Figure 2 Unit access Desuperheater Water in 1 2 Female NPT Water out 5 1 Female Water in Desuperheater 1 Female Water out 1 2 Female Figure 3 Water hook up locations Liquid Line 1 2 O D Hm Suction Unit Size Line O D 024 3 4 030 072 7 8 Figure 4 Liquid and suction lines 10 Field Wiring Connections Power wiring to the unit should be in stalled per local electric codes by a professional electrician The wires can be run to the unit through the available knockouts and to the control box in the top half of the unit Control wiring to the unit is 24 volt The termination point identifications for the terminal strip is identified per Figure 5 5 Compressor 6 Reversing valve energized in cooling Common Low Voltage NA Pump Control Installation Electrical T Stat X13510588020 Manual changeover two stage heat one stage cool TWE Sizes 031 065 GSSD Sizes 024 072 11 GSSD 24V Field Wiring amp 3 0 Figure 5 Field wire connections 1K1 to Water Pump 11 12 Terminal Strip for Low Voltage to TWE Ground Electrical System The factory tested and installed control box contains all of the necessary de vices to control unit operation in both the heating and cooling mode A re mote wal
3. LO PSI SCHRADER Een 5 990 Zs nm Tr D e vr P V 4 lt 8 7 16 gt 24 13 16 gt WATER IN 1 FRONT VIEW SIDE VIEW Installation Water Connections Location Consideration Unit should be placed on a level surface in a indoor protected area Units should not be installed or stored in an exterior environment There should be approximately 2 to 3 feet of clearance available for accessing the unit for service Accessiblity into unit is made by re moving 2 two screws at the base of the system See Figure 2 The top half of the cube then lifts off Water Connections The loop water connections brought to the unit should be 1 inch male national pipe threads The desuperheater optional connec tions should be 1 2 inch male national pipe threads See Figure 3 for water hook up loca tions Refrigeration Connections The refrigeration piping connections are copper stub outs refrigeration connections are to be soldered into the unit It may be necessary to provide an adapter to connect to the chosen air handler See Figure 4 for location and sizes Note All refrigeration piping between the air handler and the heat pump should be ade quately insulated Water piping should also be insulated to reduce heat transfer and the forming of condensation Remove these two screws for internal unit
4. turer against any defects in material and factory workmanship for one year after installation labor and parts General Information The refrigerant circuit including the compressor expansion device revers ing valve less solenoid coil and all heat exchangers in contact with refrig erants are warranted for an additional four years parts only Optional extended warranties are available through the local distributor Note If any safety device is bypassed or removed the warranty is voided The GSSD is packaged in clear stretch wrap to allow immediate visual in spection A careful inspection should be made for shipping damage or ders are free on board FOB facto ry therefore claims must be made with the delivering carrier Carefully remove the stretch wrap and the top cardboard corner pieces Also Figure 1 Shipment Packaging Receiving and Handling remove the 4 four shipping brackets e Inspect the overall quality and from the lower corners of the unit appearance of the unit along with the shipping skid Note Before installing the unit e Verify nameplate and model number are correct lt gt 2 T Wooden Skid Shipping Brackets Installation Location Considerations Unit Size 024 Ems Unit Weight Unit Size Ibs 024 163 23 5 16 23 O sl LOW VOLTAGE 1 1 8 DIA 5 1 2 K TOP V
