Two-Speed Geothermal Heat Pump Series Installation and Operation Manual May 2019 Rev.
Table of Contents Contact Information 4 Model Nomenclature 5 Page 2
Technical Data 6 Transportation and Storage 8 Electrical Hazards 9 System Installation 10 Ductwork Considerations 11 Ground Loop System 12 Open Loop System 14 Condensate Considerations 17 DHW PLumbing 18 High and Low Voltage Wiring 19 Dallas Microprocessor 21 DEC Star Blower 25 Start Up Procedures 26 Preventive Maintenance 27 Troubleshooting 29 Wiring Diagram 31 Geocool - All rights reserved Geocool® has compiled this manual with care; however Geocool does not warrant that th
information in this manual is free of errors. Geocool reserves the right to change any portion of this manual without notice. The appearance of any technical data or editorial material in this manual does not constitute endorsement, warranty, or guarantee by Geocool of any product, service, process, procedure, design, or the like. The user assumes the entire risk of the use of any information in this manual. Contact Information: Geocool 48 Remington Way Hickory, Ky 42051 www.geo.
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1.0 Technical Data (cont.
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Move and store units in an upright position. Do not stack units. Inspect shipment for shipping damage and check packing slips for accuracy. Any equipment or cartons in question should be removed from the packing and physically inspected. If any damage is detected, the carrier should make a note on the delivery slip acknowledging the damage. In some cases smaller items like thermostat or temperature sensors will be packed and shipped inside the unit.
THE FOLLOWING IS A GENERAL WARNING STATEMENT WHICH SHOULD BE READ AND UNDERSTOOD BEFORE INSTALLING AND OR OPERATING YOUR NEW GEOCOOL™ UNIT ELECTRIC SHOCK CAN KILL!! *Always protect yourself and others. *Always turn off system power before removing panels. Some units may have more than one or two power supplies. *Keep all covers and panels in place at all times. When removed for install or service purposes never leave the cover off when left unattended.
Locate the unit in an indoor area that allows for easy servicing (see image below). Make sure that the air filter access and unit access panels are easily accessible. Provide sufficient room to make all ground loop, well water, DHW, condensate, and electrical connections. If the unit is placed in a closet, make provision for adequate service access and proper return air flow to the unit. Some installations may require a condensate pump to take the condensate to a suitable drain location.
profile” and laid directly on the ceiling joist (code permitting). After being installed and wrapped in insulation, it is recommended the ductwork be covered with six to eight inches of cellulose. If the attic ductwork is not covered with cellulose it can lose a significant amount of its heating and cooling capacity into the attic area!! Ductwork that is inadequately insulated will cause poor system performance and customer dissatisfaction.
the importance of proper maintenance and the maintenance schedule for checking/changing the filter installed. Most air filters require monthly attention. 5.3 Construction / Remodeling The Geocool unit should NEVER be run during any kind of construction or remodeling that would allow drywall, hard wood, or any kind of dust to be pulled in the system. Even with extra filtering dust particles can accumulate in the duct system causing unwanted dust for years to come.
7.0 Open Loop Systems 7.
water chemicals which can cause build up and corrosion. The water source must be tested and treated before the installation of the Geocool unit. Failure to do so will void the warranty of the unit. Always maintain water pressure in the heat exchanger by placing the water control valve at the outlet of the unit to prevent deposit buildup. Use a closed, bladder-type expansion tank to minimize mineral formation due to air exposure. Insure proper water flow through the unit.
Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways. Discharge water should run outside with no restrictions to a discharge well, creek, pond, storm drain, etc. Discharge piping must be prepared in a manner that will not freeze. Most local codes forbid the use of sanitary sewer for disposal. Consult your local building and zoning departments to assure compliance in your area prior to discharging water. 7.
IMPORTANT!!! Once the tab has been removed, the unit will permanently be set to 20 degrees and cannot be reversed!! Removal of the tab on open loop systems or closed loop systems without minimal freeze protection will VOID all warranty on the unit! Page 16
8.0 Condensate Considerations Make provision for a condensate drain connection. Some installations require a condensate pump to take the condensate to a suitable drain. It’s common practice to install extra tees near the Geocool unit to allow access for pouring drain cleaner down the condensate drain. Insure all extra openings are capped off or are plugged. All Geocool vertical units have P-traps built internally in the units (see image below).
for severe water damage. A float switch is factory installed inside the Geocool® drain pan that when triggered by condensate backing up, will shut down the compressor and a RED status light labeled “CONDENSATE FAULT” will show up on the front panel display. The compressor will remain off and the light illuminated until the condensate clog has been cleared. 9.0 DHW Tank Preparation The DHW coil is a vented double-wall copper heat exchanger and is suitable for potable water.
