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Installation and Service Manual
RS-Series
Liquid to Air Split
Geothermal Heat
Pump
Two-Stage R410a
Model Sizes 25-80
Maritime Geothermal Ltd.
info@nordicghp.com
P.O. Box 2555, 170 Plantation Road
www.nordicghp.com
Petitcodiac, NB E4Z 6H4
002514MAN-01
(506) 756-8135
4-June-2021
Page 1
002514MAN-01
4-June-2021
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Table of Contents
Related Manuals for Nordic RS Series
Summary of Contents for Nordic RS Series
- Page 1 Installation and Service Manual RS-Series Liquid to Air Split Geothermal Heat Pump Two-Stage R410a Model Sizes 25-80 Maritime Geothermal Ltd. info@nordicghp.com P.O. Box 2555, 170 Plantation Road www.nordicghp.com Petitcodiac, NB E4Z 6H4 002514MAN-01 (506) 756-8135 4-June-2021 Page 1 002514MAN-01 4-June-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: RS COMPRESSOR UNIT OUTDOOR SIZE FUNCTION REFRIGERANT VOLTAGE COMPRESSOR REVISIONS COIL RS-25 HACW RS-45 HACW RS-55 HACW RS-65 HACW RS-75 HACW RS-80 HACW APPLICATION TABLE: AHH HORIZ. AIR HANDLER APPLICATION TABLE: AHV VERT. AIR HANDLER SIZE REFR. VOLTAGE CONFIG.
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Page 4: Table Of Contents
Table of Contents Tables, Figures, & Documents 000608INF - Typical Horiz. Ground Loop Configuration ..25 ......... 5 000609INF - Typical Vert. Ground Loop Configuration ..26 RS-Series System Description ......... 6 000906CDG - Circulator Pump Module Installation ....27 General Overview .............. -
Page 5: Tables, Figures, & Documents
002515CDG - Typical RS-Series Wiring Connections ................12 001901PDG - Wiring For Best Cooling Mode Dehumidification ............14 002516PDG - Typical Piping/Duct Connections - RS Series ..............16 000970PDG - Desuperheater Connection to DHW Pre-Heat Tank ............17 002384PDG - Desuperheater Connection to DHW Pre-Heat Tank - Multiple Units ......18 000608INF - Typical Horizontal Ground Loop Configuration .............. -
Page 6: Rs-Series System Description
(AHH) or vertical (AHV). Third party air handlers can ner tube available for open loop applications. Thermostatic also be used with the Nordic RS compressor unit; in this case expansion valves (TXVs) regulates superheat. The cabinets caution should be used to select an air handler that has a large are constructed from powder coated galvanized sheet metal. -
Page 7: Rs-Series Sizing
RS-Series Sizing Heat Pump Sizing Some background on Standard Capacity Ratings: closed ground loops are normally designed to reach a minimum tem- The following table is a rough guideline as to the size of perature of just below freezing at the end of the heating season, space each heat pump size can handle for ground loop (closed in order to take advantage of the latent heat of groundwater (at loop) installations. -
Page 8: Installation Basics
Ground Loop Installations Open Loop Installations FROM MARITIME GEOTHERMAL FROM MARITIME GEOTHERMAL • RS SERIES COMPRESSOR UNIT • RS SERIES COMPRESSOR UNIT • AHH (HORIZ.) OR AHV (VERTICAL) AIR HANDLER • AHH (HORIZ.) OR AHV (VERTICAL) AIR HANDLER • PLENUM HEATER __kW •... -
Page 9: Unpacking The Unit
Air Outlet & Return Orientation Unpacking the Unit On both the horizontal and vertical air handlers, the air When the RS compressor unit and air handler reach their outlet and return locations are fixed and not field-changeable. destination, they should be immediately unpacked to determine Therefore there are no factory options like right/left return. -
Page 10: Wiring
The air handler is powered from its own breaker. Note that move the red wire connected to the 240 ter- only single phase electrical service is available for the Nordic minal of the transformer to the 208 terminal AHH/AHV, so the advice of an electrician or alternate air of the transformer. -
Page 11: Thermostat Connections
2 stage heat 1 Air Handler Blower Motor TABLE 8 - Thermostat Signal Connections The Nordic AHH/AHV air handler is equipped with a direct drive ECM fan motor for maximum efficiency. The motor fea- Signal... -
Page 12: 002515Cdg - Typical Rs-Series Wiring Connections
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Page 13: Safety Controls
Safety Controls Open/Closed Loop LPC Selection The heat pump has two important built in safety controls There are two low pressure safety controls in the heat which are designed to protect the unit from situations which pump: 75 psi for open loop (water), and 55 psi for closed loop could damage it should the operation of the refrigeration circuit (antifreeze). -
Page 14: 001901Pdg - Wiring For Best Cooling Mode Dehum
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Page 15: Piping
Piping RS Compressor Unit: RS Compressor Unit: Outdoor Loop Domestic Hot Water (Desuperheater) The connections for the Outdoor Loop circuit are 1” brass female NPT. They are labelled OUTDOOR IN and The connections for the DHW circuit are 1/2” brass OUTDOOR OUT. -
