GT-PC Series (50YGV, 50YGH, 50YGD Models) Installation, Operation and Maintenance Instructions Residential Digital Vertical, Horizontal & Downflow Packaged Geothermal Heat Pumps 97B0046N06 Rev.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 General Information Inspection Upon receipt of the equipment, carefully check the shipment against the bill of lading. Make sure all units and accessories have been received. Inspect the packaging of each unit, and inspect each unit for damage.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Vertical Installation Vertical Unit Location Packaged units are not designed for outdoor installation. Locate the unit in an INDOOR area that allows enough space for service personnel to perform typical maintenance or repairs without removing the unit from the installed location. Vertical units are typically installed in a mechanical closet or basement.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Horizontal Installation Horizontal Unit Location Packaged units are not designed for outdoor installation. Locate the unit in an INDOOR area that allows enough space for service personnel to perform typical maintenance or repairs without removing unit from the ceiling. Horizontal units are typically installed in an attic or crawl space.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Horizontal Installation Field Conversion of Air Discharge Overview - Horizontal units can be field converted between side (straight) and back (end) discharge using the instructions below.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Condensate and Water Connection Condensate Piping Pitch the unit toward the drain as shown in Figure 5 to improve the condensate drainage. On small units (less than 2.5 tons/8.8 kW), insure that unit pitch does not cause condensate leaks inside the cabinet.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Integrated Variable-Speed Water Flow Control Heat Pump Applications Overview Integrated Variable Speed Water Flow Control is a revolutionary new, intelligent, and efficient way to circulate water (or water plus antifreeze) using INTERNAL, variable water flow control.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Closed Loop Heat Pump Applications with Internal Flow Controller Units with internal flow control come with built-in variable speed pumps, an expansion tank, flushing ports and a three way valve (used to flush the unit). The variable speed pump is controlled by the Communicating DXM2 board based on the difference between the entering and leaving water temperature (ΔT).
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Flushing the Earth Loop Once piping is completed between the unit and the ground loop, final purging and charging of the loop is needed. A flush cart (at least a 1.5 hp [1.1kW] pump) is needed to achieve adequate flow velocity in the loop to purge air and dirt particles from the loop itself. Antifreeze solution is used in most areas to prevent freezing.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Flushing the Earth Loop Figure 15b: Valve Position B - Unit Fill / Flush NOTICE: Actual flushing time require will vary for each installation due to piping length, configuration, and flush cart pump capacity. 3/8” or less fluid level drop is the ONLY indication that flushing is complete. Switch valves to Position B to flush the unit.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Flushing the Earth Loop the flush cart from the Internal Flow Controller. Install Flow Controller caps to ensure that any condensation/leakage remains contained within the Flow Controller package. If the loop pressure is between 50 and 75 psi [345 to 517 kPa] upon completion of flushing, pressures should be sufficient for all seasons.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Multiple Unit Piping and Flushing Often projects require more than one heat pump. Where possible, it makes sense for multiple units to share a common ground loop. Common ground loops for multiple units bring new challenges including the need to avoid backward flow through inactive units, increased pumping requirements, and more complex flushing needs.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Multiple Unit Piping and Flushing Again, flush the loop through the internal flushing valves. This is important as there may be air/debris in the lines from this unit to the common piping. Once flushing begins the air will be move into the loop and will need to be flushed out.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Multiple Unit Piping and Flushing Multiple Units with Internal Modulating Valves and Central Pump This is an application where multiple units are used in conjunction with a central, variable speed pump. In this case, units with closed loop modulating valves are used (do not use open loop modulating valves on a closed loop system). External flushing valves are required.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Ground Loop Applications Antifreeze Selection - General In areas where minimum entering loop temperatures drop below 40°F [4.4°C] or where piping will be routed through areas subject to freezing, antifreeze is needed. Alcohols and glycols are commonly used as antifreeze solutions. Your local representative should be consulted for the antifreeze best suited to your area.