Nordic WC Series Manual
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Nordic WC Series Manual

High temperature water-to-water heat pump
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Application, Installation, & Service Manual
WC-Series
High Temperature Water-to-Water Heat Pump
Cascade R410a / R134a
Model Sizes 16-80
Space Heating or Dedicated Domestic Hot Water Options
Maritime Geothermal Ltd.
info@nordicghp.com
P.O. Box 2555, 170 Plantation Road
www.nordicghp.com
Petitcodiac, NB E4Z 6H4
002138MAN-03
(506) 756-8135
ECO 000297: 11-Jan-2022
Page 1
002138MAN-03
ECO 000297: 11-Jan-2022

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Summary of Contents for Nordic WC Series

  • Page 1 Application, Installation, & Service Manual WC-Series High Temperature Water-to-Water Heat Pump Cascade R410a / R134a Model Sizes 16-80 Space Heating or Dedicated Domestic Hot Water Options Maritime Geothermal Ltd. info@nordicghp.com P.O. Box 2555, 170 Plantation Road www.nordicghp.com Petitcodiac, NB E4Z 6H4 002138MAN-03 (506) 756-8135 ECO 000297: 11-Jan-2022...
  • 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 OUTDOOR INDOOR MODEL FUNCTION REFRIGERANT VOLTAGE COMPRESOR REVISIONS COIL COIL WC-16 WC-25 WC-45 WC-55 WC-65 WC-75 WC-80 This manual applies only to the models and revisions listed in this table APPLICATION TABLE - FIRMWARE AND PC APP Firmware Version* Associated PC APP Version...

  • Page 4: Table Of Contents

    Unit Placement ............... 8 Setpoint Control Method 2 - External HTS/CTS ....40 Sample Bill of Materials - WC Series on Ground Loop .... 8 a) Heat Pump Mode ............40 Sample Bill of Materials - WC Series on Open Loop ....8 b) Chiller Mode ..............

  • Page 5: Tables & Documents

    002286PDG - Geothermal Snow Melt System with Warm-Weather Ground Loop Re-heating ....23 002576PDG - Typical Piping Connections - WC Series - Direct DHW Heating w/Double Wall Cond..24 002545PDG - DHW Tank Piping for Direct Domestic Water Heating............. 25 000608INF - Typical Horizontal Ground Loop Configuration ..............

  • Page 6: Wc-Series System Description

    WC-Series Description 1. Heating Mode Maritime Geothermal Ltd. has manufactured NORDIC brand W-series water-to-water geothermal/geoexchange heat In heating mode, the heat pump heats water in a buffer pumps in residential sizes (nominal 2 to 6 tons) for almost 40 tank (or DHW tank) to a user-adjustable setpoint temperature, years.

  • Page 7: Sizing For Space Heating/Cooling

    Sizing for Space Heating/Cooling WC-Series Heat Pump Sizing Auxiliary Heat Sizing Table 1 shows the above grade size of building that can The easiest way to provide auxiliary or backup heat for typically be heated/cooled in northern climates. new installations is by installing a buffer tank that has electric elements.

  • Page 8: Installation Basics

    Sample Bill of Materials - Sample Bill of Materials - WC Series on Ground Loop WC Series on Open Loop FROM MARITIME GEOTHERMAL FROM MARITIME GEOTHERMAL • WC SERIES HEAT PUMP •...

  • Page 9: Wiring

    Wiring Power Supply Connections per the voltage of the circulator pump module. Ground wire should be connected to the ground lug in the electrical box. Power supply for the heat pump from the breaker panel is Ensure that the total current draw does not exceed the value supplied to the unit via concentric 1.093”...

  • Page 10: Bacnet Connections

    Since there is no The CA, RA, & Y1A connections are located on the reversing valve in the WC series, there are no external control right side towards the top of the control board, as shown on the connections.

