Envision NSKW 06, NSKW 08, NSKW 12, NSKW 17 Installation Manual

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Page 1

NSKW 06 to 17 kW

Geothermal Hydronic Heat Pump - 50 Hz

Installation Information

Water Piping Connections

Electrical Data

Startup Procedures

Preventive Maintenance

NSKW Installation Manual

IM1066WN 05/15

Page 2

Table of Contents

Model Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

BS EN 14511-2 Performance Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Dimensional Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

NSKW INSTALLATION MANUAL

Water Quality

Field Connected Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10

Potable Water Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12

Hydronic Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14

Accessories and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-17

Wiring Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-21

Heat Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

External Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-24

Converting to a Dedicated Cooling Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Unit Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Standard Board - Control Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27-28

Standard Control - Panel Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-30

Optional Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-35

Reference Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Pressure Drop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Flow Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Thermistor Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Operating Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Antifreeze Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Troubleshooting Guideline for Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Heating and Cooling Cycle Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Startup and Troubleshooting Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43-44

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Service Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Page 3

NSKW INSTALLATION MANUAL

Model Nomenclature

1-4

NSKW

Model

NSKW = Envision Series 50Hz Hydronic Heat Pump

Capacity (kW Output)

06 08 12 17

Operation

H = Heating Only R = Reversible

Voltage

6 = 220-240/50/1 7 = 380-420/50/3

Hot Water Option

0 = No Hot Water Generation, No IntelliStart 2 = Hot Water Generation, No IntelliStart (12-17) 3 = No Hot Water Generation, IntelliStart 5 = Hot Water Generation, IntelliStart (12-17)

7R869010211C12C13-14SS15

5-6

Vintage

A = 08-17 B = 06

Future Option

SS = Standard Option

Load Coax C = Copper N = Cupronickel

Source Coax

C = Copper N = Cupronickel

Controls Option

2 = Standard Board 4 = FX10 without communication 5 = FX10 with Open N2 Com Card 6 = FX10 with LonWorks card Com Card 7 = FX10 with BACnet Com card 8 = FX10 without communication, with User Interface 9 = FX10 with Open N2 Com Card, with User Interface 0 = FX10 with Lonworks Com card, with User Interface 3 = FX10 with BACnet Com card, with User Interface

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

Heating Performance

B0/W35 W10/W35 B0/W45 B5/W35 W10/W45

Capacity

Model

All ratings based upon 220V operation All ratings based on new heat pump with clean heat exchangers

Output

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

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 4.10 2.49

COP

11.6 4.20 2.80 14.4 5.30 2.72 11.3 3.20 3.53 13.3 4.80 2.77 14.2 4.10 3.46

16.6 3.70 4.49 21.4 4.70 4.55 15.9 2.90 5.50 19.0 4.30 4.42 20.4 3.70 5.51

Cooling Performance

Model

All ratings based upon 220V operation All ratings based on new heat pump with clean heat exchangers

Capacity

Output kW

4.00 2.80 1.43 5.90 4.10 1.44 8.10 5.60 1.45

6.10 3.00 2.03 9.00 4.40 2.05 12.4 6.00 2.07

8.20 2.90 2.82 12.0 4.30 2.80 16.6 5.80 2.86

11.2 2.60 4.30 16.4 3.80 4.32 22.7 5.20 4.37

Power

Capacity

Input

W30/B0 W30/W12 W30/W23

EER (W/W)

Output

COP

Power Input kW Capacity

Power

Capacity

Input

Output kW

Output

COP

EER (W/W)

Power

Capacity

Input

Output

Power Input kW Capacity

COP

Output kW

NSKW INSTALLATION MANUAL

Power

Input

Capacity

Output

EER (W/W)

COP

Power

Input

9/26/11

Power Input

9/26/11

Legend

ABBREVIATIONS AND DEFINITIONS:

COP = coefficient of performance EER = cooling energy efficiency (TC/kW) ELT = entering load fluid temperature EST = entering source fluid temperature to heat pump FLA = full load amps FtHd = pressure drop in feet of head gpm = US gallon per minute HC = heating capacity in kW HE = heat of extraction in kW HR = heat rejected in kW kPa = kilopascal kW = kilowatt

CONVERSIONS:

x°F = (x - 32)/1.8°C 1 bar = 100 kPa 1 gpm = 0.0631 L/s

L/s = liters per second LLT = leaving load fluid temperature from heat pump LRA = locked rotor amps (starting current) LST = leaving source fluid temperature from heat pump LWPD = load heat exchanger water pressure drop MCC = maximum continuous current PD = pressure drop psi = pressure drop in pounds per square inch P/T = Pressure/Temperature RLA = run load amps TC = total cooling capacity in kW W = Watt

1 US Gallon = 3.785412 L 1 Btu/h = 0.29037 W

Page 5

NSKW INSTALLATION MANUAL

General Installation Information

Safety Considerations

Installing and servicing air conditioning and heating equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair or service heating and air conditioning equipment. When working on heating and air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available for all brazing operations.

NOTE: Before installing, check voltage of unit(s) to ensure proper voltage.

WARNING: Before performing service or maintenance operations on the system, turn off main power switches to the unit. Electrical shock could cause serious personal injury.

Process Water Applications

For process water applications, it is recommended that a secondary load heat exchanger be installed to prevent corrosion to the unit’s primary coaxial coil. In situations where scaling could be heavy or where biological growth such as iron bacteria will be present, a closed loop system is recommended. Over a period of time, ground water unit heat exchanger coils may lose heat exchange capability due to a buildup of mineral deposits. These can be cleaned only by a qualified service mechanic as special pumping equipment and solutions are required.

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.

Unit Location

Provide sufficient room to make water and electrical connections. If the unit is located in a confined space, provisions must be made for unit servicing. Locate the unit in an indoor area that allows easy removal of the access panels and has enough space for service personnel to perform maintenance or repair. These units are not approved for outdoor installation and, therefore, must be installed inside the structure being conditioned. Do not locate units in areas subject to freezing conditions.

WARNING: Do not store or install units in corrosive environments or in locations subject to temperature or humidity extremes (e.g. attics, garages, rooftops, etc.). Corrosive conditions and high temperature or humidity can significantly reduce performance, reliability, and service life.

Mounting Units

Units should be mounted level on a vibration absorbing pad slightly larger than the base to provide isolation between the unit and the floor. It is not necessary to anchor the unit to the floor. Allow access to the front, back, and side access panels for servicing.

Moving and Storage

Move units in the normal “Up” orientation as indicated by the labels on the unit packaging. When the equipment is received, all items should be carefully checked against the bill of lading to ensure that all crates and cartons have been received in good condition. Examine units for shipping damage, removing unit packaging if necessary to properly inspect unit. Units in question should also be internally inspected. If any damage is observed, the carrier should make the proper notation on delivery receipt acknowledging the damage. Units are to be stored in a location that provides adequate protection from dirt, debris and moisture.

DWP`ObW]\>OR;]c\bW\U

Page 6

Dimensional Data

NSKW INSTALLATION MANUAL

NOTE: Plastic front panel extends 3.56 cm beyond front of cabinet.

Overall Cabinet Water Connections

Model

06 08

12 17

Model

06 08

12 17

NOTE: Plastic front panel extends 3.56 cm beyond front of cabinet.

ABCDE FGH I

Depth Height Width

cm. 59.7 66.3 49.5 25.4 56.4 25.4 56.4 - - 25.4 mm 25.4 mm - 4 0.6 3 6.1 36 .1 cm. 78.7 66.5 55.9 5.3 49.8 5.3 49.8 60.7 60.7 25.4 mm 25.4 mm 12.7 mm 43.4 37.6 43.4 cm. 78.7 66.5 55.9 5.6 52.3 5.6 52.3 60.7 60.7 31.8 mm 31.8 mm 12.7 mm 43.4 37.6 43.4 cm. 78.7 66.5 55.9 6.1 58.4 6.1 58.4 52.3 52.3 31.8 mm 31.8 mm 12.7 mm 43.4 37.6 43.4

MNOP QR S T UVWXYZ

Load

Liquid In

cm. 6.1 6.1 6.1 6.1 - - 8.9 7.4 37.8 6.6 5.3 4.4 7.4 10.4 cm. 4.1 7.0 7.0 4.1 5.1 4.6 12.2 12.2 43.4 7.0 37.8 12.2 12.2 43.4 cm. 4.6 9.1 9.1 4.6 5.3 4.6 12.2 12.2 43.4 7.1 37.8 12.2 12.2 43.4 cm. 4.6 10.2 10.2 4.6 10.7 3.6 12.2 12.2 43.4 7.1 37.8 12.2 12.2 43.4

Load

Liquid

Out

Source

Liquid In

Load

Liquid

Source Liquid

Load

Liquid

Out

Water Connections Electrical Knockouts

HWG In

Out

Source

Liquid

HWG

Out

Source

Liquid

Out

Power

Supply

HWG In

Voltage

Low

HWG

Out

Load

Water

Side

Power

Supply

FPT

Side

Power

Supply

Source

Water

FPT

Pump

HWG

Water

FPT

Ext

8/09/13NOTE: Plastic front panel extends 1.4" (3.56 cm) beyond front of cabinet.

Electrical Knockouts

JKL

1/2 in.

cond

Low

Voltage

Ext

Pump

3/4 in.

Power

Supply

cond

Ext

Pump

3/4 in.

cond

Power

Supply

Power

Supply

8/6/10

Physical Data

Model 06 08 12 17

Compressor (1 each) Scroll

Factory Charge R410A, oz [kg] 58 [1.64] 70 [1.98] 68 [1.93] 110 [3.12] Coax & Piping Water Volume - gal [l]* 0.89 [3.38] 1.0 [3.94] 1.4 [5.25] 1.6 [6.13] Weight - Operating, lb [kg] 225 [102.1] 290 [131.5] 325 [147.4] 345 [156.5] Weight - Packaged, lb [kg] 247 [112.0] 305 [138.3] 340 [154.2] 360 [163.3]

Note: * Source or load side only 3/25/15

Page 7

NSKW INSTALLATION MANUAL

Water Quality

General

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. Failure to adhere to the guidelines in the

building’s piping system that the designer may need to take into consideration when deciding the parameters of the water quality.

If an antifreeze or water treatment solution is to be used, the designer should confirm it does not have a detrimental effect on the materials in the system.

water quality table could result in loss of warranty.

Contaminated Water

Water Treatment

Do not use untreated or improperly treated water. Equipment damage may occur. The use of improperly treated or untreated water in this equipment may result in scaling, erosion, corrosion, algae or slime. The services of a qualified water treatment specialist should be engaged to determine what treatment, if any, is required. The product warranty specifically excludes liability for corrosion, erosion or deterioration of equipment.

