Nordic ATW Series Installation And Service Manual
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Nordic ATW Series Installation And Service Manual

Reversing central air to water heat pump
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Installation and Service Manual
ATW-Series
Reversing Central Air to Water Heat Pump
Two-Stage R410a
Model Sizes 25-75
Maritime Geothermal Ltd.
info@nordicghp.com
P.O. Box 2555, 170 Plantation Road
www.nordicghp.com
Petitcodiac, NB E4Z 6H4
001970MAN-04
(506) 756-8135
ISSUE 02: 7-Dec-2021
Page 1
001970MAN-04
ISSUE 02: 7-Dec-2021

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  • Page 1 Installation and Service Manual ATW-Series Reversing Central Air to Water Heat Pump Two-Stage R410a Model Sizes 25-75 Maritime Geothermal Ltd. info@nordicghp.com P.O. Box 2555, 170 Plantation Road www.nordicghp.com Petitcodiac, NB E4Z 6H4 001970MAN-04 (506) 756-8135 ISSUE 02: 7-Dec-2021 Page 1 001970MAN-04 ISSUE 02: 7-Dec-2021...
  • Page 2 SAFETY PRECAUTIONS WARNING: Ensure all access panels are in place and properly secured before applying power to the unit. Failure to do so may cause electrical shock. WARNING: Before performing service or maintenance on the heat pump system, ensure all power sources are DISCONNECTED.
  • Page 3 APPLICATION TABLE - INDOOR UNIT SIZE FUNCTION REFRIGERANT VOLTAGE COMPRESSOR INDOOR REVISIONS COIL ATW-25 H A C W ATW-45 H A C W ATW-55 H A C W ATW-65 H A C W ATW-75 H A C W This manual applies only to the models and revisions listed in this table. APPLICATION TABLE - OUTDOOR UNIT MODEL REFRIGERANT...

  • Page 4: Table Of Contents

    Wiring Diagram (208/230-1-60) ..........86 Domestic Hot Water (Desuperheater) Connections ....21 Electrical Box Layout (208/230-1-60) ........87 002239PDG - Typical Piping Connections - ATW Series ..22 Wiring Diagram (208-3-60) ........... 88 002366PDG - Recommended Buffer Tank Piping ....23 Electrical Box Layout (208-3-60) ...........

  • Page 5: Tables & Documents

    002069CDG - Typical Zone and Auxiliary Wiring with GEN2 Hardwired Option (Heating Only) ... 19 002070CDG - Typical Zone and Auxiliary Wiring with GEN2 Hardwired Option (Heating & Cooling) ... 20 002239PDG - Typical Piping Connections - ATW Series ..............22 002366PDG - Recommended Hydronic Buffer Tank Piping ..............23 002528PDG - Buffer Tank Piping - Multiple Units ..................

  • Page 6: Atw System Description

    The cabinets are powder coated galvanized sheet metal. * See Piping chapter for Control is overseen by the Nordic GEN2 programmable control an annotated copy of board, which has many advanced features like laptop connectiv- this diagram ity via the free PC App software, data logging &...

  • Page 7: One Or Two Buffer Tanks

    One or Two Buffer Tanks? This is an important design choice that needs to be made when planning an installation. These systems are described more fully in the following chapters. Single Buffer Tank Systems By far, this is how most systems are config- ured.

  • Page 8: Atw Sizing

    ATW Sizing Air Source Heat Pumps Auxiliary Heat Sizing Since it is harder to extract heat from colder outdoor air, The easiest way to provide backup heat for new installa- any air source heat pump will have its lowest heating capacity tions is by installing a buffer tank that has electric elements.

  • Page 9: Installation Basics

    • ZONE TRANSFORMER & CIRC CONTACTOR • ZONE VALVES (IF NOT INDIVIDUAL PUMPS) FROM MARITIME GEOTHERMAL • IN-FLOOR PIPING • ATW SERIES HEAT PUMP W/ACE OUTDOOR UNIT • OTHER AIR HANDLERS, DUCTING • SHIELDED 18-8 WIRE • ZONE THERMOSTATS • BUFFER TANK W/ELEMENTS 12/15/20 kW •...

