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INSTALLATION INSTRUCTIONS
GEOTHERMAL HEAT PUMP
GW024 GW036 GW048 GW060
Earth Loop Fluid Temperatures 25° – 110°F
Ground Water Temperatures 45° – 75°
NOTE: Models covered by this installation manual are NOT for use as
pool heaters or in marine applications.
BMC, Inc.
Bryan, Ohio 43506
WATER-TO-WATER
Models:
GW070
MIS-3159
Manual:
Supersedes: 2100-583F
Date:
Page
2100-583G
5-17-18
1 of 48
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Summary of Contents for BMC GW024
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Page 1: Installation Instructions
INSTALLATION INSTRUCTIONS WATER-TO-WATER GEOTHERMAL HEAT PUMP Models: GW024 GW036 GW048 GW060 GW070 Earth Loop Fluid Temperatures 25° – 110°F MIS-3159 Ground Water Temperatures 45° – 75° NOTE: Models covered by this installation manual are NOT for use as pool heaters or in marine applications. -
Page 2: Table Of Contents
CONTENTS Desuperheater (Potable Hot Water Assist) Getting Other Informations and Publications ..3 Description .............. 23 General Information Location ............... 23 Water Source Nomenclature ........4 Electrical Connection ..........23 Application and Location Installation Procedure - General ......23 General .............. -
Page 3: Getting Other Informations And Publications
GETTING OTHER INFORMATION AND PUBLICATIONS These publications can help you install the air FOR MORE INFORMATION, CONTACT conditioner or heat pump. You can usually find these THESE PUBLISHERS: at your local library or purchase them directly from the ACCA Air Conditioning Contractors of America publisher. -
Page 4: General Information Water Source Nomenclature
Loop circulating pumps – Source & Load are field-installed external of the GSH unit for ease of installation, maintenance and service. TABLE 1 RATED FLOW RATES FOR VARIOUS FLUIDS MODEL APPLICATION SOURCE GW024 GW036 GW048 GW060 GW070 Loop Ground Loop (15% Methanol, Propylene, Glycol, etc. -
Page 5: Table 2 Electrical Specifications
TABLE 2 ELECTRICAL SPECIFICATIONS MODEL GW024 GW036 GW048 GW060 GW070 Electrical Ratings (Volts/Hz/Phase) 208/230-60-1 Operating Voltage Range 253-197 VAC Minimum Circuit Ampacity 16.9 21.4 28.8 36.1 39.4 +Field Wire Size Ground Wire Size ++Delay Fuse of Circuit Breaker Max. COMPRESSOR... -
Page 6: Figure 1 Unit Dimensions
Manual 2100-583G Page 6 of 48... -
Page 7: Application And Location
APPLICATION AND LOCATION NOTE: MODELS COVERED BY THIS INSTALLATION MANUAL ARE NOT FOR USE AS A POOL HEATER OR IN MARINE APPLICATIONS GENERAL Prior to setting the unit, consider ease of piping and electrical connections for the unit. Also for units which will be used Each unit is shipped internally wired, requiring both ground- with a desuperheater, consider the proximity of the unit to source and load-side water piping, aquastat wiring, 230/208... -
Page 8: Ansi Z535.5 Definitions
ANSI Z535.5 Definitions: • DANGER (color RED): Indicate[s] a hazardous situation which, if not avoided, will result in death or serious injury. The signal word “DANGER” is to be limited to the most BEFORE DRILLING OR DRIVING ANY SCREWS INTO extreme situations. -
Page 9: Power & Control Wiring
POWER & CONTROL WIRING HIGH VOLTAGE LINE SUPPLY LOW VOLTAGE CONTROL WIRES Supplied with the unit is an adequate length of ¾" liquid-tite Supplied with the unit is an adequate length of ½" plastic conduit and fittings to run internally within the sheet metal conduit and fittings to run internally within the sheet metal chassis from the control panel to one of four (4) 1⅛"... -
Page 10: Relocatable Control Panel
