This document describes the Installation, Operation, and Maintenance of the WSHPC-IOM-2 72-9041-02 Water Source Heat Pump Residential Split Configuration HVAC System, manufactured by American Standard Inc.
Function Description
The GSSD split unit is an ARI-rated water source heat pump designed for residential applications. It operates as a complete split system when coupled with Trane TWE air handlers equipped with ICM 2 variable speed motors. The unit is factory assembled, piped, internally wired, and test-operated, and is ETL and CSA listed. It is designed to provide efficient heating and cooling, with an optional desuperheater for domestic hot water preheating.
Important Technical Specifications
General:
- Product Type: Ground Source Heat Pump (GS)
- Configuration: Split System (S)
- Development Sequence: D
- Nominal Capacity (MBH): Available in 024 (24.1), 030 (29.6), 036 (36.4), 042 (41.1), 048 (48.7), 060 (59.2), and 072 (65.6) MBH.
- Voltage/Hertz/Phase: 208/230-60-1
- Unit Arrangement: Split Condensing Unit (0)
- Design Sequence: C
- Desuperheater: Available with (1) or without (0) desuperheater.
- Freeze Protection: 35 Degree Freezestat (1) or 20 Degree Freezestat (2).
- Brand: Command Aire (C) or Trane (T).
Physical Dimensions and Weight (Approximate):
- Unit Size 024: 23" W x 23-5/16" H x 24-13/16" D, Weight: 163 lbs.
- Unit Size 030-042: 23" W x 23-5/16" H x 24-13/16" D, Weights: 030 (169 lbs), 036 (183 lbs), 042 (203 lbs).
- Unit Size 048-072: 23" W x 23-5/16" H x 24-13/16" D, Weights: 048 (214 lbs), 060 (244 lbs), 072 (277 lbs).
Connections:
- System Water Inlet/Outlet: Female 1-inch NPT swivel quick connectors with stainless steel stop ring.
- Desuperheater Connections (Optional): 1/2-inch NPT female water inlet and outlet.
- Refrigeration Connections: Copper stub-outs, 3/4" O.D. (024) or 7/8" O.D. (030-072) for suction line, 1/2" O.D. for liquid line.
- Electrical: Prewired terminal strip for 24V field control wiring. High voltage (1-1/8" DIA), Low voltage (1-1/8" DIA), Pump control (1-1/8" DIA).
Refrigerant (R22):
- Charge for GSSD & TWE (without line connections):
- GSSD024/TWE031E: 5.0 lbs
- GSSD030/TWE031E: 5.0 lbs
- GSSD036/TWE040E: 8.25 lbs
- GSSD042/TWE040E: 9.25 lbs
- GSSD048/TWE065E: 9.25 lbs
- GSSD060/TWE065E: 10.125 lbs
- GSSD072/TWE065E: 10.75 lbs
- R22 Requirement per foot of line:
- Liquid Line (oz.): 1/4" (0.352), 1/2" (1.152), 5/8" (1.840), 3/4" (4.272).
- Suction Line (oz.): 1/2" (0.032), 5/8" (0.048), 3/4" (0.064), 7/8" (0.080), 1-1/8" (0.144).
Electrical Data (208/230V-60HZ/1Phase):
- Compressor RLA: 11.4 (024) to 32.1 (072)
- Compressor LRA: 56 (024) to 169 (060, 072)
- Blower Motor RLA: 3 (024) to 7.4 (060, 072)
- Min. Circuit Amp.: 14.7 (024) to 40.5 (072)
- Max Fuse Size: 25 (024) to 70 (072)
- Desuperheater Pump RLA: 0.40 (all models)
- Operating Voltage Range: 197 to 253 volts.
Water Quality Requirements (for open loop systems):
- Scaling (total hardness): Less than 350 ppm
- 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
- Total dissolved solids (TDS): Less than 1000 ppm
- Biological Growth (Iron bacteria): Low
- Erosion (Suspended Solids): Low
Refrigeration System Components:
- Compressor: High efficiency scroll compressor with internal vibration isolator and overload protection. External vibration isolation via rubber mounts.
- Water-to-Refrigerant Heat Exchanger: High quality stainless steel braze plate heat exchanger, 450 psig working pressure rating.
- Freezestat: 35°F for open loop/non-antifreeze closed loop, 20°F for closed loop with antifreeze.
- Lockout Relay: Triggers shutdown of compressor, loop pumps, and desuperheater pump if safety devices (low pressure, high pressure, freezestat) are tripped.