  • Page 10: Outdoor Unit Placement

    Outdoor Unit Placement Outdoor Unit Mounting Height The ACE unit must be placed outdoors, with the fan point- The outdoor unit must remain clear of snow and ice at all ing away from the building. It should be mounted where mois- times.

  • Page 11: Average Max. Snow Depth Map - Canada

    Average Maximum Snow Depth - Canada (1979-1997) Source: Natural Resources Canada ISSUE 02: 7-Dec-2021 Page 11 001970MAN-04...

  • Page 12: Wiring

    Wiring Indoor Unit Power Supply Connections Indoor Loop Circulator Pump Wiring The indoor unit has provisions for connecting the indoor Power supply for the heat pump from the breaker panel is circulator pump (between the heat pump and buffer tank) so that supplied to the indoor unit.

  • Page 13: Bacnet Connections

    BACnet Connections Setpoint Control: Aux. Connections If using BACnet for external control of heating/cooling de- When using Setpoint Control, there are 3 methods for acti- mand and/or monitoring of status, use a shielded twisted pair to vating hydronic auxiliary heat. See diagram on a following the connector at the bottom left of control board.

  • Page 14: Outdoor Unit: Signal Connections

    Outdoor Unit: Signal Connections Aquastat Connections (Optional) The speed of the fan and the heating mode expansion Most installations will use the internal Setpoint Control valve (EEV) in the outdoor unit are controlled by the control routine to control buffer tank temperature, in which case no aq- board in the ATW indoor unit, and a temperature sensor is read.

  • Page 15: 002019Cdg - Typ. Atw Series Wiring

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  • Page 16: 002375Qss - Altsource Tanks: Getting Started

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  • Page 17: 002067Cdg - Typ. Heating Only Zone Wiring (Setpoint)

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  • Page 18: 002068Cdg - Typ. Htg/Cooling Zone Wiring (Setpoint)

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  • Page 19: 002069Cdg - Typ. Heating Only Zone Wiring (Signals)

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  • Page 20: 002070Cdg - Typ. Htg/Cooling Zone Wiring (Signals)

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  • Page 21: Piping

    Piping Domestic Hot Water Number of Tanks (Desuperheater) Connections All systems will require at least one buffer tank. If there is The connections for the DHW circuit are 1/2” brass one buffer tank, it will contain the heated or chilled water. The FPT fittings.

  • Page 22: 002239Pdg - Typical Piping Connections - Atw Series

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  • Page 23: 002366Pdg - Recommended Buffer Tank Piping

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  • Page 24: 002528Pdg - Buffer Tank Piping - Multiple Units

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  • Page 25: 002252Pdg - 2 Tank Piping With A Reversing Heat Pump

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  • Page 26: 002527Pdg - 2 Tank Piping W/Multiple Rev. Heat Pumps

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  • Page 27: 002367Pdg - Auxiliary Boiler Piping

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  • Page 28: 000530Pdg - Typical Zone Types

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  • Page 29: 001055Pdg - Connection To On-Demand Dhw Tank

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  • Page 30: 000970Pdg - Desup. Conn. To Dhw Pre-Heat Tank

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  • Page 31: 002384Pdg - Dhw Pre-Heat Tank - Multiple Units

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  • Page 32: Outdoor Unit Line Set

    Outdoor Unit Line Set Line Set Interconnect Tubing TABLE 14a - 3-way Service Valve Tooling Once both the indoor and outdoor units have been Line set Hex key to Charging Nominal Valve cap mounted, the line set may be run between them. The line set connection open/ port cap...

  • Page 33: Pipe Insulation

    Pipe Insulation Charging the System All line set piping between the indoor and outdoor units The indoor unit is pre-charged for line sets up to 20 ft long. should be insulated with 3/8” thick closed cell pipe insulation to Once the system has been vacuumed, if extra refrigerant is prevent condensation and dripping onto floors or walls during required due to the length of the line set, it may be added before the heating season.