Page 16: 002516Pdg - Typical Piping/Duct Connections
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Page 17: 000970Pdg - Desup. Connection To Dhw Pre-Heat Tank
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Page 18: 002384Pdg - Dhw Pre-Heat Tank - Multiple Units
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Page 19: Refrigerant Connections
Refrigerant Connections Line Set Interconnect Tubing TABLE 14a - 3-way Service Valve Tooling Once both the RS compressor unit and AHH/AHV air Line set Hex key to Charging Nominal Valve cap handler have been mounted, the line set may be run between connection open/ port cap... -
Page 20: Pipe Insulation
Pipe Insulation Charging the System All line set refrigerant piping between the two units should The RS compressor unit is pre-charged for line sets up to be insulated with 3/8” thick closed cell pipe insulation to prevent 20 ft long. Once the system has been vacuumed, if extra condensation and dripping onto floors or walls during the refrigerant is required due to the length of the line set, it may be heating season. -
Page 21: Ductwork
Ductwork Blower Motor Duct Systems - Grill Layout The AHH/AHV air handler is equipped with a direct drive Most forced air heating systems in homes have the floor ECM blower. See Wiring chapter for description and airflow grills placed around the perimeter of the room. Supply grills adjustment. -
Page 22: Duct Sizing Guide
TABLE 18 - 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 3 x 8... -
Page 23: Ground Loop Installations
Ground Loop Installations Refer to diagrams 000608INF & 000609INF at the end of Adjust the circulator pump module valves to connect the this section 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 24: Adding Antifreeze Solution
Once the lines have been filled and no more air bubbles are TABLE 20 - 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 25: 000608Inf - Typical Horiz. Ground Loop Configuration
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Page 26: 000609Inf - Typical Vert. Ground Loop Configuration
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Page 27: 000906Cdg - Circulator Pump Module Installation
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Page 28: 001823Cdg - Dual Flow Pump Module Installation
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Page 29: 002336Pdg - Pump Module Inst - 2 Units On 1 Loop
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Page 30: Open Loop Installations
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 31: Water Valve
A return well should be a minimum of 80 ft. from the supply Figure 2: Open Loop Accessories & Tools well for residential applications. The water returned to the well will not necessarily be pumped into the same aquifer, depend- Cumulative Water ing on underground conditions. -
Page 32: Submersible Pump Selection
Plumbing the Heat Pump low refrigerant discharge pressure when in cooling mode. Dole valves are available as an accessory. The port connections for the Outdoor Loop are 1” brass FPT fittings. They are marked as OUTDOOR IN and OUT. Dole valves can emit a ‘whistling’ sound if the pressure drop through them is high. -
Page 33: 000907Cdg - Typical Open Loop Installation
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Page 34: 001822Cdg - Dual Flow Open Loop Installation
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Page 35: 000619Inf - Ground Water Disposal Methods
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Page 36: Startup Procedure
Startup Procedure The 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 Geo- thermal Ltd. -
Page 37: 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. Preparation: 1. -
Page 38: Startup Record
Startup Record: RS-Series Size 25-80 Two-Stage R410a 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 39: Routine Maintenance
Routine Maintenance MAINTENANCE SCHEDULE Item Interval Procedure Control Board Weekly Check status light for faults. Rectify problem if alarms found. See Troubleshooting chapter. Air Filter 6 months Inspect for dirt. Replace if necessary. Compressor 1 year Inspect for pitted or burned points. Contactor Replace if necessary. -
Page 40: Troubleshooting Guide
Troubleshooting Guide The following steps are for troubleshooting the geothermal heat pump. If the problem is with the domestic hot water or the plenum heater, proceed to those sections at the end of the troubleshooting guide. Repair procedures and reference refriger- ation circuit diagrams can be found at the end of the troubleshooting guide. - Page 41 FAULT CODE TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Fault Code 1 High operating refrigerant Using a refrigeration gauge set, veri- See “High Discharge Pressure” in (High Pressure pressure fy that high pressure approaches or Heating Mode / Cooling Mode Control) exceeds 565psi with compressor on.
