NXW Reversible Chiller Installation Manual

Transcription

1 NXW to 0 ons Commercial Reversible Chiller - 0 Hz Installation Information Water Piping Connections Electrical Data Microprocessor Control Startup Procedures Preventive Maintenance NXW Reversible Chiller Installation Manual 00WN 0/0

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3 able of Contents Model Nomenclature.... General Installation Information... - Physical Dimensions Physical Data... 9 Field Connected Water Piping Water Quality... System Cleaning and Flushing.... Electrical Data...- Wiring Schematics....- Field Wiring and Control Setup Control Features... - Sequence of Operation.... Inputs and Outputs Configuration... Networking Protocol.... Unit Display and Interface Reference Calculations... Legend... Unit Startup... Operating Parameters Compressor Resistance... 9 Pressure Drop....0 Heat of Extraction/Rejection Data... roubleshooting.... Heating and Cooling Cycle Analysis... Startup and roubleshooting Form... Preventive Maintenance... Service Parts List... -

4 NXW REVERSIBLE CHILLER Model Nomenclature NXW 0 R P F N N SS A Family NXW = Envision Series Water-to-Water Capacity MBUH see model size table Operation R = Reversible Voltage = 0-0/0/* = 0/0/ = 7/0/ = 0/0/ Phase protection P = Phase Guard Chassis E = Enclosed F = Open Frame *0-0/0/ is not available on NXW0. Model Size Nominal ons Vintage A = Current B = 0 & 0 Non-Standard Options SS = Non-Standard Future Use N = Future Use Future Use N = Future Use Controls = 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 0 0/0/09

5 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. 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. 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.

6 General Installation Information cont. Mounting Units Remove the unit from the wooden shipping skids (see Figures and ). Units will be shipped with heavy duty rubber grommets to reduce sound that can be transmitted through the floor via the frame (see grommets below). For additional sound attenuation, use heavy duty spring isolation that can reduce sound levels by dba (see springs below). Figure : Unit Without Enclosure Figure : Unit With Optional Enclosure (NXW0 shown) Grommets Standard Remove wooden shipping skids CAUION: A minimum of clearance should be allowed for service access. Unpacking the Unit Remove the stretch warp and protective cardboard from the unit. Where applicable, remove the compressor shipping brackets located at the base of each compressor. o do so, lift up the bottom of the compressor sound jacket and remove the two bolts that hold the bracket (see Figure a). Discard the brackets. On NXW0, the hold down shipping bolts should then be removed and discarded (Figure b). Figure a: Removing Shipping Brackets Heavy Duty Mounting Springs Optional IS--0 (NXW09-0) IS-70-0 (NXW0) Figure b: Removing Shipping Bolts Compressor Shipping Bracket (one on each side of both compressors) Remove shipping bolts, brackets and all related hardware

7 Physical Dimensions Without Enclosure (0 SHOWN) ELECRICAL (LINE VOLAGE) SOURCE WAER OU ELECRICAL (LOW VOLAGE) H SOURCE WAER IN A G D ELECRICAL (LOW VOLAGE) LOAD WAER IN LOAD WAER OU K F OP E B C FRON RIGH SIDE BACK J (WAER LINE LOCAIONS) Dimensional Data for unit without enclosure Model A B C D E F G H J K [9] [7] [9] [9] [] [] [0] [] [] [] [0] [7] [70] [07] [] [] [] [] [] [9] [77] [7] [] [] [] [] [9] [] [] [0] All dimensions in inches, [mm] All water connections are Victaulic /9/09 7

8 Physical Dimensions With Enclosure B (0 SHOWN) SOURCE WAER OU ELECRICAL (LOW VOLAGE) SOURCE WAER IN A ELECRICAL (LOW VOLAGE) LOAD WAER IN LOAD WAER OU OP FRON C H RIGH SIDE BACK (WAER LINE LOCAIONS) Dimensional Data for unit with enclosure Model A B C D E F G H [7] [] [9] [] [] [0] [] [] [0] [0] [70] [] [] [] [] [0] [0] [07] [0] [] [] [9] [] [7] All dimensions in inches, [mm] All water connections are Victaulic /9/09 G F E D

