NSKW Installation Manual NSKW 06 to 17 kW Geothermal Hydronic Heat Pump - 50 Hz Installation Information Water Piping Connections Electrical Data Startup Procedures Preventive Maintenance Certificate Number NQA ‘00000027’ Factory Standard MCS010 Product Standard MCS007 IM1066WN 03/12
NSKW INSTALLATION MANUAL Table of Contents Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 BS EN 14511-2 Performance Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NSKW INSTALLATION MANUAL Model Nomenclature 1-4 NSKW 5-6 08 7 R 8 6 9 0 10 2 11 C 12 C 13-14 SS Model NSKW = Envision Series 50Hz Hydronic Heat Pump 15 A Vintage A = Current Future Option SS = Standard Option Capacity (kW Output) 06 08 12 17 Load Coax 2 C = Copper N = Cupronickel Operation H = Heating Only R = Reversible Source Coax C = Copper N = Cupronickel Voltage 6 = 220-240/50/1 7 = 380-420/50/3 Controls Option 2 = Standard Board 4 = FX10 without interface 5 = FX10 with N2 card without
NSKW INSTALLATION MANUAL BS EN 14511-2 Performance Ratings Heating Performance B0/W35 W10/W35 B0/W45 B5/W35 W10/W45 Model Capacity Output kW COP Power Input kW Capacity Output kW COP Power Input kW Capacity Output kW COP Power Input kW Capacity Output kW COP Power Input kW Capacity Output kW COP Power Input kW 06 5.80 3.80 1.53 7.30 4.80 1.52 5.50 2.90 1.90 6.60 4.30 1.54 7.10 3.70 1.92 08 8.30 4.20 1.98 10.6 5.30 2.00 8.00 3.20 2.50 9.50 4.80 1.98 10.2 4.
NSKW INSTALLATION MANUAL General Installation Information Safety Considerations WARNING: To avoid equipment damage, do not leave the system filled in a building without heat during cold weather, unless adequate freeze protection levels of antifreeze are used. Heat exchangers do not fully drain and will freeze unless protected, causing permanent damage. Installing and servicing air conditioning and heating equipment can be hazardous due to system pressure and electrical components.
NSKW INSTALLATION MANUAL Dimensional Data A C T S Q N P R I B Z E U W L K V M Model 06 08 12 17 cm. cm. cm. cm. B C Depth Height Width 59.7 78.7 78.7 78.7 66.3 66.5 66.5 66.5 49.5 55.9 55.9 55.9 M Model 06 08 12 17 Load Liquid In cm. cm. cm. cm. 6.1 4.1 4.6 4.6 N Load Liquid Out 6.1 7.0 9.1 10.2 6/18/09 Electrical Knockouts J K L 1/2 in. 3/4 in. 3/4 in. cond cond cond Water Connections A O D E F Load Liquid In 25.4 5.3 5.6 6.1 Load Liquid Out 56.4 49.8 52.3 58.
NSKW INSTALLATION MANUAL Water Quality General building’s piping system that the designer may need to take into consideration when deciding the parameters of the water quality. NSKW heat pumps may be successfully applied in a wide range of residential and light commercial applications. It is the responsibility of the system designer and installing contractor to ensure that acceptable water quality is present and that all applicable codes have been met in these installations.
NSKW INSTALLATION MANUAL Field Connected Water Piping General Each unit is equipped with captive female pipe thread (FPT) water connections to eliminate ‘egg-shaping’ from use of a backup wrench. For making the water connections to the unit, a Teflon tape thread sealant is recommended to minimize internal fouling of the piping. Do not over tighten connections. All supply and return water piping should be insulated to prevent excess condensation from forming on the water lines. to determine the flow rate.
NSKW INSTALLATION MANUAL Field Connected Water Piping cont. Typical Closed Loop Earth Coupled Installation well, storm sewer, drain field, adjacent stream or pond, etc.). Most local codes restrict the use of sanitary sewer for disposal. Consult your local building and zoning departments to ensure compliance in your area.
