NDW Installation Manual

NDW 8 to 5 on Hydronic Unit NDW Installation Manual Installation Information Water Piping Connections Electrical Data Microprocessor Control Startup Procedures Preventive Maintenance NDWIM 08/09

able of Contents Model Nomenclature.... General Installation Information... Water Quality... 4 Field Connected Water Piping... 5- NDW ypical Application Piping.... 7 Electrical Data... 8 Wiring Schematic... 9- Field Wiring and Control Setup.... - Control Features...4-5 Sequence of Operation.... Inputs and Outputs Configuration... 7 Networking Protocol.... 7 Unit Display and Interface... 8-0 Physical Data... AHRI Data... Reference Calculations... Legend and Notes... Performance Data... 4- Operating Parameters.... Load and Source Pressure Drop... Unit Startup... roubleshooting....4 Preventive Maintenance... 5 Service Parts List...

NDW 8 to 5 on Hydronic Unit Model Nomenclature - 4-7 8 9 0-4 NDW 0 R 8 N B SS A Family NDW = Envision Series Hydronic Heat Pump Capacity 00 MBUH 0 MBUH 50 MBUH 80 MBUH Operation R = Reversible Voltage = 08-0/0/ (Residential) 0 = 08-0/0/ (Commercial) = 08-0/0/ 4 = 40/0/ 5 = 575/0/ Vintage A = Current Non-Standard Options SS = Non-Standard Water Connections B = Back mounted connections = op mounted connections IntelliStart Option N = None A = IntelliStart* Controls 8 = FX0 without communication, with User Interface 9 = FX0 w/ Open N Com Card, w/ User Interface 0 = FX0 w/ Lonworks Com Card, with User Interface = FX0 w/ BacNet Com Card, w/ User Interface NOE: *IntelliStart available only on 08-0/0/ units. /9/09

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. NOE: Before installing, check voltage of unit(s) to ensure proper voltage. Application 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. Units are not intended for heating domestic (potable) water by direct coupling. If used for this type of application, a secondary heat exchanger must be used. 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. WARNING: o 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. hese 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. WARNING: o avoid equipment damage and possible voiding of warranty, be sure that properly sized strainers are installed upstream of both brazed plate heat exchangers to protect them against particles in the fluid. 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. Vibration Pad Mounting

Water Quality General NDW systems may be successfully applied in a wide range of residential, commercial, and industrial 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. Water reatment Do not use untreated or improperly treated water. Equipment damage may occur. he use of improperly treated or untreated water in this equipment may result in scaling, erosion, corrosion, algae or slime. he services of a qualified water treatment specialist should be engaged to determine what treatment, if any, is required. he product warranty specifically excludes liability for corrosion, erosion or deterioration of equipment. he heat exchangers in the units are stainless steel plates with copper brazing. he water piping in the heat exchanger is steel. here may be other materials 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. Contaminated Water 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. he 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. Strainers hese units must have properly sized strainers upstream of both brazed plate heat exchangers to protect them against particles in the fluid. Failure to install proper stainers and perform regular service can result in serious damage to the unit, and cause degraded performance, reduced operating life and failed compressors. Improper installation of the unit (which includes not having proper strainers to protect the heat exchangers) can also result in voiding the warranty. Field supplied strainers with 0-40 mesh (50-00 microns) are recommended, with 0 mesh (800 microns) being the optimum choice. he strainers selected should have a mesh open area of at least square inches (9 square centimeters) for each unit being serviced by the strainer. Using strainers with a smaller amount of open area will result in the need for more frequent cleaning. Strainers should be selected on the basis of acceptable pressure drop, and not on pipe diameter. he strainers selected should have a pressure drop at the nominal flow rate of the units low enough to be within the pumping capacity of the pump being used. WARNING: Must have intermediate heat exchanger when used in pool applications. Water Quality Guidelines Material Copper 90/0 Cupro-Nickel Stainless Steel ph Acidity/Alkalinity 7-9 7-9 7-9 Scaling Calcium and Magnesium Carbonate (otal Hardness) less than 50 ppm (otal Hardness) less than 50 ppm (otal Hardness) less than 50 ppm Corrosion Iron Fouling (Biological Growth) Erosion Hydrogen Sulfide Less than.5 ppm (rotten egg smell appears at 0.5 PPM) 0-50 ppm Less than ppm Sulfates Less than 5 ppm Less than 5 ppm Less than 00 ppm Chlorine Less than.5 ppm Less than.5 ppm Less than.5 ppm Chlorides Less than 0 ppm Less than5 ppm Less than 00 ppm Carbon Dioxide Less than 50 ppm 0-50 ppm 0-50 ppm Ammonia Less than ppm Less than ppm Less than 0 ppm Ammonia Chloride Less than.5 ppm Less than.5 ppm Less than.5 ppm Ammonia Nitrate Less than.5 ppm Less than.5 ppm Less than.5 ppm Ammonia Hydroxide Less than.5 ppm Less than.5 ppm Less than.5 ppm Ammonia Sulfate Less than.5 ppm Less than.5 ppm Less than.5 ppm otal Dissolved Solids (DS) Less than 000 ppm 000-500 ppm 000-500 ppm LSI Index +0.5 to -.05 +0.5 to -.05 Iron, Fe + (Ferrous) Bacterial Iron Potential Iron Oxide Suspended Solids <. ppm <. ppm <. ppm Less than ppm. Above this level deposition will occur. Less than 0 ppm and filtered for max of 00 micron size Less than ppm. Above this level deposition will occur. Less than 0 ppm and filtered for max of 00 micron size +0.5 to -.05 Less than ppm. Above this level deposition will occur. Less than 0 ppm and filtered for max of 00 micron size hreshold Velocity (Fresh Water) < ft/sec < ft/sec < ft/sec Grains = PPM divided by 7 mg/l is equivalent to PPM /8/08 4