5. ALTERNATE 2 COMPRESSOR CIRCUITRY OR AVAILABLE SALES OPTIONS SOLID LINES INDICATE FACTORY WIRING 45 FREEZE PROTECTION SW 1 4S3 HIGH PRESSURE SW BEFORE INSTALLING FUSE IN DESUPERHEATER CIRCUIT BE LOW PRESSURE SW 4 CERTAIN PUMP PIPING IS CONNECTED AND FILLED WITH 4S5 DISCHARGE LINE T STAT WATER 4S6 ENTERING WATER T STAT 5 1 2 3 FUSE 6B DESUPERHEATER PUMP 14 Loop Water Applications It should be noted that there is no me chanical difference between geother mal closed loop and ground water open loop GSSD units Generally in a closed loop application there is a percentage of antifreeze in the water In these applications the 20 degree F freezestat along with the 7 psig safety pressure switch may be used other applications require the 35 degree F freezestat along with the 35 psig safe ty pressure switch Ground Water Applications Open Loop Where an existing or proposed well can provide an ample supply of suit able quality water open ground water systems may be very efficient How ever there are several potential con siderations that should be addressed prior to installation of an open loop system A 60 mesh straining device must be placed in the incoming water line The sand filter separator helps ensure clean water by removing any particles in the water Note A filter separator should be available from your local dealer Even if plenty of water is available
6. be used where low flow and low or high fluid temperature conditions could occur This option is beneficial with open loop systems but not necessary Motorized Water Valve for open loop systems The motorized water valve is installed on the return line of the system between the loop Miscellaneous Equipment and the loop pump module This isolation device is a much less expensive and very effective alternative When the compressor begins running the valve will open allowing water to flow through the unit As the compressor shuts down the valve slowly closes off The main purpose of the automatic device 1s to prevent water hammer by keeping the pressure raised in the loop system during off cycles Electric Strip Heaters If the ETL listed strip heaters are used they can be installed directly inside the TWE air handler These heaters are rated at 230 volts and provide electric heat for both supplemental and emergency heat requirements There are a number of heater capacities available Pump Module The pump module and the hose kit make a complete self contained pumping package for the earth coupled heat pump system These kits contain all the 18 necessary components for the installation operation and maintenance ofthe water circuit of a closed loop geothermal application Standard pump module features include insulated Grundfos pumps insulated cabinet optional cast iron or bronze pumps 3 way brass
7. heat exchanger has a working pressure rating of 450 psig on both the refrigerant and water sides To help ensure clean water for the water to refrigerant heat exchanger Trane recommends a sand filter separator for open loop systems Freezestat and Lock out Relay A freezestat is included to protect the unit from unusually cold loop fluid temperatures or no fluid flow conditions A 35 degree F freezestat is necessary in open Refrigeration System loop applications and closed loop applications without adequate antifreeze A 20 degree F freezestat may be used with closed loop applications with antifreeze solution only A lockout relay circuit consisting of three safety devices low pressure high pressure and Freezestat will trigger the lockout relay to shut off the compressor the loop pumps and the desuperheater pump optional when a safety is tripped A triggered lock out relay is a key indication that there is a problem in the system and service may be necessary The safety that caused the lockout relay to energize will reset itself after approximately five minutes If the lockout relay is manually reset by power interruption prior to this five minute period the unit will be unable to run To manually reset the lockout relay the disconnect or system switch at the thermostat must be toggled Reversing Valve The reversing valve is a pilot operated sliding piston type with replaceable encapsulated magnetic coil T