  • Page 34: 001983Cdg - Typical Atw Line Set Connections

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  • Page 35: Operation

    Operation 1. BACnet Control 3. Setpoint Control If using BACnet Control, the heat pump will turn the 2 com- One of the features of the ATW’s GEN2 Control Board is pressor stages on and off and activate cooling mode when it is built in temperature control functionality called “Setpoint Con- told to by the building control system.

  • Page 36: Typical Temperature Setpoints

    Setpoint Control window looks like this for Method 1 (Indoor If using well-designed in-concrete-floor heating, the heat- Loop - ICR): ing setpoints may be able to be lowered. Lower heating set- points will translate directly into a higher COP (efficiency). Heat- ing setpoints should be set to the lowest values that still main- tain an acceptable temperature in the building on the coldest day of the year;...

  • Page 37: Outdoor Reset

    Outdoor Reset As mentioned earlier, lower heating setpoints will translate directly into a higher COP (efficiency). When Control Source HYD is set to Setpoints, an optional Outdoor Reset control algorithm is available for heating mode, which reduces the heating temperature setpoints at warmer outdoor temperatures as measured by the outdoor unit. To enable it, simply click on the Outdoor Reset button at the top of the Setpoint Control window.

  • Page 38: Setpoint Control Method 3 - External Hts/Cts, One Tank

    Setpoint Control window looks like this for Method 3 Setpoint Control Method 3 - External (HTS/CTS) (External HTS/CTS with One Tank): One Tank PC APP: Tools-->Configuration RED—heating BLUE—cooling LCD Interface: Configuration This is the required method for when a high temperature auxiliary boiler is connected in parallel with the heat pump, and connected via H1-H2 to run only when the heat pump is off.

  • Page 39: Setpoint Control Method 4 - External Hts/Cts, 2 Tanks

    Setpoint Control window looks like this for Method 4 Setpoint Control Method 4 - External (HTS/CTS) (External HTS/CTS with Two Tanks): Two Tanks PC APP: Tools-->Configuration LCD Interface: Configuration Like with Method 3, when this method is used no indoor circulator control for temperature sampling will occur.

  • Page 40: Pc Application (Pc App)

