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Nordic R Series Service Manual

Liquid to air geothermal heat pumps
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Application, Installation, & Service Manual
R/RH-Series
Liquid to Air Geothermal Heat Pumps
Two-Stage, R454b, GEN2
Model Sizes 45-75
R-Series
RH-Series
(R/RH 45-75)
Maritime Geothermal Ltd.
info@nordicghp.com
P.O. Box 2555, 170 Plantation Road
www.nordicghp.com
Petitcodiac, NB E4Z 6H4
002740MAN-01
(506) 756-8135
1-May-2025

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  • Page 1 Application, Installation, & Service Manual R/RH-Series Liquid to Air Geothermal Heat Pumps Two-Stage, R454b, GEN2 Model Sizes 45-75 R-Series RH-Series (R/RH 45-75) Maritime Geothermal Ltd. info@nordicghp.com P.O. Box 2555, 170 Plantation Road www.nordicghp.com Petitcodiac, NB E4Z 6H4 002740MAN-01 (506) 756-8135 1-May-2025...

  • Page 2: General Safety Precautions

    Search for any topic: LOOK FOR GREY TEXT BOXES LIKE THIS ONE THROUGHOUT MANUAL FOR A2L-SPECIFIC WARNINGS / INSTRUCTIONS refrigerant: mildly flammable. Installation and service work should only be performed by properly certified technicians with A2L-specific training. See also Service Procedures chapter.
  • Page 3 Search for any topic: Model Nomenclature R—65—HACW—X—1T—C—SDERF—xx Series: Revision: R = Reversing liquid to air, vertical 01, 02 etc. RH = Reversing liquid to air, horizontal Air Outlet Orientation: Nominal Size: F = field configurable 45 = 030 compressor (R: top or side) 55 = 040 compressor (RH: end or side) 65 = 051 compressor...

  • Page 4: Table Of Contents

    Domestic Hot Water (Desuperheater) Connections Standard Capacity Ratings Condensate Drain Pressure Drop Data Outdoor Loop Performance Tables 002511PDG - Typical Loop Connections - R Series 000970PDG - Desup. Connection to DHW Pre-Heat Tank Electrical Specifications Airflow Data Ductwork Blower Motor...

  • Page 5: Tables & Documents

    Documents 001915INF - Internal Plenum Heater Installation 002071CDG - Typical Thermostat Connections to GEN2 Control Board 002511PDG - Typical Loop Connections - R Series 000970PDG - Desuperheater Connection to DHW Pre-Heat Tank 001201CDG - Typical Duct and Condensate Connections 000608INF - Typical Horizontal Ground Loop Configuration...

  • Page 6: R/Rh Description

    General Overview In heating mode, the heat pump heats warm air in a duct The Nordic R/RH-series is a package water source heat system. As the unit operates, heat is extracted from the ground pump that can heat or chill air in a forced air duct system. The loop or well water.

  • Page 7: Sizing

    The second has a wider element profile for installation which is influenced by, for example, the number of levels, the outside the unit, in the ductwork. For RH series or for R series size of the windows, the orientation of the home, attached gar-...

  • Page 8: Installation Basics

    Search for any topic: Installation Basics Plenum Heater Installation (Accessory) A2L-SPECIFIC WARNING / INSTRUCTION The heat pump uses R454b, an refrigerant Be sure to specify the type of installation anticipated, which is a classification meaning “mildly flamma- since the plenum heater models are different for internal or ble”.

  • Page 9: R-Series Air Outlet Orientation

    Search for any topic: R-Series Air Outlet Orientation RH-Series Air Outlet Orientation The vertical R-series has a field configurable blower posi- The horizontal RH-series has a field configurable blower tion, resulting in top or side air discharge. Its default location position, resulting in straight through (side) or end air dis- from the factory is in the top of the unit, providing a “ninety”...

  • Page 10: Sample Bill Of Materials - Ground Loop Installations

    Search for any topic: Sample Bill of Materials - Sample Bill of Materials - Ground Loop Installations Open Loop Installations FROM MARITIME GEOTHERMAL FROM MARITIME GEOTHERMAL • R/RH SERIES HEAT PUMP (L OR R RETURN) • R/RH SERIES HEAT PUMP (L OR R RETURN) •...