NSKW INSTALLATION MANUAL Potable Water Systems cont.
NSKW INSTALLATION MANUAL Potable Water Systems cont. Alternate Hot Water Installation with Direct Coupling to a Double Wall Unit LOOP FIELD HOT COLD Dielectric Unions FLOW CENTER Dielectric Unions P/T Ports Ball Valve P/T Ports Ball Valve WaterFurnace GEOTANK WaterFurnace NSKW06 (Heating Only) with Double Wall Load Coax NOTES: 1) Unions and valves must be installed so that acid flushing of the heat exchanger is possible. 2) Make sure there is not a check valve in the diptube of the tank.
NSKW INSTALLATION MANUAL Hydronic Section Pressure Reducing Valves or Feed Water Valves General guidelines are shown below for component selection and design/installation criteria for the piping system. Local codes supersede any recommendations in this manual. This valve lowers the pressure from the make-up water line to the system. Most are adjustable and directional. A “fast fill” valve is required for initial filling of the system. Some have screens, which must be cleaned after the initial filling.
NSKW INSTALLATION MANUAL Hydronic Section cont. WaterFurnace Geothermal Storage Tank Thermostat and Thermistor Open the screw 2 turns only in the end of the pump motor (if Grundfos® pumps are used) to allow trapped air to be discharged and to ensure the motor housing has been flooded. Route thermistor wires to NSKW. Remove yellow thermistor wires on TB 3 and 4 from control box and connect thermistor wires from geothermal storage tank.
NSKW INSTALLATION MANUAL Accessories and Options Geo Storage Tank Dimensions 30° 30° To Geo 150 cm Dip Tube From Geo PRIMARY ANODE 99 cm - 80 Gallon 106.7 cm - 119 Gallon 20.3 cm HOT OUTLET w/35.6 cm SECONDARY ANODE COLD INLET 132.0 cm DIP TUBE Approx. 2.54 cm Yellow Wire attached to Thermistor or Thermostat for Top Exit T&P VALVE Element Location HEIGHT Lower Sensor Thermistor (12P541-01) to be used by Water to Water Units 90.8 cm Optional “From Geo” Connection 13.
NSKW INSTALLATION MANUAL Electrical Data Model 06 08 12 17 Rated Voltage Voltage Min/Max MCC RLA Compressor LRA LRA* Load Pump FLA Source Pump FLA Total Unit FLA Min Circ Amp Max Fuse/ HACR 220-240/50/1 198/264 17.0 10.9 58.0 20.0 1.5 4.5 16.9 19.6 30 380-420/50/3 342/462 7.0 4.5 26.0 - - - 4.5 5.6 10 220-240/50/1 198/264 27.0 17.3 97.0 34.0 1.5 4.5 23.3 27.6 40 380-420/50/3 342/462 10.0 6.4 45.0 - - - 6.4 8.0 10 220-240/50/1 198/264 31.5 20.
NSKW INSTALLATION MANUAL Electrical Data cont. Electrical Be sure the available power is the same voltage and phase as that shown on the unit serial plate. Line and low voltage wiring must be done in accordance with local codes or the 17th Edition IEE Wiring Regulations, whichever is applicable. Refer to the Electrical Data table for wire and fuse or circuit breaker sizing information. NSKW Control Box Relocation The control box can be installed on the rear of the unit.
NSKW INSTALLATION MANUAL Wiring Schematics Heating Only - 240/50/1 Compressor S External External G C Blue G R Red Load Pump T1 NOTE 2 T2 T1 Tan T2 SFB LFB L1 L2 L1 Black Cap Source Pump Unit Power Supply 208-240/50/1 T1 T2 L2 CC Blue/Wht Brown/Blk L2 L1 G Brown/Wht LPR Brown Blue Blue 240V Green/Yellow Red 208V Black Com NOTE 1 PS1 B C D Transformer Red 24V Black Black/ White Yellow 24 V Black White/Blue ELT 3 4 5 6 7 Orange 8 9 10 11 C Microprocessor Control
NSKW INSTALLATION MANUAL Wiring Schematics cont.