The heat exchangers and water lines in the units are copper or cupronickel tube. There may be other materials in the

Water Quality Guidelines

Material Copper 90/10 Cupronickel 316 Stainless Steel

pH Acidity/Alkalinity

Scaling

Corrosion

Iron Fouling

(Biological Growth)

Erosion

NOTES: Grains = ppm divided by 17

mg/L is equivalent to ppm

Calcium and

Magnesium Carbonate

Hydrogen Sulfide

Sulfates Less than 125 ppm Less than 125 ppm Less than 200 ppm Chlorine Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm

Chlorides Less than 20 ppm Less than 125 ppm Less than 300 ppm

Carbon Dioxide Less than 50 ppm 10 - 50 ppm 10 - 50 ppm

Ammonia Less than 2 ppm Less than 2 ppm Less than 20 ppm

Ammonia Chloride Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm

Ammonia Nitrate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm

Ammonia Hydroxide Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm

Ammonia Sulfate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm

Total Dissolved Solids (TDS) Less than 1000 ppm 1000 - 1500 ppm 1000 - 1500 ppm

LSI Index +0.5 to -0.5 +0.5 to -0.5 +0.5 to -0.5

Iron, FE

Bacterial Iron Potential

Iron Oxide

Suspended Solids

Threshold Velocity

(Fresh Water)

+ (Ferrous)

Less than 0.5 ppm (rotten egg

smell appears at 0.5 ppm)

Less than 1 ppm, above this

level deposition will occur

Less than 10 ppm and filtered

for max. of 600 micron size

7 - 9 7 - 9 7 - 9

(Total Hardness)

less than 350 ppm

< 0.2 ppm < 0.2 ppm < 0.2 ppm

< 1.8 m/sec < 1.8 m/sec < 1.8 m/sec

In applications where the water quality cannot be held to prescribed limits, the use of a secondary or intermediate heat exchanger is recommended to separate the unit from the contaminated water.

The following table outlines the water quality guidelines for unit heat exchangers. If these conditions are exceeded, a secondary heat exchanger is required. Failure to supply a secondary heat exchanger where needed will result in a warranty exclusion for primary heat exchanger corrosion or failure.

(Total Hardness)

less than 350 ppm

10 - 50 ppm Less than 1 ppm

Less than 1 ppm, above this

level deposition will occur

Less than 10 ppm and filtered

for max. of 600 micron size

(Total Hardness)

less than 350 ppm

Less than 1 ppm, above this

level deposition will occur

Less than 10 ppm and filtered

for max. of 600 micron size

2/22/12

Page 8

Field Connected Water Piping

NSKW INSTALLATION MANUAL

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.

NOTES: 1) WaterFurnace recommends a male national pipe thread (NPT) to British standard pipe fitting (BSPF) to adapt to NSKW water connections. 2) Units are factory runtested using propylene glycol. Prior to connecting piping to unit, thoroughly flush heat exchangers.

The piping installation should provide service personnel with the ability to measure water temperatures and pressures. The water lines should be routed so as not to interfere with access to the unit. The use of a short length of high pressure hose with a swivel type fitting may simplify the connections and prevent vibration. Optional stainless steel hose kits are available as an accessory item.

Before final connection to the unit, the supply and return hose kits must be connected, and the system flushed to remove dirt, piping chips and other foreign material. Normally, a combination balancing and close-off (ball) valve is installed at the return, and a rated gate or ball valve is installed at the supply. The return valve can be adjusted to obtain the proper water flow. The valves allow the unit to be removed for servicing.

The proper water flow must be delivered to each unit whenever the unit heats or cools. To assure proper flow, the use of pressure/temperature ports is recommended

to determine the flow rate. These ports should be located adjacent to the supply and return connections on the unit. The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerantto-water heat exchanger (See Pressure Drop Table for water flow and pressure drop information). Normally about 0.054 L/s per kW flow rate of cooling capacity (0.040 L/s per kW minimum) is needed. Both source as well as load fluid piping must be at least as large as the unit connections on the heat pump (larger on long runs).

Never use flexible hoses of a smaller inside diameter than that of the water connection on the unit and limit hose length to

3.05 m per connection. Check carefully for water leaks.

CAUTION: Water piping exposed to outside temperature may be subject to freezing.

Open Loop Well Water Systems

Always maintain water pressure in the heat exchanger by placing water control valves at the outlet of the unit. Use a closed bladder type expansion tank to minimize mineral deposits. Ensure proper water flow through the unit by checking pressure drop across the heat exchanger and comparing it to the figures in the pressure drop table. Normally, about 0.038 L/s per kW flow rate of cooling capacity is needed in open loop systems, 0.029 L/s per kW minimum if entering source temperature is above 10°C.

Some water control valves draw their power directly from the unit’s 24V transformer and can overload and possibly burn out the transformer. Check total VA draw of the water valve(s) and ensure it is under 40 VA.

Discharge water from a heat pump can be disposed of in various ways depending on local building codes (i.e. recharge

Typical Open Loop Installation

Line Voltage Disconnect

Load Liquid

Connections

Shut-off Valve

(to isolate solenoid

valve while acid

flushing)

Rubber Bladder

Expansion Tank

Flow Regulator Valve

Solenoid

Valve

Boiler Drains for HX Flushing

P/T Plugs

Vibration Absorbing Mesh or Air Pad

Water Out

Water In

Shut-off Valve

NOTE: Valves and boiler drains must be installed so the heat exchanger can be acid flushed.

Page 9

NSKW INSTALLATION MANUAL

Field Connected Water Piping cont.

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.

Earth Coupled Systems with Flow Center

Once piping is completed between the unit, flow center and the earth loop, final purging and charging of the loop is needed. A pump capable of 14 m

/hr @ 25 meters of head 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. Maintain the pH in the 7.6-8.2 range for final charging.

Flush the system adequately to remove as much air as possible. Then, pressurize the loop to a static pressure of 345-517 kPa. This is normally adequate for good system operation. Ensure that the flow center provides adequate flow through the unit by checking pressure drop across the heat exchanger and by comparing it to the figures shown in the Pressure Drop tables. Usually, 0.054 L/s per kW or minimum 0.040 L/s per kW of cooling capacity is needed in closed loop earth-coupled applications.

Ground Loop Design and Installation

This instruction manual does not cover the design and installation of the ground loop system. WaterFurnace recommends that all ground loops are designed using

Typical Closed Loop Earth Coupled Installation

Earth Coupled Loop

Piping with Insulation

Line Voltage Disconnect

Unit Connector Kits

with Insulation

P/T Plugs

Vibration Absorbing Mesh or Air Pad

GeoLink

Load Liquid

Connections

Design Studio (GDS) or another commercial software package. Installers shall follow the guidelines detailed in Microgeneration Certification Scheme (MCS) Installation Standard MIS 3005 for designing ground loop collectors. Additional guidance on ground collectors is provided by International Ground-Source Heat Pump Association (IGSHPA).

Potable Water Systems

NSKW06-17 kW heat pumps can be equipped with a double-wall vented coaxial heat exchanger capable of hot water generation (HWG). An optional factory-installed hot water generator coil may be provided with NSKW08-17. The temperature of the hot water produced by the heat pump cannot be adjusted and will vary with the inlet temperature. WaterFurnace recommends the use of a properly sized buffer tank equipped with supplemental electric immersion heaters in conjunction with all NSKW models used in an HWG application. Immersion heaters must be capable of heating the water to 60°C at a regular time interval to prevent the build-up of bacteria such as Legionella. Installations must meet minimum requirements outlined in UK Domestic Heating Compliance Guide.

CAUTION: Hot water in excess of 60°C can cause scalding.

Hot Water Generator Connections

The heat reclaiming hot water generator coil is vented double-

wall copper construction and is suitable for potable water. To maximize the benefits of the hot water generator a minimum 50-gallon water heater is recommended. For higher demand applications, use an 80-gallon water heater as shown below or two 50-gallon water heaters connected in a series. A geo storage tank should not be used in this application unless it is plumbed in a series with an electric water heater. The geo storage tank is equipped with a single 4500 Watt element and will not be able to provide adequate water heating if used as a standalone water heater. Electric water heaters are recommended. Make sure all local electrical and plumbing codes are met for installing a hot water generator. The Envision NSKW is not supplied with an internal circulator.

Page 10

Potable Water Systems cont.

Suggested Domestic Water Heater Hookup

207 kPa

RELIEF VALVE

Back Flow Preventer /

Pressure Relief Valve

Pressure

Gauge

Vent

Expansion

Tank

Air

Separator

LOAD PUMP

NSKW INSTALLATION MANUAL

HYDRONIC

LOAD

Vent Valve or

P/T Port**

Dielectric

Unions

GEO

STORAGE

TANK

Dip Tube

Dielectric

Unions

Ball Valve

NOTES: * A 207 kPa pressure relief valve (Part No: SRV30) should be used in

hydronic applications. ** Vent valve or Pressure/Temperature port at highest point in return line prior to ball valve.

NOTES:

1) Unions and valves must be installed so that acid flushing of the heat exchanger is possible.

2) 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. Set the pump sampling (PS) in the set up of the control board to continuously (C) sampling (reference Note 5 in the Wiring Schematic).

P/T

Ports

Ball Valve

FROM

HWG

WaterFurnace

NSKW Series

PUMP

Source OUT

P/T Ports

Source IN

HOT

(Piped in

series to

an electric

water heater)

COLD

DOMESTIC

Page 11

NSKW INSTALLATION MANUAL

Potable Water Systems cont.

Alternate Hot Water Installation with Direct Coupling to a Double Wall Unit

Dielectric

Unions

HOT

COLD

LOOP FIELD

FLOW CENTER

Dielectric

Unions

Ball Valve

WaterFurnace

GEOTANK

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.

3) 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. Set the pump sampling (PS) in the set up of the control board to continuously (C) sampling (reference Note 5 in the Wiring Schematic).

P/T

Ports

Ball Valve

WaterFurnace

NSKW06 (Heating Only)

with Double Wall Load Coax

P/T Ports

Page 12

Hydronic Section

NSKW INSTALLATION MANUAL

General guidelines are shown below for component selection and design/installation criteria for the piping system. Local codes supersede any recommendations in this manual.

Shut Off/Flow Regulation Valves

Use full port ball valves or gate valves for component isolation. If valves are going to be used frequently, ball valves are recommended. Globe valves are designed for flow regulation. Always install globe valves in the correct direction (fluid should enter through the lower body chamber).

Check valves

Swing check valves must be installed in the horizontal position with the bonnet of the valve upright. Spring check valves can be mounted in any position. A flow check valve is required to prevent thermo-siphoning (or gravity flow) when the circulator pump is off or when there are two circulators on the same system.

Storage (Buffer) Tank

A buffer tank is required for all hydronic heating systems

using Envision NSKW heat pumps. The tank should be sized to provide 2 gallons [7.6 L] of storage capacity for every

300W of nominal heat pump capacity.

Pressure Relief Valve

Most codes require the use of a pressure relief valve if a closed loop heat source can be isolated by valves. Even if local code does not require this device, WaterFurnace recommends its installation. If the pressure relief valve in the buffer tank is not already rated at 207 kPa maximum pressure, one must be installed. The pressure relief valve should be tested at start up for operation. Note that the waste pipe must be at least the same diameter as the valve outlet (never reduce), and valves may not be added to this pipe. The bottom of the pipe must terminate at least 15 cm above the floor. If the piping is connected to a drain, there must be an air gap.

Pressure Reducing Valves or Feed Water Valves

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. If there is a restriction in the screen, the system could go to 0 kPa, potentially causing pumps(s) failure. A valve should be installed on each side of the pressure reducing valve for servicing. Both valves should have tags reading “Do not shut this valve under normal operation – service valve only.”

Expansion Tanks

Expansion tanks are required on hydronic systems to help absorb the pressure swings as the temperature in the system fluctuates.