9 Physical Data Model Configuration Compressor with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure with enclosure without enclosure Refrigerant Charge* Weights shown in lbs [kg] *Refrigerant per circuit in lbs [kg] Add lbs [ kg] for fluid weight when full. (09-0) Add lbs [ kg] for fluid weight when full. (0-0) Add lbs [ kg] for fluid weight when full. (0-0) Add lbs [9 kg] for fluid weight when full. (0) Add 0 lbs [0 kg] for fluid weight when full. (0) otal Weight Corner Weights Shipping Installed Front Left Rear Left Front Right Rear Right Scroll ().0 [.] 70 [0] 7 [] [] 7 [79] [] 79 [] Scroll ().0 [.] [] 7 [] [] [70] [] 9 [7] Scroll (). [.9] 70 [0] 7 [] [] 7 [79] [] 79 [] Scroll (). [.9] [] 7 [] [] [70] [] 9 [7] Scroll (). [.] 70 [0] 7 [] [] 7 [79] [] 79 [] Scroll (). [.] [] 7 [] [] [70] [] 9 [7] Scroll (). [.] 7 [] [97] [] [] [] [] Scroll (). [.] [9] 7 [] [] [7] [7] [7] Scroll () 7.0 [.] 79 [9] 9 [] [9] 9 [7] [70] 9 [] Scroll () 7.0 [.] 9 [] [77] 9 [9] 7 [7] [] 7 [79] Scroll () 7. [.] [7] 77 [9] [7] 0 [9] [7] 09 [9] Scroll () 7. [.] 7 [] 77 [07] 70 [77] 0 [9] 7 [7] [97] Scroll () 7. [.] [7] 77 [9] [7] 0 [9] [7] 09 [9] Scroll () 7. [.] 7 [] 77 [07] 70 [77] 0 [9] 7 [7] [97] Scroll (). [.] [0] 07 [7] [] [9] 0 [] 9 [] Scroll (). [.] 9 [7] [0] [97] [0] 0 [00] [0] Scroll (). [9.] 90 [7] [] 9 [] 9 [70] [0] [] Scroll (). [9.] 0 [0] 70 [7] [] 7 [7] [] [9] /9/09 9

10 Field Connected Water Piping General System piping should be kept as simple as possible to minimize the pressure drop, but hand valves should be field installed to facilitate unit servicing. he piping installation should provide service personnel with the ability to measure and/or monitor water temperatures and pressures. Source and load fluid connections are provided with -inch [0.mm] Victaulic grooved nipples (see Figure ). Each nipple will also have a P port installed for test and balance purposes. It will be the installing contractor s responsibility to adequately support incoming piping to avoid damage to the unit s piping or heat exchangers. he water lines should be routed so as not to interfere with access to the unit. For any installation where the transmission of vibration through the piping connections could cause unacceptable noise levels in occupied spaces it is important to provide adequate vibration damping. One method is to use the optional Adapter Hose Kit (kit number KCS-). his Kit consists of four pieces of a braided stainless steel flexible hose with a Victaulic connection on one end and a MP connection with pipe union on the other. Overall length of each piece is. NOE: Units are factory run-tested using propylene glycol. Prior to connecting piping to unit, thoroughly flush heat exchangers. Figure : Water Connections (NXW0 shown) Figure : Chiller Back View (NXW0 shown) Brazed Plate Heat Exchanger P/ Plug Victaulic Grooved Nipples Optional Connection Kit CKV0FL (Includes four of each) Out In Water Connection Ports In KCS- ( of ) Out CAUION: Remove the plastic protective caps in the ends of each of the four water pipes on the heat exchangers prior to piping connection. Failure to remove the caps will result in serious damage and could void the warranty. 0

11 Field Connected Water Piping cont. Before final connection to the unit, the supply and return hose kits must be connected to each other, bypassing the unit, 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. 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 [0.0 LPS per kw] (source side) is recommended. Antifreeze in the loop is strongly recommended. he proper water flow must be delivered to each unit whenever the unit heats or cools. he proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-to-water heat exchanger. A GPM flow rate per ton [0.0 LPS per kw] of cooling capacity (. GPM per ton [0.00 LPS per kw] minimum) is required. NOE: he placement and connection of the water circulating pump(s) must be taken into consideration prior to designing the final water piping systems. Closed Loop ower/boiler Systems he water loop is usually maintained between 0 F [. C] and 90 F [. C] for proper heating and cooling operation. his is accomplished with a cooling tower and a boiler. 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. 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 F [. C] with a full flow of GPM per ton [0.0 LPS per kw]. Under this scenario, the evaporating temperature can fall outside of the compressor operating window. o allow the system to operate correctly, restricting the source side flow when the evaporating temperature exceeds F [.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 F [. C]. CAUION: Water piping exposed to outside temperature may be subject to freezing. Open Loop Well Water Systems Installation of an open loop system is not recommended without using a secondary heat exchanger unless water quality guidelines are met.