    PC Application (PC App) NOTE: Before using the PC Application, refer to Appendix B & C for installation instructions for the PC Application and USB driver for the COM port. Both must be installed in order to run the PC App and communicate with the control board. Connect a USB cable between the PC and the control board USB connector located at the bottom center of the board.
  • Page 41 View Menu: This menu handles all of the operational viewing screens. Clicking on the View submenus will open the page in the PC APP’s frame. The next few pages of the manual show screenshots of each of the pages along with some descriptions of what is on each page. The main control panel window will open, shown below.
  • Page 42 View-->Alarms, Limits and Faults The alarms page has four tabs: ALARMS - Current alarm status, alarm count, high and low refrigeration alarm cutout values, and short cycle timer. ALARMS LIST - List of alarms that have occurred since the PC APP has been operating (this will be lost when the PC is discon- nected from the control board.) LIMITS - Limits in effect which prevent compressor operation but that do not cause an alarm.
  • Page 43 View-->Alarms, Limits and Faults (ALARMS LIST Tab): This tab show a history of alarms that have occurred since the PC APP was connected to the control board. This list will be lost when the PC APP is disconnected. Each alarm that occurs while This button will erase the the PC APP is connected to alarm events in the Alarm List.
  • Page 44 View-->Alarms, Limits and Faults (FAULTS tab): This tab shows hardware faults that could occur. If one of these faults occurs there may be a problem with the control board hard- ware, with LCD Display and buttons, or with a sensor. If a fault occurs, some things to try: ...
  • Page 45 View-->Water Lines Shows the water line temperatures. View-->Digital Inputs Shows the digital inputs and their individual status (ON/OFF). They may be individually controlled when in Manual Override Mode in order to facilitate troubleshooting. View-->Digital Outputs Shows the digital outputs and their individ- ual status (ON/OFF).
  • Page 46 Graphs Menu: This menu is a list of the available graphs. Graphs are real-time and show a time stamp of when the recording started as well as a current time which will show up if the graph is screen captured. Each graph has a CLEAR button which will erase the stored data and restart the graph.
  • Page 47 Tools Menu: This is where various tools for system setup and monitoring are located. Tools-->Configuration (System Configuration tab): This is where the system setup is done. Settings should only be changed by a person who has a good understanding of system oper- ation.
  • Page 48 Tools-->Configuration (Alarms and Delays tab): Click on the UP/DOWN arrows to change the value, noting that values have both a low and high limit. The number of minutes before the The minimum off time when unit can start again after various switching between heating and Count Reduce Time is alarm shutdowns...
  • Page 49 Tools-->Calibration: Generally there is no need for calibration. The suction and discharge pressures may be calibrated in increments of 1 psi if there is a discrepancy in the readings when compared to a known good reference. Temperature sensors may be adjusted in increments of 0.1°F. There is an AUTO CALIBRATION routine in the program that continu- ally calibrates the temperatures sensors against an on board reference resistor by applying an offset to the temperature sensors.
  • Page 50 Tools-->Datalogging (Datalog tab): The datalog rate is set via the dropdown box at the top right of the PC App main window. Starting with firmware version 2.85, a log will be recorded at the datalog rate whenever the heat pump is powered on, making it easy to compare datalogs from multiple units . The maximum number of datalog records is 32,224, which will take 45 days to fill up at the default recording rate of 2 minutes.
  • Page 51 Tools-->Parameters: WARNING! The Parameters page is for advanced use only. Changing parameter values can cause the system to stop functioning properly. The parameters page shows all configurable memory spaces with their name and current value and allows them to be edited directly. To change a parameter value type in the new value and press ENTER.

  • Page 52: Lcd Interface & Menus

    LCD Interface & Menus These are examples of the unit status and operating data displayed when at the message display level (top level). Pressing ENTER will enter into the menu levels beginning with the Main Menu. 2x16 LCD Display ENTER button: DOWN button: OK/EXIT button: UP button:...
  • Page 53 Menu Tree Continued ENTER ENTER ENTER ENTER Description (From Main) (First Press) (Second Press) (Third Press) Enable summer setback. Summer Setback — Enable Setback? — Enable (only if using Disable summer setback. — Disable Setpoint Control) Disable compressor, auxiliary and ICR. System EN/DIS —...

  • Page 54: Bacnet Interface

    BACnet Interface The BACnet interface is an MS/TP connection via RS-485 twisted pair. BACnet IP is not available. Recommended wire: 22-24 AWG single twisted pair, 100-120 Ohms impedance, 17pF/ft or lower capacitance, with braided or alumi- num foil shield, such as Belden 9841 or 89841. The connector on the control board is a three wire removable screw connector.

  • Page 55: Table 22 - Bacnet Objects - Data (Read Only)

    TABLE 22 - BACnet OBJECTS - DATA (Read Only) Name Property Units Description AI0 (Comp1_Current) Present Value Amps Compressor current draw (AI0) - requires accessory AI1 (Comp2_Current) Present Value User User defined (0-5VDC or 4-20mA) Present Value User User defined (0-5VDC or 4-20mA) Present Value User User defined (0-5VDC or 4-20mA)

  • Page 56: Table 23 - Bacnet Objects - Defrost Mode Description (Read Only)

    TABLE 23 - BACnet OBJECTS - DEFROST MODE Description (Read Only) Present Name Data Type Description Value Defrost Mode Analog Value AV11 Off (normal heating operation) Waiting to re-check low pressure Entering Defrost Mode Waiting for EEV’s Waiting for pressures to equalize Defrosting Completing Defrost Mode Exiting Defrost Mode...