8. required MORE IS NOT BETTER Do no exceed the amount indicated in the design specifi cations Table 3 Water Volume Volume in Gallons 100 Ft Pipe Size 3 4 1 11 4 11 2 2 Volume SDR 11 3 02 4 73 7 52 9 85 15 4 Volume SCH 40 2 77 4 49 7 77 10 6 17 4 Use only FULL STRENGTH INHIB ITED PROPYLENE GLYCOL OR METHANOL not solutions which have already been diluted Note The water quality of the fluid loop should meet the same specifications as in Table 2 GSSD Units Coupled with TWE Air Handlers The GSSD IS coupled with the TWE E series Table 4 may be used to deter mine the amount of charge necessary for the split unit system without any refrigerant line connecting the two Table 5 can be used to determine the amount of refrigerant needed for lines By adding the two weights together the approximate total system charge can be obtained For fine tuning the charge see Units Coupled with Non TWE Air Handlers and Fine Tuning in next section Table 4 R22 Requirements GSSD TWE Lbs of R22 Model Model for both Number Number GSSD amp TWE GSSD024 TWEO31E 5 0 GSSD030 TWEOSIE 5 0 GSSD036 TWEO040E 8 25 GSSD042 TWEO40E 9 25 GSSD048 TWEO65E 9 25 GSSD060 TWE065E 10 125 GSSD072 TWE065E 10 75 Refrigerant Charge Table 5 R22 requirement per foot of line O D Tube Liquid Line Suction Size
9. valves and the choice of a one or two pump module Hose Kits The hose kits include two brass 1 inch male pipe thread MPT by barb fittings two brass 90 degree 1 inch MPT by barb elbows with pressure temperature ports and 10 feet of rubber hose with 4 hose clamps Sand Filter Separator sand filter separator helps ensure clean water for the water to refrigerant heat exchanger The recommended strainer is 60 mesh or greater The strainer keeps particles and debris from entering the system
10. 2 inch NPT female water inlet and outlet con nections The desuperheater has two temperature control sensors that mon itor the temperature of the discharge line of the compressor and the temper ature out of the hot water heater The desuperheater is disable until the com pressor discharge line reaches 145 de grees F The desuperheater pump will automatically shut off if the tempera ture of the incoming water exceeds 125 degrees F to prevent excessive water temperatures and pump damage Trane provides a twist lock fuse for the desuperheater The fuse 1s shipped loose to ensure pump integrity The pump is water cooled and should be connected to the water heater prior to its running The fuse is located in a cloth bag in the electric box See Page 12 Figure 6 for fuse location Thermostats The following wall mounted thermo stats may be used in conjuction with these units Single stage manual changeover with Heat Off Cool system switch and On Off fan switch This thermostat is suitable if there is no electric backup heater used with a water to air heat pump UO A single stage cool two stage heat manual changeover with Heat Off Cool system switch Auto On fan switch and a Normal Auxiliary Emergency Heat switch The Normal Auxiliary Emergency Heat switch thermostat is suitable when an electric backup heater is used in conjunction with a water to air heat pump Warranty The unit 18 warranted by the manufac
11. EGREE F FREEZESTAT FILTER DRIER EXPANSION VALVE LIQUID LINE WATER OUT SUCTION DISCH LINE 252 SM 9 WATER IN DESUPERHEATER OUT DESUPERHEATER IN REVERSING VALVE Typical Wiring Diagram A WARNING HAZARDOUS VOLTAGE DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING i ERA I M VICI U 230 V BA MAX SEVERE PERSONAL INJURY OR DEATH TO WATERSOURCE PUMP IMPORTANT p USE COPPER CONDUCTORS ONLY TO PREVENT EQUIPMENT DAMAGE UNIT TERMINALS ARE NOT DESIGNED 2 TO ACCEPT ANY OTHER WIRING 5 5 2 EE qr 6E 2 6p 455 6G 456 6H l DESUPER l HEATER PUMP 6 1 G 1TB3 1 EG e gt 4 gt 1TB3 5 185 1TB3 2 5 C2nCI A C DF 1K3 24 18 ITB3 7 1 3 8 1K1 12 14 1TB3 6 A 484 z A _ 25 CEGEND NOTES 1 UNLESS OTHERWISE NOTED ALL SWITCHES ARE DEVICE DESCRIPTION SHOWN AT 77 DEGREES F AT ATMOSPHERIC PRESSURE AT 50 RELATIVE HUMIDITY WITH COMPRESSOR CONTACTOR ALL UTILITIES TURNED OFF AND AFTER A 1K3 LOCKOUT RELAY NORMAL SHUTDOWN HAS OCCURRED 2 DASHED LINES INDICATE RECOMMENDED FIELD WIRING BY OTHERS DASHED LINE ENCLOSURES AND OR DASHED DEVICE OUTLINES INDICATE 1TB3 ERMINAL STRIP COMPONENTS PROVIDED BY THE FIELD DOT COMPRESSOR RUN CAPACITOR LINE ENCLOSURES INDICATE