12 Water Quality General Reversible chiller systems may be successfully applied in a wide range of 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 0-0 mesh (0-00 microns) are recommended, with 0 mesh (00 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 Scaling Calcium and Magnesium Carbonate (otal Hardness) less than 0 ppm (otal Hardness) less than 0 ppm (otal Hardness) less than 0 ppm Corrosion Iron Fouling (Biological Growth) Erosion Hydrogen Sulfide Less than. ppm (rotten egg smell appears at 0. PPM) 0-0 ppm Less than ppm Sulfates Less than ppm Less than ppm Less than 00 ppm Chlorine Less than. ppm Less than. ppm Less than. ppm Chlorides Less than 0 ppm Less than ppm Less than 00 ppm Carbon Dioxide Less than 0 ppm 0-0 ppm 0-0 ppm Ammonia Less than ppm Less than ppm Less than 0 ppm Ammonia Chloride Less than. ppm Less than. ppm Less than. ppm Ammonia Nitrate Less than. ppm Less than. ppm Less than. ppm Ammonia Hydroxide Less than. ppm Less than. ppm Less than. ppm Ammonia Sulfate Less than. ppm Less than. ppm Less than. ppm otal Dissolved Solids (DS) Less than 000 ppm ppm ppm LSI Index +0. to to -.0 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. to -.0 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 //0

13 System Cleaning and Flushing Cleaning and Flushing Prior to start up of any heat pump, the water circulating system must be cleaned and flushed of all dirt and debris. If the system is equipped with water shutoff valves, the supply and return runouts must be connected together at each unit location (his will prevent the introduction of dirt into the unit, see Flushing with Water Shutoff Valve Equipped Systems illustration). he system should be filled at the water make-up connection with all air vents open. After filling, vents should be closed. Flushing with Water Shutoff Valve Equipped Systems Return Runout Supply Runout Rubber Hose Runouts Initially Connected ogether Mains he contractor should start the main circulator with the pressure reducing valve makeup open. Vents should be checked in sequence to bleed off any trapped air and to verify circulation through all components of the system. As water circulates through the system, the contractor should check and repair any leaks found in the piping system. Drain(s) at the lowest point(s) in the system should be opened for initial flush and blowdown, making sure water fill valves are set at the same rate. Check the pressure gauge at the pump suction and manually adjust the makeup water valve to hold the same positive pressure both before and after opening the drain valves. Flushing should continue for at least two hours, or longer if required, until drain water is clean and clear. he supplemental heater and/or circulator pump, if used, should be shut off. All drains and vents should be opened to completely drain the system. Short-circuited supply and return runouts should now be connected to the unit supply and return connections. Refill the system with clean water. est the system water for acidity and treat as required to leave the water slightly alkaline (ph 7. to.). he specified percentage of antifreeze may also be added at this time. Use commercial grade antifreeze designed for HVAC systems only. Environol brand antifreeze is recommended. Once the system has been filled with clean water and antifreeze (if used), precautions should be taken to protect the system from dirty water conditions. Dirty water will result in system-wide degradation of performance, and solids may clog valves, strainers, flow regulators, etc. Additionally, the heat exchanger may become clogged which reduces compressor service life and can cause premature unit failure. In boiler/tower application, set the loop control panel set points to desired temperatures. Supply power to all motors and start the circulating pumps. After full flow has been established through all components including the heat rejector (regardless of season), air vented and loop temperatures stabilized, each of the units will be ready for check, test and start up and for air and water balancing. Ground Source Loop System Checkout Once piping is completed between the unit pumping system and ground loop, final purging and charging of the loop is needed. A high pressure pump is needed to achieve adequate flow velocity in the loop to purge air and dirt particles from the loop itself. Antifreeze solution is used in most areas to prevent freezing. Flush the system adequately to remove as much air as possible; then pressurize the loop to a static pressure of 0-0 PSI (summer) or 0-7 PSI (winter). his is normally adequate for good system operation. Loop static pressure may decrease soon after initial installation, due to pipe expansion and loop temperature change. Running the unit for at least 0 minutes after the system has been completely purged of air will allow for the break-in period. It may be necessary to adjust static loop pressure (by adding water) after the unit has run for the first time. Loop static pressure will also fluctuate with the seasons. Pressures will be higher in the winter months than during the cooling season. his fluctuation is normal and should be considered when charging the system initially. Ensure the pump provides adequate flow through the unit by checking pressure drop across the heat exchanger. Usually.-.0 GPM of flow per ton of cooling capacity is recommended in earth loop applications.

