Installation & Operating Instructions Engineering Specifications Hydronic GW 240 thru 360 Series
TABLE OF CONTENTS Section Title Page I. Ultra Hydronic Models A. Performance Ratings B. Configuration Options 2 II. Introduction to ECONAR Heat Pumps 3 III. Hydronic Heat Pump Applications A. Radiant Floor Heating B. Fan Coils C. Baseboard Heating D. Other Applications 4 IV. Unit Sizing A. Building Heat Loss / Heat Gain B. Ground Sources and Design Water Temperatures C. Hydronic-Side Heat Exchangers D. Temperature Limitations 5 V. Unit Location / Mounting 6 VI. Ground Source Design A.
I. Ultra Hydronic Models Performance Ratings Ground Loop MODELS GW 2400 GW 3600 st 1 Stage 2nd Stage 1st Stage 2nd Stage HEATING COOLING 2nd Stage: 32°F EWT 1st Stage: 41°F EWT 2nd Stage: 77°F EWT 1st Stage: 68°F EWT 104ºF Hyd EWT 53.6ºF Hyd EWT Hyd GPM Ground GPM BTU/hr COP BTU/hr EER 40 40 54 54 60 60 78 78 130,600 222,400 189,750 318,000 4.3 3.3 4.3 3.3 142,000 240,700 191,700 316,500 21.8 15.2 19.6 14.
II. INTRODUCTION TO ECONAR HEAT PUMPS Enertech Global, LLC, is home to ECONAR geothermal heat pumps, a brand that has been in Minnesota for over twenty years. The cold winter climate has driven the design of ECONAR’s heating and cooling equipment to what is known as a "ColdClimate" geothermal heat pump. This cold climate technology focuses on maximizing the energy savings available in heating dominated regions without sacrificing comfort.
maintained as low as comfortably possible. The type of floor covering and the spacing of the pipe in the floor have the greatest effect on operating fluid temperature.
hydronic loop and the open system is required when corrosive fluid is used in the open loop; especially on swimming pools where pH imbalance can damage the heat pump. Note: Expect the operating temperature of an indirect coupled application to be 10oF below the LWT of the heat pump. Other forms of closed loop systems such as indoor swimming pools, pretreated fresh air systems, snow melt systems, and valance heating/cooling systems are also very common with hydronic heat pumps.
• The acceptable hydronic LWT is 70 F to 115 F for o o o o heating and 35 F to 50 F for cooling. Hydronic EWT should remain above 50oF to avoid low-pressure lockouts. o o • The acceptable Ground Loop EWT is 25 F to 50 F for o o heating and 50 F to 100 F for cooling. V. UNIT LOCATION / MOUNTING CAUTION – Units must be kept in an upright position during transportation or installation, or severe internal damage may occur.
into the heat pump. Filling and purging a loop system are very important steps to ensure proper heat pump operation. Each loop must be purged with enough flow to ensure two feet per second flow rate in each circuit in the loop. This normally requires a 1½ to 3 HP high-head pump to circulate fluid through the loop to remove all the air out of the loop. Allow the pump to run 10 to 15 minutes after the last air bubbles have been removed.
zone. Small Grundfos pumps (230 Vac) should be used as circulator pumps. These pumps are impedance protected and do not require additional fusing if powered directly from the heat pump. CAUTION – Never operate with hydronic flow rates less than specified. Low flow rates, or no flow, may cause the unit to shut down on a pressure lockout or may cause a freeze rupture of the heat exchanger.
be connected to the middle leg on the contactor. Pressure relief valves are required on hydronic applications. A 30 psig relief is adequate if the system is operated at 12 to 15 psig pressure. If a water heater is used for a storage tank, the 150 psig pressure relief may be acceptable (check local codes). E. Application Diagrams Figures 1 through 4 show the components of a hydronic heat pump system discussed above used in some common applications.
operate the control components may occur. system if zone valves were used instead of two pumps. B. Remote Hydronic Controls C. Controller The GW240, and 360 use tandem compressors (two connected together) configured as stage-controlled with separate Y and Y2 inputs with an adjustable time delay for the Y2-controlled contactor. Consult the instructions packaged with the remote hydronic controls for proper mounting and operation of the hydronic controls.
The hydronic circulator pump is energized either directly with the compressor contactor through the internal pump relay (RP) and 3-pole terminal block (BP) or through an isolation relay having its 24Vac coil wired to the Y and X terminals. identified as “Fault Test” on the controller board and as DO on the wiring diagram. It is an isolated dry contract output (0.1 ohm resistance) that closes during a controller lockout and is intended for use as an input to a dial-out type of monitoring system.
system to run in cooling. The compressor will start after an anti-short-cycle period of 70 to 130 seconds from its last shutdown. The anti-short-cycle period is indicated by the red light on the controller. • After 5 minutes of cooling operation, check hydronic side return and supply water temperatures. A water temperature drop of 10oF to 15oF is normal (variation in water temperature and water flow can cause slight variations).
GW 2400 Heating Performance Data GROUND EWT o F GPM dP psig dP ft Hyd LWT o F 70 25 30 35 40 50 60 60 60 60 60 5.6 5.6 5.6 5.6 5.6 First Stage Second Stage Second Stage HYDRONIC FLOW - 40 GPM HYDRONIC FLOW - 40 GPM 3.4 PSIG dP, 7.9 FT dP 3.4 PSIG dP, 7.9 FT dP REFRIGERANT PRESSURE TEMP DROP CAP kBTUh PWR kW COP HE kBTUh TEMP DROP CAP kBTUh PWR kW COP HE kBTUh 5.9 117.4 5.3 6.5 99.4 10.6 211.6 10.6 5.8 175.4 85 5.7 113.4 6.7 5.0 90.6 10.4 204.4 13.