- Reversing Valve: Pilot operated sliding piston type with replaceable encapsulated magnetic coil. Energized in cooling, de-energized in heating.
- Refrigerant Tubing: Copper, low temperature lines insulated with 3/8-inch thick elastomeric insulation (UL 94V-5 rated, flame spread rating < 25, smoke density rating < 50).
- Refrigerant Metering: Bi-directional thermal expansion valve for operation with entering water temperatures from 25°F to 120°F.
- Liquid Line Filter: Bi-directional liquid line filter drier.
- Servicing Pressure Ports: High and low pressure Schrader ports located outside the unit case.
Usage Features
Installation:
- Location: Must be placed on a level surface in an indoor protected area, with 2-3 feet clearance for service access. Not for exterior installation.
- Water Connections: Uses 1-inch brass swivel connectors for loop water, eliminating need for backup wrench. Gaskets are provided. Desuperheater connections are 1/2-inch NPT.
- Refrigeration Connections: Copper stub-outs, requiring soldering. Adapters may be needed for air handler connection. All refrigeration and water piping should be insulated.
- Electrical: Power wiring per local codes. Control wiring is 24V. Prewired terminal strip for easy connection. Desuperheater fuse is shipped loose in the electrical compartment.
- Thermostats: Compatible with single-stage manual changeover (Heat-Off-Cool, On-Off fan) or single-stage cool/two-stage heat manual changeover (Heat-Off-Cool, Auto/On fan, Normal-Auxiliary-Emergency Heat) thermostats, depending on whether electric backup heater is used.
Desuperheater (Optional):
- Preheats domestic hot water using heat from the compressor discharge line.
- Operates when discharge line reaches 145°F. Shuts off if incoming water exceeds 125°F to prevent overheating and pump damage.
- Water cooled pump, requires connection to water heater before running.
Ground Water Applications (Open Loop):
- Requires an ample supply of suitable quality water.
- A 60 mesh straining device (sand filter/separator) is mandatory for incoming water line.
- Discharge water must be returned to the aquifer via a recharge well.
Ground Water Applications (Closed Loop):
- Loop sizing must be done by a qualified installer.
- Requires at least 15% by volume antifreeze solution (propylene glycol or methanol) if ground water temperature is 66°F or less.
- Only full strength inhibited propylene glycol or methanol should be used.
Refrigerant Charging:
- Charge system to achieve 10 degrees superheat.
- Sub-cooling should be approximately 8 to 5 degrees F.
- Allow 20 minutes for conditions to stabilize before measuring superheat.
- Return water flow to 3 gpm per nominal ton of capacity.
- For non-TWE air handlers, place GSSD in cooling mode and throttle water flow until leaving fluid temperature is 95°F.
Maintenance Features
Access:
- The top, front half of the diagonal cabinet is removable by removing two screws for access to internal components.
Safety Devices:
- High and low pressure cutouts protect the compressor.
- Freezestat protects the water heat exchanger from freezing.
- All safety devices (except compressor internal overload) are connected to a lockout relay.
Troubleshooting:
- Lockout Relay Reset: Can be reset by cycling power at the disconnect or thermostat system switch. If manually reset before a 5-minute period, the unit will not run.
- Important Notice (Pressure Switch): The low pressure switch must be wired to activate at 35 psig for a 35°F freezestat, or 7 psig for a 20°F freezestat. Incorrect wiring can lead to unit failure and voided warranty.
Warranty:
- Unit Warranty: One year for material and factory workmanship (labor and parts).
- Refrigerant Circuit Warranty: Additional four years for compressor, expansion device, reversing valve (less solenoid coil), and heat exchangers (parts only).
- Voided Warranty: Bypassing or removing any safety device voids the warranty.
Accessories (Purchased Separately):
- Water Regulating Valve Assembly: Direct and reverse acting valves for low flow, or low/high fluid temperature conditions. Beneficial for open loop systems.
- Motorized Water Valve: Installed on the return line of the system between the loop and pump module. Opens when compressor runs, slowly closes when compressor shuts down to prevent water hammer.
- Electric Strip Heaters: ETL listed, install directly inside TWE air handler. Provide supplemental and emergency heat.
- Pump Module: Self-contained pumping package for earth-coupled heat pump systems. Includes insulated Grundfos pumps, cabinet, optional cast iron/bronze pumps, 3-way brass valves. Available in one or two pump modules.
- Hose Kits: Includes brass 1-inch male pipe thread (MPT) by barb-fittings, 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: Helps ensure clean water for the water-to-refrigerant heat exchanger. Recommended strainer is 60 mesh or greater.
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