14 Electrical Data Model Rated Voltage Voltage Min/Max Compressor* MCC RLA LRA HACR circuit breaker in USA only. * - MCC, RLA, & LRA rating per compressor. Breaker and FLA sized for both compressors. otal Unit FLA Min Circ Amp Max Fuse/HACR 0-0/0/ 7/ /0/ / /0/ 7/ /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ 7/ /0/ / /0/ / /0/ 7/ /0/ / /9/09

15 Electrical Data cont. Figure : Control Box ransformer 0 or 0 Volt Switch (If applicable) Power Supply (Field line voltage connection) User Interface* (Mounted here only on units without enclosure package) FX0 Control Board Phase Guard FX0 Expansion Board Compressor Contactor (Lower) Compressor Contactor (Upper) Compressor Current Sensors Field Low Voltage Connections

16 A 9 7 NXW REVERSIBLE CHILLER INSALLAION MANUAL Wiring Schematics 0-0/0/ B CC-B Yellow (0) /White () CC-A Yellow PGM /White () /White () C VAC COM /White () 7 (C) 9 RS DO-9 (0) (RS) SS DO- (9) (SS) R VAC (R) Yellow () X DO-7 () (X) Comp B LC (LC ) Alarm Brown () LC Comp A Alarm (LC ) Brown () X Acc NOE (X) Blue () Y COMP Blue () 0 (Y) Y COMP (Y) Blue () (O/B) O/B REV VALVE NOE 7 Legend LP Low Pressure LS Leaving Source emp L-WC Load Water Coil emp PB Power Block PGM Phase Guard Monitor RV Reversing Valve SFS Source Flow Switch S-WC Source Water Coil emp B erminal Board CC Compressor Contactor CPM Compressor Protection Module CS Current Switch EL Entering Load emp ES Emergency Shutdown ES Entering Source emp HP High Pressure LFS Load Flow Switch LL Leaving Load emp 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 Orange (7) G NO USED (G) AIC NO USED (AIC) SC NO USED (SC) L NO USED (L) O NO USED (O) 9 Notes B - Place switch to 0V position to operate unit at 0V. - Disconnect for degree source side freeze detection setpoint. - Disconnect for degree load side freeze detection setpoint. - Acc output is cycled with the lead compressor. - 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 using a source side flow proving switch, hook up as shown. If no flow proving switch is being used on the source side, the input must be jumpered to R 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. - Reversing Valve will be energized for heating mode. 9 - Used for Emergency Shutdown in conjunction with a normally open relay 0 -M and M are located on the compressor protection modules (CPM and CPM) inside of the compressor junction Boxes. Only used on 0 and 0 models. -Only used on the 0 and 0 models. /7/09 9 Grn/Yell (9) 7 Grn/Yell () Earth Ground Earth Ground Compressor Compressor ( Circuit A ) ( Circuit B ) S Blue S Blue S Blue S Blue /White (0) () Red () Current Switch Red () Current Switch White ( ) CS White () CS ransformer Switch Red Unit Power Supply 0V 0-0/0/ NOE NOE Blue Phase Co mp resso r Compressor 0V Guard Pro tectio n Protection CC CC Monitor M o d u le # Module # S S (CPM ) (CPM ) G L L L (PGM) NOE S S PB PB L L L L L L Violet (90) ransformer V (9) Red (9) Yellow (9) White () /White (0) (7 ) /White ( ) Red () Red () White () Yellow (7) White () () ( ) Orange (A) Orange (A) Yellow () /White () Green/Yellow () Yellow () 0 (F0) 0 J VDC (0) 9 (F9) 9 D09 GROUND VAC Com VAC AI (F) - AI + LP-B 7 D0 NOE 7 7 (F7) - AI (F) AI 0 LP-A A A A (F) D07 (F) A A A A AI VDC AI LED VDC White/Red (0) White/Red () White/Blue ( ) White/Blue ( ) Yellow/Red () Yellow/Red () Yellow/Blue (7) Yellow/Blue () an / () an / () 0 White/Red (0) White/Red () White/Blue () White/Blue () Yellow/Red () Yellow/Red () Yellow/Blue (7) Yellow/Blue () an / () an / () S-WC Circuit A Blue (7B) Blue/Wht (7B) Yellow (9) L-WC Circuit A Blue/Wht (9B) Yellow () S-WC Circuit B Blue (7A) Blue (7A) (9 ) 7 Blue (9A) () L-WC Circuit B Orange/Wht (B) Yellow Orange (B) LL Orange/Wht (0B) RV Brown () (F) D0 NOE A A A A 7 Orange (A) (F) Orange (0) Orange (0A) RV Yellow Brown () A A A J (F) PWM 9 an /White () an /White () an /White () D0 PWM Com 0 EL Blue () 0 (F0) PWM 0 D0 an /White () an /White () 0 an /White () Blue (0) Not Used (F9) A J0 Johnson FX-0 VAC Com CS-A CS-B Circuit A Circuit B Brn/Blk () (7A) (7A) DI (F) White () LS /Org (7B) /Org (7B) DI White (7) Brn/Blk () D0 SFS DI0 Orange (0) (F7) Gray () Connect to R on B DI9 NOE Orange (7) Brn/Wht (7) DI 7 Blue () ES White () (F) DI7 Blue () Brn/Wht () D0 HP-B (F) /Org (7B) CPM NOE 0 M (9B) M /Org (70 B) J9 White (B) White (B) (A) (A) Violet (7) (F) DI //// Com 9 () DI 0 Blue (7A) DI DI HP-A D0 DI ES Vdc 0 AI EXP Vdc Com Vdc AI EXP Vdc Com Vdc AI EXP 7 Vdc Com Vdc 9 AI EXP 0 Vdc Com J 0 7 J Violet () (F) Red () NOE Gray () PB (F) Blue (7B) (7A) NOE 0 CPM M (7A) NOE M (70A) DI Brown (7) A A A Vac Vac Com DO Vac DO DO Vac DO White (7) (F) 9VDC NOE 9 Pink () DI Gray (9) LFS A A A A A J7 NOE J A A A A Blue () Main Board Connection Johnson FX0 Expansion Board Blue () Orange (7) White (7) D0 D0 D07 D0 White () Orange (0) 7 BLACK WIRE HARNESS