12. IEW 3 15 16 PUMP CONTROL d e lt 1 7 16 _ WATER REG HI VOLTAGE SCHRADER PORT SUCTION DISCH 1 1 8 DIA 3 4 O D LIQUID LINE 1 2 O D DESUPER OU 1 2 NPT DESUPER I 24 5 16 1 2 NPT LOW PSI SCHRADE 4 oJ org 1T M i PU lt 8 7 16 24 2 gt 13 1 4 N WATER IN 1 NPTI FRONT VIEW SIDE VIEW Installation Location Considerations Unit Size 030 042 Unit Size gr e s 030 169 036 183 042 203 23 5 16 PEE LOWVOLTAGE QUT 1 1 8 DIA P 5 1 2 K TOP VIEW e ie Di s 16 WATER REG HI VOLTAGE SCHRADER PORT SUCTION DISCH 1 1 8 DIA DESUPER OU LIQUID LINE 1 2 NPT 1 2 O D DESUPER 24 5 1 6 1 2 NPT LO PSI SCHRADER 57 s Ua E m i FM 87 16 24 13 16 gt ERU EN WATER IN 1 NPTI FRONT VIEW SIDE VIEW Installation Location Considerations Unit Size 048 072 Unit Size a ere 048 214 060 244 072 277 23 5 16 23 4 6 7 16 lt LOW VOLTAGE T 1 1 8 DIA 21916 VIEW 1 76 PUMP CONTROL HI VOLTAGE 1 1 8 DIA 1 1 8 DIA WATER REG LIQUID LINE SCHRADER PORT SUCTION DISCH 1 2 O D WATER OUT DESUPER OU 1 2 NPT DESUPER 24 516 1 2 NPT
13. Installation Operation amp Maintenance WSHPC IOM 2 72 9041 02 Library Service Literature Product Section Unitary Product Water Source Heat Pump Model GSSD Literature Type Installation Operation and Maintenance Water Source Heat Pump Residential Split Configuration HVAC System An American Standard Company Sequence 2 Date June 1999 File No SL UN WSHP GSSD IOM 2 6 99 Supersedes WSHPC IOM 2 72 9041 01 Jan 98 Since American Standard Inc has a policy of continuous product improvement it reserves the right to change specifications and design without notice The installation and servicing of the equipment referred in this booklet should be done by qualified experienced technicians Table of Contents Model Number Descriptions General Refri tion Ch 16 Information ikea cate ae Receiving and T Handling 22 7 Accessories 18 Installation Water 10 Installation 1 Electrical Diagram 14 Notice The Trane Company urges that all HVAC servicemen working on Trane equipment or any manufacturer s products make every effort to eliminate if possible or vigorously reduce the emission of CFC HCFC and HFC refrigerants to the atmo sphere resulting from installation op
14. ception of compressor internal over load are connected to a lockout relay to turn off the compressor the loop pumps and the desuperheater pump if a problem is incurred Note The lockout relay may be reset by cycling power to the unit at the dis connect or thermostat system switch General Information Brass Loop Water Connections Two 1 brass swivel connectors on the units help eliminate the need for a backup wrench when tightening the loop water connections Gaskets for the brass connections can be found inside a cloth bag located in the electrical compartment Cabinet The cabinet is constructed of galva nized heavy gauge steel The finish is applied by an electrostatic powder spray system in the color of crushed ice The top front half of the diagonal cab inet is removable for access to all of the internal components by removing only two screws panels are insu lated with 1 2 inch thick neoprene backed acoustical fiberglass insula tion Desuperheater Optional The double wall vented desuperheater uses heat off of the discharge line of the compressor to preheat a home s domestic hot water Hot water is pro vided at virtually no cost to the user during the cooling operation and effi ciently during the heating operation by reducing the amount of time the hot water heater runs The desuperheater s stainless steel voluted circulator pump is built into the unit The connections are 1