Field Connected Water Piping General Each unit is equipped with captive in. [50.8 mm] FP water connections to eliminate egg-shaping from use of a backup wrench. For making the water connections to the unit, a eflon tape thread sealant is recommended to minimize internal fouling of the piping. Do not over tighten connections. NOE: Units are factory run-tested using propylene glycol. Prior to connecting piping to unit, thoroughly flush heat exchangers. he piping installation should provide service personnel with the ability to measure water temperatures and pressures. he water lines should be routed so as not to interfere with access to the unit. he 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. he return valve can be adjusted to obtain the proper water flow. he valves allow the unit to be removed for servicing. 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 0 ft. per connection. Check carefully for water leaks. Load and Source Piping Connections he NDW Series has two connection options available. Each kit is intended to connect one piping connection. herefore, two kits will be required for each unit. he kits can be mixed for installer convenience, one on source and the other on load. CKNDW - Strainer Connection Kit includes a copper tee with integral P/ plug and a Y strainer. Other components to complete the all copper piping can be sourced locally. HHKS - Strainer Hose Kit set includes Hose kit includes a stainless steel braided hose with integral P/ plug and Y strainer. Water Flow Rate he proper water flow must be delivered to each unit whenever the unit heats or cools. o assure proper flow, the use of pressure/temperature ports is recommended to determine the flow rate. hese ports should be located adjacent to the supply and return connections on the unit. he proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerantto-water heat exchanger (See Pressure Drop able for water flow and pressure drop information). Load Flow Rate he load flow on all water to water products including the NDW Series should be gpm per ton (typically the rated flow and the highest flow shown in the capacity charts). Refer to the table below. his flow rate is required especially when heating water to limit the effects of the higher condensing temperatures of water heating for radiant floor heating or domestic water use. Source Flow Rate he source flow can range between.5 and gpm per ton for earth loops. For open loop well water systems the minimum flow should be.5 gpm per ton. In earth loop systems where entering water temperatures are expected to be above 95, gpm per ton should be used. In well systems where the water temperature is below 50, gpm per ton should be used to avoid nuisance freeze detection trips. Minimum Open Loop Source Flow Rate Open Loop < 50 Closed Loop Range (Min - Full Flow) Load Flow Rate NDW00 5 0 0 0 NDW0 8 4 7 NDW50 8 4 4 NDW80 4 48 48 Flushing Flushing the system of debris is especially important in brazed plate heat exchanger systems. hese systems have many small parallel flow paths in which debris can clog. Initial flushing of the system can be accomplished in one of two ways. First flushing the piping system as shown (pages -7) toward the strainer will allow the strainers to capture all debris prior the heat exchangers and commissioning. Secondly a temporary bypass can be included in the piping design so that the heat pump itself can be bypassed during the initial flushing stage with an external strainer gathering the debris. CAUION: Water piping exposed to outside temperature may be subject to freezing. HHKS CKNDW 5

Field Connected Water Piping cont. Closed Loop ower/boiler Systems he water loop is usually maintained between 0 [5.5 C] and 90 [. C] for proper heating and cooling operation. his is accomplished with a cooling tower and a boiler. Ball Valves o reject excess heat from the condenser water loop, the use of a closed-circuit evaporative cooler or an open type cooling tower with a secondary heat exchanger between the tower and the condenser water loop is recommended. If an open type cooling tower is used without a secondary heat exchanger, continuous chemical treatment and filtering of the water must be performed to ensure the water is free from damaging materials. CAUION: Water piping exposed to outside temperature may be subject to freezing. NDW Y-strainer P Ports Open Loop Well Water Systems Installation of an open loop system is not recommended unless water quality guidelines are met. Earth Coupled Systems All supply and return water piping should be insulated to prevent excess condensation from forming on the water lines. Ensure pumping system is capable of providing adequate flow rate at the system pressure drop,.0 GPM per ton [0.054 LPS per ] (source side) is recommended. Antifreeze in the loop is strongly recommended. Heating with High Source emperatures 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. he condition occurs when the loop (source) temperature exceeds 70 [. C] with a full flow of GPM per ton [0.054 LPS per ]. Under this scenario, the evaporating temperature can fall outside of the compressor operating window. Closed Loop (Boiler/ower) Systems NDW P Ports Open Loop Well Water Systems Well ank Solenoid Valve Ball Valve Boiler Drain Y-strainer o allow the system to operate correctly, restricting the source side flow when the evaporating temperature exceeds 55 [.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. In dual circuit systems, the company recommends monitoring both circuits and controlling off the sensor that reads the highest temperature. 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 5 [8. C]. NDW P Ports Flow Center Y-strainer A kit is available for this application, contact WaterFurnace for support. Earth Coupled Systems

NDW ypical Application Piping 0 PSI RELIEF VALVE Pressure Reduction Pressure Gauge Air Vent LOAD PUMP Back Flow Preventer / Pressure Relief Valve Pressure Reduction Expansion ank Air Separator HYDRONIC LOAD Dielectric Unions GEO SORAGE ANK WaterFurnace NDW Series Dielectric Unions -/ FP Hose Kit Source OU P/ Ports P/ Ports -Way Valves Ball Valve Hose Kit Source IN NOE: * A 0 PSI pressure relief valve (Part No: SRV0) should be used in hydronic applications. Y-Strainer (required to prevent damage from fouling) Flow Switch (optional) Y-Strainer (required to prevent damage from fouling) 7

Electrical Data Model Supply Circuit Rated Voltage Voltage Min/Max Compressor* MCC RLA LRA LRA** L/L 08-0/0/ 87/5 4..4 4.0 47.0 - -.4.0 50 L/L4 08-0/0/ 87/5 4..4 4.0 47.0 4. 4. 4.8 4.4 0 00 Single 08-0/0/ 87/5 4.9.0 0.0 - - -.0.0 50 Single 40/0/ 44/50. 7.8 5.0 - - - 5. 7. 5 Single 575/0/ 57/ 8.9 5.7 8.9 - - -.4.8 5 L/L 08-0/0/ 87/5 47.0 0. 45.0 5.0 - - 0. 7. 0 L/L4 08-0/0/ 87/5 47.0 0. 45.0 5.0 4. 4. 8.5 4.0 70 0 Single 08-0/0/ 87/5 8.0 7. 0.0 - - - 4. 8.9 50 Single 40/0/ 44/50 5.0 9. 70.0 - - - 9.. 0 Single 575/0/ 57/.5 8.0 5.0 - - -.0 8.0 5 L/L 08-0/0/ 87/5 4.0.9 45.0 5.0 - -.9. 0 L/L4 08-0/0/ 87/5 4.0.9 45.0 5.0 4. 4. 5. 4.0 0 50 Single 08-0/0/ 87/5 5.0.4 90.0 - - - 44.8 50.4 70 Single 40/0/ 44/50 9.0. 87.0 - - - 4.4 7.5 0 Single 575/0/ 57/ 5.0 9..0 - - - 9.. 0 L/L 08-0/0/ 87/5 50.0. 85.0 5.0 - -. 40. 70 L/L4 08-0/0/ 87/5 50.0. 85.0 5.0 4. 4. 40.5 48.5 80 80 Single 08-0/0/ 87/5 9.0.0 90.0 - - - 5.0 58.5 80 Single 40/0/ 44/50 9.0.0 00.0 - - -.0 9. 40 Single 575/0/ 57/ 4.5 9. 7.0 - - - 8. 0.9 0 HACR circuit breaker in USA only 7//09 * Ratings per each compressor - unit supplied with two ** With optional IntelliStart (single phase only) Load Pump FLA Source Pump FLA otal Unit FLA Min Circ Amp Max Fuse/ HACR Figure - Control Box Pump Contactor (CC-P) Optional IntelliStart M (Single Phase Only) Compressor Contactor (CC-A) FX0 Control Board Compressor Contactor (CC-B) Supply (Field line voltage connection) Compressor Current Sensors FX0 Expansion Board ransformer Run Capacitor (Single Phase Only) Field Low Voltage Connections 08 or 0 Volt Switch (If applicable) 8