17 A 9 7 NXW REVERSIBLE CHILLER INSALLAION MANUAL Wiring Schematics cont. 0/0/ Grn/Yell (9) Grn/Yell () Earth Ground Earth Ground Compressor Compressor ( Circuit A ) ( Circuit B ) S Blue S Blue S Blue S Blue /White (0) () Red () Current Switch Red () Current Switch White ( ) CS White () CS Unit Power Supply Blue 0/0/ NOE 0 NOE 0 Phase Compressor Compressor Guard Protection Protection CC CC Monitor Module # Module # S S (CPM ) ( CPM ) G L L L (PGM) S S PB PB L L L L L L ransformer V 0 (F0) 0 J VDC (F9) 9 D09 RS DO-9 (0) (RS) SS DO- (9) (SS) R VAC LC Comp A Alarm X Acc NOE (X) Y COMP Blue () 0 (Y) Y COMP (O/B) O/B REV VALVE NOE 7 G NO USED AIC NO USED SC NO USED L NO USED O NO USED (O) GROUND VAC Com VAC AI Yellow (9) Yellow () /White () Green/Yellow () Yellow () (F) /White () 9 7 X DO-7 () (X) Comp B LC (LC ) Alarm Brown () B C VAC COM (C) (R) (LC ) (Y) (G) (AIC) (SC) (L) B Yellow () Brown () Blue () /7/09 (0) CC-B CC-A - AI + /White () /White () LP-B /White () 7 Red (9) Yellow (9) White () /White (0) (7 ) /White ( ) Red () Red () White () Yellow (7) White () () ( ) Orange (A) Orange (A) D0 NOE 7 7 (F7) - AI (F) Blue () Orange (7) AI 0 LP-A A A A (F) D07 (F) A A A A AI VDC AI LED VDC White/Red (0) White/Red () White/Blue ( ) White/Blue ( ) Yellow/Red () Yellow/Red () Yellow/Blue (7) Yellow/Blue () an / () an / () 0 White/Red (0) White/Red () White/Blue () White/Blue () Yellow/Red () Yellow/Red () Yellow/Blue (7) Yellow/Blue () an / () an / () S-WC Circuit A Yellow Legend LP Low Pressure LS Leaving Source emp L-WC Load Water Coil emp PB Power Block PGM Phase Guard Monitor RV Reversing Valve SFS Source Flow Switch S-WC Source Water Coil emp B erminal Board CC Compressor Contactor CPM Compressor Protection Module CS Current Switch EL Entering Load emp ES Emergency Shutdown ES Entering Source emp HP High Pressure LFS Load Flow Switch LL Leaving Load emp 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 Notes - Disconnect for degree source side freeze detection setpoint. - Disconnect for degree load side freeze detection setpoint. - Acc output is cycled with the lead compressor. - 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 using a source side flow proving switch, hook up as shown. If no flow proving switch is being used on the source side, the input must be jumpered to R for the unit to operate. - Jumpers must be set as shown for correct control operation. If a communication card is present, it must be removed to check the jumpers. 7 - Reversing Valve will be energized for heating mode. - Used for Emergency Shutdown in conjunction with a normally open relay 9 - M and M are located on the compressor protection modules (CPM and CPM) inside of the compressor junction Boxes. Only used on 0 and 0 models. Blue (7B) Blue/Wht (7B) (9) L-WC Circuit A Blue/Wht (9B) Yellow () S-WC Circuit B Blue (7A) Blue (7A) (9 ) 7 Blue (9A) () Yellow (0) L-WC Circuit B Orange/Wht (B) PGM Yellow 0 - Only used on the 0 and 0 models. Orange (B) LL Orange/Wht (0B) RV Brown () (F) D0 NOE 7 A A A A 7 Orange (A) (F) Orange (0) Orange (0A) RV Yellow Brown () A A A J (F) PWM 9 an /White () an /White () an /White () D0 PWM Com 0 EL Blue () Blue (0) Not Used 0 (F0) PWM 0 D0 an /White () 0 (F9) A VAC Com J0 an /White () CS-A CS-B Circuit A Circuit B an /White () Brn/Blk () (7A) /Org (7B) (7A) /Org (7B) Orange (0) DI (F) LS Johnson FX-0 DI Brn/Blk () D0 SFS DI0 (F7) DI9 Brn/Wht (7) DI 7 ES (F) DI7 White () White (7) Gray () Orange (7) Blue () Blue () Connect to R on B NOE Brn/Wht () D0 HP-B (F) /Org (7B) White () CPM NOE 9 M M (9B) Violet (7) /Org (70 B) J9 White (B) White (B) (A) (A) (F) DI //// Com 9 DI 0 DI DI HP-A D0 DI ES Vdc 0 AI EXP Vdc Com Vdc AI EXP Vdc Com Vdc AI EXP 7 Vdc Com Vdc 9 AI EXP 0 Vdc Com J 0 7 J (F) (F) (7A) Violet () NOE 9 CPM M M (7A) White (7) PB (70A) DI Vac Vac Com DO Vac DO DO Vac DO A A A (F) 9VDC DI () Blue (7A) Red () Gray () Blue (7B) Brown (7) Pink () Gray (9) NOE NOE NOE LFS A A A A A J7 NOE J A A A A Blue () Main Board Connection Johnson FX0 Expansion Board Blue () Orange (7) White (7) D0 D0 D07 D0 White () Orange (0) 7 BLACK WIRE HARNESS 7