Elbows/Tees

Long radius elbows or two 45° elbows will lower pressure drop. Standard tees have a greater restriction on the “T” portion than tees designed with angled outlet ports.

Antifreeze

Antifreeze is required if any of the piping system is located

in areas subject to freezing.

Dielectric Unions

Dielectric unions are recommended whenever connecting two dissimilar metals to one and other to prevent electrogalvanic corrosion.

When using the various types of hydronic heat distribution

systems, the temperature limits of the geothermal system must be a major consideration. In new construction, the distribution system can easily be designed with the temperature limits in mind. In retrofits, care must be taken to address the operating temperature limits of the existing distribution system. The maximum storage tank temperature for the Envision NSKW is 54.4°C. Typical in floor radiant systems require much lower temperatures, typically 37.8°-46.1°C, which is ideal for the Envision NSKW.

Backflow Prevention Check Valves

Most codes require backflow prevention check valves. Note that a single check valve is not equal to a backflow prevention check valve. Even if local code does not require this device, WaterFurnace recommends its installation. This is particularly important if the system will use antifreeze.

Page 13

NSKW INSTALLATION MANUAL

Hydronic Section cont.

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. Set the pump sampling (PS) in the set up of the control board to continuously (C) sampling (reference Note 5 in the Wiring Schematic).

Adequate rate of flow is very important to system performance and long term reliability. Follow the guidelines for recommended flow and pipe sizing in the NSKW recommendations table.

207 kPa

RELIEF VALVE

Back Flow Preventer /

Pressure Relief Valve

Pressure

Gauge

Air

Vent

Expansion

Tank

WaterFurnace Geothermal Storage Tank Thermostat and Thermistor

NSKW

Yellow Thermistor Wires Connected to TB (3 and 4) on NSKW Control Board

LOAD PUMP

Air

Separator

HYDRONIC

LOAD

Vent Valve or

P/T Port**

Dielectric

Unions

GEO

STORAGE

TANK

Dip Tube

Dielectric

Unions

Ball Valve

NOTES: * A 207 kPa pressure relief valve (Part No: SRV30) should be used in

hydronic applications. ** Vent valve or Pressure/Temperature port at highest point in return line prior to ball valve.

Ball Valve

P/T

Ports

FROM

HWG

WaterFurnace

NSKW Series

PUMP

Source OUT

P/T Ports

Source IN

HOT

(Piped in

series to

an electric

water heater)

COLD

DOMESTIC

Page 14

Accessories and Options

Geo Storage Tank Dimensions

NSKW INSTALLATION MANUAL

From Geo

PRIMARY ANODE 99 cm - 80 Gallon

106.7 cm - 119 Gallon

HOT OUTLET

w/35.6 cm SECONDARY ANODE

Approx. 2.54 cm

T & P

VALVE

HEIGHT

90.8 cm

To Geo 150 cm Dip Tube

20.3 cm

COLD INLET

132.0 cm DIP TUBE

Yellow Wire attached to Thermistor or Thermostat for Top Exit

Element Location

Lower Sensor Thermistor (12P541-01) to be used by Water to Water Units

Optional “From Geo” Connection

13.3 cm

Model

Number

GEO-STORAGE-80

GEO-STORAGE-120

DRAIN VALVE

Gallon [Liter]

Capacity

80 [303] 4500 1 16 160.6 61.0 92.5

119 [450] 4500 1 16 160.6 71.1 141.1

Element

Wattage

(240 Volt)

DIAMETER

Number

Elements

Value

Lower Thermostat

Dimensions in cm

Height Diameter

Approx Shipping

Weight kg

Page 15

NSKW INSTALLATION MANUAL

Electrical Data

Model

Notes:

* - With optional IntelliStart, Type D MCB recommended

NSKW Control Box

Optional IntelliStart

(Single Phase Only)

Rated

Voltage

220-240/50/1 198/264 17.5 11.2 60.0 24.0 1.5 4.5 17.2 20.0 30

380-420/50/3 342/462 6.5 4.2 28.0 16.8 - - 4.2 5.3 6

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 27.0 - - 6.4 8.0 10

220-240/50/1 198/264 31.5 20.2 126.0 44.0 1.5 4.5 26.2 31.2 50

380-420/50/3 342/462 12.1 7.8 51.5 31.0 - - 7.8 9.8 15

220-240/50/1 198/264 45.0 29.0 130.0 46.0 1.5 4.5 35.0 42.3 70

380-420/50/3 342/462 19.0 12.2 87.0 52.0 - - 12.2 15.3 25

Voltage

Min/Max

MCC RLA LRA LRA*

Compressor

Load

Pump

FLA

Source

Pump

FLA

Total

Unit FLA

Terminal Board

Terminal Power Strip

Min

Circ

Amp

Max Fuse/ HACR

1/15/15

Power Block

(IntelliStart Only)

Compressor Contactor

Run Capacitor

(Single Phase Only)

Ground Lug

Transformer

Load Pump Relay

Power Block

Reversing Valve Relay (Reversible Units Only)

Source Pump Relay

Page 16

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. To relocate the control box, follow the procedures below.

1. Remove all power sources to the unit.

2. Remove the unit’s top panel.

3. Cut all plastic wire ties to the following: a) High pressure switch (black wires)

b) Low pressure switch (blue wires)

c) Freeze sensing (yellow wires)

d) Load temperature sensor (black wires) e) Compressor wires

4. Remove the four screws from the control box.

5. Relocate the control box to opposite end of the unit.

6. Using the screws removed in step 4 above, reattach the control box.

7. Secure all wires so they do not come in contact with refrigerant lines.

8. Replace the top of the unit.

9. Replace both access panels.

10. Reapply power sources.

NSKW INSTALLATION MANUAL

NOTE: If geothermal storage tank is used, connect yellow thermistor wires from the bottom access panel of the tank to spade connectors 3 and 4 on the terminal block.

Page 17

NSKW INSTALLATION MANUAL

Wiring Schematics

Heating Only - 240/50/1

External

Load

Pump

NOTE 2

LFB

L2 L2L1L1

Brown/Blk

T1T1T2

SFB

External

Source

Pump

Blue/Wht

Brown/Wht

Compressor

Blue

Cap

BlackRed

Tan

Unit

Power Supply

208-240/50/1

Orange

Red

Black

LPR

Black/Gry

Green/Yellow

PS1

Brown

Blue

Black

240V

Com

Red

208V

NOTE 1

Yellow

24 V

Black/Wht

LPR

ELT

Note 3

1 2 3

4 5 6 7 8 9

10 11 12

24V

Green/Yellow

lack

White

Orange

Blk/Wht

Violet Black

Black White/Blue White/Blue

Red

Black

Yellow Yellow Violet

Violet

Orange

Gray

Transformer

LO C

Not Used

Microprocessor Control

ELT

Not Used

Not Used Not Used

Not Used

TEST

RVG

MODE

Interface Panel

Factory low voltage wiring Factory line voltage wiring Field low voltage wiring Field line voltage wiring Optional block Quick connect terminal

Screw terminal field connection Fuse

CY1O

CC -

Compressor contactor

Reversing Valve output

RV -

ELT - Entering Load Side Water Temperature

HP -

High pressure switch

LP -

Low pressure switch

LPR -

Load Pump Relay

RT -

Refrigerant Liquid line Temperature

SI -

Slave Input relay

Reversing Valve Coil

RC -

Load Pump Fuse Block

LFB -

Source Pump Fuse Block

SFB -

Violet

Legend

132

Field wire lug Ground Relay Contacts -

N.O., N.C.

Polarized connector

Switch - High pressure

Switch - Low pressure

Relay coil

Capacitor

hermistor

Notes:

1. Taped and wire tied off

2. 3AG 10 Amp fuse

3. For cycle load pump with a geo storage tank. Remove the orange wire from the LPR relay coil and install a jumper between the LPR relay coil and the comp contactor coil as shown in the schematic above.

97P798-14 01/19/12

Page 18

Wiring Schematics cont.

NSKW Reversible with IntelliStart - 240/50/1

NSKW INSTALLATION MANUAL

Orange

Red

Black

Black/Gry

External

Load Pump

Black/Org

NOTE

Green/Yellow

PS1

RVR

Compressor

External

Source

Pump

T1T1T2

L2 L2L1L1

NOTE 4

RVR

SFB

Blue

Black/Wht

Blue Blue

Black Black

Violet

SIR

Blue/Wht

Brown/Wht

Red 208 V

ELT

Brown

Org/Gry

Org/Grn

Yellow Yellow

LFB

Brown/Blk

LPR

RVR

Blue

NOTE 1

LPR

Yellow

4 5 6 7 8 9 10

11 12

Cap

Blue 240V

Note 5

Orange

24V

Green/Yellow

Black

Black Com

Black/

White

Orange

Blk/Wht

Violet Black

Black White/Blue White/Blue

Black

Yellow Yellow

Violet

Orange Orange

Gray

ransformer

Red

Unit

Power Supply

208-240/50/1

LO C

T L E

ELT

Org/Brn

Tan

24 V

1 2 3

NOTE 3

Red

Pink

Blue

Black

TEST

LO C

ELT T EL

Not Used

Microprocessor Control

Not Used Not Used

Org/Wht

RVG

Red

Org/Blk

Run Winding

Active

Start

Common

Interface Panel

IntelliStart

MODE

Factory low voltage wiring Factory line voltage wiring Field low voltage wiring Field line voltage wiring Optional block Quick connect terminal

Screw terminal field connection Fuse

CY1O

CC -

Compressor Contactor Reversing Valve Output

RV -

ELT - Entering Load Side Water Temperature

HP -

High Pressure Switch

LP -

Low Pressure Switch

LPR -

Load Pump Relay Contacts

RT -

Refrigerant Liquid Line Temperature

SIR -

Slave Input Relay Reversing Valve Coil

RC -

Load Pump Fuse Block

LFB -

Source Pump Fuse Block

SFB -

RVR -

Reversing Valve Relay

Legend

132

Field wire lug Ground Relay Contacts -

N.O., N.C.

Polarized connector

Switch - High pressure

Switch - Low pressure

Relay coil

Capacitor

Thermistor

Notes:

1. Taped and wire tied off

2. 3AG 10 Amp fuse

3. Move jumper wire to 5 and 6 for reversible secondary unit

4. Black Thermistor - Source Coax Blue Thermistor - Load Coax

5. For cycle load pump with a geo storage tank. Remove the orange wire from the LPR relay coil and install a jumper between the LPR relay coil and the comp contactor coil as shown in the schematic above.

97P798-16 01/19/12

Page 19

NSKW INSTALLATION MANUAL

Wiring Schematics cont.