RELOCATABLE CONTROL PANEL The control panel of the GW-Series products can be 3. Remove four (4) screws securing control panel to relocated to best suit the installation. It is factory shipped unit base. where the control panel is located on the same side of the 4. -
Page 11: Control Wiring
POWER & CONTROL WIRING FIGURE 4 WIRE ENTRANCE CONDUITS CONTROL PANEL CONDUITS MIS-3162 The GW-Series Geothermal Water-to-Water Heat Pumps 2. Program a length of time to offset Stage #2 being contain 2-stage compressors. This will need to be thought energized following Stage #1 call. This will through in planning and ordering the Aquastat control. -
Page 12: Wiring - Low Voltage
WIRING – LOW VOLTAGE WIRING UNIT MAIN POWER WIRING For low voltage connections between the Aquastat and the geothermal heat pump, a low voltage terminal strip is This equipment requires a nominal 208/230-60-1 power factory mounted in the heat pump. supply for proper operation. -
Page 13: Piping Access To Unit
PIPING ACCESS TO UNIT Water Piping to and from the unit enters the unit cabinet on Various fittings are available so you may then connect to the either the front or rear-side through the ability to relocate the unit with various materials and methods. These methods control panel. -
Page 14: Load Side Water Connections
LOAD SIDE WATER CONNECTIONS The use of a buffer tank is highly recommended on the For example, assume it’s desired that a heat pump operates load side of the GW-Series Water-to-Water heat pumps. with a minimum compressor on-cycle duration of 10 If heat pump sizing at all the various conditions is not minutes. -
Page 15: Figure 5 Typical Load Side Hydronic System
Manual 2100-583G Page 15 of 48... -
Page 16: Ground Loop (Earth Coupled Water Loop App.)
GROUND LOOP (EARTH COUPLED WATER LOOP APPLICATIONS) NOTE: Unit shipped from factory with 75 PSIG low Most household water systems have more than enough pressure switch wired into control circuit and must be water pressure either from the well pump or the municipal rewired to 55 PSIG low pressure switch for ground water system to overcome the pressure of head loss in ½... -
Page 17: Figure 7A Circulation System Design
FIGURE 7 FIGURE 7A Thermometer FIGURE 7 Thermometer Thermometer NOTE: Slide retaining cap back to expose Dial face pressure guage NOTE: Slide retaining cap back to expose double o-rings. Apply petroleum jelly to o-rings with guage adaptor Dial face pressure guage double o-rings. -
Page 18: Ground Water (Well System App.)
GROUND WATER (WELL SYSTEM APPLICATIONS) NOTE: It is highly recommended on ground water Observe the water flow direction indicated by the arrow on systems (pump & dump) that a cupronickel coaxial coil the side of the valve body. is utilized on the source side of the system. Not doing Strainer (8) installed upstream of water coil inlet to so, may void the product warranty due to aggressive/ collect foreign material which would clog the flow valve... -
Page 19: Figure 8 Water Connection Components
GROUND WATER (WELL SYSTEM APPLICATIONS) The pressure requirements put on the pump are directly not undersized, which would create too much pressure due affected by the diameter of pipe being used, as well as the to friction loss. High pressure losses due to undersized water flow rate through the pipe. -
Page 20: System Start Up Procedure For Ground Water App
GROUND WATER (WELL SYSTEM APPLICATIONS) SYSTEM START UP PROCEDURE FOR consider the overall capacity of the well when thinking GROUND WATER APPLICATIONS about a water source heat pump because the heat pump may be required to run for extended periods of time. 1. -
Page 21: Remedies Of Water Problems