18 A 9 7 NXW REVERSIBLE CHILLER INSALLAION MANUAL Wiring Schematics cont. 7/0/ CC-B /White () CC-A Yellow /White () B C VAC COM (C) RS DO-9 (0) (RS) /White () SS DO- (9) (SS) R VAC /White () (R) 7 Yellow () 9 X DO-7 () (X) Comp B LC (LC ) Alarm Brown () LC Comp A Alarm (LC ) Brown () X Acc NOE (X) Blue () Y COMP Blue () 0 (Y) Y COMP (Y) Blue () (O/B) O/B REV VALVE NOE 7 Orange (7) G NO USED B (G) AIC NO USED (AIC) SC NO USED (SC) L NO USED (L) O NO USED (O) Legend LP Low Pressure LS Leaving Source emp L-WC Load Water Coil emp PB Power Block PGM Phase Guard Monitor RV Reversing Valve SFS Source Flow Switch S-WC Source Water Coil emp B erminal Board CC Compressor Contactor CPM Compressor Protection Module CS Current Switch EL Entering Load emp ES Emergency Shutdown ES Entering Source emp HP High Pressure LFS Load Flow Switch LL Leaving Load emp 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 Notes - Disconnect for degree source side freeze detection setpoint. - Disconnect for degree load side freeze detection setpoint. - Acc output is cycled with the lead compressor. - 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 using a source side flow proving switch, hook up as shown. If no flow proving switch is being used on the source side, the input must be jumpered to R for the unit to operate. - Jumpers must be set as shown for correct control operation. If a communication card is present, it must be removed to check the jumpers. 7 - Reversing Valve will be energized for heating mode. - Used for Emergency Shutdown in conjunction with a normally open relay. 9 - M and M are located on the compressor protection modules (CPM and CPM) inside of the compressor junction Boxes. Only used on 0 and 0 models. 9 /7/09 Grn/Yell (9) 7 Grn/Yell () Earth Ground Earth Ground Compressor Compressor ( Circuit A ) ( Circuit B ) S Blue S Blue S Blue S Blue /White (0) () Red () Current Switch Red () Current Switch White ( ) CS White () CS Unit Power Supply Blue 7/0/ NOE 0 NOE 0 Phase Compressor Co mp resso r Guard Protection Pro tectio n CC CC Monitor Module # M o d u le # S S (CPM ) ( CPM ) G L L L (PGM) S S PB L L L PB L L L L L L ransformer V (9) Red (9) Yellow (9) White () /White (0) (7 ) /White ( ) Red () Red () White () Yellow (7) White () () ( ) Orange (A) Orange (A) Yellow () /White () Green/Yellow () Yellow () 0 (F0) 0 Yellow (0) J VDC PGM Y-OU Y Only used on the 0 and 0 models. (F9) 9 C D09 GROUND VAC Com VAC AI White/Red (0) White/Red (0) (0) White/Red () White /Red () S-WC Circuit A Blue (7B) Blue/Wht (7B) Yellow (9) (F) - AI + LP-B 7 White/Blue ( ) White/Blue ( ) White/Blue () D0 NOE White/Blue () L-WC Circuit A Blue/Wht (9B) Yellow () 7 (F7) - AI + Yellow/Red () 7 9 Yellow/Red () Yellow/Red () (F) AI 0 Yellow/Blue (7) Yellow/Red () S-WC Circuit B Blue (7A) Blue (7A) LP-A A A A Yellow/Blue () (9 ) 7 Yellow/Blue (7) Blue (9A) () (F) D07 (F) A A A A AI VDC AI LED VDC an / () Yellow/Blue () L-WC Circuit B an / () Orange/Wht (B) Yellow an / () Orange (B) LL 0 an / () Orange/Wht (0B) RV Brown () (F) D0 NOE 7 A A A A 7 Orange (A) (F) Orange (0) Orange (0A) RV Yellow Brown () A A A J (F) PWM 9 an /White () an /White () an /White () D0 PWM Com 0 EL Blue () 0 (F0) PWM 0 D0 an /White () an /White () 0 an /White () Blue (0) Not Used (F9) A J0 Johnson FX-0 VAC Com CS-A CS-B Circuit A Circuit B Brn/Blk () (7A) (7A) DI (F) White () LS /Org (7B) /Org (7B) DI White (7) Brn/Blk () D0 SFS DI0 Orange (0) (F7) Gray () Connect to R on B DI9 NOE Orange (7) Brn/Wht (7) DI 7 Blue () ES White () (F) DI7 Blue () Brn/Wht () D0 HP-B (F) /Org (7B) CPM NOE 9 M (9B) M /Org (70 B) J9 White (B) White (B) (A) (A) Violet (7) (F) DI //// Com 9 () DI 0 Blue (7A) DI DI HP-A D0 DI ES Vdc 0 AI EXP Vdc Com Vdc AI EXP Vdc Com Vdc AI EXP 7 Vdc Com Vdc 9 AI EXP 0 Vdc Com J 0 7 J Violet () (F) Red () NOE Gray () PB (F) Blue (7B) (7A) NOE 9 CPM M (7A) NOE M (70A) DI Brown (7) Vac Vac Com DO Vac DO DO Vac DO A A A White (7) (F) 9VDC NOE Pink () DI Gray (9) LFS A A A A A J7 NOE J A A A A Blue () Main Board Connection Johnson FX0 Expansion Board Blue () Orange (7) White (7) D0 D0 D07 D0 White () Orange (0) 7 BLACK WIRE HARNESS