  • Page 57: Table 25 - Bacnet Objects - Fault Descriptions (Read Only)

    TABLE 25 - BACnet OBJECTS - FAULT Descriptions (Read Only) Name Data Type Description AI4 (Cold Tank) Analog Input Cold tank temperature sensor faulty or disconnected - requires accessory AI5 (Hot Tank) Analog Input Hot tank temperature sensor faulty or disconnected - requires accessory LPS1 Analog Input Low pressure sensor faulty or disconnected...

  • Page 58: Startup Procedure

    Startup Procedure The ATW-Series Two-Stage R410a Startup Record located in this manual is used in conjunction with this startup procedure to provide a detailed record of the installation. A completed copy should be left on site, a copy kept on file by the installer, and a copy should be sent to Maritime Geothermal Ltd.

  • Page 59: Unit Startup

    Unit Startup The unit is now ready to be started. The steps below outline the procedure for starting the unit and verifying proper operation of the unit. It is recommended that safety glasses be worn during the following procedures. IMPORTANT NOTE: The unit is shipped with the compressor DISABLED in order to prevent the unit from starting when the power is first turned on.

  • Page 60: Startup Record

    Startup Record - ATW-Series Two-Stage R410a Installation Site Startup Date Installer City Company Province Model Check boxes unless asked to record data. Country Serial # Circle data units. Homeowner Name Homeowner Phone # PRE-START INSPECTION Outdoor Unit Unit is securely mounted at least 8” from building, fans facing out Fan outlet is clear of obstructions Line Set Line set length, extra charge added (only if needed)

  • Page 61: Routine Maintenance

    Routine Maintenance MAINTENANCE SCHEDULE Item Interval Procedure Outdoor Unit Weekly Inspect for and clear away debris or leaves in air coil intake, and ice buildup under unit that is approaching air coil. Compressor 1 year Inspect for pitted or burned points. Contactor Replace if necessary.

  • Page 62: Troubleshooting Guide

    Troubleshooting Guide WARNING: WHEN SERVICING THE OUTDOOR UNIT, BE SURE TO TURN OFF POWER TO THE INDOOR UNIT. The outdoor disconnect switch will not cut low voltage power, and damage to the control board will occur if the main heat pump breaker is not turned off during service. The following steps are for troubleshooting the heat pump.
  • Page 63 ALARM TROUBLESHOOTING Alarm/Fault Description Recommended Action The data logging function of the GEN2 Control Board is a very useful tool for troubleshooting alarms. It provides a histo- ry of the unit operation up to and including the time at which the alarm(s) occurred. Note that some alarms require ac- cessory components.
  • Page 64 FAULT TROUBLESHOOTING Alarm/Fault Description Recommended Action Digital Inputs Digital Outputs Analog Inputs Cycle the power a few times; if the A failure has occurred and the indicated section of the fault persists replace the control control board may no longer work properly. MODBUS Comms board.
  • Page 65 COMPRESSOR TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Compressor will Faulty control board. No 24vac output on STAGE1 when Replace control board. not start compressor should be operating. Faulty run capacitor. Check value with capacitance meter. Replace if faulty. (Single phase only) Should match label on capacitor.
  • Page 66 OPERATION TROUBLESHOOTING - HEATING MODE Possible Cause Verification Recommended Action Fault Outdoor temper- Outdoor EEV is mechani- Verify EEV operation (EEV2) - see Replace outdoor EEV if faulty. ature reading is cally faulty and causing EEV Troubleshooting section incorrect by a electromagnetic interfer- large amount ence...
  • Page 67 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High suction Outdoor unit’s EEV stuck Manually adjusting the outdoor EEV Go to EEV troubleshooting sec- pressure open does not affect the superheat or the tion. (may appear to suction pressure.
  • Page 68 OPERATION TROUBLESHOOTING - DEFROST & COOLING MODES Fault Possible Cause Verification Recommended Action High suction Indoor unit’s EEV stuck Manually adjusting the indoor EEV Go to EEV troubleshooting section. pressure open does not affect the superheat or the (may appear to suction pressure.
  • Page 69 OPERATION TROUBLESHOOTING - DEFROST & COOLING MODES Fault Possible Cause Verification Recommended Action Outdoor temper- Outdoor EEV is mechani- Verify outdoor EEV operation Replace outdoor EEV if faulty. ature reading is cally faulty and causing (EEV2) - see EEV Troubleshooting incorrect by a electromagnetic interfer- section...
  • Page 70 EEV TROUBLESHOOTING If there is a refrigeration problem such as low charge, plugged filter-dryer, EEV stuck, or any other kind of restriction in the refrigeration system, the apparent EEV position will work its way towards 100% (full open). High superheat is also a symptom.
  • Page 71 DOMESTIC HOT WATER (DESUPERHEATER) TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Insufficient hot Thermostat on final hot Visually inspect the setting. Adjust the setting. water (tank water tank set too low. problem) Should be set at 120°F to 140°F Breaker tripped, or fuse Check both line and load sides of Correct problem, and replace blown in electrical supply...

