GeoSource 2000 Installation and Operating Instructions Hydronic GW 29 Thru 380 Series
GeoSource 2000 Hydronic Unit Transformer Hydronic Pump Relay Contactor Controller Reversing Valve Expansion Valve Low Pressure Switch Desuperheater (Optional) Scroll Compressor Desuperheater Pump High Pressure Switch Air Pad 1
TABLE OF CONTENTS Section I. Title Page Introduction to ECONAR Heat Pumps . . . . . . . . . . . . . . . . . . . . . . 2 II. Unit Location/Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 III. Earth Loop Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A. Closed Loop Applications B. Open Loop Applications 1) Open Loop Freeze Protection Switch 2) Water Coil Maintenance a. Freeze Cleaning b. Chlorine Cleaning c. Miratic Acid Cleaning IV.
I. INTRODUCTION TO ECONAR HEAT PUMPS ECONAR Energy Systems, Corp. has been producing geothermal heat pumps in Minnesota for over fifteen years. The cold winter climate has driven the design of ECONAR Energy System's heating and cooling equipment to what is known as a "Cold Climate" geothermal heat pump. This cold climate technology focuses on maximizing the energy savings available in heating dominated regions without sacrificing comfort.
The GeoSource 2000 is designed to operate on either vertical or horizontal closed loop applications. Vertical loops are typically installed with a well drilling rig up to 200 feet deep or more. Horizontal systems are typically installed with excavating or trenching equipment approximately six to eight feet deep, depending on geographic location and length of pipe used. Earth loops must be sized properly for each particular geographic area, soil type, and individual capacity requirements.
The purge pump can be used to pressurize the system to an initial static pressure of 30 to 40 psi. Make sure the system is at this pressure after the loop pipe has had enough time to stretch. In order to achieve the 30 to 40 psi initial pressure, the loop may need to be pressurized to 60 to 65 psi. This static pressure will fluctuate from heating to cooling season, but the pressure should always remain above zero so circulation pumps do not cavitate and air cannot be pulled into the system.
Water discharge is generally made to a drain field, stream, pond, surface discharge, tile line, or storm sewer. ,CAUTION: Using a drain field requires soil conditions and adequate sizing to assure rapid percolation, or the required flow rates will not be achieved. Consult local codes and ordinances to assure compliance. DO NOT discharge water to a septic system. The heat pump should never be operated with flow rates less than specified.
11. If the water still contains mineral debris, and if the flow through the unit did not improve along with an increase in the temperature difference between the water supply and discharge, repeat the entire procedure listed above. 12. Reset the heat pump for normal operation. 1. 2. 3. 4. 5. 6. 7. 8. 9. b. Chlorine Cleaning (Bacterial Growth) Turn the thermostat to the "Off" position. Connect a submersible circulating pump to the hose bibs on the entering and leaving water sides of the heat exchanger.
Night setback thermostats are not recommended on radiant floor systems due to the response time of the slab. Radiant floor systems are not usually recommended for cooling, since cold, clammy floors and poor dehumidification may result. To provide cooling to a radiant floor heating installation, the installation of a fan coil unit is recommended. Another alternative is a GeoSource 2000 combination heat pump. B.
A. Storage Tanks Coupling the heat pump to the space conditioning heat exchanger through a water storage tank is very common. In fact, the only instance where these storage tanks are not recommended is when the heat pump is coupled to a large heat exchanger capable of absorbing the entire heating or cooling capacity of the heat pump (see Figure 5).
The entire system must be purged of air during initial installation and pressurized to a 10-25 psi static pressure to avoid air entering the system. This initial static pressure may fluctuate when going from the heating to cooling modes but should always remain above zero. If a leak in the system allows the static pressure to drop, the leak must be repaired to assure proper system operation. Air continually entering the loop can cause corrosion, bacteria, or pump cavitation.
Figure 3 – ECONAR Hydronic Heat Pump – Multizone System Figure 4 – ECONAR Hydronic Heat Pump – Radiant Floor Heating and Fan Coil Cooling 10
Figure 5 – ECONAR Hydronic Heat Pump – Single Zone Hydronic Heating Heat Exchanger )Note: Expect a 10°F temperature differential between supply tank and receiving tank when transferring heat with intermediate heat exchanger.