- + - + - + - + Wiring Schematics 08-0/0/ Legend CC Compressor Contactor LP Low Pressure CS Current Switch LS Leaving Source emp EL Entering Load emp L-WC Load Water Coil emp ES Emergency Shutdown PB Block ES Entering Source emp RV Reversing Valve HP High Pressure SFS Source Flow Switch LFS Load Flow Switch S-WC Source Water Coil emp Leaving Load emp B erminal Board Factory low voltage wiring Factory line voltage wiring Open Jumper Field low voltage wiring Field line voltage wiring Closed Jumper Optional block Field Supplied Option ¼ Quick Connector hermistor Ground Relay coil B C 4VAC COM (C) RS DO-9 (0) 5 (RS) SS DO-8 (9) 4 (SS) R 4VAC (R) Yellow (5) X DO-7 (8) (X) Comp B LC (LC ) Alarm Brown (5) LC Comp A Alarm (LC ) Brown (5) X Acc NOE 4 (X) Blue (5) Y COMP Blue (45) 0 (Y) Y COMP (Y) Blue (4) (O/B) O/B REV VALVE NOE 8 Orange (47) G NO USED (G) AIC NO USED ransformer 4V D09 D08 D07 Compressor ( Circuit B ) Current Switch D0 D05 D04 D0 D0 D0 CSB 0 9 8 7 5 4 J8 5VDC 0 9 8 7 5 4 GROUND 4VAC Com 4VAC AI 4 White/Red (80) White/Red (80) 5 White/Red (8) White/Red (8) - AI5 + 7 NOE 7 - AI4 + AI A4 A4 A4 A A5 A5 A AI 5VDC AI LED 5VDC 4 5 A A A A 7 8 A A A J 9 PWM an /White (8) 40 PWM Com 4 PWM an /White (8) A5 Johnson FX-0 Compressor ( Circuit A ) Blue Red an (5A) Unit Supply # 08-0/0/ CCA G L L J0 4 4VAC Com White () 4 DI White (7) 44 DI SFS Connect to R on PB- Gray (48) 45 DI0 NOE Orange (47) 4 DI9 Blue (4) 47 DI8 Blue (45) 48 DI7 L EX (7A) (4A) HP-A (74A) 5 (5A) /Orange (7B) /Orange (4B) HP-B /Orange (74B) /Orange (5B) Blue/Wht (7B) J9 (54) 49 DI /4/5// Com Blue (7A) 50 DI NOE Red (55) 5 DI5 NOE Gray (5) 5 DI4 Blue (7B) 5 DI ES Brown (57) 54 DI NOE 9 Pink (58) 55 9VDC LFS Gray (59) 5 DI Blue (7B) LP-B Blue/Wht (49B) 8 Blue (7A) Blue (7A) LP-A Blue (49A) 7 (49) Orange Orange/Wht (B) 4 (A) Orange (B) RV Orange/Wht (0B) NOE 8 Orange (A) RV Orange (0A) Orange (0) EL an /White (8) J7 an /White (8) an /White (8) 0 an /White (8) LS Main Board Connection A A A A4 J 4 Vac 4 Vac Com DO 4 Vac DO5 DO4 4 Vac DO AI EXP 5Vdc 5 Vdc Com AI EXP 5Vdc J 5Vdc Com 5Vdc AI EXP 5Vdc Com 5Vdc AI4 EXP 5Vdc Com J 7 5 4 0 0 4 5 7 8 9 0 A A A4 A A A A A4 Johnson FX0 Expansion Board S-WC Circuit A L-WC Circuit A S-WC Circuit B L-WC Circuit B (F0) (F9) (F8) (F7) (F) (F5) (F4) (F) (F) (F) (F0) (F9) (F8) (F7) (F) (F5) (F4) (F) (F) White/Blue () White/Blue (4) (F) White/Blue () White/Blue (4) 8 Yellow/Red (5) 9 Yellow/Red () Yellow/Red (5) 0 Yellow/Blue (7) Yellow/Red () Yellow/Blue (8) Yellow/Blue (7) an / (84) Yellow/Blue (8) 0 an / (85) 9 an / (84) 0 8 an / (85) 7 5 4 0 Yellow (4) Yellow Yellow Yellow PB Red NOE 08V Blue 0V (95) /White Yellow (AIC) SC NO USED (SC) L NO USED (L) O NO USED (O) Notes - Swap Red and Blue ransformer wires for 08V operation. - Disconnect for 5 degree F source side freeze detection - Disconnect for 5 degree F load side freeze detection 4 - Acc output is cycled with the lead compressor. 5 - If no flow proving switch is being used on the load side, the input must be jumpered to PB- for the unit to operate. - If no flow switch is being used on the source side, the input must be jumpered to R on PB- for the unit to operate. 7 - Jumpers must be set as shown for correct control operation. If a communication card is present, it must be removed to check the jumpers. 8 - Reversing Valve will be energized for cooling mode. 9 - Used for Emergency Shutdown in conjunction with a normally open relay 0 - External load and source pumps must be externally fused. 7/8/09 Blue Yellow () /White () (0) (9) /White () Green/Yellow () Yellow (5) (8) Brown (5) Brown (5) PB CS-A CS-B Brn/Blk (4) Circuit A Circuit B Brn/Blk (4) Brn/Wht (87) ES Brn/Wht (8) L (70A) Red Orange (A) Blue (5) (75A) /Org (75B) Violet (7) Violet () CC-B CC-A /White (7) /White (7) BLACK WIRE HARNESS Blue (45) Blue (4) Orange (47) White (7) White () Orange (0) (70A) (75A) /Org (70B) /Org (75B) (75A) /Org (70B) /Org (75B) Current Switch CSA AWB AWB Load Pump an (5B) L Orange (A) Blue (50) Orange (0) White () /Org (70B) (70A) White (7) Unit Supply # 08-0/0/ CCB External NOE 5 NOE 0 Source Pump CCP G L L EX L L Green/Yellow () Blue (50) CC-P /White () /White () L White (8) Blue (7) 0V 7 9 8 5 4 S 7 R C 8 4 9 5 S R C G G A 9 8 7 5 4 B 5 4 9 7 8 4 5 7 8 D0 D0 D07 D08 (A) (A) White (B) White (B) 9