  • Page 72: Repair Procedures

    Repair Procedures WARNING: WHEN SERVICING THE OUTDOOR UNIT, BE SURE TO TURN OFF POWER TO THE INDOOR UNIT. The outdoor disconnect switch will not cut low voltage power, and damage to the control board will occur if the main heat pump breaker is not turned off during service. Pumpdown Procedure 1.

  • Page 73: Compressor Replacement Procedure

    Compressor Replacement Procedure 1. Pump down the unit as per the Pumpdown Procedure above. If there was a compressor burn out (motor failure), the refrigerant cannot be reused and must be disposed of according to local codes. 2. Disconnect piping. 3.

  • Page 74: Control Board Replacement Procedure

    Control Board Replacement Procedure 1. Turn the power off to the unit. 2. Take a picture of the control board and connectors for reference. The picture in Appendix A may also be helpful. 3. Carefully remove all green terminal strips on the left side, the right side and the bottom of the control board. They pull straight off the board, with no need to disconnect wires from their screw terminals.

  • Page 75: Lcd Interface (Display) Board Replacement Procedure

    LCD Interface (Display) Board Replacement Procedure 1. Turn the power off to the unit. 2. Remove the display board cable connector from the control board. 3. Using a sharp utility knife with a long blade, slice each of the display board standoff heads off, taking care to not damage the lexan cover.

  • Page 76: Model Specific Information

    Model Specific Information Table 26 - Shipping Information - Indoor Unit Table 27 - Shipping Information - Outdoor Unit WEIGHT DIMENSIONS in (cm) WEIGHT DIMENSIONS in (cm) MODEL MODEL lb. (kg) lb. (kg) ATW-25 270 (122) 34 (86) 34 (86) 35 (89) ATW-25 230 (104)

  • Page 77: Pressure Drop Data

    Pressure Drop Data Table 33: Loop Pressure 15% Methanol 35% prop. glycol Water 104°F Water 50°F Drop Data 32°F 32°F 0.25 0.32 0.38 0.44 0.50 ATW- 0.57 0.63 0.69 0.76 0.82 10.1 0.25 0.32 0.38 0.44 0.50 0.57 ATW- 0.63 0.69 0.76 0.82...
  • Page 78 Table 33: Loop Pressure 15% Methanol 35% prop. glycol Water 104°F Water 50°F (cont’d) Drop Data 32°F 32°F 0.38 0.44 0.50 0.57 0.63 ATW- 0.69 0.76 0.82 0.88 0.95 1.01 0.38 0.44 0.50 0.57 0.63 0.69 ATW- 0.76 0.82 0.88 0.95 1.01 1.07...

  • Page 79: Standard Capacity Ratings

    Standard Capacity Ratings The tables show the heat pump performance at the standard rating conditions specified in AHRI standard 550/590 with Adden- dum 1, September 2017. There is currently no AHRI certification program for air to water heat pumps in heating mode; there- fore, the blue AHRI CERTIFIED mark is not applicable to any manufacturer’s air to water heat pumps in heating duty.

