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Summary of Contents for Envision NSKW 06
- Page 1 NSKW 06 to 17 kW Geothermal Hydronic Heat Pump - 50 Hz Installation Information Water Piping Connections Electrical Data Startup Procedures Preventive Maintenance IM1066WN 05/15...
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Page 2: Table Of Contents
NSKW INSTALLATION MANUAL Table of Contents Model Nomenclature............4 BS EN 14511-2 Performance Ratings . -
Page 3: Model Nomenclature
NOTES: Hot Water Generation (HWG) only available on NSKW12-17 and requires a field installed external pump - 06 heating only models are available only with copper double wall vented load coax. All Envision Series NSKW product is safety tested to CE standards and performance tested in accordance with standard BS EN 14511-2. -
Page 4: Bs En 14511-2 Performance Ratings
NSKW INSTALLATION MANUAL BS EN 14511-2 Performance Ratings Heating Performance B0/W35 W10/W35 B0/W45 B5/W35 W10/W45 Capacity Power Capacity Power Capacity Power Capacity Power Capacity Power Model Output Input Output Input Output Input Output Input Output Input 5.80 3.80 1.53 7.30 4.80 1.52 5.50... -
Page 5: General Installation Information
NSKW INSTALLATION MANUAL General Installation Information WARNING: To avoid equipment damage, do not Safety Considerations leave the system filled in a building without heat Installing and servicing air conditioning and heating during cold weather, unless adequate freeze equipment can be hazardous due to system pressure and protection levels of antifreeze are used. -
Page 6: Dimensional Data
NSKW INSTALLATION MANUAL Dimensional Data NOTE: Plastic front panel extends 3.56 cm beyond front of cabinet. NOTE: Plastic front panel extends 1.4" (3.56 cm) beyond front of cabinet. 8/09/13 Electrical Knockouts Overall Cabinet Water Connections 1/2 in. 3/4 in. 3/4 in. Model cond cond... -
Page 7: Water Quality
NSKW INSTALLATION MANUAL Water Quality building’s piping system that the designer may need to take General into consideration when deciding the parameters of the NSKW heat pumps may be successfully applied in a wide water quality. range of residential and light commercial applications. It is the responsibility of the system designer and installing If an antifreeze or water treatment solution is to be used, contractor to ensure that acceptable water quality is... -
Page 8: Field Connected Water Piping
NSKW INSTALLATION MANUAL Field Connected Water Piping General to determine the flow rate. These ports should be located adjacent to the supply and return connections on the unit. Each unit is equipped with captive female pipe thread (FPT) The proper flow rate cannot be accurately set without water connections to eliminate ‘egg-shaping’... -
Page 9: Potable Water Systems
Installations must meet minimum requirements outlined in local electrical and plumbing codes are met for installing a hot UK Domestic Heating Compliance Guide. water generator. The Envision NSKW is not supplied with an internal circulator. CAUTION: Hot water in excess of 60°C can cause... - Page 10 NSKW INSTALLATION MANUAL Potable Water Systems cont. Suggested Domestic Water Heater Hookup 207 kPa Pressure RELIEF VALVE Gauge Vent LOAD PUMP HYDRONIC Vent Valve or LOAD P/T Port** Separator Back Flow Preventer / Expansion Pressure Relief Valve Tank Dielectric COLD Unions (Piped in series to...
- Page 11 NSKW INSTALLATION MANUAL Potable Water Systems cont. Alternate Hot Water Installation with Direct Coupling to a Double Wall Unit LOOP FIELD COLD Dielectric Unions FLOW CENTER Dielectric Unions Ports Ports Ball Valve Ball Valve WaterFurnace WaterFurnace GEOTANK NSKW06 (Heating Only) with Double Wall Load Coax NOTES: 1) Unions and valves must be installed so that acid flushing...
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Page 12: Hydronic Section
A buffer tank is required for all hydronic heating systems Antifreeze is required if any of the piping system is located using Envision NSKW heat pumps. The tank should be sized in areas subject to freezing. to provide 2 gallons [7.6 L] of storage capacity for every 300W of nominal heat pump capacity. -
Page 13: Hydronic Section
NSKW INSTALLATION MANUAL Hydronic Section cont. Open the screw 2 turns only in the end of the pump motor WaterFurnace Geothermal Storage Tank Thermostat ® and Thermistor (if Grundfos pumps are used) to allow trapped air to be discharged and to ensure the motor housing has been flooded. -
Page 14: Accessories And Options
NSKW INSTALLATION MANUAL Accessories and Options Geo Storage Tank Dimensions From Geo To Geo 150 cm Dip Tube PRIMARY ANODE 99 cm - 80 Gallon 106.7 cm - 119 Gallon 20.3 cm HOT OUTLET COLD INLET w/35.6 cm SECONDARY ANODE 132.0 cm DIP TUBE Approx. -
Page 15: Electrical Data
NSKW INSTALLATION MANUAL Electrical Data Compressor Load Source Total Rated Voltage Model Pump Pump Unit Circ Fuse/ Voltage Min/Max LRA* HACR 220-240/50/1 198/264 17.5 11.2 60.0 24.0 17.2 20.0 380-420/50/3 342/462 28.0 16.8 220-240/50/1 198/264 27.0 17.3 97.0 34.0 23.3 27.6 380-420/50/3 342/462... - Page 16 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.