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Ground Loop Applications Chart 1a: Methanol Specific Gravity Specific Gravity 1.000 0.995 0.990 0.985 0.980 0.975 0.970 0.965 0.960 -50°F -40°F -30°F -20°F -10°F 0°F 10°F 20°F 30°F 40°F 50°F -45.6°C -34.4°C -23.3°C -12.2°C -1.1°C 10°C -40°C -28.9°C -17.8°C -6.7°C 4.4°C Low Temperature Protection Chart 1b: Propylene Glycol Specific Gravity 1.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Open Loop or Ground-Water Applications flushing is complete, press the lock release again and return the valve handle to its normally closed position.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Open Loop or Ground-Water Applications The pump should be sized to handle the home’s domestic water load (typically 5-9 gpm [23-41 l/m]) plus the flow rate required for the heat pump. Pump sizing and expansion tank must be chosen as complimentary items. For example, an expansion tank that is too small can cause premature pump failure due to short cycling.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Water Quality Requirements Table 5: Water Quality Requirements Water Quality Parameter HX Material Closed Recirculating Open Loop and Recirculating Well Scaling Potential - Primary Measurement Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below pH/Calcium Hardness Method All - pH < 7.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Hot Water Generator The HWG (Hot Water Generator) or desuperheater option provides considerable operating cost savings by utilizing heat energy from the compressor discharge line to help satisfy domestic hot water requirements.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Hot Water Generator Installation The HWG is controlled by two sensors and the DXM2 microprocessor control. One sensor is located on the compressor discharge line to sense the discharge refrigerant temperature. The other sensor is located on the HWG heat exchanger’s “Water In” line to sense the potable water temperature.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Hot Water Generator WARNING! WARNING! The HWG pump Is fully wired from the factory.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Electrical - Line Voltage WARNING! WARNING! To avoid possible injury or death due to electrical shock, open the power supply disconnect switch and secure it in an open position during installation. CAUTION! CAUTION! Use only copper conductors for field installed electrical wiring. Unit terminals are not designed to accept other types of conductors.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Electrical - Low Voltage Wiring Figure 26: GT-PC Low Voltage Field Wiring Table 9: Accessory Relay 2 Configuration DIP 2.4 DIP 2.5 DIP 2.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Electrical - Thermostat Wiring Thermostat Installation The thermostat should be located on an interior wall in a larger room, away from supply duct drafts. DO NOT locate the thermostat in areas subject to sunlight, drafts or on external walls.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 DXM2 Wiring Diagram with Internal Flow Controller - 96B0005N60 Part 1 of 2 This diagram includes typical wiring details but is not applicable to all units. For specific unit wiring, refer to the diagram or the units’ control panel.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 DXM2 Wiring Diagram with Motorized Modulating Water Valve 96B0005N62 - Part 1 of 2 This diagram includes typical wiring details but is not applicable to all units. For specific unit wiring, refer to the diagram or the units’ control panel.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 ECM Blower Control The ECM fan is controlled directly by the DXM2 control board that converts thermostat inputs and CFM settings to signals used by the ECM motor controller. To take full advantage of the ECM motor features, a Two-Way Unit Communicating System communicating multi-stage thermostat should be used (ATC32U**).
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 ECM Blower Performance Data Table 10: GT-PC (50YG) Series ECM Blower Performance Data Table Airflow in CFM with wet coil and clean air filter Cooling Mode Dehumid Mode Heating Mode Stg 2 Stg 2 Stg 2 Model Max ESP (in. wg) Fan Motor (hp) Range Default 700 525 550 425 750 600 350 850 026 1.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 DXM2 Controls DXM2 Controller DXM2 is the next generation in controls and is capable of 2-way communication with smart components, like the communicating thermostat, ECM fan motor, Magna Variable-Speed Pump and configuration/ diagnostic tool. DIP Switches – There’s no need to change the DIP switches settings on Residential units.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 DXM2 Layout and Connections Figure 31: LT1 Limit Setting Low Water Temperature Cutout Selection The DXM2 control allows the field selection of low water (or water-antifreeze solution) temperature limit by clipping jumper JW3, which changes the fault cutout temperature associated with thermistor LT1.