  • Page 11: 001915Inf - Internal Plenum Heater Installation

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  • Page 12: Wiring

    Search for any topic: Wiring Power Supply Connections TABLE 5 - Plenum Heater Control Connections Power supply for the heat pump from the breaker panel is Signal Description supplied to the unit via concentric 1.093” / 0.875” knockouts. Common There are also several 7/8” knockouts and a 1/2” opening with Dry contact for auxiliary heat stage 1 plastic grommet (grommet hole is 3/8”) for connections to the air thermostat and outdoor loop circulators.

  • Page 13: Bacnet Connections

    Search for any topic: BACnet Connections Airflow Reduction for Zoning For zoning purposes, airflow may be reduced by a switch If using BACnet for external control of heating/cooling de- or dry contact using the connections on the right side of the con- mand and/or monitoring of status, use a shielded twisted pair to trol board.

  • Page 14: 002071Cdg - Typical Gen2 Thermostat Connections

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  • Page 15: Piping

    Search for any topic: Piping Domestic Hot Water Condensate Drain (Desuperheater) Connections The unit comes equipped with one 3/4” female PVC socket drain connection. This drain allows the condensate which forms The connections for the DHW circuit are 1/2” brass during the air conditioning cycle to be removed from the unit.

  • Page 16: 002511Pdg - Typical Loop Connections - R Series

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  • Page 17: 000970Pdg - Desup. Connection To Dhw Pre-Heat Tank

    Search for any topic: 1-May-2025 Page 17 002740MAN-01...

  • Page 18: Ductwork

    Search for any topic: Ductwork Blower Motor lar should be at least 12” away from the heater elements. The indoor unit is equipped with a direct drive ECM blower. If desired, the first 5-10 feet of the main supply trunks can The motor features a soft start function, and will maintain the be insulated internally with acoustical duct insulation to further programmed airflow up to the maximum external static value.

  • Page 19: 001201Cdg - Typical Duct And Condensate Connections

    Search for any topic: 1-May-2025 Page 19 002740MAN-01...

  • Page 20: Duct Sizing Guide

    Search for any topic: TABLE 11 - Duct Sizing Guide (external static of 0.20” H Minimum Return Air Airflow Diameter Airflow Duct Area Rectangular Equivalents (in) Diameter (CFM) (in) (L/s) (sq.in) (in) 2.25 x 10 3 x 8 3.5 x 6 4 x 5.5 5 x 5 2.25 x 10...

  • Page 21: Ground Loop Installations

    Search for any topic: Ground Loop Installations Refer to diagrams 000608INF & 000609INF at the end of Adjust the circulator pump module valves to connect the this chapter for typical ground loop configurations. They are for purge cart to the ground loop. Begin pumping water through the reference only, and should not be used to replace formal train- ground loop, ensuring that the intake of the pump stays ing and computerized loop design.

  • Page 22: Adding Antifreeze Solution

    Search for any topic: Once the lines have been filled and no more air bubbles are TABLE 13 - Volume of fluid per 100 ft. of pipe appearing in the line, adjust the circulator pump module valves Volume /100ft. to circulate water through the heat pump using the same technique as described above.

  • Page 23: 000608Inf - Typical Horiz. Ground Loop Configuration

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  • Page 24: 000609Inf - Typical Vert. Ground Loop Configuration

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  • Page 25: 000906Cdg - Circulator Pump Module Installation

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  • Page 26: 001823Cdg - Dual Flow Pump Module Installation

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  • Page 27: 002336Pdg - Pump Module Inst - 2 Units On 1 Loop

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  • Page 28: Open Loop Installations

    Search for any topic: Open Loop Installations Well Water Temperature tween the pumping fluid level and the pump intake) would con- tribute linearly to the flow rate should a larger pump be installed. The temperature of the well water should be a minimum of 41°F (5°C), and should normally be 45°F+ (7°C+).