Reversible - 380-420/50/3

Brown (42)

White (43)

Black (45)

Blk/Red (46)

Gray (47)

Blue (49)

Orange (51)

Org/Wht (52)

Black (53)

Black (26) Black (55) Black (56) Black (57) Black (58)

Black (59)

Red (60) Gray (61) Blue (62) Black (63) Black (64) Black (65)

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

39 40 41

J10

42 43

44 45 46 47

49 50 51 52 53 54 55 56

Brown (41)

LST

LFD SFP EST

LLT

ELT

NOTE 5

NOTE 6

NOTE 1

PB2

NOTE 2

Blue (66)

Wht/Blu (44)

T T

Gray/Wht (48)

Blue/Wht (50)

5VDC

AI3 +

AI5 +

AI4 +

AI6 +

AI2 +

5VDC

AI1 +

A21A12

LED 5VDC

PWM2 PWM2 Com PWM1

24VAC Com DI12 DI11 DI10 DI9 DI8 DI7

DI 3/4/5/6/ Com DI6 DI5 DI4 DI3 DI2 9VDC DI1

A14

A23

24VAC

A24

A25

A22

A13

A11

Green/Yellow (67)

24VAC Com

GROUND

A34

A35 A31

A32

A15

A33

Johnson

FX-10

Compressor

Black

Blue

Red

Black (18) Black (17)

Black (16)

Black (6)

Black (5)

Black (20)

Black (19)

Black (15)

Black (14)

Black (13)

Black (12)

Black (11) Black (10)

Black (9) Black (8) Black (7)

Black (2)

Black (1)

Blk/Wht (69)

Yellow (68)

Black (37)

Black (22)

Black (40)

Black (38)

Black (35)

Black (33)

Yellow (34)

Black (31)

Black (30)

Black (28)

Black (27)

Black (25)

Violet (24)

Orange (23)

Unit

Power Supply

380-420/50/3

20 19

D09

D08

17 16 15

D07

14 13

D06

D05 D04

9 8 7

D03

6 5

D02

D01

Black (4)

Black (3) 2 1

Internal junction Field wire lug

Factory low voltage wiring Factory line voltage wiring Field low voltage wiring Field line voltage wiring Optional block Field Zone Sensor Wiring

Ground Relay Contacts-

N.O., N.C. Thermistor

Relay coil

1 2 3

Switch - High pressure Switch - Low pressure Open Jumper

Closed Jumper

Polarized connector

Black (53) Black (55) Black (56) Black (57) Black (58)

Black (63) Black (64) Black (65)

Legend

ompressor contactor

CC -

Compressor Proving

CP -

ELT - Entering Load Water Temp

Emergency Shutdown

ES EST -Entering Source Water Temp HP - High pressure switch

Load Freeze Detection

LFD -

Load Flow Proving Switch

LFS -

Leaving Load Water Temp

LLT LP - Low pressure switch

Leaving Source Water Temp

LST -

Reversing Valve coil

RV -

Source Freeze Protection

SFP SFS -Source Flow Proving Switch

TB - Terminal Board

Black (26)

Notes:

1 - Switch Blue and Red wires for 380V operation 2 - Disconnect for -9 degree C load side freeze detection 3 - Disconnect for -9 degree C source side freeze detection 4 - Acc 1 and ACC 2 outputs are cycled with the compressor. 5 - R, C, Y1, and O inputs are for use with an aqua stat. 6 - If no flow proving switch is being used on the load side, the LF terminal on the terminal board must be jumpered to the R terminal for the unit to operate. 7 - If no flow proving switch is being used on the source side, the SF terminal on the terminal board must be jumpered to the R terminal for the unit to operate. 8 - A closed contact will enable the emergency shutdown input (ES) and the compressor proving input (CP). 9 - Primary over-ride input (POI) on a primary unit must be wired to R through anormally open contact. If the POI input is on a secondary unit connect the Primary Over-ride output (PO) from the primary unit to the POI terminal on the secondary unit. 10 - Apply 24VAC to the O terminal for cooling.

Yellow (21)

Page 20

Wiring Schematics cont.

1X2A

NSKW INSTALLATION MANUAL

Reversible - 380-420/50/3 cont.

Red 380V

NOTE 1

Transformer

Black

Blue 420V

Violet (70)

Black (54)

Green/Yellow (72)

Orange (39)

PB1

Blk/Wht

2 1

Yellow

Yellow (21)

Black (36)

Yellow (29)

Black (40)

Black (38)

Black (35)

Black (33)

Black (31)

Black (30)

Black (28)

Black (27)

Black (53)

NOTE 5

Black (55)

Black (56)

Black (57)

NOTE 6

Black (58)

Field Connection Diagram

(For units using Set Point control mode

with or without a secondary unit.)

NOTE 6

NOTE 5

24VAC

Load Valve Output

Acc 2

Acc 1

Alarm

To Primary Load Over-ride Input

(POI) of secondary unit.

To Y1 input of secondary unit.

To R from secondary unit.

To O input of secondary unit.

24VAC

Black (R)

Black (LV)

Black (X2)

Black (X1)

Black (L)

Black (PO)

Black (SE)

Black (SN)

Black (SHC)

Black (C)

Black (LF)

Black (POI)

Black (O)

Black (SF)

Black (Y1)

Black (ES)

Black (9DC)

Black (CP)

SHC

POI

9DC

Load Valve Output

cc 2

NOTE 3

Alarm

Primary Load Over-ride Output

Secondary Unit Enable

Secondary 24VAC Input

Secondary Unit Heat/Cool

24V COM

Load Flow Proving Switch

Primary Load Over-ride Input

Rev Valve

Source Flow Proving Switch

Comp 1 Emergency

Shutdown 9 VDC - Use

for CP and ES Compressor

Proving Switch

Primary Load

Over-ride Output Secondary Unit

Enable Secondary

24VAC Input Secondary Unit

SHC

Heat/Cool

Field Connection Diagram

(For units using aqua stat control

mode.)

24VAC

Load Valve Output

Acc 2

Acc 1

Alarm

Primary Load

Over-ride Output Secondary Unit

Enable Secondary

24VAC Input Secondary Unit

SHC

Heat/Cool

24V COM

Load Flow Proving Switch

Primary Load Over-ride Input

Rev Valve

Source Flow Proving Switch

Comp 1

Emergency Shutdown

9 VDC - Use for CP and ES

Compressor Proving Switch

24V COM

Load Flow Proving Switch

Primary Load Over-ride Input

Rev Valve

Source Flow Proving Switch

Comp 1 Emergency

Shutdown 9 VDC - Use

for CP and ES Compressor

Proving Switch

POI

9DC

POI

9DC

NOTE 5

NOTE 6

NOTE 8

NOTE 7

NOTE 8

NOTE 9

Aqua Stat Y1

NOTE 7

97P799-12 1/19/12

Page 21

NSKW INSTALLATION MANUAL

Heat Pump Control

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.

When the heat pump is controlled by the internal controller

it is called “Primary Mode” which allows the user to adjust the comfort level by adjusting temperature setting on the heat pump display. For more information refer to panel configuration on standard controls.

An additional way of controlling the heat pump is by use of

an external control such as an aquastat that gives a signal to the heat pump controlling to enable the compressor output. This mode of control is referred to as “Secondary Mode” and requires components from an external field supplied source. For more information on this control strategy refer to external control section of the manual.

IntelliStart

The optional IntelliStart single phase soft starter will reduce

the normal start current (LRA) by 60%. Using IntelliStart also provides a substantial reduction in light flicker, reduces startup noise, and improves the compressor’s start behavior.

Page 22

External Control

NSKW INSTALLATION MANUAL

Primary 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.

The secondary output will be energized if two conditions occur:

1. The initial temperature is greater than IC away from the set point.

2. The change in temperature in a given period of time P is less than d.

In a reversible unit, the unit is controlled by the internal controller. Compressor output is determined by the entering load-side water temperature. For reversible units, the jumper wire must be positioned across terminals 6 and 7, (factory default set to this position). Reversible units do not have a secondary output.

NOTES: SL in the configuration menu must be set to 0, (factory default). All parameters should be checked for each application on primary unit, (refer to the parameter table).

WARNING: Reversible units cannot be staged.

Secondary Mode

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 after the following condition occurs:

1. The change in temperature in a given period of time P is less than d.

In reversible units, secondary mode allows the unit to be controlled by an external source. Compressor output is determined by the Y1 input and the reversing valve is determined by the O input. In reversible units, the jumper wire must be positioned across terminals 5 and 6. Reversible units do not have a secondary input.

NOTES: SL in the configuration menu must be set to 1. P and d must be setup for each secondary unit.

Wiring an Aquastat - Reversible Unit

• To create a secondary unit, set SL to 1 in the configuration menu.

• Position the jumper wire in the control box across terminals 5 and 6.

Aquastat Wiring for Dedicated Heating or Cooling Unit

Secondary Unit

(SL=1)

Typical Aquastat

C G

Y1 = Compressor call R = 24VAC

Control Box

Aquastat Wiring for Reversible Unit

Typical Aquastat

Secondary Unit

(SL=1)

1 2 3

Jumper

Wire

4 5

6 7 8 9

10 11

C G

Y1 = Compressor call O = Reversing valve call R = 24VAC

Note: Jumper wire must be moved to terminals 5 & 6.

Control Box

Page 23

NSKW INSTALLATION MANUAL

()

External Control cont.

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.

WARNING: Do not stage more than 6 units.

The first stage must be setup as a primary unit. All other units must be setup as secondary units. The set point is stored in the primary unit. Once the set point in the primary unit has been satisfied, all units will immediately shutdown.

Staging with Aquastat

When staging units using an Aquastat, all units must be setup as secondary units.

WARNING: Do not stage more than 6 units.

Wiring for Primary/Secondary Unit Staging

X2 R

First Stage Second Stage Third Stage

NOTES: X1 = Secondary output Y1 = Compressor call

Wiring for Dedicated Heating or Cooling Units with Aquastat

Typical Aquastat

X2 R

First Stage Second Stage

NOTES: X1 = Secondary output Y1 = Compressor call R = 24 VAC

Page 24

Converting to a Dedicated Cooling Unit

NSKW INSTALLATION MANUAL

Procedure to Convert a Heating Only Unit to a

Cooling Only Unit

All non-reversible NSKW units are built at the factory as

dedicated heating units. Follow the procedures below to make the unit a dedicated cooling unit.

1. Shut off all power to the unit.

2. Remove the top and access panel.

3. Remove the brass in-well thermistor from the load water-in line.

4. Remove the brass plug from the source water-in line.

5. Place new Teflon well thermistor.

6. Thread the brass in-well thermistor into the source water-in line.

7. Make sure the thermistor wires do not touch the discharge line.

8. Place new Teflon

9. Thread the brass plug into the load water-in line.

10. Refer to the labels on the unit for the location of ports

and lines.

11. Connect the “Source Water-In” line to the port marked

“Load Water-In.” Then, connect the “Source Water-Out”

line to the port marked “Load Water-Out.”

12. Connect the “Load Water-In” line to the port marked

“Source Water-In.” Then, connect the “Load Water-Out”

line to the port marked “Source Water-Out.”

tape on the threads of the brass in-

tape on the threads of the brass plug.

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. Using the touch-pad, press the UP arrow.

21. The displays should blink “44” to show set point. Now, the unit should operate as a cooling only unit.

Jumper Pin Location

The location of the jumper pin determines the controller’s

mode of operation. Move the jumper pins to the correct location for dedicated heating, dedicated cooling or reversible settings as indicated below.

Dedicated heating - 1 & 2 * Dedicated cooling - 2 & 3 Reversible - 3 & 4 *

* Indicates factory setting.

NOTE: A reversible unit can not be configured to heating only.

Control Board with Jumper

P5 Key Pad (Interface)

P9 Not Used

Page 25

NSKW INSTALLATION MANUAL

Unit Startup

Before Powering Unit

Check the following:

• High voltage wiring is correct and matches the nameplate.