15. ct the compressor against exces sive refrigeration pressure The low pressure switch should be wired in ac cordance with the type of freezestat that is used Trane factory supplies two low pressure switches in the re frigerant circuit The electrical con nection 1s dependant upon which freezestat 35 or 20 degree 1s selected The pressure switch is used to protect the compressor against operation un HEAT EXCHANGER D 7 PSIG LOW PRESSURE SWITCH USED FOR 20 DEGREE FREEZESTAT DESUPERHEATER COMPRESSOR DESUPERHEATER PUMP Installation Electrical der low charge or catastrophic loss of charge situations The low water temperature switch is provided to protect the water to re frigerant heat exchanger from freez ing This device triggers the lock out relay when leaving water temperatures fall below the preset freezestat setting This device may be reset by cycling power but the system should be re viewed for operational error Important Notice 13 35 PSIG LOW PRESSURE SWITCH USED FOR 35 DEGREE FREEZESTAT The low pressure switch should be wired to activate at refrigerant pressures of 35 psig when a 35 degree F freezestat is used 7 psig when a 20 degree F freezestat is used The installer should verify that the correct freezestat and low pressure switch are used in your application Misapplication can produce a failure to the unit and cause the warranty to be voided 35 DEGREE F OR 20 D
16. eration routine maintenance or major service on this equipment Always act in a re sponsible manner to conserve refrigerants for continued use even when acceptable alternatives are available Refrigerant used in any type of air conditioning or refrigerating equipment should be covered for reuse recovered and or recycled for reuse reprocessed reclaimed or properly destroyed whenever it is removed from the equipment Never re lease to the atmosphere Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges hos es vacuum pumps and recycling equipment Stay aware of unit enhancements conversion refrigerants compatible parts and manufacturer s recommendations which will reduce refrigerant emissions and increase equipment operating efficien cies Follow specific manufacturer s guidelines for conversion of existing systems Model Number Description GSSD03610C00120T 5 10 15 DIGITS 1 amp 2 PRODUCT TYPE GS Ground Source Heat Pump DIGIT 3 PRODUCT CONFIGU RATION S Split System DIGIT 4 DEVELOPMENT SE QUENCE D DIGITS 5 6 amp 7 UNIT NOMINAL CAPACITY MBH 024 24 1 030 29 6 036 36 4 042 41 1 048 48 7 060 59 2 072 65 6 DIGIT 8 VOLTAGE HERTZ PHASE 1 208 230 60 1 DIGIT 9 UNIT ARRANGEMENT 0 Split Condensing Unit DIGIT 10 DESIGN SEQUENCE C DIGIT 11 OPEN DIGIT 0 Open Digit DIGIT 12 OPEN DIGIT 0
17. he reversing valve is energized when 17 the unit is in the cooling mode and de energizes in the heating mode Refrigerant Tubing All refrigerant tubing is constructed of copper The low temperature refrigerant lines are factory insulated with a 3 8 inch thick elastomeric insulation UL 94V 5 rated with a flame spread rating of less than 25 and smoke density rating of less than 50 It has been tested in accordance with ASTM 85 Refrigerant Metering The refrigeration circuit is provided with a bi directional thermal expansion valve to allow operation with entering water temperatures from 25 degrees F to 120 degrees F Liquid Line Filter The unit contains a bi directional liquid line filter drier to remove any contaminants within the refrigeration circuit Servicing Pressure Ports The equipment is provided with both high and low pressure schraeder ports The ports are located outside the unit case for convenient access Accessory Items Note The following equipment may be pur chased through the nearest Trane dis tributor Water Regulating Valve Assembly The water regulating valve assembly consists of a direct acting valve and a reverse acting valve The direct acting valve opens in response to an increase in discharge pressure during the cooling cycle The reverse acting valve opens in response to a decrease in suction pressure during the heating cycle Water regulating valves should