GW 3600 Heating Performance Data GROUND EWT o F 25 30 35 40 50 GPM 78 78 78 78 78 dP psig 6.0 6.0 6.0 6.0 6.0 dP ft Hyd LWT o F First Stage Second Stage Second Stage HYDRONIC FLOW - 54 GPM HYDRONIC FLOW - 54 GPM 3.3 PSIG dP, 7.6 FT dP 3.3 PSIG dP, 7.6 FT dP REFRIGERANT PRESSURE TEMP DROP CAP kBTUh PWR kW COP HE kBTUh TEMP DROP CAP kBTUh PWR kW COP HE kBTUh 70 6.9 187.6 9.2 5.9 156.0 12.6 331.3 16.4 5.9 275.4 85 6.6 177.5 10.8 4.8 140.8 11.9 313.
XIV. Physical Dimensions – Ultra Hydronic Models GW 240 and 360 Series 36.7" 30" 0.88" Dia. Knockouts 51" Access Panel Out to Ground Loop Out to Hydronic Load In from Ground Loop In from Hydronic Load Ground Model *GW240 Hydronic Inlet Outlet Inlet Outlet Desuperheater 2.0 MPT 2.0 MPT 2.0 MPT 2.0 MPT Not Available 2.0 MPT 2.0 MPT 2.0 MPT 2.0 MPT Not Available *GW360 *Note: GW 77-110 have a 1-1/2” support rails. This height is in addition to the height shown in the drawing.
XVI.
Wiring Diagram – Ultra Hydronic Models [GW360x-x-UxTx] Hydronic Control System NEC Class 1 Wiring (24Vac) Yel NC NO T2 T1 Y2 Blu DO SP E R G O Y W2 L X J1 F1 CB5 R Equipment Ground Yel 3-Phase Power COM Yel PWR TD Red X2 Red 24V Transf WHT Power Block H2, 208V Yel X1 Blu X J2 BLK H1, BLK BLU Blu RED Red X B L K Yel J3 R B L U Yel R E D Red ASC X Controller Blu Blu O Blu Blu X PA DT LP/ FP M1 G X HP M1 Yel Blu Blk RI Red Red Blk B L K Red B L U Blu
XVII. Correction Factors Ground Side Flow Rates NOMINAL GPM 60% 70% 80% 90% 100% 110% 120% 130% 140% 150% HEATING BTU/hr KW 0.95 0.98 0.97 0.98 0.98 0.99 0.99 0.99 1.00 1.00 1.01 1.00 1.02 1.01 1.03 1.01 1.04 1.01 1.05 1.02 GW, Hydronic Side Flow Rates COOLING BTU/hr KW 0.98 1.07 0.98 1.05 0.99 1.03 0.99 1.02 1.00 1.00 1.01 0.99 1.02 0.98 1.02 0.98 1.03 0.97 1.03 0.96 NOMINAL GPM 80% 90% 100% 120% 140% 160% 180% 200% HEATING BTU/hr KW 0.99 1.03 1.00 1.01 1.00 1.00 1.00 0.97 1.01 0.96 1.01 0.94 1.01 0.
XVIII. TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS If the heat pump goes into lockout on a high or low pressure switch or discharge refrigerant temperature, the cause of the lockout can be narrowed down by knowing the operating mode and which switch the unit locked out on. The following table will help track down the problem once this information is known. Note – A lockout condition is a result of the heat pump shutting itself off to protect itself, never bypass the lockout circuit.
XIX. TROUBLESHOOTING GUIDE FOR UNIT OPERATION PROBLEM POSSIBLE CAUSE Blown Fuse/Tripped Circuit Breaker Blown Fuse on Controller Broken or Loose Wires Voltage Supply Low Entire unit Low Voltage Circuit does not run. Remote Hydronic Control or Room Thermostat CHECKS AND CORRECTIONS Replace fuse or reset circuit breaker. (Check for correct size fuse or circuit breaker.) Replace fuse on controller. (Check for correct size fuse.) Check for loose fuse clips. Replace or tighten the wires.
PROBLEM POSSIBLE CAUSE Remote Hydronic Control or Room Thermostat Compressor Overload CHECKS AND CORRECTIONS Improperly located thermostat (e.g. near kitchen, sensing inaccurately the comfort level in living areas).If thermostat has an anticipator, it should be set at 1.0 or 1.2. Unit short cycles Defective compressor overload, check and replace if necessary. If the compressor runs too hot, it may be due to a insufficient refrigerant charge. Aquastat The differential is set to close on Aquastat.
XX. ADDITIONAL FIGURES, TABLES, AND APPENDICES Fan Coil 3-Way Diverting Valve Expansion Tank Pressure Gauge Radiant Floor Thermostat Instantaneous booster to car wash - 125F Cooling Storage Tank Radiant Heat Storage Tank Circulator Pump Zone Valves Car Wash Storage Tank ECONARHydronic heat pump with PumpPAK Intermediate Heat Exchanger Drains Thermostat/Aquastat Direction of Flow Radiant Floor Zone Note – Always use copper pipe on the hydronic side. Note – Conceptual drawing only.
Fan Coil Fan coil controls tied in with isolation relay. Expansion Tank Air Separator Cooling Aquastat Heating Aquastat Radiant Floor Thermostat ECONARHydronic heat pump with PumpPAK Pressure Gauge Storage Tank Circulator Pump Drains Thermostat/Aquastat Direction of Flow Check Valve Radiant Floor Zone Note – Always use copper pipe on the hydronic side. Note – Conceptual drawing only. Check local codes and use proper plumbing procedures.
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