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Unit Commissioning and Operating Conditions Operating Limits Environment – Units are designed for indoor installation only. Never install units in areas subject to freezing or where humidity levels could cause cabinet condensation (such as unconditioned spaces subject to 100% outside air). Power Supply – Voltage utilization shall comply with unit data plate.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Unit Start-Up and Operating Conditions Unit and System Checkout BEFORE POWERING SYSTEM, please check the following: UNIT CHECKOUT Shutoff valves: Insure that all isolation valves are open. Line voltage and wiring: Verify that voltage is within an acceptable range for the unit and wiring and fuses/ breakers are properly sized. Verify that low voltage wiring is complete.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Unit Start-Up Procedure SERVICE MODE a. Go into Manual Mode activate Y1, and Y2 for Heating. Also manually increase CFM until desired heating CFM is achieved. Next adjust pump speed % until desired loop temperature difference (entering water temperature minus leaving water temperature) is achieved. (For modulating valve adjust valve %). b.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Unit Start-Up Procedure If performance during any mode appears abnormal, refer to the DXM2 section or troubleshooting section of this manual. NOTE: To obtain maximum performance, the air coil should be cleaned before start-up. A 10% solution of dishwasher detergent and water is recommended.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Table 17a: Performance Data — GT-PC Model 026- Full Load Performance capacities shown in thousands of Btuh Antifreeze use recommended in this range. Also Clip JW3 on DXM2 board. Cooling - EAT 80/67°F EWT °F GPM 20 30 40 50 60 70 80 90 100 110 120 1.3 1.3 1.7 1.7 1.7 1.7 1.7 1.7 2.2 2.2 2.2 2.2 2.2 2.2 3.0 3.0 3.3 3.3 3.3 3.3 3.0 3.0 4.5 4.5 6.0 6.0 3.0 3.0 4.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Table 17b: Performance Data — GT-PC Model 038 - Full Load Performance capacities shown in thousands of Btuh Antifreeze use recommended in this range. Also Clip JW3 on DXM2 board. Cooling - EAT 80/67°F EWT °F GPM 20 30 40 50 60 70 80 90 100 110 120 2.0 2.0 2.5 2.5 2.5 2.5 2.5 2.5 3.4 3.4 3.4 3.4 3.4 3.4 4.5 4.5 5.1 5.1 5.1 5.1 4.5 4.5 6.8 6.8 9.0 9.0 4.5 4.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Table 17c: Performance Data — GT-PC Model 049 - Full Load Performance capacities shown in thousands of Btuh Antifreeze use recommended in this range. Also Clip JW3 on DXM2 board. Cooling - EAT 80/67°F EWT °F GPM 20 30 40 50 60 70 80 90 100 110 120 2.6 2.6 3.3 3.3 3.3 3.3 3.3 3.3 4.4 4.4 4.4 4.4 4.4 4.4 6.0 6.0 6.5 6.5 6.5 6.5 6.0 6.0 9.0 9.0 12.0 12.0 6.0 6.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Table 17d: Performance Data — GT-PC Model 064 - Full Load Performance capacities shown in thousands of Btuh Antifreeze use recommended in this range. Also Clip JW3 on DXM2 board. Cooling - EAT 80/67°F EWT °F GPM 20 30 40 50 60 70 80 90 100 110 120 3.4 3.4 4.2 4.2 4.2 4.2 4.2 4.2 5.7 5.7 5.7 5.7 5.7 5.7 7.5 7.5 8.5 8.5 8.5 8.5 7.5 7.5 11.3 11.3 15.0 15.0 7.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Table 17e: Performance Data — GT-PC Model 072 - Full Load Performance capacities shown in thousands of Btuh Antifreeze use recommended in this range. Also Clip JW3 on DXM2 board. Cooling - EAT 80/67°F EWT °F GPM 20 30 40 50 60 70 80 90 100 110 120 3.7 3.7 4.7 4.7 4.7 4.7 4.7 4.7 6.2 6.2 6.2 6.2 6.2 6.2 8.5 8.5 9.3 9.3 9.3 9.3 8.5 8.5 12.8 12.8 17.0 17.0 8.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Preventive Maintenance Water Coil Maintenance (Direct ground water applications only) - If the system is installed in an area with a known high mineral content (125 P.P.M. or greater) in the water, it is best to establish a periodic maintenance schedule with the owner so the coil can be checked regularly.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Troubleshooting General If operational difficulties are encountered, perform the preliminary checks below before referring to the troubleshooting charts. • Verify that the unit is receiving electrical supply power. • Make sure the fuses in the fused disconnect switches are intact.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Troubleshooting Outputs The compressor and reversing valve relays are 24VAC and can be verified using a voltmeter. For units with ECM blower motors, the DXM2 controls the motor using serial communications, and troubleshooting should be done with a communicating thermostat or diagnostic tool.
R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 DXM2 Process Flow Chart WARNING! WARNING! HAZARDOUS VOLTAGE! DISCONNECT ALL ELECTRIC POWER INCLUDING REMOTE DISCONNECTS BEFORE SERVICING. Failure to disconnect power before servicing can cause severe personal injury or death.
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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P C S e r i e s - 6 0 H z P u r o n ® R e v. : 1 4 J u n e , 2 0 1 3 Revision History Page # 14 June, 13 All Figure and Table Numbers Corrected 1 Oct., 12 All First Published Description R AI BR I HE AT P U M P S A TO NE WATER TO IFIED TO ARI A RT S C CE NG WITH LYI MP O IR MANUFACT UR ER Date IS O ST AND 3 ARD 1 ISO 9001:2008 Certified -1 R 25 6 Quality: First & Always 7300 S.W.