GROUND WATER (WELL SYSTEM APPLICATIONS) REMEDIES OF WATER PROBLEMS Acid Cleaning the Water Coil or Heat Pump Recovery Unit. If scaling of the coil is strongly suspected, the coil Water Treatment. Water treatment can usually be can be cleaned with a solution of Phosphoric Acid (food economically justified for water loop systems. -
Page 22: Lake & Pond Installations
GROUND WATER (WELL SYSTEM APPLICATIONS) LAKE AND POND INSTALLATIONS E. A pressure tank should be installed in dwelling to be heated adjacent to the the ground water heat Lakes and ponds can provide a low cost source of water pump. A pressure switch should be installed at the for heating and cooling with a ground water heat pump. -
Page 23: Desuperheater (Potable Hot Water Assist)
DESUPERHEATER (POTABLE HOT WATER ASSIST) DESCRIPTION INSTALLATION PROCEDURE – GENERAL The system is designed to heat domestic water using the Before beginning the installation, turn off all power heat recovered from a water source unit’s hot discharge supplies to the water heater and unit, and shut off the main gas. -
Page 24: Operation Of Heat Recovery Unit
DESUPERHEATER (POTABLE HOT WATER ASSIST) OPERATION OF THE HEAT RECOVERY START UP AND CHECK OUT UNIT Be sure all shut off valves are open and all power supplies The pump module is a very simple device containing basic are on. Open a hot water faucet to permit any air to bleed controls and a circulating pump. -
Page 25: Figure 10 Desuperheater Wiring Diagram
DESUPERHEATER (POTABLE HOT WATER ASSIST) FIGURE 10 DESUPERHEATER WIRING DIAGRAM COMPRESSOR CONTACTOR SIGNAL FROM GEOTHERMAL LOGIC CONTROL LOW VOLTAGE DESUPERHEATER TERMINAL STRIP PUMP CONTROL BLACK CONTROL BLACK LOGIC THERMISTOR BLACK BLACK BLACK THERMISTOR BLACK OVER TEMP. LIMIT LINE VOLTAGE DESUPERHEATER PUMP PLUG MIS-2844 A PUMP... -
Page 26: Figure 11 One-Tank Desuperheater System
DESUPERHEATER (POTABLE HOT WATER ASSIST) Manual 2100-583G Page 26 of 48... -
Page 27: Figure 12 Two-Tank Desuperheater System
DESUPERHEATER (POTABLE HOT WATER ASSIST) Manual 2100-583G Page 27 of 48... -
Page 28: Figure 13 Inlet & Outlet Thermistor Temp Curves
DESUPERHEATER (POTABLE HOT WATER ASSIST) DESUPERHEATER CONTROL BOARD • If temperature difference is greater than 3°F, the SEQUENCE OF OPERATION control will continue to energize the pump relay. • If temperature difference is less than 3°F, then the The desuperheating control board will make a control will de-energize the pump relay. -
Page 29: Sequence Of Operation
SEQUENCE OF OPERATION PART LOAD COOLING FULL LOAD HEATING When the thermostat system switch is placed in “COOL”, The unit should already be operating in Part Load Heating it completes a circuit from “R” to “O”, energizing operation prior to Full Load Cooling being energized the reversing valve solenoid. -
Page 30: High & Low Pressure Switch
SEQUENCE OF OPERATION HIGH PRESSURE SWITCH INTELLIGENT RESET (Terminals HP1 & HP2) Circuit will be proved as The Geothermal Logic Control has an intelligent reset “closed” prior to energizing “A” or “CC” terminals. feature after a safety control is activated. The controller If pressure switch opens, compressor will go into locks out the unit for 5 minutes, at the end of this period, soft lockout mode and compressor operation will be... -
Page 31: Refrigerant Charge
REFRIGERANT CHARGE The models covered by this manual require R-410A TOPPING OFF SYSTEM CHARGE refrigerant, and Polyol Ester refrigerant oil. If a leak has occurred in the system, reclaiming, evacuating (see previous criteria), and charging to the GENERAL nameplate charge is recommended. 1. -
Page 32: Figure 14 System Component Locations
COMPONENT LOCATION FIGURE 14 SYSTEM COMPONENT LOCATIONS DESUPERHEATER COIL REVERSING WATER COIL VALVE LOW PRESSURE SWITCH COMPRESSOR HIGH PRESSURE SWITCH WATER COIL FLOW SWITCH EXPANSION VALVE DESUPERHEATER PUMP FILTER DRIER UNIT HIGH VOLTAGE FLOW SWITCH LOW VOLTAGE MIS-3171 FIGURE 15 ELECTRICAL CONTROL LOCATIONS FLOW CENTER CIRCUIT BREAKERS... -