NSKW INSTALLATION MANUAL Wiring Schematics cont.
5) NSKW INSTALLATION MANUAL Wiring Schematics cont. Reversible - 380-420/50/3 cont. TB Field Connection Diagram (For units using Set Point control mode with or without a secondary unit.) Red 380V NOTE 1 NOTE 5 NOTE 6 Transformer Blue 420V PB1 24VAC 24V COM LV Load Valve Output Load Flow Proving Switch LF X2 Acc 2 Primary Load Over-ride Input POI X1 Acc 1 Rev Valve L Alarm Source Flow Proving Switch To Primary Load Over-ride Input (POI) of secondary unit.
NSKW INSTALLATION MANUAL Heat Pump Control IntelliStart® NSKWs come with a factory installed control board that is capable of receiving commands from the internal controller provided with the heat pump. An alternative method is to control the heat pump using an external field supplied Aquastat or thermostat that will turn the compressor on/off based on leaving water temperature. The optional IntelliStart single phase soft starter will reduce the normal start current (LRA) by 60%.
NSKW INSTALLATION MANUAL External Control Primary Mode Secondary Mode In dedicated heating or cooling units, the unit is controlled by the internal controller. Compressor output is determined by the entering load-side water temperature. In dedicated heating or cooling units, secondary mode allows the unit to be controlled by an external source. Compressor output is determined by the Y1 input only. The secondary output will be energized if two conditions occur: 1.
NSKW INSTALLATION MANUAL External Control cont. Staging with Primary/Secondary Mode Wiring for Primary/Secondary Unit Staging Secondary Unit (SL=1) Primary Unit (SL=0) Staging is only possible with dedicated heating or cooling units. Reversible units cannot be staged. Staging can be accomplished with primary/secondary modes or by using an aquastat.
NSKW INSTALLATION MANUAL Converting to a Dedicated Cooling Unit Procedure to Convert a Heating Only Unit to a Cooling Only Unit 13. Open the control box. 14. Find the connection marked “P4” as shown in the Control Board with Jumper illustration. 15. Move the “P4” jumper from across 1 and 2 to across 2 and 3. 16. Close the control box and secure the screws. 17. Replace the top and access panel. 18. Make sure all screws have been re-installed. 19. Turn on the power. 20.
NSKW INSTALLATION MANUAL Unit Startup Before Powering Unit 8. Press the down arrow on the keypad to reduce the set point below the incoming load temperature. Compressor should shut off and the load pump should shut off 30 seconds after the compressor. 9. Wait 7 minutes. The load pump should start to sample load temperature. 10. Compressor and source side circulator should not start. 11.
NSKW INSTALLATION MANUAL Standard Board - Control Features Anti Short Cycle Time selected, the control will respond immediately to a recognized call or termination of call for heat or cool subject to minimum run times and anti short cycle delays. The anti short cycle time consists of a three minute minimum “off” time plus a randomly chosen 0-2 minute additional “off” delay. The random delay is chosen by the control after each compressor shut down.
NSKW INSTALLATION MANUAL Standard Board - Control Features cont. No-Retry Faults High Temperature, Water Temperature Probe Open, Water Temperature Probe Closed and Brown Out faults prevent compressor operation for the duration of the fault. If the fault activity ceases while the system is inactive, the fault code is cleared from the display and operation is permitted.
NSKW INSTALLATION MANUAL Standard Control - Panel Configuration Control Panel The control panel allows you to access the service menu on the unit.
NSKW INSTALLATION MANUAL Standard Control - Panel Configuration cont. Remote Aquastat Secondary Mode (Y1) In secondary mode the compressor output is determined by an external aquastat. The compressor shall engage 10 seconds after the Y1 call has been received. The compressor shall de-activate 10 seconds after the Y1 has been removed. The secondary output is controlled by a Derivative Controller.