VI. UNIT SIZING Selecting the unit capacity of a hydronic geothermal heat pump requires four things: A) Earth Loop Configuration and Design Water Temperatures. B) Hydronic Side Heat Exchanger Operating Temperatures. C) Building Heat Loss/Heat Gain. D) Temperature Limitations A. Earth Loop Configuration and Design Water Temperatures Loop configurations include the open and closed loop varieties. Heat pump flow rate requirements vary depending on loop configuration (see Table 1).
that drives the suction pressure below cutout conditions). Hydronic side limits in cooling fall into the 25oF entering water temperature range. VII. ELECTRICAL SERVICE The main electrical service must be protected by a fuse or circuit breaker, and be capable of providing the amperes required by the unit at nameplate voltage. All wiring shall comply with the national electrical code and/or any local codes that may apply.
pumps from receiving high voltage through the common wiring if it is turned off at the circuit breaker for service. Power is supplied to the thermostat by connecting the R and X terminals to the heat pump terminal strip. The Y terminal energizes the compressor. The unit is put into the cooling mode when the thermostat energizes the O terminal, which operates the 4-way reversing valve. The L terminal is used to power the lockout LED on a thermostat, which indicates a compressor lockout.
the event of a compressor lockout the controller will send a signal from L on the terminal strip to an LED on the thermostat to indicate a lockout condition. This lockout condition means that the unit has shut itself down to protect itself, and will not come back on until power has been disconnected (via the circuit breaker) to the heat pump for one minute. Problems that could cause a lockout situation include: 1. Water flow or temperature problems 2. Internal heat pump operation problems 3.
pressure exceeds 400 psi or goes below 25 psi. If the system exceeds 400 psi, the high-pressure switch will trip and lock the unit off until power has been disconnected at the circuit breaker for approximately one minute. System pressures below 25 psi in the heating mode will trip the low pressure switch and lock the unit out until the power supply has been de-energized for one minute.
XII. TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS If the heat pump goes into lockout on a high or low pressure switch, the cause of the lockout can be narrowed down by knowing the operating mode and which pressure 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.
PROBLEMS POSSIBLE CAUSE Thermostat Wiring Blown Fuse High or Low Pressure Controls Defective Capacitor Hydronic pump runs Voltage Supply Low but compressor does not, or compressor Low Voltage Circuit short cycles.
XIV.
Figure 8 – Electrical Diagram for GeoSource 2000 Hydronic Series Heat Pump [GW(98,120)0-x-TxTx] 20
Model CFM 3 HBC-3 310 4 HBC-3 510 5 HBC-3 600 6 HBC-3 730 8 HBC-3 870 10 HBC-3 1070 13 HBC-3 1400 Heating dP Capacity (1000 BTU/hr) (Ft. of Head) 120oF EWT 140oF EWT 3.0 12.0 12.2 17.4 2.0 6.0 11.7 16.7 1.0 1.9 10.5 14.9 3.5 18.0 16.1 22.9 2.5 10.0 15.7 22.3 1.5 4.5 14.5 20.6 4.0 10.0 19.7 28.0 3.0 5.9 19.1 27.1 2.0 2.9 17.9 25.4 5.5 17.0 24.1 34.3 4.0 10.0 23.4 33.3 2.5 4.2 21.9 31.2 6.0 11.0 29.2 41.5 4.5 6.5 28.3 40.2 3.0 3.0 26.3 37.4 8.0 14.0 34.9 49.7 6.0 8.1 34.2 48.6 4.0 3.9 32.0 45.
Outdoor Swimming Pool Heat Pump Sizing Worksheet For In-ground Pool Applications Project Name: Date: 1) 2) 3) Pool Length in Ft. Pool Width in Ft. Average Pool Depth in Ft. 7) Calculated Pounds of Water to be Heated.
XV. DESUPERHEATER (OPTIONAL) which reduces pump life and causes noise problems in the pump. A spring-type check valve with a pressure rating of 1/2 psi or less is recommended. A GeoSource 2000 unit equipped with a desuperheater can provide supplemental heating of a home's domestic hot water. This is done by stripping heat from the superheated gas leaving the compressor and transferring it to a hot water tank.
Figure 9 – Preferred Desuperheater Installation Figure 10 – Alternate Desuperheater Installation 24
GeoSource 2000, DualTEK, Vara, Vara 2 PlusTM and Invision3 Heat Pumps USA and Caada Residential and Limited Commercial Warranty** Residential Applications Only: All Parts – 2 Years Years 1 through 2, ECONAR Energy Systems Corp. will provide a free replacement part upon prepaid return of all defective parts, F.O.B. Appleton, MN for any part which fails to function properly due to defective material, or workmanship. * During this period, ECONAR will provide a free relacement part F.O.B.
ColdClimate Geothermal Heat Pumps 19230 Evans Street (Hwy 169) Elk River, MN 55330 USA 1-800-4-ECONAR www.econar.com NRTL/C 90-1009 Rev. 2/04 26 ECONAR Energy Systems Corp.