Page 33: Figure 16 Cooling Cycle Diagram
REFRIGERATION SYSTEM DIAGRAMS FIGURE 16 COOLING CYCLE DIAGRAM Manual 2100-583G Page 33 of 48... -
Page 34: Figure 17 Heating Cycle Diagram
REFRIGERATION SYSTEM DIAGRAMS FIGURE 17 HEATING CYCLE DIAGRAM Manual 2100-583G Page 34 of 48... -
Page 35: Manual 2100-583G
FIGURE 18A — GW024 PRESSURE TABLES FULL LOAD COOLING PART LOAD COOLING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG... -
Page 36: Manual 2100-583G
FIGURE 18B — GW024 PRESSURE TABLES FULL LOAD HEATING PART LOAD HEATING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG... -
Page 37: Manual 2100-583G
FIGURE 19A — GW036 PRESSURE TABLES FULL LOAD COOLING PART LOAD COOLING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG Manual 2100-583G Page... -
Page 38: Manual 2100-583G
FIGURE 19B — GW036 PRESSURE TABLES FULL LOAD HEATING PART LOAD HEATING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG Manual 2100-583G Page... -
Page 39: Manual 2100-583G
FIGURE 20A — GW048 PRESSURE TABLES FULL LOAD COOLING PART LOAD COOLING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 11** 11**... -
Page 40: Manual 2100-583G
FIGURE 20B — GW048 PRESSURE TABLES FULL LOAD HEATING PART LOAD HEATING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 11** 11**... -
Page 41: Manual 2100-583G
FIGURE 21A — GW060 PRESSURE TABLES FULL LOAD COOLING PART LOAD COOLING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 13** 13**... -
Page 42: Manual 2100-583G
FIGURE 21B — GW060 PRESSURE TABLES FULL LOAD HEATING PART LOAD HEATING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 13** 13**... -
Page 43: Manual 2100-583G
FIGURE 22A — GW070 PRESSURE TABLES FULL LOAD COOLING PART LOAD COOLING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 16** 16**... -
Page 44: Manual 2100-583G
FIGURE 22B — GW070 PRESSURE TABLES FULL LOAD HEATING PART LOAD HEATING SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES SOURCE LOAD SYSTEMS REFRIGERANT PRESSURES EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG EWT °F GPM EWT °F GPM Suction PSIG Discharge PSIG 16** 16**... -
Page 45: Troubleshooting
TROUBLESHOOTING Manual 2100-583G Page 45 of 48... -
Page 46: Service
SERVICE SERVICE HINTS COMPRESSOR SOLENOID Check all power fuses or circuit breakers to ensure that See Sequence of Operation on Pages 28 & 29 for function. they are all the correct rating. A nominal 24-volt direct current coil activates the internal compressor solenoid. -
Page 47: Ground Source Hp Perf. Report & Checklist - Perform. Unit
GROUND SOURCE HEAT PUMP PERFORMANCE REPORT DATE TAKEN BY: 1. Unit Manufacturer ________________ Model No. ________________ Serial No. _________________ Thermostat Manufacturer __________________ Model No. _________________ 2. Company Reporting _______________________________________________________________________ 3. Installed by ___________________________________________________ Date Installed ____________________ 4. User's (Owner's) Name ___________________________________________________________________________ Address________________________________________________________________________________________ ________________________________________________________________________________________ 5. - Page 48 THE FOLLOWING INFORMATION IS NEEDED TO CHECK PERFORMANCE OF UNIT. *Cooling * Heating LOOP SIDE DATA 8. Entering fluid temperature 9. Entering fluid pressure 10. Leaving fluid temperature 11. Leaving fluid temperature 12. Pressure drop through coil 13. Gallons per minutes through water coil 14.
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