  • Page 11: 002241Cdg - Typ. Gen2 Aux. Heat & Circulator Wiring

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  • Page 12: 002375Qss - Altsource Tanks: Getting Started

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  • Page 13: 002067Cdg - Typ. Heating Only Zone Wiring (Setpoint)

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  • Page 14: 002069Cdg - Typ. Heating Only Zone Wiring (Signals)

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  • Page 15: Piping

    Piping WC-Series: Space Heating vs. DHW Outdoor Loop The indoor loop piping will be different depending on WC-series connections for the outdoor loop are 1” whether it’s a WC-series heat pump with single wall condenser brass female NPT. They are labelled OUTDOOR IN and being connected for space heating use, or a WC-series heat OUTDOOR OUT.

  • Page 16: 002575Pdg - Typ. Piping Connections - Space Heating

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  • Page 17: 002366Pdg - Recommended Buffer Tank Piping

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  • Page 18: 002528Pdg - Buffer Tank Piping - Multiple Units

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  • Page 19: 002367Pdg - Auxiliary Boiler Piping

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  • Page 20: 002288Pdg - Two Tank Simultaneous Heating/Cooling

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  • Page 21: 001680Pdg - Two Tank Simultaneous (Diverting)

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  • Page 22: 000530Pdg - Typical Zone Types

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  • Page 23: 002286Pdg - Snow Melt W/Ground Loop Re-Heating

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  • Page 24: 002576Pdg - Typ. Piping Connections - Dhw Heating

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  • Page 25: 002545Pdg - Dhw Tank Piping For Direct Dhw Heating

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  • Page 26: Ground Loop Installations

    Ground Loop Installations When satisfied that all connections are leak free, release the air pressure and connect a purge cart (see Figure 1) to the flushing access ports at the pump module (refer to drawing WARNING: Heating-only WC units only extract 000906CDG).

  • Page 27: Adding Antifreeze Solution

    Adjust the circulator pump module valves to connect the TABLE 10 - Volume of fluid per 100 ft. of pipe purge cart to the ground loop. Begin pumping water through the ground loop, ensuring that the intake of the pump stays Volume /100ft.

  • Page 28: 000608Inf - Typical Horiz. Ground Loop Configuration

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  • Page 29: 000609Inf - Typical Vert. Ground Loop Configuration

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  • Page 30: 000906Cdg - Circulator Pump Module Installation

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  • Page 31: 000629Pdg - Pump Module Inst - 2 Units On 1 Loop

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  • Page 32: Open Loop Installations

    Open Loop Installations Well Water Temperature It is best to flow the well for as long as possible (e.g. 12 hours) at the flow rate required by the proposed heat pump size. The temperature of the well water should be a minimum of However, if the test is performed before a larger submersible 39°F (4°C).

  • Page 33: Water Valve

    ENSURE SELECTED METHOD CONFORMS Figure 3: Open Loop Accessories & Tools TO LOCAL REGULATIONS. A return well should be a minimum of 80 ft. from the supply Cumulative Water well for residential applications. The water returned to the well Gallon Level will not necessarily be pumped into the same aquifer, depend- Meter...

  • Page 34: Water Flow Control

    Water Flow Control Plumbing the Heat Pump A flow restricting (‘Dole’) valve is highly recommended, The port connections for the Outdoor Loop are 1” brass installed downstream of the water valve. This is a passive (non- FPT fittings. They are marked OUTDOOR IN and OUT. electrical) device which automatically varies the size of its rub- ber orifice in order to restrict flow to its stamped gpm value, re- Plumbing lines, both IN (supply) and OUT (discharge), must...

  • Page 35: 000907Cdg - Typical Open Loop Installation

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  • Page 36: 000619Inf - Ground Water Disposal Methods

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  • Page 37: Operation

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

  • Page 38: Typical Temperature Setpoints

    Setpoint Control window looks like this for Method 1 (Indoor TABLE 12 - WC-series Typical Space Heating Loop - ICR): Temperature Setpoints Stage 1 Stage 2 (Aux) SPACE HEATING °F °F °C °C Setpoint Delta Activation * Delay 10 minutes *Activation is determined by the Setpoint and Delta values Space heating setpoints can vary widely depending on the application, but the selection of a WC-series heat pump (with its...