  • Page 80: Performance Tables

    Performance Tables ATW-25-HACW-P-1T R410a, 60 Hz, ZPS20K5E-PFV OUTDOOR ELECTRICAL INDOOR Outdoor Air Evaporating Heat Absorbed Compressor Input Condensing Liquid Flow Heating Delta T Temperature Temperature (Btu/hr) Current (A) Power (W) Temperature (gpm) (Btu/hr) -5°F -16°F 3,330 2410 102°F 111°F 3°F 11,400 1.38 5°F...
  • Page 81 Performance Tables ATW-45-HACW-P-1T R410a, 60 Hz, ZPS30K5E-PFV OUTDOOR ELECTRICAL INDOOR Outdoor Air Evaporating Heat Absorbed Compressor Input Condensing Liquid Flow Heating Delta T Temperature Temperature (Btu/hr) Current (A) Power (W) Temperature (gpm) (Btu/hr) -5°F -16°F 5,530 13.5 3290 102°F 110°F 3°F 16,600 1.48...
  • Page 82 Performance Tables ATW-55-HACW-P-1T R410a, 60 Hz, ZPS40K5E-PFV OUTDOOR ELECTRICAL INDOOR Outdoor Air Evaporating Heat Absorbed Compressor Input Condensing Liquid Flow Heating Delta T Temperature Temperature (Btu/hr) Current (A) Power (W) Temperature (gpm) (Btu/hr) -5°F -16°F 6,810 16.7 3870 102°F 110°F 3°F 19,800 1.50...
  • Page 83 Performance Tables ATW-65-HACW-P-1T R410a, 60 Hz, ZPS51K5E-PFV OUTDOOR ELECTRICAL INDOOR Outdoor Air Evaporating Heat Absorbed Compressor Input Condensing Liquid Flow Heating Delta T Temperature Temperature (Btu/hr) Current (A) Power (W) Temperature (gpm) (Btu/hr) -5°F -16°F 7,600 20.7 4730 102°F 110°F 3°F 23,400 1.45...
  • Page 84 Performance Tables ATW-75-HACW-P-1T R410a, 60 Hz, ZPS60K5E-PFV OUTDOOR ELECTRICAL INDOOR Outdoor Air Evaporating Heat Absorbed Compressor Input Condensing Liquid Flow Heating Delta T Temperature Temperature (Btu/hr) Current (A) Power (W) Temperature (gpm) (Btu/hr) -5°F -16°F 7,910 23.1 5140 102°F 110°F 3°F 25,100 1.43...

  • Page 85: Electrical Specifications

    Electrical Specifications TABLE 36 - ATW-Series Electrical Specifications Indoor Outdoor Max. Min. Power Supply Compressor Circulators Unit Breaker Wire Code V-ø-Hz Max A Max A Amps Amps Amps 230-1-60 11.7 17.1 20.0 #10-2* 208-3-60 11.9 13.5 #12-3* ATW- 460-3-60 #14-4 220-1-50 14.6 16.9...

  • Page 86: Wiring Diagram (208/230-1-60)

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  • Page 87: Electrical Box Layout (208/230-1-60)

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  • Page 88: Wiring Diagram (208-3-60)

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  • Page 89: Electrical Box Layout (208-3-60)

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  • Page 90: Wiring Diagram (460-3-60)

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  • Page 91: Electrical Box Layout (460-3-60)

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  • Page 92: Ace-45/55 Wiring Diagram

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  • Page 93: Atw-Series Refrigeration Circuit - Heating Mode

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  • Page 94: Atw-Series Refrigeration Circuit - Cooling/Defrost Mode

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  • Page 95: Dimensions: Atw-25/45

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  • Page 96 Dimensions: ATW-25/45 All dimensions in inches ISSUE 02: 7-Dec-2021 Page 96 001970MAN-04...

  • Page 97: Dimensions: Atw-55

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  • Page 98 Dimensions: ATW-55 All dimensions in inches ISSUE 02: 7-Dec-2021 Page 98 001970MAN-04...