- + - + - + - + Wiring Schematics cont. 08-0/0/ with IntelliStart Option Legend LP Low Pressure LS Leaving Source emp L-WC Load Water Coil emp PB Block RV Reversing Valve SFS Source Flow Switch S-WC Source Water Coil emp B erminal Board CC Compressor Contactor CS Current Switch EL Entering Load emp ES Emergency Shutdown ES Entering Source emp HP High Pressure LFS Load Flow Switch Leaving Load emp Open Jumper Closed Jumper ¼ Quick Connector Ground Factory low voltage wiring Factory line voltage wiring Field low voltage wiring Field line voltage wiring Optional block Field Supplied Option hermistor Relay coil B C 4VAC COM (C) RS DO-9 (RS) 5 (0) SS DO-8 (SS) 4 (9) R 4VAC (R) Yellow (5) X DO-7 (X) (8) Comp B Alarm LC (LC ) Brown (5) ransformer 4V 0 9 8 7 5 Compressor ( Circuit B ) Current Switch CSB Blue 4 J8 5VDC 0 9 8 7 5 D09 4 GROUND 4VAC Com 4VAC AI 4 White/Red (80) White/Red (80) 5 White/Red (8) White/Red (8) - AI5 + 7 White/Blue () White/Blue (4) White/Blue () D08 NOE 7 White/Blue (4) - AI4 + 8 AI A4 A4 A4 D07 A A5 A5 A AI 5VDC AI LED 5VDC 4 5 D0 A A A A 7 8 A A A D05 D04 J 9 PWM an /White (8) 40 PWM Com 4 PWM an /White (8) J0 4 4VAC Com White () 4 DI Johnson FX-0 White (7) 44 DI SFS D0 Gray (48) 45 DI0 NOE Orange (47) 4 DI9 A5 Compressor ( Circuit A ) Blue Red Blue an (5A) Unit Supply # 08-0/0/ Pink CCA G L L L J9 (54) 49 DI /4/5// Com Blue (7A) 50 DI NOE Red (55) 5 DI5 NOE Gray (5) 5 DI4 Blue (7B) 5 DI D0 ES Brown (57) 54 DI NOE 9 Pink (58) 55 9VDC LFS Gray (59) 5 DI EX J7 (7A) (4A) HP-A (74A) 5 (5A) /Orange (7B) /Orange (4B) HP-B /Orange (74B) /Orange (5B) Blue/Wht (7B) Blue (7B) LP-B Blue/Wht (49B) 8 Blue (7A) Blue (7A) LP-A Blue (49A) 7 (49) Orange Orange/Wht (B) 4 (A) Orange (B) RV Orange/Wht (0B) NOE 8 Orange (A) RV Orange (0A) Orange (0) EL an /White (8) an /White (8) an /White (8) 0 an /White (8) LS CS-A CS-B Brn/Blk (4) Circuit A Circuit B Brn/Blk (4) Brn/Wht (87) Main Board Connection A A A A4 J 4 Vac 4 Vac Com DO 4 Vac DO5 DO4 4 Vac DO AI EXP 5Vdc 5 Vdc Com AI EXP 5Vdc J 5Vdc Com 5Vdc AI EXP 5Vdc Com 5Vdc AI4 EXP 5Vdc Com J 7 5 4 0 0 4 5 7 8 9 0 A A A4 A A A A A4 Johnson FX0 Expansion Board S-WC Circuit A L-WC Circuit A S-WC Circuit B L-WC Circuit B (F0) (F9) (F8) (F7) (F) (F5) (F4) (F) (F) (F) (F0) (F9) (F8) (F7) (F) (F5) (F4) (F) (F) (F) 0 9 8 7 5 4 Yellow/Red (5) 9 Yellow/Red () Yellow/Red (5) 0 Yellow/Blue (7) Yellow/Red () Yellow/Blue (8) 0 Yellow/Blue (7) an / (84) Yellow/Blue (8) an / (85) an / (84) 0 an / (85) Yellow (4) Yellow Yellow Yellow PB Red NOE 08V Blue 0V (95) /White Yellow LC Comp A Alarm (LC ) Brown (5) X Acc NOE 4 (X) Blue (5) Y COMP Blue (45) 0 (Y) Y COMP (Y) Blue (4) (O/B) O/B REV VALVE NOE 8 G NO USED (G) AIC NO USED (AIC) SC NO USED (SC) L NO USED (L) O NO USED (O) (0) 7/8/09 (9) /White () Orange (47) Notes Yellow () Yellow (5) (8) /White () Brown (5) Brown (5) ES Green/Yellow () PB Brn/Wht (8) - Swap Red and Blue ransformer wires for 08V operation. - Disconnect for 5 degree F source side freeze detection - Disconnect for 5 degree F load side freeze detection 4 - Acc output is cycled with the lead compressor. 5 - If no flow proving switch is being used on the load side, the input must be jumpered to PB- for the unit to operate. - If no flow switch is being used on the source side, the input must be jumpered to R on PB- for the unit to operate. 7 - Jumpers must be set as shown for correct control operation. If a communication card is present, it must be removed to check the jumpers. L (70A) (75A) Blue (5) (75A) /Org (75B) Violet (7) Violet () CC-B CC-A /White (7) /White (7) Connect to R on PB- Blue (4) 47 DI8 Blue (45) 48 DI7 D0 Blue (45) Blue (4) Orange (47) White (7) White () Orange (0) (70A) (75A) /Org (70B) /Org (75B) /Org (70B) Orange (A) /Org (75B) Current Switch CSA 8 - Reversing Valve will be energized for cooling mode. 9 - Used for Emergency Shutdown in conjunction with a normally open relay 0 - External load and source pumps must be externally fused. Red Red PB Red Red Red Red BLACK WIRE HARNESS NOE 5 Orange (A) Pink Blue (50) Orange (0) White () /Org (70B) (70A) White (7) Blue Red Blue Load Pump L Pink External NOE 0 Source Pump CCP L Green/Yellow () an (5B) Blue (50) CC-P /White () Run Winding CCB GeoStart Pink Active Unit Supply # 08-0/0/ EX /White () Run Winding IntelliStart Active Start Winding G L L Blue Start Winding Common Winding L L Common Winding White (8) AWB Blue (7) 0V AWB 7 9 8 5 4 7 S R C 8 4 9 5 S R C G G A 9 8 7 5 4 B 5 4 9 7 8 4 5 7 8 D0 D0 D07 D08 (A) (A) White (B) White (B) 0