  • Page 39: Outdoor Reset

    Outdoor Reset Then enable the outdoor sensor in the Tools --> Configu- ration window or LCD interface: Lower heating setpoints will translate directly into a higher COP (efficiency). On warm winter days, a lower hydronic water temperature will often still allow the high temperature heating PC APP: distribution system to maintain the space at a comfortable tem- Tools-->Configuration...

  • Page 40: Setpoint Control Method 2 - External Hts/Cts

    Setpoint Control Method 2 - External (HTS/CTS) Setpoint Control window looks like this for Method 2a a) HTS/CTS - Heat Pump Mode (External HTS/CTS, Heat Pump Mode): Most of the time, water heating/cooling heat pumps turn on and off in response to the temperature of the indoor loop (indoor buffer tank).

  • Page 41: B) Chiller Mode

    Setpoint Control window looks like this for Method 2b b) HTS/CTS - Chiller Mode (External HTS/CTS, Chiller Mode): Chiller Mode allows the heat pump to be controlled from the Outdoor Loop (cold side) rather than the Indoor Loop (hot side) for applications that require controlled cooling with hot water heat rejection.

  • Page 42: Pc Application (Pc App)

    PC Application (PC App) NOTE: Before using the PC Application, refer to Appendices 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 43 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 44 View-->Alarms, Limits and Faults (ALARMS Tab): NOTE: Greyed out Alarms in the PC APP are not applicable to the system setup and are not monitored by the control board. NOTE: Refer to Alarms and Faults screenshot below to see which alarms have a count. Alarms without a count: These alarms only occur one time at which point they immediately create a Permanent Alarm.
  • Page 45 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 46 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 47 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 48 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 49 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 50 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 unit can start again after various Count Reduce Time is alarm shutdowns the number of hours after which the alarm...
  • Page 51 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 52 Tools-->Datalogging (Datalog tab): The datalog rate is set via the dropdown box at the top right of the PC App main window. 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 53 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 54: 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 ENTER button: DOWN button: OK/EXIT button: UP button:...
  • Page 55 Main Menu Tree Continued ENTER ENTER ENTER ENTER Description (From Main) (First Press) (Second Press) (Third Press) On-board water temp. control—see Configuration — Control HYD — Setpoints Setpoint Control section Hardwired Signal control — Signals BACnet control—see BACnet section — BACnet —...

  • Page 56: 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 57: Table 18 - Bacnet Objects - Data (Read Only)

    TABLE 18 - BACnet OBJECTS - DATA (Read Only) Name Property Units Description AI0 (Comp1_Current) Present Value Amps R410a compressor current draw (AI0) - requires accessory AI1 (Comp2_Current) Present Value User R134a compressor current draw (AI1) - requires accessory Present Value User User defined (0-5VDC or 4-20mA) Present Value...

  • Page 58: Table 19 - Bacnet Objects - Alarm Descriptions (Read Only)

    TABLE 19 - BACnet OBJECTS - ALARM Descriptions (Read Only) Name Data Type Description AI0 (Comp1 Current) Analog Input R410a status alarm (start / stop failure, from accessory current sensor) AI1 (Comp2 Current) Analog Input R134a status alarm (start / stop failure, from accessory current sensor) LPS1 Analog Input R410a low pressure alarm...

  • Page 59: Table 20 - Bacnet Objects - Fault Descriptions (Read Only)

    TABLE 20 - BACnet OBJECTS - FAULT Descriptions (Read Only) Name Data Type Description AI4 (Cold Tank) Analog Input AI5 (Hot Tank) Analog Input Hot tank temperature sensor faulty or disconnected - requires accessory LPS1 Analog Input R410a low pressure sensor faulty or disconnected HPS1 Analog Input R410a high pressure sensor faulty or disconnected...

  • Page 60: Startup Procedure

    Startup Procedure The WC-Series 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 61 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 SYSTEM DISABLED in order to prevent the unit from starting when the power is first turned on.

  • Page 62: Startup Record

    Startup Record - WC-Series Startup Date Installation Site Installer City Company Province Check boxes unless Model asked to record data. Country Serial # Circle data units. Customer Name Customer Phone # PRE-START INSPECTION Indoor Loop All shut-off valve are open (full flow available) (Hydronic) Loop is full and purged of air Antifreeze type, if any...