  • Page 99: Dimensions: Atw-65/75

    Dimensions: ATW-65/75 All dimensions in inches ISSUE 02: 7-Dec-2021 Page 99 001970MAN-04...
  • Page 100 Dimensions: ATW-65/75 All dimensions in inches ISSUE 02: 7-Dec-2021 Page 100 001970MAN-04...

  • Page 101: Appendix A: Control Board Description

    Appendix A: Gen2 Control Board Description The picture below shows the locations of the connectors and LED indicators of the control board. The control board offers many fea- tures such as short circuit protection on all digital outputs, Real Time Clock with super capacitor for backup power, WiFi capability, relay outputs for plenum heater control (if equipped), USB port, PIC32 microcontroller, etc.

  • Page 102: Table A1 - Control Board Connector Descriptions (Top)

    The tables describe the connections starting with the top of the board and working around the board counter clock-wise. TABLE A1 - Control Board Connector Descriptions (Top) Name Description HPS1/HI1 High Pressure Sensor 1 Mounted in indoor unit, measures discharge pressure. LPS1/LO1 Low Pressure Sensor 1 Mounted in indoor unit, measures suction pressure.

  • Page 103: Table A3 - Control Board Connector Descriptions (Bottom)

    TABLE A3 - Control Board Connector Descriptions (Bottom) Name Description BACnet MS/TP Ground for shield if required. BACnet MS/TP RS-485. BACnet MS/TP RS-485. STAGE1 Compressor Stage 1 Starts / stops the compressor. STAGE2 Compressor Stage 2 Turns the compressor Stage 2 solenoid on/off. RV_#1 Reversing Valve#1 Off in heating mode, on in cooling mode.

  • Page 104: Table A4 - Control Board Connector Descriptions (Right Side)

    TABLE A4 - Control Board Connector Descriptions (Right Side) Name Description DI_1 Digital Input1 Unused. DI_0 Digital Input0 Unused. Phase Monitor2 Switch or dry contact from R to activate Summer Setback mode. Phase Monitor1 Accessory for 3 phase models. Y2A* Aquastat Stage2 Optional stage 2 24VAC input for use with Signals/Hardwired control.

  • Page 105: Appendix B: Usb Driver Installation

    Appendix B - USB Driver Installation The first step in connecting a Windows laptop computer to the 4. In the window that is displayed, click and hold down the mouse button on the folder name, and drag to your desktop: control board is to install the USB driver.

  • Page 106: Appendix C: Pc App Installation

    Appendix C - PC App Installation The PC App allows detailed interfacing with the control board 4. In the window that is displayed, click and hold down the mouse button on the folder name, and drag to your desktop: using a Windows laptop computer. Any Windows from XP and onwards should be compatible, but Windows 10 (as found on any recent laptop computer) is recommended.

  • Page 107: Appendix D: Updating Firmware

    Appendix D: Updating Firmware METHOD 1: Updating Firmware Using PC App This method can be used when updating post-2017 control 7. Click on YES. The following message box will appear: boards with bootloader version 2.0. This method will not work for older control boards with bootloader version 1.0 (approx.
  • Page 108 12. Click on Load Hex File. Select the 16. Close the PIC32 program. MGL_GEN2_V360.production.hex (or higher version num- ber) file, which is in the folder you created on the Desktop. 17. WAIT APPROXIMATELY 10 SECONDS. This gives the control board time to reset, initialize and re-connect to the PC USB port.
  • Page 109 METHOD 2: Updating Firmware Using Jumper Pins This method should be used when updating older control boards 6. Turn the power back on. The control board is now in boot that have bootloader version 1.0, or where the PC App has trou- loader mode and is ready to be programmed.

  • Page 110: Warranty

    This warranty is subject to the following conditions: 1. The NORDIC® heat pump must be properly installed and maintained in accordance with MARITIME GEOTHERMAL LTD.'s installation and maintenance instructions.

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