  • Page 29: Water Valve

    Search for any topic: well for residential applications. The water returned to the well Figure 2: Open Loop Accessories & Tools will not necessarily be pumped into the same aquifer, depend- ing on underground conditions. The return well must be able to Cumulative Water supply at least the same quantity of water as the amount you...

  • Page 30: Water Flow Control

    Search for any topic: Water Flow Control If Y1 and Y2 are jumpered together, it is recommended to consult diagram 001901PDG found earlier in this manual, so A flow restricting (‘Dole’) valve is highly recommended, that stage 1 may be used for cooling in order to achieve better installed downstream of the water valve.

  • Page 31: 000907Cdg - Typical Open Loop Installation

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  • Page 32: 001822Cdg - Dual Flow Open Loop Installation

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  • Page 33: 000619Inf - Ground Water Disposal Methods

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  • Page 34: Pc Application (Pc App)

    Search for any topic: PC Application (PC App) NOTE: Before using the PC Application, refer to Appendices for installation instructions for the PC App and USB driver. Connect a USB cable between the PC and the control board USB connector located at the bottom center of the board. Use the Win- dows Start menu to launch the PC App.
  • Page 35 Search for any topic: View Menu: This menu handles all of the operational viewing screens. View-->Control Panel: The main control panel window will open, shown below. Heat pump model Click to disable the unit and information fully open electric valves to allow work to be done to the refrigeration system.
  • Page 36 Search for any topic: 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 37 Search for any topic: View-->Alarms, Limits and Faults (ALARMS LIST Tab) This tab show a history of alarms that have occurred while the PC App is connected, since it was last cleared. This button will erase the alarm events in the Alarm List. Each alarm that occurs while the PC APP is connected to the control...
  • Page 38 Search for any topic: 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 interface and buttons, or with a sensor. If a fault occurs, some things to try: •...
  • Page 39 Search for any topic: View-->Indoor Fan Shows the settings screen for the indoor fan/blower. Airflow may be adjusted up or down by the user within the allowed range. See Indoor Airflow Data section in the Model Specific Information chapter for airflow ranges. NOTE: This screen may also be accessed from the SET button of the Indoor Fan section of the Control Panel screen.
  • Page 40 Search for any topic: 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 41 Search for any topic: 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 sys- tem operation.
  • Page 42 Search for any topic: 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 unit can start again after various time when switching Count Reduce Time is alarm shutdowns...
  • Page 43 Search for any topic: Tools-->Set Date and Time This will synchronize the control board’s time and date to that of the connected Win- dows PC. It is normally only necessary at installation or if electrical power has been off for several days. Tools-->Datalogging (Datalog tab) A log will be automatically recorded at the following rates: •...
  • Page 44 Search for any topic: Tools-->Service Tools Tools-->Service Tools-->System Service Mode Disables the unit and fully opens electric valves to allow work to be done to the refrigeration system. (Also accessible via SERVICE button in View -->Control Panel window.) To exit service mode, main breaker must be turned off and then back on. Tools-->Service Tools-->Manual Override Allows individual control system demands or sensor values to be manually overridden for troubleshooting or service purposes.
  • Page 45 Search for any topic: Tools-->MODBUS-->Generic MODBUS This window is for developer use. The one useful function for users is that when troubleshooting MODBUS communi- cations faults, Communications Type may be set to SERIAL (Debug) for a short time and then back to MODBUS RTU to see if that resets the fault and prevents fault re- occurrence.

  • Page 46: Lcd Interface & Menus

    Search for any topic: 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: UP button:...

  • Page 47: Bacnet Interface

    Search for any topic: 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.
  • Page 48 Search for any topic: TABLE 17 - BACnet OBJECTS - DATA (Read Only) Name Property Units Description AI0 (Comp1_Current) Present Value Amps Compressor current draw AI1 (Comp2_Current) Present Value User Present Value ohms N/A (used for condensate sensor, see Alarms table) Present Value degF (degC) Compressor discharge line temperature...
  • Page 49 Search for any topic: TABLE 18 - BACnet OBJECTS - LIMITS Description (Read Only) Decimal Name BIT # Bit Description Value* Limits Low Outdoor OUT temperature (Present Value) High Outdoor OUT temperature Note: Limits object is type Analog Value but value is bit coded and may be decoded as such (integer value). Note * : Value is for a single alarm and reference only.
  • Page 50 Search for any topic: TABLE 20 - BACnet OBJECTS - FAULT Descriptions (Read Only) Name Data Type Description AI3 (Disch Temp) Analog Input Compressor discharge line temperature sensor faulty or disconnected AI4 (Cold Tank) Analog Input AI5 (Hot Tank) Analog Input LPS1 Analog Input Low pressure sensor faulty or disconnected...