Wiring Schematics cont. 40/0/ Legend CC Compressor Contactor LP Low Pressure CS Current Switch LS Leaving Source emp EL Entering Load emp L-WC Load Water Coil emp ES Emergency Shutdown PB Block ES Entering Source emp RV Reversing Valve HP High Pressure SFS Source Flow Switch LFS Load Flow Switch S-WC Source Water Coil emp Leaving Load emp B erminal Board B C 4VAC COM (C) RS DO-9 (0) 5 (RS) SS DO-8 (9) 4 (SS) R 4VAC (R) Yellow (5) X DO-7 (8) (X) Comp B LC (LC ) Alarm Brown (5) LC Comp A Alarm (LC ) Brown (5) X Acc NOE 4 (X) Blue (5) Y COMP Blue (45) 0 (Y) Y COMP ransformer 4V White (7) SFS Connect to R on PB- Gray (48) NOE Orange (47) Blue (4) NOE Gray (5) PB Blue (7B) ES Brown (57) NOE 9 Pink (58) (Y) LFS 5 Blue (4) 7 8 - + - (O/B) O/B REV VALVE NOE 8 5VDC + - + - + GROUND 4VAC Com 4VAC J8 J 9 40 4 J0 4 4 44 45 4 47 48 J9 49 Compressor ( Circuit B ) Red 50 5 5 5 54 55 5 D09 D08 D07 D0 D05 D04 D0 D0 D0 0 9 8 7 Yellow 5 4 AI 0 9 8 7 - AI5 + 5 4 NOE 7 - AI4 + AI A4 A4 A4 AI 5VDC A A5 A A A5 A A A AI LED 5VDC A A A PWM PWM Com PWM A5 4VAC Com DI Johnson FX-0 DI Compressor ( Circuit A ) Red Unit Supply # 40/0/ DI0 G L L L L EX DI9 (7A) (4A) DI8 DI7 DI /4/5// Com HP-A (74A) 5 (5A) /Orange (7B) /Orange (4B) DI HP-B /Orange (74B) /Orange (5B) Blue/Wht (7B) Blue (7B) LP-B DI5 Blue/Wht (49B) 8 Blue (7A) Blue (7A) LP-A Blue (49A) 7 (49) DI4 Orange Orange/Wht (B) 4 (A) Orange (B) RV Orange/Wht (0B) DI NOE 8 Orange (A) RV Orange (0A) Orange (0) EL an /White (8) an /White (8) an /White (8) 0 an /White (8) LS CS-A CS-B Brn/Blk (4) Circuit A Circuit B Brn/Blk (4) DI 9VDC DI Brn/Wht (87) 4 J7 Main Board Connection A A A A4 J 4 Vac 4 Vac Com DO 4 Vac DO5 DO4 4 Vac DO AI EXP 5Vdc 5 Vdc Com AI EXP 5Vdc 5Vdc Com 5Vdc AI EXP 5Vdc Com 5Vdc AI4 EXP 5Vdc Com J J 7 5 4 0 0 4 5 7 8 9 0 A A A4 A A A A A4 Johnson FX0 Expansion Board S-WC Circuit A L-WC Circuit A S-WC Circuit B L-WC Circuit B White/Red (80) White/Red (80) White/Red (8) White/Red (8) White/Blue () White/Blue (4) Yellow/Red (5) Yellow/Red () Yellow/Blue (7) Yellow/Blue (8) an / (84) White/Blue () White/Blue (4) Yellow/Red (5) Yellow/Red () Yellow/Blue (7) Yellow/Blue (8) an / (84) an / (85) an / (85) 0 4 5 7 8 9 0 CCB L L L Current Switch CSB Blue (F0) (F9) (F8) (F7) (F) (F5) (F4) (F) (F) (F) (F0) (F9) (F8) (F7) Orange (47) G NO USED (F) (F5) (F4) (F) (F) (F) 0 9 8 7 5 4 0 Yellow /White Yellow PB Yellow (4) Yellow Yellow (95) (G) AIC NO USED (AIC) SC NO USED (0) (SC) (9) Yellow (5) (8) L NO USED (L) O NO USED (O) Notes 7/8/09 /White () Yellow () Brown (5) Brown (5) /White () Green/Yellow () ES Brn/Wht (8) Yellow CCA Blue (45) (54) NOE Red (55) Gray (59) Blue (5) (75A) /Org (75B) Violet (7) Violet () CC-B /White () CC-A /White (7) /White (7) Blue (45) Blue (4) Orange (47) White (7) White () Orange (0) (70A) (75A) /Org (70B) /Org (75B) L (70A) (75A) /Org (70B) /Org (75B) Orange (A) an /White (8) an /White (8) White () Blue (7A) BLACK WIRE HARNESS Orange (A) Blue (50) Not Used Orange (0) White () /Org (70B) (70A) White (7) - Disconnect for 5 degree F source side freeze detection - Disconnect for 5 degree F load side freeze detection 4 - Acc output is cycled with the lead compressor. 5 - If no flow proving switch is being used on the load side, the input must be jumpered to PB- for the unit to operate. - If no flow switch is being used on the source side, the input must be jumpered to R on PB- for the unit to operate. 7 - Jumpers must be set as shown for correct control operation. If a communication card is present, it must be removed to check the jumpers. L 8 - Reversing Valve will be energized for cooling mode. Current Switch 9 - Used for Emergency Shutdown in conjunction with a normally open relay CSA NOE 5 Factory low voltage wiring Factory line voltage wiring Open Jumper Field low voltage wiring Field line voltage wiring Closed Jumper Optional block Field Supplied Option ¼ Quick Connector hermistor Ground Relay coil Unit Supply # 40/0/ G L L L EX Green/Yellow () 7 7 9 8 5 4 8 4 9 5 A 9 8 7 5 4 B 5 4 9 7 8 4 5 7 8 D0 D0 D07 D08 (A) (A) White (B) White (B)