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Page 17: Wiring Schematics
NSKW INSTALLATION MANUAL Wiring Schematics Heating Only - 240/50/1 Compressor External External Blue Black Load Source Pump Pump Unit NOTE 2 Power Supply 208-240/50/1 Blue/Wht Brown/Blk Brown/Wht Brown Blue Blue Black 240V Green/Yellow 208V NOTE 1 Transformer Black Black/ Yellow White 24 V Black/Gry... - Page 18 NSKW INSTALLATION MANUAL Wiring Schematics cont. NSKW Reversible with IntelliStart - 240/50/1 Compressor External External Blue Run Winding IntelliStart Pink Active Load Source Pump Pump Start Blue Black Black Common Black Unit NOTE 2 Power Supply 208-240/50/1 Brown/Blk Blue/Wht Brown/Wht Brown Blue Blue...
- Page 19 NSKW INSTALLATION MANUAL Wiring Schematics cont. Reversible - 380-420/50/3 Compressor Blue Black Unit Power Supply 380-420/50/3 Blk/Wht (69) Yellow (68) Green/Yellow (67) 5VDC Black (20) Black (40) Brown (41) Brown (42) Black (19) White (43) Wht/Blu (44) Black (38) Black (18) Black (45) Black (37) Blk/Red (46)
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Page 20: Wiring Schematics
NSKW INSTALLATION MANUAL Wiring Schematics cont. Reversible - 380-420/50/3 cont. Field Connection Diagram (For units using Set Point control mode with or without a secondary unit.) Red 380V NOTE 6 NOTE 1 NOTE 5 Transformer Black 24VAC 24V COM Blue Load Flow Load Valve Output Proving Switch... -
Page 21: Heat Pump Control
NSKW INSTALLATION MANUAL Heat Pump Control NSKWs come with a factory installed control board that is IntelliStart ® capable of receiving commands from the internal controller The optional IntelliStart single phase soft starter will reduce provided with the heat pump. An alternative method is the normal start current (LRA) by 60%. -
Page 22: External Control
NSKW INSTALLATION MANUAL External Control Primary Mode Secondary Mode In dedicated heating or cooling units, the unit is controlled In dedicated heating or cooling units, secondary mode by the internal controller. Compressor output is determined allows the unit to be controlled by an external source. by the entering load-side water temperature. -
Page 23: External Control
NSKW INSTALLATION MANUAL External Control cont. Wiring for Primary/Secondary Unit Staging Staging with Primary/Secondary Mode 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. -
Page 24: Converting To A Dedicated Cooling Unit
NSKW INSTALLATION MANUAL Converting to a Dedicated Cooling Unit Procedure to Convert a Heating Only Unit to a 13. Open the control box. Cooling Only Unit 14. Find the connection marked “P4” as shown in the Control Board with Jumper illustration. All non-reversible NSKW units are built at the factory as 15. -
Page 25: Unit Startup
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. Check the following: Compressor should shut off and the load pump should • High voltage wiring is correct and matches the shut off 30 seconds after the compressor. -
Page 26: Standard Board - Control Features
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 The anti short cycle time consists of a three minute subject to minimum run times and anti short cycle delays. -
Page 27: Standard Board - Control Features
NSKW INSTALLATION MANUAL Standard Board - Control Features cont. No-Retry Faults Freeze Detection Probe Closed (dC) High Temperature, Water Temperature Probe Open, Compressor and pump operation will be disabled when Water Temperature Probe Closed and Brown Out faults the control senses that the freeze detection probe is prevent compressor operation for the duration of the closed or has no resistance. -
Page 28: Standard Control - Panel Configuration
NSKW INSTALLATION MANUAL Standard Control - Panel Confi guration The control panel allows you to access the service menu Control Panel on the unit. The control panel has three 7-segment LED screens that display the: • Water temperature • Configuration menu There are six (6) LED indicators that indicate when the SECONDARY OUTPUT is active or the unit is on one of the following modes:... - Page 29 NSKW INSTALLATION MANUAL Standard Control - Panel Confi guration 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.
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Page 30: Optional Controls
Optional Controls FX10 Control The most unique feature is integrating the FX10 into the Envision Series as both the heat pump and DDC controller The FX10 control provides unparalleled capability providing both a cost advantage and providing features in several areas including performance monitoring, not typically found on WLHP controls. - Page 31 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.
- Page 32 NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. DDC Operation and Connection FX10 Microprocessor and BAS System 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.