  • Page 63: Routine Maintenance

    Routine Maintenance MAINTENANCE SCHEDULE Item Interval Procedure Compressor 1 year Inspect for pitted or burned points. Contactor Replace if necessary. LCD Interface or When heat pump Check for alarms and faults (only necessary if alarms PC App problem is suspected not reported through a BACnet system).

  • Page 64: Troubleshooting Guide

    Troubleshooting Guide The following steps are for troubleshooting the heat pump. Repair procedures and reference refrigeration circuit diagrams can be found later in this manual. STEP 1: Verify that the LCD screen is functioning . If it is not, proceed to POWER SUPPLY TROUBLE SHOOTING, otherwise pro- ceed to STEP 2.
  • Page 65 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 66 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 67 COMPRESSOR TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Compressor will Faulty control board. No 24vac output on STAGE1 or Replace control board. not start STAGE2 when corresponding com- pressor should be operating. Faulty run capacitor. Check value with capacitance meter. Replace if faulty.
  • Page 68 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High or low suc- Faulty sensor Compare pressure sensor reading Check wiring, replace sensor. If tion or discharge against a known reference such as a problem persists, replace control pressure new refrigeration manifold set.
  • Page 69 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action Low suction EEV stuck almost closed Manually adjusting the EEV does Go to EEV troubleshooting sec- pressure or partially blocked by for- not affect the superheat or the suc- tion.
  • 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: Repair Procedures

    Repair Procedures Pumpdown Procedure 1. Place the unit in SERVICE mode via the PC App or LCD interface; this will open the EEVs and start the indoor circu- lator (as long that circulator is powered and controlled by the heat pump). DO NOT turn off electrical power at the breaker panel, since the heat exchangers must have full water flow during refrigerant recovery.

  • Page 72: 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 73: 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 74: 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 75: Model Specific Information: W-Series

    Model Specific Information Table 21 - Refrigerant Charge Table 22 - Shipping Information WEIGHT DIMENSIONS in (cm) R410a R134a MODEL MODEL lb. (kg) WC-16 WC-16 345 (157) 46 (117) 36 (91) 35 (89) WC-25 380 (173) 46 (117) 36 (91) 35 (89) WC-25 WC-45...

  • Page 76: W-Series Pressure Drop Data

    Table 25: WC Pressure INDOOR OUTDOOR OUTDOOR OUTDOOR Drop Data (water 140°F) (water 50°F) (15% methanol 32°F) (35% prop. glycol 32°F) 0.25 0.32 WC-16 0.38 0.44 0.50 0.25 0.32 0.38 0.44 WC-25 0.50 0.57 0.63 0.69 0.38 0.44 0.50 0.57 WC-45 0.63 0.69...
  • Page 77 Table 25: WC Pressure INDOOR OUTDOOR OUTDOOR OUTDOOR (cont’d) Drop Data (water 140°F) (water 50°F) (15% methanol 32°F) (35% prop. glycol 32° F) 0.50 0.57 0.63 0.69 WC-65 0.76 0.82 0.88 0.95 1.01 0.50 0.57 0.63 0.69 0.76 WC-75 0.82 0.88 0.95 1.01...

  • Page 78: Performance Tables: Wc-16

    Performance Tables WC-16-H-C-*D-** 60 Hz, ZP14K5E-PFV / ZR16K5E-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 8,600...

  • Page 79: Performance Tables: Wc-25

    Performance Tables WC-25-H-C-*D-** 60 Hz, ZP16K6E-PFV / ZR21K5E-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 10,600...

  • Page 80: Performance Tables: Wc-45

    Performance Tables WC-45-H-C-*D-** 60 Hz, ZP25K6E-PFV / ZR32K5E-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 16,500...

  • Page 81: Performance Tables: Wc-55

    Performance Tables WC-55-H-C-*D-** 60 Hz, ZP36K5E-PFV / ZR42K5E-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 22,600...

  • Page 82: Performance Tables: Wc-65

    Performance Tables WC-65-H-C-*D-** 60 Hz, ZP42K5E-PFV / ZR54K5E-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 27,800...