(70A) (75A) Field Wiring and Control Setup Current Switch CSA Figure - High Voltage Unit Connections Supply # 40/0/ hree Phase Single Phase Unit Supply Unit Supply # 08-0/0/,40/0/, 08-0/0/ G or 575/0/ G L G L L L L PB L L L L L Unit Supply # 08-0/0/ G L L L L Line Voltage High Voltage Connections Connect power wiring as shown in Figure. 08 Volt Operation Switch red and blue transformer wires for 08V operation. Figure - Low Voltage Connections B 4VAC R Red () Red () Yellow () Yellow (5) () (4) CCA R ypical -Stat 4VAC CCB Low Voltage Operation hermostat/controller (Aquastat) A two-stage 4 VAC thermostat or liquid controller (field supplied) must be used to turn the NDW on or off, and to switch it from cooling to heating if necessary. Multiple NDWs in the same bank must be controlled from one thermostat/controller (must be isolation relays for multiple unit applications). 4V COM Comp Comp C Y Y EX C Y Y 4V COM Comp Comp Low Voltage Connections Connect low voltage thermostat wiring as shown in Figure. Connections shown are for typical thermostat. Actual connections may vary with specific device used. Rev Valve Acc O/B X B Rev Valve NOE: If a separate transformer is used to supply a Y, Y, or B signal to the unit controls, isolation relays must be used. Acc Alarm Circuit Alarm X L CAUION: Use only copper conductors for field installed wiring. erminals in the unit are not designed for other types of conductors. Circuit Alarm LC LC NOES: ) Acc Output is cycled with the lead compressor ) Acc Output is cycled with the lag compressor Figure 4 - Wiring Schematic Connect to R on PB- PB NOE 9 NOE ES LFS SFS NOE NOE NOE 5 Accessory Item White () White (7) Gray (48) Orange (47) Blue (4) Blue (45) (54) Blue (7A) Red (55) Gray (5) Blue (7B) Brown (57) Pink (58) Gray (59) J0 4 4 44 45 4 47 48 J9 49 50 5 5 5 54 55 5 4VAC Com DI DI DI0 DI9 DI8 DI7 DI /4/5// Com DI DI5 DI4 DI DI 9VDC DI WARNING: All wiring must comply with local and state codes. Disconnect the power supply before beginning to wire to prevent electrical shock or equipment damage. NOE: Accessory output is selectable as normally open or normally closed using the unit display. Normally closed is the factory default setting. Source Flow Switch (SFS) Unit is factory shipped with jumpers on the Source Flow Switch pins J0-45 (entering). Flow proving switch is optional, hook up as shown in Fig. 4 and Note. he unit will not operate without a flow proving switch or jumper installed. Load Flow Switch (LFS) Unit is factory shipped with jumpers on the Load Flow Switch pins J9-5 (leaving). Flow proving switch is optional, hook up as shown in Fig. 4 and Note 5. he unit will not operate without a flow proving switch or jumper installed. Load and Source Pump he load or source pump connection allows for 4. A at 08/0/ on each (08/0/ models only). his pump supply should be adequate for most applications. Please consult the electrical schematic and table for more detail.

Field Wiring and Control Setup cont. Accessory Relay Setup he accessory output set to close upon Y compressor call (compressor is delayed 90 sec. after Y) but can be set to open with Y. o change ACC: On FX0 control using the left and right arrow keys, scroll to PASSWORD menu (password 57 ) Once you have entered the password scroll to MAIN menu. Using up and down keys, scroll to Acc Sel hit ENER and ON Comp begins flashing Using up and down keys, select ON Comp for activation with Y Call or OFF Comp for deactivation with Y Lead/Lag Selection Compressor Lead/Lag Selection is factory set to OFF but can be set to ON. o change Lead/Lag On/Off: On FX0 control using the left and right arrow keys, scroll to PASSWORD menu (password 57 ) Once you have entered the password scroll to MAIN menu Using up and down keys, scroll to LEAD/LAG SELEC hit ENER and OFF begins flashing Using up and down keys, select ON for activation or OFF for deactivation Lead/Lag ime - Runtime in Hours Compressor Lead/Lag ime is factory set 4 hours but can be set from to 00 hours. o change Lead/Lag ime: On FX0 control using the left and right arrow keys, scroll to PASSWORD menu (password 57 ) Once you have entered the password scroll to MAIN menu. Using up and down keys, scroll to LEAD/LAG IME hit ENER and LEAD/LAG IME begins flashing Using up and down keys, select - 00 HOURS. or C - Unit of Measure Degrees Fahrenheit is factory set, however degrees Celsius can be selected using the following procedure: o Change Unit of Measure: On FX0 control using up and down keys, scroll to SEINGS Using up and down keys, scroll to UNI OF MEASURE hit ENER and UNI OF MEASURE begins flashing Using up and down keys, select F for degrees Fahrenheit or C for degrees Celsius Other Field Options Other field selectable options are available as shown in the maintenance menu on page 4 of the FX0 control using a similar procedure as shown in the above examples. hese would include thermostat enabling, and emergency shutdown. See page 4 for details. DDC Operation and Connection Consult AGFX0 Manual for application details.