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Page 33: Sequence Of Operation
NSKW INSTALLATION MANUAL Optional Controls - FX10 cont. Freeze Detection Sequence of Operation The freeze detection sensor will monitor the liquid Power Fail Restart refrigerant temperature entering the water coil in the When the controller is first powered up, the outputs will heating mode. - Page 34 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 Load and Source Freeze Detection Setpoint commissioning The freeze detection setpoint input allows you to •...
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Page 35: Reference Calculations
NSKW INSTALLATION MANUAL Reference Calculations Pressure Drop Heating Calculations: Cooling Calculations: Pressure Drop (kPa) Model 0°C 15°C 25°C 35°C 50°C LWT = EWT - LWT = EWT + L/s x 4.2* L/s x 4.2* 0.25 0.35 13.8 13.1 12.4 11.7 10.3 NOTE: * When using water. -
Page 36: Flow Rates
NSKW INSTALLATION MANUAL Flow Rates Source Flow Rates (L/S) Load Flow Rates (L/S) Model Minimum Open Minimum Closed Normal Maximum Minimum Normal Maximum Loop Loop 0.25 0.30 0.45 0.60 0.25 0.45 0.60 0.30 0.50 0.65 0.75 0.30 0.65 0.75 0.50 0.75 1.00 1.10... -
Page 37: Operating Parameters
NSKW INSTALLATION MANUAL Operating Parameters Heating Mode Entering Entering Suction Discharge Superheat Subcooling Load Temp (°C) Source Temp (°C) Pressure (kPa) Pressure (kPa) (°C) (°C) 358-462 1344-1565 462-565 1434-1620 655-779 1489-1689 855-993 1551-1758 4-11 986-1151 1586-1896 8-14 372-476 1951-2179 476-579 2020-2227 4-10 676-862... -
Page 38: Antifreeze Correction
NSKW INSTALLATION MANUAL Antifreeze Correction Catalog performance can be corrected for antifreeze use. Please use the following table and note the example given. Heating Cooling Antifreeze % Pressure Antifreeze Type by wt Drop Load Source Load Source EWT - °C 26.7 -1.1 10.0... -
Page 39: Troubleshooting Guideline For Refrigerant Circuit
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. -
Page 40: Heating And Cooling Cycle Analysis
NSKW INSTALLATION MANUAL Heating Cycle Analysis ______kPa = ______SAT°C ______°C Suction Compressor Load Source Discharge Coax Coax ______kPa = ______SAT°C ______°C ______°C Liquid Line Entering Source Water °C Entering Water Pressure Leaving Source Water °C Leaving Water Pressure Unit Amp Draw Line Voltage Entering Load Water °C... -
Page 41: Startup And Troubleshooting Form
NSKW INSTALLATION MANUAL Startup and Troubleshooting Form Company Name: _________________________________ Company Phone No: ______________________________ Technician Name: ________________________________ Date: __________________________________________ Model No: ______________________________________ Serial No:_______________________________________ Owner’s Name: __________________________________ Open or Closed Loop: _____________________________ Installation Address: ______________________________ Installation Date: _________________________________ Check One Start up/Check-out for new installation Troubleshooting Problem:___________________________________... -
Page 42: Troubleshooting
NSKW INSTALLATION MANUAL Troubleshooting Should a major problem develop, refer to the following 9. The internal winding of the compressor motor may be information for possible causes and corrective steps: grounded to the compressor shell. If so, replace the compressor. 10. - Page 43 NSKW INSTALLATION MANUAL Troubleshooting cont. Check the jumpers on the control board: Troubleshooting Controls Refer to the Control Board with Jumper illustration in Check the unit. If a lockout mode is displayed, refer to the the Converting to a Dedicated Cooling Unit section to table below to determine the meaning of the failure.
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Page 44: Preventive Maintenance
NSKW INSTALLATION MANUAL Preventive Maintenance Keep all air out of the water lines. An open loop system 4. Connect a plastic hose from the circulating pump inlet should be checked to ensure that the well head is not to the bottom of a plastic five (5) gallon pail (refer to allowing air to infiltrate the water line. -
Page 45: Service Parts
NSKW INSTALLATION MANUAL Service Parts Part Description Compressor 220-240/50/1 34P583-02 34P621-02 34P580-02 34P614-02 380-420/50/3 34P583-04 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 36P500B02... - Page 46 Revision Table Pages: Description: Date: Updated Nomenclature, Electric Heating Data, Service Parts List and Physical Data 05 May 2015 Revision table added 05 May 2015...
- Page 47 Manufactured by WaterFurnace International, Inc. 9000 Conservation Way Fort Wayne, IN 46809 www.waterfurnace.com Product: Envision NSKW Type: Geothermal Hydronic Heat Pump - 50 Hz Size: 06-17 kW Document: Installation Manual ©2015 WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794. WaterFurnace has a policy...
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