• Fuses, breakers and wire size are correct.

• Piping is completed and water system has been cleaned

and flushed.

• Air is purged from the closed loop system.

• Isolation valves are open and loop water control valves or

loop pumps are wired.

• Service/access panels are in place.

Primary Unit Startup

1. Apply power to the unit. Upon power up, the unit will display the current operation mode.

• H for dedicated heating.

• C for dedicated cooling.

• U for reversible units.

2. Press the mode button. The LED screen will display the current entering water temperature. The load pump will activate after a 5 minute delay.

3. Once the load pump has been active for 3 minutes, the controller will sample the temperature of the water system. In heating mode, when the temperature of the water shown on the display is lower than the set point the compressor will activate.

4. By using a pressure gauge and the P/T ports, check the pressure drop through both the load and source coaxes. Compare this to the capacity tables in the specification catalog to verify the proper flow rate through the unit.

5. Verify that the compressor, load side and source side pumps are operating.

6. After determining the flow rates, use a thermometer and the PT ports to determine the change in temperature on both the load and source side coaxes.

7. Compute the formula l/s flow rate X change in temperature x 4.2 (4.1 on source side if antifreeze/brine is used in the loop) = Heat of Extraction on the source side in heating, Heat of Rejection on the source side in cooling. To ensure proper operation, compare these values to the HE/HR tables.

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. Press the up arrow on the keypad to increase the set point to 5 degrees above the water temperature displayed on the LED screen.

12. Three minutes after the load pump activates, the compressor and source pump should activate.

Secondary Unit Startup

1. Apply power to the unit.

2. After a three to five-minute delay, the water temperature shall be sampled. If the controller receives a remote aquastat signal, the compressor shall activate.

3. Verify that the compressor and load side, source side pumps are running.

4. By using a pressure gauge and the PT ports, check the pressure drop through both the load and source coaxes, and compare this to the Pressure Drop tables.

5. After determining the flow rates, use a thermometer and the PT ports to determine the change in temperature on both the load and source side coaxes.

6. Compute the formula l/s flow rate X change in temperature x 4.2 (4.1 on source side if antifreeze/brine is used in the loop) = Heat of Extraction on the source side in heating, Heat of Rejection on the source side in cooling. To ensure proper operation, compare these values to the HE/HR tables.

7. Press the down arrow on the control to disrupt the remote aquastat signal. Unit should shut off.

8. Instruct the owner or operator about the correct control and system operation.

Page 26

Standard Board - Control Features

NSKW INSTALLATION MANUAL

Anti Short Cycle Time

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. The 3-5 minute startup delay is applied after all compressor shutdowns and also to system startups due to ac power interruption.

Safety Controls

The control board receives separate signals for a high pressure switch for safety, low pressure switch to prevent loss of charge damage, and a low suction temperature for freeze detection. Upon a 30-second measurement of the fault (immediate for high pressure), compressor operation is suspended and the fault will be shown on the display.

Setpoint Temperature Ranges

In Primary mode, the heating temperature setpoint range is adjustable from 15.5°C to 54.4°C with an adjustable deadband range of 1° - 15°F. The cooling setpoint temperature is adjustable from -17.7°C to 29.4°C with a fixed non-adjustable deadband of 5°F.

NOTE: Deadband adjustments are in degrees Fahrenheit (°F) only.

Load Pump Control

There are two options for controlling the load pump, Pump Sampling (PS) or Continuous Pump (C), and these are selectable in the service Menu.

Pump Sampling (PS)

In Primary Mode, the control operates on a 10 minute sample cycle in which the load pump is turned on and run to obtain a meaningful sample of the temperature the load is presenting. If the water temperature measured after the pump has been on for PS minutes (selected and adjusted from the Service Menu) is outside the user selectable deadband amount, dB (also selected and adjusted from the Service Menu), the compressor is turned on and Heating or Cooling is initiated. If the water temperature is within the deadband of the set point when sampled, the pump shuts off and is idle for (10 – PS) minutes when it starts another PS minute sample period. For example, if the PS setting is two minutes, the pump will run for 2 minutes before sampling the load temperature. If the water temperature is within the selected dead band temperature of the set point, the pump will shut off for 10 – 2 = 8 minutes before beginning another pump sampling cycle. Heating deadband is selectable in the Service Menu while the Cooling deadband is nonadjustable and fixed at 5°F.

Continuous Pump Mode (C)

If continuous pump mode (PS=C In Service Menu) is

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.

Test Mode

Connection of a jumper wire from chassis ground to P3 will place the control in the test mode. This shortens most timing delays for faster troubleshooting. In the Primary Mode the control will respond immediately if a demand is present. The anti-short cycle delay is replaced by a 10 second pump and compressor on delay. Minimum compressor run time becomes 15 seconds. Test mode will remain in effect for a maximum of 15 minutes at any one time should the jumper remain in place.

Fault Conditions

There are two classes of faults, retry faults and no retry faults. Retry faults allow the system to try 2 additional times to establish operation before displaying the fault condition and entering lockout. No-Retry 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.

Retry Faults

High pressure, low pressure and freeze detection faults are retried twice before locking the unit out and displaying the fault condition.

High Pressure (HP)

Compressor operation will be disabled immediately when the normally closed high-pressure switch is opened momentarily (set at 4.1 kPa). The LED display shall read “HP” only when the control has completed two retries, and is in lockout. The pump continues to operate throughout the retry period.

Low Pressure (LP)

Compressor operation will be disabled when the normally closed low-pressure switch (set at 275 Pa) has opened for 30 continuous seconds (if the bypass period has been satisfied). The Low Pressure switch is bypassed (ignored) for two minutes after startup. The LED display shall read “LP” only when the control has completed two retries, and is in lockout. The pump continues to operate throughout the retry period.

Freeze Detection (FP)

Compressor and loop pumps will be disabled if the control senses that the refrigerant loop temperature drops below the FP value (set in the service menu) for 30 continuous seconds (if the bypass period has been satisfied). If the compressor and the loop pump outputs are disabled because of this condition, the LED display shall read “FP.” There is a two (2) minute by-pass timer for the freeze detection at compressor start up.

Page 27

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.

High Temperature

Compressor operation will be disabled when the control senses an entering load side water temperature of

54.4°C regardless of mode.

Water Temperature Probe Open (PO)

Compressor and pump operation will be disabled when the control senses that the water probe is open or has infinite resistance. The LED display shall read “PO.”

Water Temperature Probe Closed (HC)

Compressor and pump operation will be disabled when the control senses that the water probe is closed or has no resistance. The LED display shall read “HC.”

Freeze Detection Probe Open (dO)

Compressor and pump operation will be disabled when the control senses that the freeze detection probe is open or has infinite resistance. The LED display shall read “dO.”

Freeze Detection Probe Closed (dC)

Compressor and pump operation will be disabled when the control senses that the freeze detection probe is closed or has no resistance. The LED display shall read “dC.”

Brown-Out (B0)

All operation will be disabled when the control voltage falls below 18VAC for 10-15 continuous seconds.

Resetting Lockouts

To reset any lockout condition, place the unit into the standby mode for at least 5 seconds. After the lockout has been reset, the fault display will be turned off. Cycling control power will also clear the display. Non-Retry Faults must be cleared for the display and lockout to clear.

Power Down (power outage)

The controller will store its Service Menu settings and current Mode selection in non-volatile memory so that these settings are retained through any power outage. Current operating conditions are not stored and the controller must evaluate its current conditions.

Page 28

Standard Control - Panel Conﬁ guration

NSKW INSTALLATION MANUAL

The control panel allows you to access the service menu 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:

• Standby Mode

• Heating Mode

• Cooling Mode

• Primary (Master) Mode

The control panel has both UP and DOWN (arrow) buttons and a MODE button. The UP and DOWN buttons allow you to change the set point or scroll through the configuration menu. The MODE button allow you to change mode as well as enter and exit parameters while in configuration mode.

Control Panel Configuration

The configuration menu allows you to properly set and adjust all of the unit’s operating parameters to fit your application.

To enter configuration mode and configure parameters, follow these procedures:

1. Hold down both the UP and DOWN buttons simultaneously for five seconds, or until the LED screen displays “LC”.

2. Press the UP or DOWN arrow until “50” is displayed.

3. Press the MODE button. The screen should display “SC” to indicate the controller is in configuration mode.

4. Once in configuration mode, press the UP or DOWN arrow to scroll through the menu.

5. Press the MODE button to enter the parameter. (Refer to the parameter table below for a list of configurable parameters.)

6. Once in the parameter, press the UP or DOWN arrow to change the parameter.

7. Press the MODE button to return to the main menu.

Control Panel

Changing the Setpoint

1. Pressing the UP or DOWN arrow once will display the setpoint.

2. The setpoint will flash.

3. When the setpoint is flashing, the UP and DOWN arrow will change the setpoint by one degree.

4. In Primary mode, the heating temperature setpoint range is adjustable from 15.5°C to 54.4°C with an adjustable deadband range of 1° - 15°F. The cooling setpoint temperature is adjustable from -17.7°C to 29.4°C with a fixed non-adjustable deadband of 5°F.

NOTE: Deadband adjustments are in degrees Fahrenheit (°F) only.

NOTE: The controller will exit the configuration mode after 30 seconds if no key is pressed.

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. If the change in the water temperature is less than a selected value (d) in a selected period of time (P), the secondary output shall activate.

Parameter Functions and Settings

Parameter Function Description

Calibrate the Water Sensor

Dead Band (Heating)

Celsius/ Fahrenheit Selection

Freeze Detection

Primary/ Secondary Setting

Initial Condition

Derivative This parameter is used to determine the state

Period This determines how often the derivative will be

Pump Sampling Time Selection

Freeze Detection Display

This will allow the temperature displayed to be adjusted to match a temperature reading from an external source.

This parameter is used to determine when the compressor should be activated. If the temperature is below the setpoint minus the dB value (in heating mode) then the compressor will activate. The cooling deadband is ﬁ xed at 5°F and non-adjustable.

This parameter selects the units for which the temperature will be displayed. F F or C N/A

There are three settings for this parameter; OL, CL, and P. OL is the open loop setting which corresponds to 32°F (0°C). CL is the closed loop setting which is 15°F (-10°C). P is the process setting which is 5°F (-15°C).

Primary mode utilizes an internal aquastat to determine the activity of the compressor. In secondary mode the compressor output is determined by an external aquastat.

This parameter is used to determine the state of the secondary output of the primary unit. If the actual water temperature is greater than the IC value away from the set point, the secondary output will be activated.

of the secondary output of the primary and secondary unit. If the change in temperature is less than the d value the secondary output will activate.

calculated.

This parameter determines how long the pump is activated before the controller takes a sample of the water temperature. The range of this parameter is from 1 to 5 minutes and is factory set to 3 minutes. The pump can also be set to run continuously when PS is set to C.

This displays the current temperature of the freeze detection sensor. N/A 0° to 130° N/A

Factory

Setting

0° -9° to 10° 1

1°F 1° to 15° 1

32°F P,CL,OL N/A

(Primary)

10° 0° to 20° 1°

1°F 0° to 5° 1°

5 min 1 to 5 min 1 min

3 min

Range Increments

0 or 1

1 to 5 min

or C

1 = Secondary

0 = Primary

1 min

NOTE: In Celsius mode, only the temperature display will show degrees Celsius. Deadband, Derivative, Freeze Detection display, and other functions will still use degrees Fahrenheit (°F).