9.2. Filling the Hot Water Tank Close boiler drain valves and the isolation valves to the Geocool system. Open the cold water supply feeding the DHW tank. Open a hot water tap in the building and allow air to bleed out of the tank. Alternatively you can depress lever on the tank relief valve to remove air trapped in the tank. Once the building plumbing is purged it is important to purge the air that is remaining in the Geocool system and plumbing between the hot water tank and the Geocool system.
The electrical box cover has a small tab that when rotated 90 degrees to a vertical position will allow the cover to swing downward on a hinge. 10.1 Main system Power Size all wire in accordance to local electrical code. Main power will land on top of the contactor, labeled “L1 and L2”. A green ground lug will also be provided for the ground wire. 10.2 Pump outputs A terminal strip will be provided for each pump or water valve output that applies. Each will be labeled as needed. 10.2.
11.0 Dallas™ Microprocessor The Dallas™ microprocessor combines simplicity with advanced controls to give the end user a range of options that can meet most install situations. With the LED indicator board, unit status can be easily checked by a technician and homeowner alike. 11.1 System Safeties The Dallas board has multiple built-in safety inputs that allows multiple levels of protection on the Geocool unit. 11.1.
11.1.2 Limit Switches The Dallas board has independent inputs for low limit and high limit switches. The auto-reset high limit switch is designed to trip at 550 psi and will shut the compressor down for 5 minutes after the switch resets. A RED light will blink on the LED board labeled “HIGH PRESSURE LIMIT” while the limit is tripped and will turn solid RED when the switch has reset. If the switch trips 3 times in any 30 minute period, the board will lock the compressor out.
The unit is equipped with a normally closed (N/C) float switch, factory installed in the unit’s internal drain pan. If the condensate line clogs, the float switch will be activated, shutting the compressor down and a RED light labeled “CONDENSATE FAULT” will be illuminated on the LED board. As soon as the pan drains, the light will go off and the compressor will be allowed to come back on. 11.
indicate the compressor is running, and 4 different RED lights to show fault status of High Pressure Limit Switch, Low Pressure Limit Switch, Freeze Protection, and Condensate Fault.
12.0 Dec-Star ECM Blower Variable Speed Blower: Geocool redefines comfort and efficiency by incorporating the new DecStar EMM Blower Motor Technology in our equipment. The variable speed blower coupled with the Dallas microprocessor provide: even temperatures throughout the space, better indoor air quality, precise humidity control, quieter operation and lower utility bills. 12.
13.1 Startup Checklist Verify the following items are addressed before starting the unit: • If closed loop system, loop and unit are purged of air and all valves are open. • Ensure a minimum of 20% methanol or 25% Propylene glycol is purged into the loop and properly mixed. • Ensure all piping is verified to provide designed flow rate and all valves are open. • If open loop system, well has pressure (25 PSI – 50 PSI) and all valves are open.
YOUR GEOCOOL WATER SOURCE HEAT PUMP HAS BEEN BUILT TO BE AS MAINTENANCE FREE AS POSSIBLE. THERE ARE ONLY A FEW THINGS YOU NEED TO DO TO KEEP YOUR SYSTEM RUNNING AS EFFICIENTLY AS POSSIBLE. IT’S STRONGLY RECOMMENDED TO HAVE THE UNIT CHECKED ONCE A YEAR BY A TRAINED SERVICE PROFESSIONAL. MANY INSTALLING DEALERS OFFER PREVENTATIVE MAINTENANCE CHECKS. WARNING! BEFORE PERFORMING SERVICE OR MAINTENANCE ON SYSTEM, TURN OFF ALL BREAKERS. ELECTRICAL SHOCK CAN CAUSE PERSONAL INJURY OR DEATH.
water tank for proper procedures. • During your annual preventative maintenance check, inspect the drain pans for debris to avoid condensate tubing blockage. Tubing needs to be checked at both ends to ensure blockage doesn’t clog up the pipe from the inside or outside of the house if exposed. In areas where algae produce a slime in the drain pan, it may be necessary to chemically treat the problem. • Geocool units are equipped with controllers that allow for a system lock out feature.
Water around base of unit: 1. Water leak. Find and repair leak. 2. Condensation pan not draining. Check for restriction, clean pan and blow out pipe. 3. Air coil freezing. Check for dirty air filter, dirty air coil, or restriction in ductwork. Noisy operation 1. Defective fan motor/blower housing. Repair or replace blower. 2. Defective compressor. Replace compressor. 3. Refrigeration line vibration. Reposition and secure. 4. Foreign material in blower housing. Clean blower housing. 5.
Refrigerant pressure operating too high or locking out on high limit 1. Unit running in cooling: 1.1. Too little water flow. Check loop pump including fuse on closed loop units or check well pressure and water temperatures for open loop units. 1.2. Bad high limit switch. Replace limit switch. 1.3. Unit overcharged. Adjust refrigerant charge. 2. Unit running in heating: 2.1. Clogged air filter. Replace filter. 2.2. Dirty air coil. Clean air coil. 2.3. Bad high limit switch. Replace limit switch. 2.4.
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