  • Page 51: Startup Procedure

    Search for any topic: Startup Procedure The R/RH-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 52: Unit Startup

    Search for any topic: 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 53: Startup Record

    Search for any topic: Startup Record: R/RH-Series Installation Site Startup Date Installer City Company Province Model Country Serial # Homeowner Name Homeowner Phone # Check boxes unless asked to record data. Circle data units. PRE-START INSPECTION Ductwork Ductwork is completed, dampers/ diverters are adjusted Registers are open and clear of objects Air filter and end cap are installed Condensate Drain is connected, properly vented and free of debris...

  • Page 54: Routine Maintenance

    Search for any topic: Routine Maintenance MAINTENANCE SCHEDULE Item Interval Procedure Air Filter 6 months Inspect for dirt. Replace if necessary. Compressor 1 year Inspect for pitted or burned points. Contactor Replace if necessary. Condensate 1 year Inspect for clogs. Clean if necessary. Drain LCD Interface or When heat pump...
  • Page 55 Search for any topic: Coaxial Heat Exchanger Flushing Procedure - Closed Ground Loop 1. Isolate the heat exchanger by placing the pump module valves in the exchanger flushing position. 2. Connect a compressed air and a drain pipe to the pump module purge ports and blow the anti-freeze solution into a clean 5 gallon bucket.

  • Page 56: Troubleshooting Guide

    Search for any topic: Troubleshooting Guide The following steps are for troubleshooting the heat pump. If the problem is with the domestic hot water or the plenum heat- er, proceed to those sections at the end of the troubleshooting guide. Repair procedures and reference refrigeration circuit diagrams can be found later in this manual.

  • Page 57: Alarm Troubleshooting

    Search for any topic: ALARM TROUBLESHOOTING Description Recommended Action Alarm/Fault 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. Low Pressure A low pressure alarm occurs when the suction pressure drops to Go to the Low Pressure sec-...

  • Page 58: Fault Troubleshooting

    Search for any topic: FAULT TROUBLESHOOTING Alarm/Fault Description Recommended Action Pressure Sensors The sensor is reading outside of the ac- Replace the pressure sensor. If this does not recti- ceptable range. Check to ensure connect- fy the problem, replace the control board. or is on securely.
  • Page 59 Search for any topic: BACnet TROUBLESHOOTING Recommended Fault Possible Cause Verification Action BACnet Selected baud rate does Check baud rate of system. Adjust BACnet parame- communications not match building con- ters in the PC App’s not working trol system Tools-->Configuration properly Selected MAC address Check MAC address and Instance # in rela-...

  • Page 60: Compressor Troubleshooting

    Search for any topic: 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.