Page 30

Optional Controls

NSKW INSTALLATION MANUAL

FX10 Control

The FX10 control provides unparalleled capability in several areas including performance monitoring, energy management, and service diagnosis, and then communicates it all thru standard DDC protocols like N2, Lon and BACnet (MS/TP @ 19,200 Baud Rate).

Control General Description Application Display/Interface Protocol

FX10

FX10 w/N2

The FX10 microprocessor control is self contained control featuring LP, LOC, HP, LWT, and condensate overflow fault modes can be displayed on BAS system. Optional handheld Medium User Interface (MUI) Control can be used for additional setup or servicing. Program customization is possible.

FX10 Control functions as both unitary heat pump control and DDC communication, therefore detail operational and fault information is available to BAS. Other features are same as FX10 with addition of Johnson Controls N2 compatibility.

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. This integration allows heat pump monitoring sensors, status and service diagnosis faults to be communicated thru the DDC direct to the building automation system (BAS), giving building supervisors detailed and accurate information on every piece of equipment without removing an access panel!

Cannot be integrated with centralized building automation systems. Software can be customized for specific projects.

Same as FX10 with Johnson Controls N2 BAS compatibility.

Optional Medium User Interface (MUI) can be used as a field service tool.

Standalone

Johnson Controls N2 network

FX10 w/LonWorks

FX10 w/BACnet

Same as FX10 with LonWorks BAS compatibility.

Same as FX10 with BACnet BAS compatibility.

Due to communication speed, no more than 30 units should be connected to a single trunk of the network.

Optional Medium User Interface (MUI) can be used as a field service tool.

Optional Medium User Interface (MUI) can be mounted or used as field service tool.

LonWorks

BACnet -

(19,200 Baud Rate)

MS/TP

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. The user interface can be used to aid in diagnostics and unit setup and is optional on all NSKW units. A 16-pin low voltage terminal board provides terminals for common field connections. The FX10 Control provides:

• Operational sequencing

• High and low-pressure switch monitoring

• General lockout

• Freeze Detection Temperature Sensing

• Lockout mode control

• Emergency shutdown mode

• Random start and short cycle protection

Short Cycle Protection

Allows a minimum compressor “off” time of five minutes and a minimum “on” time of two minutes.

Random Start

A delay of 1 to 120 seconds is generated after each powerup to prevent simultaneous startup of all units within a building after the release from an unoccupied cycle or power loss.

Emergency Shutdown

A field-applied dry contact can be used to place the control into emergency shutdown mode. During this mode, all outputs on the board are disabled.

Freeze Detection Temperature Limit

Field selectable for -9.4° or -1.1°C

Installation Options

• Standalone controlled by standard aqua stat

• Integrated into BAS by adding communication module

Accessory Outputs

Quantity 2. Cycled with the compressor. Field selectable for normally open (factory default) or normally closed through the building automation system or user interface.

Main FX 10 Board

Optional Plug-in Communication Modules (compatible with standard BAS protocols)

• Open N2

• LonTalk

• BACnet (MS/TP @ 19,200 Baud Rate, 30 unit max per trunk line)

Display

One local display is optional on all NSKW units. Up to 2 displays, either 1 local and 1 remote, or 2 remote. (A 2-display configuration requires identical displays.) Local display can be up to 3 meters from the controller, power supply, and data communication. Remote display can be up to 300 meters from the controller. Remote display must be independently powered with data communication done via 3 pole shielded cable.

Control Timing & Fault Recognition Delays

Lead compressor “ON” delay ..........................................90 seconds

(not applicable for single compressor models)

Minimum compressor “ON” time ...................................... 2 minutes

(except for fault condition)

Short cycle delay ..................................................................... 5 minutes

Random start delay .......................................................0-120 seconds

High pressure fault ................................................................. <1 second

Low pressure fault ...............................................................30 seconds

Freeze detection fault ................................................... 0-30 seconds

Low pressure/freeze fault bypass..................................... 2 minutes

User Interface

4 x 20 backlit LCD

Page 32

Optional Controls - FX10 cont.

NSKW INSTALLATION MANUAL

FX10 Microprocessor and BAS System

The FX10 is a microprocessor based control that not only monitors and controls the heat pump but also can communicate any of this information back to the building automation system (BAS). This means that not only does the control monitor the heat pump at the unit you can also monitor and control many of the features over the BAS. This clearly puts the FX10 in a class of its own.

The control will enumerate all fault conditions (HP, LP, LOC, and Freeze Detection) over a BAS as well as display them on a medium user interface (MUI). HP, LP, and Freeze Detection faults can all be reset over a BAS. A Loss Of Charge fault can not be reset or bypassed until the problem has been corrected. A MUI is invaluable as a service tool for the building service team.

The unit can be commanded to run by applying Y1, Y2, and O commands to the terminal board or commanded through a BAS. The control board is wired with quick connect harnesses for easy field change out of a faulty control board. An alarm history can be viewed through the MUI and will be held in memory until the unit is power cycled.

The FX10 control has unused analog and digital inputs for field installed items such as water temperature or current status switches. The control has unused binary and PWM outputs that can be commanded over the BAS for field use. A Medium User Interface (MUI) for control setup and advanced diagnostics is standard on all NSKW units.

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. The default state for the emergency shutdown data point is off. When the emergency shutdown mode is activated, all outputs will be turned off immediately and will remain off until the emergency shutdown mode is de-activated. The first time the compressor starts after the emergency shutdown mode has been de-activated, there will be a random start delay present.

Lockout Mode

Lockout mode can be activated by any of the following fault signals: refrigerant system high pressure, refrigerant system low pressure, or freeze detection. When any valid fault signal remains continuously active for the length of its recognition delay, the controller will go into fault retry mode, which will turn off the compressor. After the compressor short cycle delay, the compressor will attempt to operate once again. If three consecutive faults occur in 60 minutes, the unit will go into lockout mode, turning off the compressor, enabling the alarm output until the controller is reset. If the control faults due to the low pressure input being open during the pre-compressor startup check, the control will go into lockout mode immediately, disabling the compressor from starting and enabling the alarm output. The lockout condition can be reset by powering down the controller, by a command from the BAS, or by holding the ESC and Return keys on the user interface for 5 seconds.

Standard Features

• Anti Short Cycle

• High Pressure Protection

• Low Pressure Protection

• Freeze Detection

• Loss of Charge Detection

• Random Start

• Display for diagnostics

• Reset Lockout at disconnect or through BAS

• 2 Accessory outputs

• Optional BAS add-on controls

Page 33

NSKW INSTALLATION MANUAL

Optional Controls - FX10 cont.

Freeze Detection

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 -9.4°C by removing a jumper wire on BI-4 for the source and BI-5 for the load. The freeze detection fault condition will be bypassed for 2 minutes at normal compressor startup to allow the refrigeration circuit to stabilize. If the freeze detection sensor becomes unreliable at any time compressor operation will immediately be suspended until the problem is corrected. This will be displayed as an alarm on the BAS and the MUI. This alarm will be reported as “Water Low Temp Limit”.

High Pressure

The high-pressure switch shall be a normally closed (NC) switch that monitors the systems refrigerant pressure. If the input senses the high-pressure switch is open it must disable the compressor output immediately and count the fault. The compressor minimum on time does not apply if the high-pressure switch opens. The compressor will not restart until the compressor short cycle time delay has been satisfied.

Low Pressure

The low-pressure switch shall be a normally closed (NC) switch that monitors the systems refrigerant pressure. The input shall be checked 5 seconds before compressor start up and then ignored for the first 2 minutes after the compressor output (BO-2) is enabled. If the switch is open continuously for 30 seconds during compressor operation the compressor output (BO-2) will be disabled. The compressor will not restart until the compressor short cycle time delay has been satisfied.

Alarm Outputs

The alarm output will be enabled when the control is in the lockout mode and will be disabled when the lockout is reset.

Test Mode

By holding the ESC and down arrow keys on the MUI for 5 seconds will put the control into test mode. In test mode the random start delay and the compressor fixed on delay time will both be shortened to 5 seconds and the reversing valve will be allowed to cycle without shutting down the compressor. If an MUI is connected to the control LED 8 will flash and the words “Test Mode Enabled” will be shown on the LCD display when the control is in test mode. Test mode will be disabled after a power cycle, 30 minute timeout, or by holding the ESC and Up arrow keys on the MUI.

Sequence of Operation

Power Fail Restart

When the controller is first powered up, the outputs will be disabled for a random start delay. The delay is provided to prevent simultaneous starting of multiple heat pumps. Once the timer expires, the controller will operate normally.

Random Start Delay

This delay will be used after every power failure, as well as the first time the compressor is started after the control exits the unoccupied mode or the emergency shutdown mode. The delay should not be less than 1 second and not longer than 120 seconds. If the control is in test mode the random start delay will be shortened to 5 seconds.

Compressor Minimum On Delay

The compressor minimum on delay will ensure that the compressor output is enabled for a minimum of two (2) minutes each time the compressor output is enabled. This will apply in every instance except in the event the high pressure switch is tripped or emergency shutdown then the compressor output will be disabled immediately.

Compressor Minimum Off Delay Time

The compressor minimum time delay will ensure that the compressor output will not be enabled for a minimum of five (5) minutes after it is disabled. This allows for the system refrigerant pressures to equalize after the compressor is disabled.

Heating Cycle

The control will run the unit in heating mode when there is no command on the O/B terminal on the terminal board.

Cooling Cycle

The control will run the unit in cooling mode when there is a command on the O/B terminal on the terminal board.

MUI Alarm History Reporting

If a fault occurs the fault will be recorded in history for display on the medium user interface in the History Menu. Each fault type will be displayed in the history menu with a number between 0 and 3. A reading of 3+ will mean that fault has occurred more than three times in the past. The history menu can be cleared with a power cycle only. Alarm date and time are not included in the history.

Page 34

Optional Controls - FX10 cont.

NSKW INSTALLATION MANUAL

Inputs and Outputs Configuration

Field Selectable Options

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. When the jumper is installed on BI-5 the load freeze detection setpoint is factory set for -1.1°C. When the jumper on BI-5 is removed the load freeze detection setpoint will be -9.4°C. When the jumper is installed on BI-4 the source freeze detection setpoint is factory set for -1.1°C. When the jumper on BI-4 is removed the source freeze detection setpoint will be -9.4°C. NOTE: Piping circuit

must be antifreeze protected to the set levels or the warranty will be voided.

Accessory Output

The Accessory Outputs will be energized 90 seconds prior to the compressor output being energized. When the compressor output is turned off the accessory outputs will be deactivated immediately. The outputs are selectable for normally open or normally closed operation through the Medium User Interface or through the Building Automation System.

Control Accessories

• A99 Sensor

• MUI (LCD User interface) for diagnostics and commissioning

• MUIK3 - Panel Mount, Portable

• MUIK4 - Wall Mount

Page 35

NSKW INSTALLATION MANUAL

Reference Calculations

Heating Calculations:

LWT = EWT -

L/s x 4.2*

NOTE: * When using water. Use 4.1 for 15% methanol/water or Environol solution.