NSKW INSTALLATION MANUAL Optional Controls FX10 Control The most unique feature is integrating the FX10 into the Envision Series as both the heat pump and DDC controller providing both a cost advantage and providing features not typically found on WLHP controls.
NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. FX10 Advanced Control Overview • The Johnson Controls FX10 board is specifically designed for commercial heat pumps and provides control of the entire unit as well as input ports for Open N2, LonTalk, BACnet (MS/TP @ 19,200 Baud Rate) communication protocols as well as an input port for a user interface. The user interface can be used to aid in diagnostics and unit setup and is optional on all NSKW units.
NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. FX10 Microprocessor and BAS System DDC Operation and Connection Other optional network protocol boards that can be added to the FX10 are: • Johnson Control N2 • LonWorks • BACnet - MS/TP @ 19,200 Baud rate - Limit devices to 30 on a single trunk line. Control and Safety Feature Details Emergency Shutdown The emergency shutdown mode can be activated by a command from a facility management system or a closed contact on BI-2.
NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. Freeze Detection Sequence of Operation The freeze detection sensor will monitor the liquid refrigerant temperature entering the water coil in the heating mode. If the temperature drops below the freeze detection trip point for the recognition delay period, the condition will be recognized as a fault. The freeze detection trip point will be factory set for -1.1°C and will be field selectable for -9.
NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. Inputs and Outputs Configuration Control Accessories Field Selectable Options • A99 Sensor • MUI (LCD User interface) for diagnostics and commissioning • MUIK3 - Panel Mount, Portable • MUIK4 - Wall Mount Load and Source Freeze Detection Setpoint The freeze detection setpoint input allows you to adjust the freeze detection setpoint for either the load or source sides of the heat pump.
NSKW INSTALLATION MANUAL Reference Calculations Heating Calculations: LWT = EWT - HE L/s x 4.2* Pressure Drop Cooling Calculations: LWT = EWT + Model HR L/s x 4.2* NOTE: * When using water. Use 4.1 for 15% methanol/water or Environol solution. 06 08 12 17 L/s Pressure Drop (kPa) 0°C 15°C 25°C 35°C 50°C 0.25 6.2 4.8 4.1 3.4 2.8 0.35 13.8 13.1 12.4 11.7 10.3 0.45 22.1 20.7 20.0 19.3 17.9 0.55 30.3 29.0 27.6 26.2 25.5 0.30 6.2 4.1 3.9 3.7 3.4 0.45 15.9 14.
NSKW INSTALLATION MANUAL Flow Rates Source Flow Rates (L/S) Model Load Flow Rates (L/S) Minimum Open Loop Minimum Closed Loop Normal Maximum 06 0.25 0.30 0.45 08 0.30 0.50 0.65 12 0.50 0.75 1.00 17 0.65 0.90 1.20 Minimum Normal Maximum 0.60 0.25 0.45 0.60 0.75 0.30 0.65 0.75 1.10 0.50 1.00 1.10 1.30 0.60 1.20 1.30 2/14/12 Thermistor Resistance Thermistor Temperature (°C) Resistance (Ohms) 26.0 9,230 - 10,007 25.3 9,460 - 10,032 24.7 9,690 - 10,580 24.
NSKW INSTALLATION MANUAL Operating Parameters Heating Mode Entering Load Temp (°C) 15 25 35 50 Entering Source Temp (°C) Suction Pressure (kPa) Discharge Pressure (kPa) Superheat (°C) Subcooling (°C) -15 358-462 1344-1565 4-9 3-8 0 462-565 1434-1620 4-8 3-8 10 655-779 1489-1689 4-8 3-7 20 855-993 1551-1758 4-11 3-8 30 986-1151 1586-1896 8-14 4-7 -15 372-476 1951-2179 4-9 4-8 0 476-579 2020-2227 6-7 4-10 10 676-862 2082-2310 7-8 4-9 20 834-1020 2144-2386
NSKW INSTALLATION MANUAL Antifreeze Correction Catalog performance can be corrected for antifreeze use. Please use the following table and note the example given. Antifreeze Type Ethylene Glycol Propylene Glycol Ethanol Methanol Cooling Load 26.7 -1.1 10.0 32.2 -1.1 0 1.000 1.000 1.000 1.000 1.000 1.075 EWT - °C Water Heating Antifreeze % by wt Source Load Source Pressure Drop 10 0.990 0.973 0.976 0.991 20 0.978 0.943 0.947 0.979 1.163 30 0.964 0.917 0.921 0.965 1.