  • Page 61: Operation Troubleshooting

    Search for any topic: OPERATION TROUBLESHOOTING - HEATING MODE Possible Cause Verification Recommended Action Fault High or low Faulty sensor Compare pressure sensor reading Check wiring, replace sensor. If suction or dis- against a known reference such as a problem persists, replace control charge pressure new refrigeration manifold set.
  • Page 62 Search for any topic: OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High suction EEV stuck open Manually adjusting the EEV does not Go to EEV troubleshooting sec- pressure affect the superheat or the suction tion. (may appear to pressure.
  • Page 63 Search for any topic: OPERATION TROUBLESHOOTING - COOLING MODE Fault Possible Cause Verification Recommended Action Heating instead Thermostat not set up Verify that there is 24VAC across O Correct setup. of cooling properly and C of the terminal strip when calling for cooling.
  • Page 64 Search for any topic: OPERATION TROUBLESHOOTING - COOLING MODE Fault Possible Cause Verification Recommended Action High suction EEV stuck open Manually adjusting the EEV does Go to EEV troubleshooting section. pressure not affect the superheat or the suc- (may appear to tion pressure.
  • Page 65 Search for any topic: FAN/BLOWER TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Low airflow Dirty air filter Inspect. Replace. Dirty air coil Inspect. Clean. Poor ductwork Measure delta T between supply The ECM fan will provide proper and return ducts at the unit. In airflow up to 0.5 inH O.
  • Page 66 Search for any topic: EEV (Electronic Expansion Valve) TROUBLESHOOTING Electronic expansion valves are a great advancement over TVX’s, allowing more precise refrigerant control, but they do have a couple of limitations. a) EEV’s receive commands to open or close from the control board, but they don’t send any feedback to the control board to confirm that command has been received and acted upon.
  • Page 67 Search for any topic: PLENUM HEATER TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action No 230VAC Disconnect switch open. Verify disconnect switch is in the ON Determine why the disconnect across plenum (if installed) position. switch was opened, if all is OK heater L1 and L2 close the switch.
  • Page 68 Search for any topic: DOMESTIC HOT WATER (DESUPERHEATER) TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action Insufficient hot Thermostat on hot water Visually inspect the setting. Adjust the setting. water (tank tank set too low (should problem) be set at 120°F to 140°F) Breaker tripped, or fuse Check both line and load sides of Correct problem, and replace...

  • Page 69: Service Procedures

    Search for any topic: Service Procedures A2L-SPECIFIC WARNING / INSTRUCTION Servicing a Unit with an Refrigerant 1. Work procedure Work should be undertaken under a controlled procedure, for example according to an ordered checklist. This may be in contrast to how refrigeration service work has normally been performed in the past, and is to minimize the risk of flammable gas being present while the work is being performed .
  • Page 70 Search for any topic: A2L-SPECIFIC WARNING / INSTRUCTION Servicing a Unit with an Refrigerant (continued) 8. Checks to electrical devices & wiring Where electrical components are being changed, they should be as specified by Maritime Geothermal Ltd.. If in doubt, consult technical support for assistance. Electrical components should be inspected.

  • Page 71: Pumpdown Procedure

    Search for any topic: 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 coaxial coils must have full water flow during refrigerant recovery.

  • Page 72: Compressor Replacement Procedure

    Search for any topic: 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.

  • Page 73: Control Board Replacement Procedure

    Search for any topic: 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. 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

    Search for any topic: 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: Decommissioning

    Search for any topic: Decommissioning When the heat pump has reached the end of its useful lifetime after many years of service, it must be decommissioned. Before carrying out this procedure, it is essential that the technician is completely familiar with the system and all its con- nected equipment.

  • Page 76: Model Specific Information

    Search for any topic: Model Specific Information Table 21 - Refrigerant Charge MODEL Refrigerant Oil Type R/RH-45 R454b R/RH-55 R454b R/RH-65 R454b R/RH-75 11.0 R454b - Oil capacity is marked on the compressor label. - Refrigerant charge is subject to revision; actual charge is indicated on the unit nameplate.

  • Page 77: Standard Capacity Ratings

    Search for any topic: Standard Capacity Ratings Standards C13256-1 / ISO13256-1 / ARI 13256-1 Table 24 - Standard Capacity Ratings - Ground Loop Heating* 60Hz STAGE 1 - ELT 41°F (5°C) EAT 68°F (20°C) * 15% Methanol by Weight Ground Loop Fluid STAGE 2 - ELT 32°F (0°C) Input Liquid Flow...

  • Page 78: Pressure Drop Data

    Search for any topic: Pressure Drop Data Table 28: Loop Pressure Water 104°F Water 50°F Drop Data 15% Methanol 32°F 35% prop. glycol 32°F 0.25 0.32 0.38 0.44 0.50 0.57 R/RH- 0.63 0.69 0.76 0.82 0.88 11.3 0.95 12.5 0.38 0.44 0.50 0.57...
  • Page 79 Search for any topic: Table 28: Loop Pressure Water 104°F Water 50°F (cont’d) Drop Data 15% Methanol 32°F 35% prop. glycol 32°F 0.38 0.44 0.50 0.57 0.63 R/RH- 0.69 0.76 0.82 0.88 0.95 1.01 0.38 0.44 0.50 0.57 0.63 0.69 R/RH- 0.76 0.82...