Cooling Calculations:

LWT = EWT +

L/s x 4.2*

Pressure Drop

Model L/s

0.25 6.2 4.8 4.1 3.4 2.8

NOTE: Temperatures are Entering Water Temperatures

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 14.1 13.4 12.8 12.1

0.65 25.5 24.1 23.0 21.9 20.7

0.80 34.5 32.4 30.3 29.0 27.6

0.50 11.7 9.7 9.4 9.2 9.0

0.75 24.8 23.4 22.0 20.5 19.0

1.00 38.6 37.2 34.5 31.7 29.0

1.20 57.2 55.8 52.4 49.6 46.9

0.60 22.1 20.7 19.5 18.3 17.2

0.90 37.9 36.5 35.2 33.5 32.1

1.20 54.5 52.4 50.3 48.7 46.9

1.50 79.3 77.9 75.8 74.5 72.4

0°C 15°C 25°C 35°C 50°C

Pressure Drop (kPa)

2/14/12

Operating Limits

Source Side Water Limits

Minimum Entering Water -1.1 -6.7

Normal Entering Water 29.4 15.6

Maximum Entering Water 43.3 32.2

Load Side Water Limits

Minimum Entering Water 10.0 15.6

Normal Entering Water 15.6 37.8

Maximum Entering Water 32.2 48.9

NOTES: Minimum/maximum limits are only for startup conditions, and are meant for bringing the space up to occupancy temperature. Units are not designed to operate at the minimum/maximum conditions on a regular basis.

The operating limits are dependent upon three primary

factors: 1) entering source temperature, 2) entering load temperature, and 3) flow rate L/s. When any of the factors are at the minimum or maximum levels, the other two factors must be at the normal level for proper and reliable unit operation. Consult the Performance Tables for each model to determine allowable normal operating conditions. Units are not designed for outdoor installation.

Cooling Heating

°C °C

Heating with High Source Temperatures

Heating water with a water to water unit using high source temperatures can lead to operating conditions that fall outside of the system operating range. The condition occurs when the loop (source) temperature exceeds 21.1°C with a full flow of 0.054 L/s per kW. Under this scenario, the evaporating temperature can fall outside of the compressor operating window.

To allow the system to operate correctly, restricting the source side flow when the evaporating temperature exceeds

12.7°C is recommended. One way of accomplishing this is to use a flow-restricting valve on the source loop circuit that is controlled by the evaporating temperature. Locate the sensing device on the refrigerant inlet of the evaporator.

As an alternative to the evaporating temperature, the suction line temperature can be monitored with the same control capability. In this control, temperature should be a maximum of 18.3°C.

Page 36

Flow Rates

Source Flow Rates (L/S) Load Flow Rates (L/S)

Model

Minimum Open

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 0.50 1.00 1.10

0.65 0.90 1.20 1.30 0.60 1.20 1.30

Minimum Closed

Loop

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

24.2 9,930 - 10,840

0.8 30,490 - 32,080

0.3 31,370 - 33,010

-0.3 32,270 - 33,690

-0.8 33,190 - 34,940

-16.9 79,110 - 83,750

-17.5 81,860 - 86,460

-17.8 82,960 - 87,860

NSKW INSTALLATION MANUAL

Normal Maximum Minimum Normal Maximum

2/14/12

Page 37

NSKW INSTALLATION MANUAL

Operating Parameters

Heating Mode

Entering

Load Temp (°C)

Entering

Source Temp (°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 8-10 4-9

30 993-1234 2199-2503 8-14 4-9

-15 386-490 2544-2792 4-6 3-8

0 531-586 2606-2834 6-7 4-8

10 441-869 2675-2930 7-8 4-8

20 848-359 2744-3020 8-10 2-7

30 1020-1317 2813-3116 8-12 2-7

-15 407-510 3137-3413 4-10 2-9

0 510-600 3199-3447 3-9 3-9

10 731-883 3268-3551 3-9 3-8

20 862-1076 3344-3654 3-9 2-8

30 operation not recommended

Suction

Pressure (kPa)

Discharge

Pressure (kPa)

Superheat

(°C)

Subcooling

(°C)

9/26/11

Cooling Mode

Entering

Load Temp (°C)

NOTE: Operating parameters based on normal conditions with 0.19 L/s per kW output for the load and source.

Entering

Source Temp (°C)

0 593-683 931-1103 7-12 1-8

10 634-738 1317-1475 6-11 2-8

20 676-793 1710-1848 3-8 3-9

30 696-820 2310-2530 3-8 4-9

45 724-841 2930-3206 4-9 6-11

0 614-731 903-1124 8-11 2-3

10 710-862 1338-1538 6-8 3-5

20 814-986 1772-1882 6-8 5-7

30 862-1041 2372-2627 4-7 7-8

0 634-779 883-1145 8-11 2-3

10 793-986 1358-1606 6-8 3-5

20 889-1089 1834-2027 6-8 5-7

30 1034-1158 2441-2723 4-7 7-8

0 662-834 862-1172 31-36 1-11

10 876-1110 1379-1675 23-29 2-4

20 1089-1379 1896-2172 12-21 4-11

30 operation not recommended

Suction

Pressure (kPa)

Discharge

Pressure (kPa)

Superheat

(°C)

Subcooling

(°C)

9/26/11

Page 38

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

EWT - °C

Wat er

Ethylene Glycol

Propylene Glycol

Ethanol

Methanol

WARNING: Gray area represents antifreeze concentrations greater than 35% by weight and should be avoided due to the extreme performance penalty they represent.

Antifreeze %

by wt

0 1.000 1.000 1.000 1.000 1.000

10 0.990 0.973 0.976 0.991 1.075

20 0.978 0.943 0.947 0.979 1.163

30 0.964 0.917 0.921 0.965 1.225

40 0.953 0.890 0.897 0.955 1.324

50 0.942 0.865 0.872 0.943 1.419

10 0.981 0.958 0.959 0.981 1.130

20 0.967 0.913 0.921 0.969 1.270

30 0.946 0.854 0.869 0.950 1.433

40 0.932 0.813 0.834 0.937 1.614

50 0.915 0.770 0.796 0.922 1.816

10 0.986 0.927 0.945 0.991 1.242

20 0.967 0.887 0.906 0.972 1.343

30 0.944 0.856 0.869 0.947 1.383

40 0.926 0.815 0.830 0.930 1.523

50 0.907 0.779 0.795 0.911 1.639

10 0.985 0.957 0.962 0.986 1.127

20 0.969 0.924 0.929 0.970 1.197

30 0.950 0.895 0.897 0.951 1.235

40 0.935 0.863 0.866 0.936 1.323

50 0.919 0.833 0.836 0.920 1.399

Heating Cooling

Load Source Load Source

26.7 -1.1 10.0 32.2 -1.1

Pressure

Drop

Page 39

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.

Symptom

Under Charged System (Possible Leak) Low Low Low High* Low Low Over Charged System High High High Normal High Normal Low Air Flow Heating High High High* High/Normal Low Low Low Air Flow Cooling Low Low Low Low/Normal High Low Low Water Flow Heating Low/Normal Low/Normal Low Low High High Low Water Flow Cooling High High High High* Low High High Air Flow Heating Low Low Low Low High Low High Air Flow Cooling Low High Normal High* Low Normal High Water Flow Heating Normal Low Normal High* Normal Low High Water Flow Cooling Low Low Low Low High Low Low Indoor Air Temperature Heating Low Low Low Normal High Normal/High Low Indoor Air Temperature Cooling Low Low Low Normal/Low High Low High Indoor Air Temperature Heating High High High Normal/High* Normal/Low Normal High Indoor Air Temperature Cooling High High High High* Low High Restricted TXV High Low Normal/Low High* High Low Insufficient Compressor (Possible Bad Values) Low High Low High* Normal/High Low TXV - Bulb Loss of Charge High Low Low High* High Low Scaled Coaxial Heat Exchange Heating Low Low Low Normal/Low High Low Scaled Coaxial Heat Exchanger Cooling High High High Normal/Low Low Low Restricted Filter Drier Check temperature difference (delta T) across filter drier

* Superheat will be high with high evaporator temperatures.

Head

Pressure

Suction

Pressure

Compressor

AMP Draw

Superheat Subcooling

Water (Loop)

Temperature

Differential

Page 40

Heating Cycle Analysis

NSKW INSTALLATION MANUAL

______k Pa = ______SAT° C

______° C

Suction

Load

Coax

______°C Liquid Li ne

Unit Amp Draw

Line Voltage

Loop: Open Closed

Subcooling

Superheat

NOTE: Do not attach refrigerant gauges unless a problem is suspected!

Cooling Cycle Analysis

Source

Coax

Compressor

Discharge

______kPa = ______SAT°C

______° C

Entering Source Water °C

Entering Water Pressure kPa

Leaving Source Water °C

Leaving Water Pressure kPa

Entering Load Water °C

Entering Load Water Pressure kPa

Leaving Load Water °C

Leaving Load Water Pressure kPa

______k Pa = ______SAT °C

______° C

Load Coax

______°C Liquid Li ne

Source

Coax

Unit Amp Draw

Line Voltage

Loop: Open Closed

Subcooling

Superheat

NOTE: Do not attach refrigerant gauges unless a problem is suspected!

Suction

Compressor

Discharge

______k Pa = ______ SAT°C

______° C

Entering Source Water °C

Entering Water Pressure kPa

Leaving Source Water °C

Leaving Water Pressure kPa

Entering Load Water °C

Entering Load Water Pressure kPa

Leaving Load Water °C

Leaving Load Water Pressure kPa

Page 41

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: _____________________________ Installation Date: _________________________________

Check One

Start up/Check-out for new installation

1. FLOW RATE IN L/s (SOURCE SIDE HEAT EXCHANGER) Water In Pressure: a.______ kPa

Water Out Pressure: b.______ kPa Pressure Drop = a - b c.______ kPa Convert Pressure Drop to Flow Rate

(refer to Pressure Drop table) d.______ L/s

2. TEMPERATURE RISE OR DROP ACROSS SOURCE SIDE HEAT EXCHANGER

Water In Temperature: e.______ °C e.______ °C Water Out Temperature: f. ______ °C f. ______ °C Temperature Difference: g.______ °C g.______ °C

3. TEMPERATURE RISE OR DROP ACROSS LOAD SIDE HEAT EXCHANGER

Water In Temperature: h.______ °C h.______ °C Water Out Temperature: i. ______ °C i. ______ °C Temperature Difference: j. ______ °C j. ______ °C

4. HEAT OF REJECTION (HR) / HEAT OF EXTRACTION (HE) CALCULATION HR or HE = Flow Rate x Temperature Difference x Brine Factor*

d. (above) x g. (above) x 4.1 for Methanol or Environol, 4.2 for water* Heat of Extraction (Heating Mode) = kW/hr Heat of Rejection (Cooling Mode) = kW/hr Compare results to Capacity Data Tables

Note: Steps 5 through 8 need only be completed if a problem is suspected

T Troubleshooting Problem:___________________________________T

COOLING HEATING

5. WATTS Volts: m._____

Total Amps (Comp. + Fan): n. _____ AMPS n. ______ AMPS n. Watts = m. x n. x 0.85 o. _____ WATTS o. ______ WATTS o.