NSKW INSTALLATION MANUAL Troubleshooting Guideline for Refrigerant Circuit The chart below will assist in determining if measurements taken at the unit are within factory specifications and aid in accurate diagnosis (SYMPTOM) and repair. The chart is general in nature and represents whether a symptom would result in normal, high, or low readings from the typical operating range.
NSKW INSTALLATION MANUAL Heating Cycle Analysis ______kPa = ______SAT°C ______°C Suction RV Load Coax Compressor Source Coax Discharge FD ______kPa = ______SAT°C ______°C ______°C Liquid Line Entering Source Water °C Entering Water Pressure kPa Leaving Source Water Leaving Water Pressure Unit Amp Draw Line Voltage Loop: Entering Load Water Open °C Closed kPa °C Entering Load Water Pressure Subcooling Leaving Load Water Superheat Leaving Load Water Pressure kPa °C kPa NOTE: Do not
NSKW INSTALLATION MANUAL Startup and Troubleshooting Form Company Name: _________________________________ Technician Name: ________________________________ Model No: ______________________________________ Owner’s Name: __________________________________ Installation Address: ______________________________ Company Phone No: ______________________________ Date: __________________________________________ Serial No:_______________________________________ Open or Closed Loop: _____________________________ Inst
NSKW INSTALLATION MANUAL Troubleshooting Should a major problem develop, refer to the following information for possible causes and corrective steps: 9. The internal winding of the compressor motor may be grounded to the compressor shell. If so, replace the compressor. 10. The compressor winding may be open. Check continuity with an ohm meter. If the winding is open, replace the compressor. Compressor Won’t Run 1. The fuse may be blown or the circuit breaker is open.
NSKW INSTALLATION MANUAL Troubleshooting cont. Troubleshooting Controls Check the jumpers on the control board: Check the unit. If a lockout mode is displayed, refer to the table below to determine the meaning of the failure. Follow the procedure listed to correct the problem. 1. Refer to the Control Board with Jumper illustration in the Converting to a Dedicated Cooling Unit section to see the location of the jumper on the board. If the unit is a heating only unit, the jumper should be across 1 and 2.
NSKW INSTALLATION MANUAL Preventive Maintenance 1. Keep all air out of the water lines. An open loop system should be checked to ensure that the well head is not allowing air to infiltrate the water line. Lines should always be airtight. 2. Keep the system under pressure at all times. In open loop systems, it is recommended that a water control valve be placed in the discharge line to prevent loss of pressure during off cycles. Closed loop systems must have a positive static pressure. 4.
NSKW INSTALLATION MANUAL Service Parts Part Description Refrigeration Components 06 08 12 17 Compressor 220-240/50/1 34P568-06 34P621-02 34P580-02 34P614-02 380-420/50/3 34P568-08 34P621-04 34P580-04 34P614-04 Compressor Capacitor 220-240/50/1 16P002D20 16P002D36 16P002D39 16P002D36 Compressor Sound Jacket 92P504A05 92P519-01 92P519-02 92P519-02 Thermal Expansion Valve 33P605-18 33P605-10 33P605-17 33P605-17 Filter Drier for ‘Reversible Models’ 36P500B01 36P500B01 36P500B0
Manufactured by WaterFurnace International, Inc. 9000 Conservation Way Fort Wayne, IN 46809 www.waterfurnace.com Product: Type: Size: Document: Envision NSKW Geothermal Hydronic Heat Pump - 50 Hz 06-17 kW Installation Manual Certificate Number NQA ‘00000027’ Factory Standard MCS010 Product Standard MCS007 ©2012 WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794.