18. l thermostat is necessary for the control of the unit operation See General Information for thermostat in formation The nameplate provides information for the application of either time delay fuses or HACR circuit breakers for branch circuit protection from the pri mary source of power See Figure 6 for component specifications IF DESUPERHEATER IS USED THE FUSE IS SHIPPED IN A CLOTH LOCKOUT RELAY 24VAC FUSE 2 AMP 480V Installation Electrical 24VAC ENERGY LIMITING CLASS II 75VA BREAKER TYPE TRANSFORMER COMPRESSOR RUN CAPACITOR 370V COMPRESSOR CONTACTOR 3 POLE 24VAC 10 POLE TERMINAL ALUMINUM pae STRIP 20A 250V GROUND TERMINAL Figure 6 Electric component location Table 1 Electrical Data Unit Model GSSD 024 030 036 042 048 060 072 Volts 60HZ 1Phase 208 230 208 230 208 230 208 230 208 230 208 230 208 230 Compressor RLA 11 4 13 6 15 18 4 20 4 28 32 1 Compressor LRA 56 67 73 95 109 169 169 Electrical Blower Motor RLA 3 5 5 6 5 6 5 6 7 4 7 4 Min Circuit Amp 14 7 17 4 19 2 23 4 25 9 35 4 40 5 Max Fuse Size 25 30 30 40 45 60 70 Desuperhtr Pump RLA 0 40 0 40 0 40 0 40 0 40 0 40 0 40 Note 208 230 volt equipment is designed to operate between 197 and 253 volts Operation outside of these ranges is likely to adversely affect the service life of the equipment 12 Pressure Switch A high pressure switch is provided to prote
19. oz Line oz 1 4 inch 0 352 N A 3 8 inch 0 928 N A 1 2 inch 1 152 0 032 5 8 1 840 0 048 3 4 4 272 0 064 7 8 inch N A 0 080 1 1 8 inch N A 0 144 Note If piping runs exceed 50 feet the next highest pipe size should be used GSSD Units Coupled with Non TWE Air Handlers and Fine Tuning 1 Place the GSSD system in the cooling mode 2 Throttle down the water flow with a ball valve until the leaving fluid temperature is 95 degrees F 16 3 Charge the system unit until a level of 10 degrees superheat 15 achieved To determine super heat an accurate suction line temperature needs to be taken along with the suction pressure The sub cooling will be approxi mately 8 degrees to 5 degrees F Allow system to run 20 minutes for conditions to stabilize before measuring the super heat Return water flow to 3 gpm per nominal ton of capacity Refrigeration System Compressor The unit includes high efficiency scroll compressor with and internal vibration isolator that absorbs starting and stopping energy It also contains an internal overload protection External vibration isolation is provided by rubber mounting devices located underneath the mounting base of the compressor Water to Refrigerant Heat Exchanger The water to refrigerant heat exchanger is a high quality stainless steel braze plate heat exchanger This stainless material offers exceptional corrosion resistance The
20. there needs to be an acceptable way to discharge it after it has passed through the heat pump three ton heat pump is Installation Water Loop apt to use one million gallons of water per year It may be necessary to install a recharge well to return the water to the aquifer In some soils this may be difficult to do Water quality must also be acceptable to maintain the integrity and life of the unit The loop fluid must have minimal suspended solids and must be non corrosive to copper or brass See Table 2 for specifications Table 2 Water Supply Requirements Scaling Calcium and magnesium salts Less than 350 ppm total hardness Corrosion pH 7 5 9 5 Hydrogen Sulfide Less than 1 ppm Sulfates Less than 25 ppm Carbon dioxide Less than 75 ppm Chloride Less than 125 ppm As solids Less than 1000 ppm Biological Growth Iron bacteria Low Erosion Suspended Solids Low 15 Ground Water Applications Closed Loop Loop sizing should be done by a qual ified installer to insure maximized unit performance In areas where the ground water tem perature is 66 degrees F or less the earth coupling fluid requires at least a 15 percent by volume antifreeze solu tion Using Table 3 calculate the ap proximate water volume of the system Add one gallon to your total as an allowance for water in each heat pump and connection hoses Check the earth coupling design for the anti freeze percentage
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