19 Field Wiring and Control Setup Figure a & b - High Voltage Connections Unit Power Supply 0-0/0/, 0/0/, or 7/0/ Line Voltage High Voltage Connections Connect power wiring as shown in Figure a and b. B VAC V COM G L L L PB R C Red Red White White NOE 0 Figure 9 - Low Voltage Connections R C ypical -Stat VAC V COM 0 Volt Operation Blue For 0V operation, select 0V on transformer switch as NOE 0 shown in Figure b. Low Voltage Operation hermostat/controller (Aquastat) A two-stage VAC thermostat or liquid controller (field supplied) must be used to turn the reversible chiller on or off, and to switch it from cooling to heating if necessary. Multiple chillers in the same bank must be controlled from one thermostat/controller (must be isolation relays for multiple unit applications). Comp Comp Rev Valve Acc Y Y O/B Y Y B Comp Comp Rev Valve Low Voltage Connections Connect low voltage thermostat wiring as shown in Figure 9. Connections shown are for typical thermostat. Actual connections may vary with specific device used. Acc X X NOE: If a separate transformer is used to supply a Y, Y, or B signal to the unit controls, isolation relays must be used. Alarm Circuit Alarm Circuit Alarm L LC LC Accessory Item CAUION: Use only copper conductors for field installed wiring. erminals in the unit are not designed for other types of conductors. NOES: ) Acc Output is cycled with the lead compressor ) Acc Output is cycled with the lag compressor 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. Figure 0 - Wiring Schematic Connect to R on B PB NOE NOE ES LFS SFS NOE NOE NOE White () White (7) Gray () Orange (7) Blue () Blue () () Blue (7A) Red () Gray () Blue (7B) Brown (7) Pink () Gray (9) J0 7 J9 9 0 VAC Com DI DI DI0 DI9 DI DI7 DI //// Com DI DI DI DI DI 9VDC DI 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 no connections on Flow Switch pins J0- (entering). If flow proving switch is required, hook up as shown in Fig. 0 and Note. he unit will not operate with out a flow proving switch installed. Load Flow Switch (LFS) Unit is factory shipped with no connections on Flow Switch pins J9- (leaving). If flow proving switch is required, hook up as shown in Fig. 0 and Note. he unit will not operate with out a flow proving switch installed. AENION: Flow Switches must be installed before unit will operate! 9