6. CAPACITY Cooling Capacity = HR. - o. Heating Capacity= HE. + o.

7. EFFICIENCY Cooling EER = p. / o. Heating COP = p. / o.

8. SUPERHEAT COOLING HEATING HYDRONIC Suction Pressure: r. ______ kPa r. ______ kPa r. ______ kPa Suction Saturation Temperature: s. ______ °C s. ______ °C s. ______ °C Suction Line Temperature: t. ______ °C t. ______ °C t. ______ °C Superheat = t. - s. u. _____ °C u. ______ °C u. ______ °C

Head Pressure: v. ______ kPa v. ______ kPa v. ______ kPa High Pressure Saturation Temp.: w. _____ °C w. _____ °C w. _____ °C Liquid Line Temperature*: x. ______ °C x. ______ °C x. ______ °C Subcooling = w. - x. y. ______ °C y. ______ °C y. ______ °C

* Note: Liquid line is between the source heat exchanger and the expansion valve in the cooling mode; between the load heat exchanger and the expansion valve in the heating mode.

S.H.) / SUBCOOLING (S.C.

COOLING

VOLTS m.______ VOLTS m.

. _____ kW/hr . _____ kW/hr

. _____ COP . _____ COP

COOLING

HEATING HYDRONIC

VOLTS AMPS WATTS

Page 42

Troubleshooting

NSKW INSTALLATION MANUAL

Should a major problem develop, refer to the following information for possible causes and corrective steps:

Compressor Won’t Run

1. The fuse may be blown or the circuit breaker is open. Check electrical circuits and motor windings for shorts or grounds. Investigate for possible overloading. Replace fuse or reset circuit breakers after the fault is corrected.

2. Supply voltage may be too low. Check voltage with a volt meter.

3. Remote control system may be faulty. Check aquastat for correct wiring, setting and calibration. Check 24-volt transformer for burnout.

4. Wires may be loose or broken. Replace or tighten.

5. The low pressure switch may have tripped due to one or more of the following: a. Fouled or plugged coaxial heat exchangers

b. Low or no water flow (source side heating, load side cooling) c. Water too cold (source side heating) d. Low refrigerant

6. The high pressure switch may have tripped due to one or more of the following: a. Fouled or plugged coaxial heat exchanger

b. Low or no water flow (source side cooling, load side heating) c. Water too warm (source side cooling)

7. Check the capacitor (Single Phase only).

8. The compressor overload protection may be open. If the compressor dome is extremely hot, the overload will not reset until cooled down. If the overload does not reset when cool, it may be defective. If so, replace the compressor.

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.

Insufficient Cooling or Heating

1. Check aquastat for improper location (secondary mode only).

2. Check for restriction in water flow.

3. Check subcooling for low refrigerant charge.

4. The reversing valve may be defective and creating a bypass of refrigerant. If the unit will not cool, check the reversing valve coil.

5. Check thermal expansion valve for possible restriction of refrigerant flow.

Noisy Unit Operation

1. Check compressor for loosened mounting bolts. Make sure compressor is floating free on its isolator mounts.

2. Check for tubing contact with the compressor or other surfaces. Readjust it by bending slightly.

3. Check screws on all panels.

4. Check for chattering or humming in the contactor or relays due to low voltage or a defective holding coil. Replace the component.

5. Check for proper installation of vibration absorbing material under the unit. Unit must be fully supported, not just on corners.

6. Check for abnormally high discharge pressures.

Page 43

NSKW INSTALLATION MANUAL

Troubleshooting cont.

Troubleshooting Controls

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.

Check the mode:

1. If the unit is running on the internal aquastat, verify the unit is in “Primary” mode. The SL should be set to 0 in the setup menu.

2. If the unit is running on an external aquastat, the SL should be set to 1.

Check the jumpers on the control board:

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.

2. If the unit is a cooling only unit, the jumper should be across 2 and 3.

3. If the unit is a reversible unit, the jumper should be across 3 and 4.

Check the thermistor calibration:

1. Using a thermometer in the P/T port, check the incoming water temperature.

2. Verify that the measured temperature is within 3 degrees of the temperature displayed on the unit.

3. If it is not, adjust the calibration in the setup menu.

Standard Control Diagnostic Table

DISPLAY FAILURE DIAGNOSTIC

Freeze detection thermistor is closed (shorted) Replace the freeze detection thermistor (clip-on

thermistor)

Freeze detection thermistor is open Verify that the freeze detection thermistor is

secured properly in the board connector. If the connection is secure, replace the thermistor.

Freeze detection The water going through the unit has reached the

freeze point setting (P=5, CL=15, OL=30). Verify that the freeze detection setting is correct for the application.

Water set point thermistor is closed (shorted) Replace the water set point thermistor (threaded

thermistor).

High Pressure The unit has cut out on high pressure. Discharge

pressure is >4.1 kPa.

Low Pressure The unit has cut out on low pressure. Suction

pressure is <275 Pa.

Water set point thermistor is open Verify that the water set point thermistor is

properly secured in the board connector. If the connection is secure, replace the thermistor.

Page 44

Preventive Maintenance

NSKW INSTALLATION MANUAL

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.

NOTES: If the installation is performed in an area with a known high mineral content in the water, it is best to establish a periodic maintenance schedule to check the water-to-refrigerant heat exchanger on a regular basis. Should periodic cleaning be necessary, use standard cleaning procedures which are compatible with either the cupronickel or copper water lines. Generally, the more water flowing through the unit, the less chance there is for scaling. Low flow rates produce higher temperatures through the coil. To avoid excessive pressure drop and the possibility of copper erosion, do not exceed flow rate as shown on the specification sheets for each unit.

Cleaning Procedure

1. Close the inlet and outlet water valves to isolate the heat

pump from the well system, water heater or loop pumps.

2. Disconnect piping and remove solenoid valve, pumps,

etc, from the inlet and outlet connections on the heat pump.

3. Connect plastic hoses from the circulating pump to the outlet of the water-to-refrigerant heat exchanger to be de-limed (refer to the Cleaning Connections illustration).

4. Connect a plastic hose from the circulating pump inlet to the bottom of a plastic five (5) gallon pail (refer to the Cleaning Connections illustration).

5. Connect a plastic hose from the inlet line of the waterto-refrigerant heat exchanger to the plastic pail. Secure tightly to ensure that circulating solution does not spill

(refer to the Cleaning Connections illustration).

6. Partially fill the plastic pail with clear water (about twothirds full) and prime the circulating pump. Circulate until lines are full.

7. Start the circulating pump and slowly add a commercial scale remover* to the water as recommended by the scale remover manufacturer’s directions.

8. Be sure the pump circulation is opposite to the normal water flow through the water-to-refrigerant heat exchanger.

9. Maintain re-circulation until all scale and other material

has been dissolved and flushed from the heat exchanger.

10. Upon completion of the procedure. Safely dispose of the solution.

11. Rinse the pump and plastic pail. Refill with clear water.

12. Start the pump circulation and flush the system until all acid residue has been removed from the system. Refill

the plastic pail until only clear water is circulated.

13. Turn off the circulating pump and disconnect all hoses and fittings.

14. Replace solenoid valves, pumps, hoses and other devices in their original locations. On closed loop systems, be sure to purge between the flow center and

unit to avoid getting air into the loop.

15. Put the heat pump back into operation. Check for

proper operating temperature.

Cleaning Connections

Five-gallon Bucket

Pump

NOTE: *Virginia Chemical Co. makes a liquid ice machine cleaner which should be used on water-to-refrigerant heat exchangers serving a domestic hot water system. Calci-Solve by NYCO is available for use on other heat exchangers

WARNING: This process involves a caustic solution and may be harmful to people and animals. Wear protective equipment (glasses, rubber gloves, apron, etc.)

Page 45

NSKW INSTALLATION MANUAL

Service Parts

Part Description 06 08 12 17

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 36P500B02 Reversing Valve with Coil 33P506-04 33P503-05 33P526-04 33P526-04

Hot Water Generator Coil n/a 62I516-03 62I516-03 62I516-03 Source Coaxial Heat Exchanger (copper) 62I573-01 62I574-01 62I543-04 62I557-01 Source Coaxial Heat Exchanger (cupronickel) 62I573-02 62I574-02 62I543-03 62I557-02

Load Coaxial Heat Exchanger (copper) 62I573-01 62I574-01 62I543-04 62I557-01

Refrigeration Components

Load Coaxial Heat Exchanger (cupronickel) 62I573-02 62I574-02 62I543-03 62I557-02

DHW Load Coax Vented Double Wall (copper) 62P549-01 n/a n/a n/a

High Pressure Switch 35P506B02 35P506B02 35P506B02 35P506B02

Low Pressure Switch 35P506B01 35P506B01 35P506B01 35P506B01

Water Temperature Sensor for Standard Control

Board

Freeze Detection Sensor for Standard Control

Board

Safeties / Sensors

Compressor Contactor - Single Phase 13P004A03 13P004A03 13P004A03 13P004A03 Compressor Contactor - Three Phase 13P537B03 13P537B03 13P537B03 13P537B03 Transformer - 220-240v 15P501-02 15P501-02 15P501-02 15P501-02 Transformer - 380-420v 15P511-02 15P511-02 15P511-02 15P511-02 Connection Block - 3 Position 12P503-06 12P503-06 12P503-06 12P503-06 Connection Block - 12 Position 12P503-07 12P503-07 12P503-07 12P503-07 Connection Block - 12 Position Double Tab 12P528B01 12P528B01 12P528B01 12P528B01 Control Touch Screen 19S561-02 19S561-02 19S561-02 19S561-02 Standard Control Board 17P549-04 17P549-04 17P549-04 17P549-04

FX10 Control Board w/ Harness 17S51606-00 17S51606-00 17S51606-00 17S51606-00

Electrical

FX10 Communication Card - Open N2 17P516-08 17P516-08 17P516-08 17P516-08

FX10 Communication Card - Lonworks 17P516-09 17P516-09 17P516-09 17P516-09

FX10 Communication Card - Backnet 17P516-10 17P516-10 17P516-10 17P516-10

MUI - Medium User Interface 19P580-01 19P580-01 19P580-01 19P580-01

MUI Card 17P516-11 17P516-11 17P516-11 17P516-11

IntelliStart Soft Starter

IntelliStart Power Block 12P546-01 12P546-01 12P546-01 12P546-01 Grounding Lug 12P004A 12P004A 12P004A 12P004A

Rear Access Panel 40F749-01 40F749-01 40F749-01 40F749-01

Front Access Panel without MUI 40F749-01 40F749-01 40F749-01 40F749-01

Front Access Panel with MUI 40F749-02 40F749-02 40F749-02 40F749-02

Cabinet

Front Plastic Access Panel 40P542-50 40P542-50 40P542-50 40P542-50 Top Panel 42P557-01W 42C544-01 42C544-01 42C544-01

12P541-01 12P541-01 12P541-01 12P541-01

12P505-05 12P505-05 12P505-05 12P505-05

1/15/15

Page 46

Revision Table

Pages: Description: Date: By:

All Updated Nomenclature, Electric Heating Data, Service Parts List and Physical Data 05 May 2015 MA

All Revision table added 05 May 2015 MA

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 of continual product research and development and reserves the right to change design and speciﬁ cations without notice.

IM1066WN 05/15