  • Page 83: Performance Tables: Wc-75

    Performance Tables WC-75-H-C-*D-** 60 Hz, ZP54K5E-PFV / ZR61KCE-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 33,200...

  • Page 84: Performance Tables: Wc-80

    Performance Tables WC-80-H-C-*D-** 60 Hz, ZP61K5E-PFV / ZR68KCE-PFV OUTDOOR LOOP (35% Propylene Glycol) ELECTRICAL INDOOR LOOP (Water) Evap. Flow Delta T Heat Abs. Input Power Cond. Flow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) (°F) Temp. (gpm) (°F) (°F) (Btu/hr) 37,100...

  • Page 85: Electrical Specifications

    Electrical Specifications TABLE 26 - WC-Series Electrical Specifications Compressor Compressor Max. Min. Power Supply Circulators (R410a) (R134a) Breaker Wire Model Code V-ø-Hz Max A Amps Amps Amps WC-16 208/230-1-60 17.5 24.8 #10-2* 208/230-1-60 10.8 20.0 27.7 #8-2* WC-25 220-1-50 16.6 23.9 #10-2 208/230-1-60...

  • Page 86: Dimensions

    Dimensions All dimensions in inches. LEFT SIDE: FRONT: RIGHT SIDE: > 24” service access > 24” service access > 24” service access clearance required clearance required clearance required BACK: no clearance required ECO 000297: 11-Jan-2022 Page 86 002138MAN-03...

  • Page 87: Wiring & Electrical Box Diagrams (208/230-1-60)

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  • Page 88 Electrical Box Layout (208/230-1-60) ECO 000297: 11-Jan-2022 Page 88 002138MAN-03...

  • Page 89: Wiring & Electrical Box Diagrams (208-3-60)

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  • Page 90 Electrical Box Layout (208-3-60) ECO 000297: 11-Jan-2022 Page 90 002138MAN-03...

  • Page 91: Wiring & Electrical Box Diagrams (460-3-60)

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  • Page 92 Electrical Box Layout (460-3-60) ECO 000297: 11-Jan-2022 Page 92 002138MAN-03...

  • Page 93: Wiring & Electrical Box Diagrams (575-3-60)

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  • Page 94 Electrical Box Layout (575-3-60) ECO 000297: 11-Jan-2022 Page 94 002138MAN-03...

  • Page 95: Wiring & Electrical Box Diagrams (220-1-50)

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  • Page 96 Electrical Box Layout (220-1-50) ECO 000297: 11-Jan-2022 Page 96 002138MAN-03...
  • Page 97 ECO 000297: 11-Jan-2022 Page 97 002138MAN-03...
  • Page 98 Electrical Box Layout (380-3-50) ECO 000297: 11-Jan-2022 Page 98 002138MAN-03...

  • Page 99: Refrigeration Circuit Diagram

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  • Page 100: 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 101: 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 R410a discharge pressure. LPS1/LO1 Low Pressure Sensor 1 R410a suction pressure.

  • Page 102: 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 R410a compressor. STAGE2 Compressor Stage 2 Starts / stops the R134a compressor. RV#1 Reversing Valve#1 Unused.

  • Page 103: Table A4 - Control Board Connector Descriptions (Right Side)

    TABLE A4 - Control Board Connector Descriptions (Right Side) Signal Description DI_1 Digital Input1 Unused. DI_0 Digital Input0 Low pressure select from open/closed loop harness (0=open loop, 1=closed loop) Phase Monitor2 Switch or dry contact from R to activate Summer Setback mode. Phase Monitor1 Unused.

  • Page 104: Appendix B: Power Packs &Usb Driver

    Appendix B - Power Packs & 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 Microsoft Power Packs and the USB driver.

  • Page 105: 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 106: 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 107 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 108 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 109: Warranty

    LIMITED WARRANTY MARITIME GEOTHERMAL LTD. warrants that its commercial geothermal heat pumps shall be free from defects in materials and workmanship for a period of ONE (1) YEAR after the date of installation or for a period of ONE (1) YEAR AND SIXTY (60) DAYS after the date of shipment, whichever occurs first.

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