  • Page 80: Performance Tables

    Search for any topic: Performance Tables R/RH-45-HAC*-X-1T R454b, 60 Hz, YAS30K1E-PFV OUTDOOR LOOP (15% Methanol) ELECTRICAL INDOOR LOOP (Air) Evap. Flow Delta T Heat Abs. Compressor Input Cond. Airflow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) Current (A)* Power (W) (°F) Temp.
  • Page 81 Search for any topic: Performance Tables R/RH-55-HAC*-X-1T R454b, 60 Hz, YAS40K1E-PFV OUTDOOR LOOP (15% Methanol) ELECTRICAL INDOOR LOOP (Air) Evap. Flow Delta T Heat Abs. Compressor Input Cond. Airflow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) Current (A)* Power (W) (°F) Temp.
  • Page 82 Search for any topic: Performance Tables R/RH-65-HAC*-X-1T R454b, 60 Hz, YAS51K1E-PFV OUTDOOR LOOP (15% Methanol) ELECTRICAL INDOOR LOOP (Air) Evap. Flow Delta T Heat Abs. Compressor Input Cond. Airflow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) Current (A)* Power (W) (°F) Temp.
  • Page 83 Search for any topic: Performance Tables R/RH-75-HAC*-X-1T R454b, 60 Hz, YAS60K1E-PFV OUTDOOR LOOP (15% Methanol) ELECTRICAL INDOOR LOOP (Air) Evap. Flow Delta T Heat Abs. Compressor Input Cond. Airflow Delta T Heating (°F) Temp. (gpm) (°F) (°F) (Btu/hr) Current (A)* Power (W) (°F) Temp.

  • Page 84: Electrical Specifications

    Search for any topic: Electrical Specifications Electrical Specifications TABLE 29 - R-Series (R454b) Electrical Specifications Out- Max. Min. Power Supply Compressor door Fuse/ Wire Code Circ. Breaker Size V-ø-Hz Max A Amps Amps Amps 208/230-1-60 14.6 22.9 26.6 #8-2* 208-3-60 18.2 20.7 #10-3*...

  • Page 85: Airflow Data

    Search for any topic: Airflow Data TABLE 31 - Airflow Range for STAGE 2 (Full Load) Airflow Reduction Airflow Reduction Airflow Reduction Airflow Reduction Nominal Range Model - 20% - 15% - 10% - 5% Size 1150 900-1400 430-660 1040 1090 1500 1200-1800...

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

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  • Page 88: Wiring Diagram (265/277-1-60)

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  • Page 89 Search for any topic: 1-May-2025 Page 89 002740MAN-01...

  • Page 90: Refrigeration Circuit Diagram

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  • Page 91: Dimensions: R-45 Left Return

    Search for any topic: Dimensions: R-45 Left Return RECOMMENDED RECOMMENDED FRONT CLEARANCE: RIGHT SIDE 2 FT CLEARANCE: 2 FT NO BACK CLEARANCE REQUIRED 1-May-2025 Page 91 002740MAN-01...

  • Page 92: Dimensions: R-45 Right Return

    Search for any topic: Dimensions: R-45 Right Return RECOMMENDED RECOMMENDED LEFT SIDE FRONT CLEARANCE: CLEARANCE: 2 FT 2 FT NO BACK CLEARANCE REQUIRED 1-May-2025 Page 92 002740MAN-01...

  • Page 93: Dimensions: R-55/65/75 Left Return

    Search for any topic: Dimensions: R-55/65/75 Left Return RECOMMENDED RECOMMENDED FRONT CLEARANCE: RIGHT SIDE 2 FT CLEARANCE: 2 FT NO BACK CLEARANCE REQUIRED 1-May-2025 Page 93 002740MAN-01...