Control Features Anti Short Cycle High Pressure Protection Low Pressure Protection Advanced Freeze Detection Setpoint Random Start Display for diagnostics Reset Lockout at disconnect Intelligent reset for field installed flow switches Accessory output Optional DDC control add-on Compressor Lead/Lag Compressor Current Switches Field Selectable Options Freeze Detection Sensing Select (DI-4 and DI-5) he freeze detection temperature sensing selection inputs allow the user to adjust the setpoints. he source sensors are wired to inputs AI- and AI-4 while the load sensors are wired to inputs AI-5 and AI-. he setpoints for both, the load and source, are factory set for 0. In order to change the setpoint to 5 on the source, remove the jumper wire from DI-4 (wire #5). he load setpoint can be changed by removing the jumper wire from DI-5 (wire #55). Accessory Output (DO-4) he accessory Output will be energized 90 seconds prior to the lead compressor output being energized. When the lead compressor output is turned off the accessory output will be deactivated immediately. he output is selectable for normally open or normally closed operation through the unit mounted user interface or from a building automation system. Control and Safety Features Emergency Shutdown he emergency shutdown mode can be activated by a command from a facility management system or a closed contact on DI-. he 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 deactivated. he first time the compressor starts after the emergency shutdown mode has been deactivated, 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, heating freeze detection, cooling freeze detection, and compressor current sensor. 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 are recognized during a single heating or cooling demand, the unit will go into lockout mode, turning off the compressor and enabling the alarm output until the controller is reset. he fault count will automatically reset when the heating or cooling command becomes satisfied. If a fault occurs on a dual compressor unit, the other compressor will continue to operate based on the heating or cooling demand. he lockout condition can be reset by powering down the controller, by a command from the facility management system, or by holding both the enter and escape keys on the optional user interface. Advanced Freeze Detection System he NDW source and load heat exchangers are protected by a multi-sourced temperature logic strategy. he temperature logic is based upon the refrigerant temperature sensed as the refrigerant is about to enter the heat exchanger; while entering and leaving water temperatures are being used as correlating factors. he detection scheme is shown as basic and advanced algorithms. Basic Freeze Detection Operation: Comp or Comp Freeze Alarm his alarm can be triggered by one of two detection schemes. Hard Limit Freeze Detection If the refrigerant temperature drops below the freeze detection setpoint by.8, the associated compressor is locked out immediately regardless of any other factors and requires a manual reset. NOE: his Lockout produces a Comp or Comp Freeze error on the MUI display. Freeze Detection he refrigerant temperature is compared to the freeze detection setpoint (5 [antifreeze] or [water] field selectable), and if the temperature falls below the setpoint for 0 continuous seconds, the associated compressor will be halted. his function becomes enabled after the first two minutes of compressor operation. hree such events in 0 minutes will trigger a compressor lockout that requires a manual reset. NOE: his Lockout produces a Comp or Comp Freeze error on the MUI display. In addition to the above: Entering Water emperature Influence If the entering water temperature of the evaporative heat exchanger is within 0 of the freeze setpoint, the previously mentioned two minute delay will be eliminated. his allows the freeze detection to operate immediately when the compressor starts based on entering water temperature. Leaving Water emperature Influence If the leaving water temperature of the evaporative heat exchanger is within 0 of the freeze setpoint, the previously mentioned 0 second delay will begin to be proportionately reduced, ending at a second delay when the leaving water temperature is.5 above the freeze setpoint. 4

Control Features cont. Dual Circuited Heat Exchanger Protection A low temperature condition on either refrigerant circuit will prevent the start of both compressors. If the low temperature condition exists for 5 minutes when both compressors are off, a lockout is triggered for both compressors. However, if for instance-both compressors are operating and circuit experiences a refrigerant temperature below the freeze detection setpoint such that compressor is halted, compressor will not be halted as a result. Advanced Freeze Detection Operation: Pre Freeze Alarm Predictive freeze condition detection: If the refrigerant temperature is within 7. of the freeze detection setpoint, the predictive freeze detection algorithm is enabled, and if the logic determines that a freeze condition is likely to happen based on current conditions, the compressor of the involved refrigerant circuit is immediately stopped. hree () such events in 0 minutes will trigger a compressor lockout that requires a manual reset. In the absence of such a condition, the compressor is allowed to operate so that the refrigerant temperature may eventually be at the threshold of the freeze detection setpoint. NOE: his Lockout produces a Pre Freeze detection error on the MUI display. Capacity Limiting If the leaving water temperature drops to.8 above the freeze detection setpoint, the lead compressor is halted. When the leaving water temperature rises to. above the freeze detection setpoint, it will be allowed to resume operation. his limiting is allowed to repeat indefinitely. his causes COMP Low Limit to be displayed on the MUI. If the leaving water temperature drops to the freeze detection setpoint, the lag compressor is halted. When the leaving water temperature rises to.8 above the freeze detection setpoint, it will be allowed to resume operation. his limiting is allowed to repeat indefinitely. his causes COMP Low Limit to be displayed on the MUI. Compressor Current Switch (AI- EXP and AI-4 EXP) he compressor current switch is designed to insure that the compressor is on when the compressor output is energized. his switch is normally open and closes when current is flowing to the compressor. If the compressor fails to start the switch will open. he switch must be open for a continuous 5 seconds for a fault to occur. After faults in 0 minutes the control will put the unit into an alarm state. Optional Flow Proving Switch (DI- and DI-0) he load and source flow-proving switches are optional and can be field installed. hese switches shall be normally open flow switches that will close when the water flow through the heat exchangers reach an acceptable level. he flow-proving switches must be closed 5 seconds prior to enabling either compressor output (DO- and DO-). If the load flow-proving switch opens at any time both compressor outputs (DO- and DO-) must be disabled immediately. High Pressure (DI- and DI-) he high-pressure switches shall be a normally closed (NC) switch that monitors the systems compressor discharge refrigerant pressures. here shall be an individual high pressure switch for each circuit. If the input senses the high-pressure switch is open during the period that the compressor output is enabled, it must shut down the compressor immediately and count the fault. he compressor minimum on time does not apply if the highpressure switch trips. he compressor will not restart until the short cycle time delay has been satisfied. If the highpressure fault occurs in one circuit the other compressor will continue to operate based on the heating or cooling demand. Low Pressure (DI- and DI-) he low-pressure switches shall be a normally closed (NC) switch that monitors the systems compressor suction line refrigerant pressure. he input shall be checked 5 seconds before compressor start up to insure the pressure switch is closed and then ignored for the first minutes after the compressor output (DO- or DO-) is enabled. If the switch is open continuously for (0) seconds the compressor output for that circuit will be disabled. he compressor will not restart until the short cycle time delay has been satisfied. If a low-pressure fault occurs in one circuit the other compressor will continue to operate based on the heating or cooling demand. Compressor Alarm Output (DO-5) he compressor alarm output will be enabled when stage is in the lockout mode and will be disabled when the lockout is reset. Compressor Alarm Output (DO-) he compressor alarm output will be enabled when stage is in the lockout mode and will be disabled when the lockout is reset. est Mode he unit controls system can be put into test mode to eliminate startup delays to aid in trouble shooting. o put the unit into test mode hold the ESC and Down Arrow keys until LED 8 begins to flash. he control will remain in test mode until power is cycled or after 0 minutes. 5