20 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 or ACC: (ACC shown) On FX0 control using the left and right arrow keys, scroll to PASSWORD menu (password 7 ) 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 actuation 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 7 ) 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 00 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 7 ) 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. F 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 0 of the FX0 control using a similar procedure as shown in the above examples. hese would include thermostat enabling, and emergency shutdown. See page 0 for details. DDC Operation & Connection Consult AGFX0 Manual for application details. 0

21 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- and DI-) he freeze detection temperature sensing selection inputs allow the user to adjust the setpoints. he source sensors are wired to inputs AI- and AI- while the load sensors are wired to inputs AI- and AI-. he setpoints for both, the load and source, are factory set for 0 F. In order to change the setpoint to F on the source, remove the jumper wire from DI- (wire #). he load setpoint can be changed by removing the jumper wire from DI- (wire #). Accessory Output (DO-) 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 de-activated. he 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, 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. Reversible Chiller Advanced Freeze Detection System he reversible chiller 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. F, 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 ( F [antifreeze] or F [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 F 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 F of the freeze setpoint, the previously mentioned 0 second delay will begin to be proportionately reduced, ending at a second delay

22 Control Features cont. when the leaving water temperature is. F above the freeze setpoint. 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 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. F 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. F above the freeze detection setpoint, the lead compressor is halted. When the leaving water temperature rises to. F above the freeze detection setpoint, it will be allowed to resume operation. his limiting is allowed to repeat indefinitely with no lockout or indication on the display. If the leaving water temperature drops to the freeze detection setpoint, the lag compressor is halted. When the leaving water temperature rises to. F above the freeze detection setpoint, it will be allowed to resume operation. his limiting is allowed to repeat indefinitely with no lockout or indication on the display. Compressor Current Switch (AI- EXP and AI- 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 seconds for a fault to occur. After faults in 0 minutes the control will put the unit into an alarm state. Flow Proving Switch (DI- and DI-0) he load and source flow-proving switches are a field installed option. hese switches shall be normally open flow switches that will close when the water flow through the heat exchangers reach an acceptable level. he flowproving switches must be closed 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 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-) 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 begins to flash. he control will remain in test mode until power is cycled or after 0 minutes.

23 Sequence of Operation Power Fail Restart When the controller is first powered up, the outputs will be disabled for a random start delay time (See Section.). 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 () 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 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 On 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 Off 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.

24 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 Accessory DO Load Cooling Freeze Detection AI Compressor Alarm DO Load Cooling Freeze Detection AI Compressor Alarm DO Network Output DO7 Load Flow Proving Switch DI Network Output DO Emergency Shutdown DI Network Output D09 Stage Low Pressure DI Source Htg Freeze Detection Select - 0ºF DI Future PWM Load Htg Freeze Detection Select - 0ºF DI Future PWM Stage Low Pressure DI hermostat Y DI 7 hermostat Y DI 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 Unused DO 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.

25 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: Power - Shows that the FX processor is operational Figure 0- 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 - On shows Reversing valve in cool - On shows unit in est mode Directional Keys Escape Key Return Key MUI Menu Navigation for NXW Reversible Chiller Welcome Info emp Stat Outputs Settings Alarm ALM_History Password Maint Info WFI Dual Stage Reversible Chiller PRODCWWE-0 MM/DD/YY emp emperatures Enter Load 77. F Leave Load.0 F Enter Source 70.0 F Leave Source.0 F Source Frz 77. F Source Frz 0.0 F Load Frz 0.0 F Load Frz 0.0 F Src Frz Setpt 0.0 F LD Frz Setpt 0.0 F Stat Status Unit Status Auto Y Status OFF Y Status OFF B 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 BO BO9 EXPB0 EXPB0 EXPB07 EXPB0 ON OFF Comp OFF Normal Normal OFF OFF OFF OFF OFF OFF OFF Settings Settings Unit of Measure F