  • Page 94: Dimensions: R-55/65/75 Right Return

    Search for any topic: Dimensions: R-55/65/75 Right Return RECOMMENDED RECOMMENDED LEFT SIDE FRONT CLEARANCE: 2 FT CLEARANCE: 2 FT NO BACK CLEARANCE REQUIRED 1-May-2025 Page 94 002740MAN-01...

  • Page 95: Dimensions: Rh-45 Left Return

    Search for any topic: Dimensions: RH-45 Left Return RECOMMENDED FRONT CLEARANCE: RECOMMENDED RIGHT SIDE CLEARANCE: 2 FT 2 FT 1-May-2025 Page 95 002740MAN-01...

  • Page 96: Dimensions: Rh-45 Right Return

    Search for any topic: Dimensions: RH-45 Right Return RECOMMENDED RECOMMENDED LEFT SIDE CLEARANCE: FRONT CLEARANCE: 2 FT 2 FT 1-May-2025 Page 96 002740MAN-01...

  • Page 97: Dimensions: Rh-55/65/75 Left Return

    Search for any topic: Dimensions: RH-55/65/75 Left Return RECOMMENDED FRONT CLEARANCE: RECOMMENDED RIGHT SIDE CLEARANCE: 2 FT 2 FT 1-May-2025 Page 97 002740MAN-01...

  • Page 98: Dimensions: Rh-55/65/75 Right Return

    Search for any topic: Dimensions: RH-55/65/75 Right Return RECOMMENDED RECOMMENDED LEFT SIDE CLEARANCE: FRONT CLEARANCE: 2 FT 2 FT 1-May-2025 Page 98 002740MAN-01...

  • Page 99: Appendix A: Control Board Description

    Search for any topic: 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 100 Search for any topic: 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 Measures discharge pressure. LPS1/LO1 Low Pressure Sensor 1 Measures suction pressure.
  • Page 101 Search for any topic: 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.
  • Page 102 Search for any topic: TABLE A4 - Control Board Connector Descriptions (Right Side) Name Description DI_1 Digital Input1 Not used. DI_0 Digital Input0 Low pressure select from open/closed loop harness (0=open loop, 1=closed loop) Phase Monitor2 Not used. Phase Monitor1 Not used.

  • Page 103: Appendix B: Usb Driver Installation

    Search for any topic: Appendix B - USB Driver Installation (Windows 10 & earlier 4. In the window that is displayed, click and hold down the NOTE: This step is not necessary for Windows 11. mouse button on the folder name, and drag to your desktop: The first step in connecting a Windows 10 or earlier laptop computer to the control board is to install the USB driver.

  • Page 104: Appendix C: Pc App Installation (Win11)

    Search for any topic: Appendix C - PC App Installation (Windows 11) The PC App allows detailed interfacing with the control board 4. Click on the downloads icon on your browser, or using a Windows laptop computer. These instructions are for otherwise view a list of your downloaded files: Windows 11.

  • Page 105: Appendix D: Pc App Installation (Win10)

    Search for any topic: Appendix D - PC App Installation (Windows 10 & earlier) 4. In the window that is displayed, click and hold down the The PC App allows detailed interfacing with the control board mouse button on the folder name, and drag to your desktop: using a Windows laptop computer.

  • Page 106: Appendix E: Updating Firmware

    Search for any topic: Appendix E: Updating Firmware METHOD 1: Updating Firmware Using PC App This method can be used when updating newer control boards 7. Click on YES. The following message box will appear: with bootloader version 2.0. This method will not work for older control boards with bootloader version 1.0 (approx.

  • Page 107: Reset To Defaults

    Search for any topic: 12. Click on Load Hex File. Select the 16. Close the PIC32 program. MGL_GEN2_V376.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 Search for any topic: 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

    Search for any topic: Warranty: R/RH-Series RESIDENTIAL LIMITED EXPRESS WARRANTY Unless a statement is specifically identified as a warranty, statements made by Maritime Geothermal Ltd. (“MG”) or its representatives relating to MG’s products, whether oral, written or contained in any sales literature, catalogue or agreement, are not express warranties and do not form a part of the basis of the bargain, but are merely MG’s opinion or commendation of MG’s products.

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