Sequence of Operation Fail Restart When the controller is first powered up, the outputs will be disabled for a random start delay time (See Random Start Delay). he delay is provided to prevent simultaneous starting of multiple heat pumps. Once the timer expires, the controller will operate in the occupied mode until it is commanded to another mode by a facility management system or a remote thermostat. A restart status variable is available for indication of this occurrence. Random Start Delay his delay will be used after every power failure, as well as the first time the compressor(s) is started after the control exits the emergency shutdown mode. he default time period for the start delay will be random between and 0 seconds. Compressor Fixed On Delay ime he Compressor Fixed On Delay ime will ensure that the compressor output is not enabled for (90) seconds after the control receives a call to start the compressor. Compressor Minimum On Delay he compressor minimum on delay will ensure that the compressor output(s) are enabled for a minimum of () minute each time the compressor output is enabled. his will apply in every instance except in the event the highpressure switch is tripped or emergency shutdown, then the compressor output will be disabled immediately. Compressor Short Cycle Delay ime he compressor short cycle time delay will ensure that the compressor output will not be enabled for a minimum of five (5) minutes after it is disabled. his allows for the system refrigerant pressures to equalize after the compressor is disabled. Compressor Stage Lead Lag he factory setup software, a facility management system, Service/Commissioning ool, or a user interface can be used to select compressor lead lag option for the compressors. he factory setup software, a facility management system, Service/Commissioning ool, or a user interface must also be used to select the number of run time hours the compressors will lead before being switched, the factory default will be 4 hours. he two compressors will still be staged depending on load when the lead lag option is enabled. Heating Cycle During the heating cycle, the reversing valves will be positioned for heating operation. he thermostat or aquastat will command the reversing valves Off for heating. If the compressor short cycle time delay has been satisfied, the lead compressor will turn on after the accessory output has been enabled, the low pressure switches has been verified, and the fixed compressor start delay timer has been satisfied. When heating is no longer required, the compressor will be turned off immediately after the compressor minimum on delay has been satisfied. After the compressor output is turned off, it will remain off for the time specified in the compressor short cycle time delay. If the dual compressor option is selected, the compressors will be sequenced to maintain the heating setpoint. As the temperature drops below the heating setpoint and begins to operate in the heating proportional band, the first stage compressor will be activated. If the first stage compressor is not able to satisfy the heating demand, the second stage compressor will be activated by the thermostat or aquastat. he controller is allowed to operate the heat pump in the heating mode regardless of the outdoor air temperature. Cooling Cycle During the cooling cycle, the reversing valves will be positioned for cooling operation. he thermostat or aquastat will command the reversing valves On for cooling. If the compressor short cycle time delay has been satisfied, the lead compressor will turn on after the accessory output has been enabled, the low pressure switches has been verified, and the fixed compressor start delay timer has been satisfied. When cooling is no longer required, the compressor will be turned off immediately after the compressor minimum on delay has been satisfied. After the compressor output is turned off, it will remain off for the time specified in the compressor short cycle time delay. If the dual compressor option is selected, the compressors will be sequenced to maintain the cooling setpoint. As the temperature drops below the cooling setpoint and begins to operate in the cooling proportional band, the first stage compressor will be activated. If the first stage compressor is not able to satisfy the cooling demand, the second stage compressor will be activated by the thermostat or aquastat. he controller is allowed to operate the heat pump in the cooling mode regardless of the outdoor air temperature.

Inputs and Outputs Configuration DUAL SAGE WW Input Name Input Output Name Output Entering Load Water emperature AI Compressor DO Leaving Load Water emperature AI Compressor DO Source Heating Freeze Detection AI Reversing Valve DO Source Heating Freeze Detection AI 4 Accessory DO4 Load Cooling Freeze Detection AI 5 Compressor Alarm DO5 Load Cooling Freeze Detection AI Compressor Alarm DO Network Output DO7 Load Flow Proving Switch DI Network Output DO8 Emergency Shutdown DI Network Output D09 Stage Low Pressure DI Source Htg Freeze Detection Select - 0ºF DI 4 Future PWM Load Htg Freeze Detection Select - 0ºF DI 5 Future PWM Stage Low Pressure DI hermostat Y DI 7 hermostat Y DI 8 hermostat B DI 9 Source Flow Proving Switch D0 Stage High Pressure DI Stage High Pressure DI XP0 Expansion Card Input Name Input Output Name Output Entering Source Water emperature AI Unused DO Leaving Source Water emperature AI Unused DO Current Switch - Compressor AI Unused DO Current Switch - Compressor AI 4 Unused DO 4 Networking Protocol he Johnson FX0 Board is specifically designed for commercial heat pumps and provides control of the entire unit as well as input ports for Open N, Lontalk and BACnet communications protocols as well as an input port for a user interface. For more information on the specifics of each protocol refer to the application guide AGFX0. 7

Unit Display and Interface he Unit Display allows the user to view entering and leaving water temperatures, freeze detection readings, inputs and outputs, and allows the user enable and disable certain control functions through the various menus. he interface also displays all faults on the LCD once the unit has locked out to aid in diagnostics. here are 0 LED indicator lights that indicate the following: - Shows that the FX processor is operational Figure 5 - Unit Display/Interface! Alarm - Lights when there is a LEDs lock-out or faulty freeze detection sensor - Flashing shows Compressor is running - Flashing shows Compressor is running - On shows Compressor is lead 4 - On shows Reversing valve in cool 8 - On shows unit in est mode Directional Keys Escape Key Return Key MUI Menu Navigation for NDW Welcome Info emp Stat Outputs Settings Alarm ALM_History Password Maint Info WFI Envision Dual Compressor Water-to-Water PRODCWWE-0B MM/DD/YY emp emperatures Enter Load 77. Leave Load 5.0 Enter Source 70.0 Leave Source.0 Source Frz 77.8 Source Frz 0.0 Load Frz 0.0 Load Frz 0.0 Src Frz Setpt 0.0 LD Frz Setpt 0.0 Stat Status Unit Status Auto Y Status OFF Y Status OFF O Status OFF Emerg Shutdown OFF Current Sens OFF Current Sens OFF Load Flow OFF Src Flow OFF Low Pres ON Hi Pres OFF Low Pres ON Hi Pres ON Comp Low Limit NML Comp Low Limit NML Outputs Outputs Comp Status Comp Status Lead Acc Status Stg Status Stg Status BO7 BO8 BO9 EXPB0 EXPB0 EXPB07 EXPB08 ON OFF Comp OFF Normal Normal OFF OFF OFF OFF OFF OFF OFF Settings Settings Unit of Measure F 8