- Page 42 COMPRESSOR TROUBLESHOOTING Fault Possible Cause Verification Recommended Action Compressor will Faulty Measuring from C on the terminal Replace control board control board not start strip, verify there is voltage at Y, HP1, HP2, LP1, LP2, and both flow pins but no voltage present at CC. Faulty run capacitor Check value with capacitance meter.
- Page 43 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High Discharge Low airflow See Fan Troubleshooting section Correct the problem. Pressure TXV in compressor unit Verify superheat. It should be be- Adjust TXV to obtain 8-12°F adjusted too far closed tween 8-12°F (3-6°C).
- Page 44 OPERATION TROUBLESHOOTING - HEATING MODE Fault Possible Cause Verification Recommended Action High Suction Leaking reversing valve Reversing valve is the same temper- Tap reversing valve, and switch it Pressure ature on both ends of body, com- back and forth between heating (may appear to mon suction line is warm, compres- and cooling positions.
- Page 45 OPERATION TROUBLESHOOTING - COOLING MODE Fault Possible Cause Verification Recommended Action High Discharge Unit is overcharged High subcooling, low delta T across Remove 1/2lb of refrigerant at a pressure (Only possible if unit has water coil. time and verify that the discharge been field serviced and pressure reduces.
- Page 46 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, it in airflow up to 0.5 inH2o for 1/2HP heating mode, it should not be motors and 0.7 inH2o for 1HP...
- Page 47 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 48 PLENUM HEATER TROUBLE SHOOTING Fault Possible Cause Verification Recommended Action No 24VAC signal Faulty Plenum Heater 24VAC is present across pin 1 and Replace relay. from 1 to ground Relay in heat pump pin 3 of the relay, 24VAC is present at the plenum from heat pump terminal strip I to heater control...
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Page 49: Repair Procedures
Repair Procedures Pumpdown Procedure 1. Connect the refrigerant recovery unit to the compressor unit’s internal service ports via a refrigeration charging mani- fold and to a recovery tank as per the instructions in the recovery unit manual. Plan to dispose of refrigerant if there was a compressor burnout. -
Page 50: Compressor Replacement Procedure
Compressor Replacement Procedure 1. Pump down the system 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 51: Model Specific Information
Model Specific Information Table 22 - Shipping Information: RS Compressor Unit Table 25 - Refrigerant Charge WEIGHT DIMENSIONS in (cm) MODEL Refrigerant Oil Type MODEL lb. (kg) RS-25 R410a RS-45 R410a RS-25 266 (121) 34 (86) 34 (86) 35 (89) RS-55 R410a RS-45... -
Page 52: Standard Capacity Ratings
Standard Capacity Ratings Standards C13256-1 / ISO13256-1 / ARI 13256-1 Table 28 - 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) Nominal Pressure Input... -
Page 53: Pressure Drop Data
Pressure Drop Data Table 32: Loop Pressure Water 104°F Water 50°F 15% Methanol 32°F 35% prop. glycol 32°F Drop Data 0.25 0.32 0.38 0.44 0.50 RS-25 0.57 0.63 0.69 0.76 10.1 0.82 0.25 0.32 0.38 0.44 0.50 0.57 RS-45 0.63 0.69 0.76 0.82... - Page 54 Table 32: Loop Pressure Water 104°F Water 50°F 15% Methanol 32°F 35% prop. glycol 32°F (cont’d) Drop Data 0.38 0.44 0.50 0.57 0.63 RS-65 0.69 0.76 0.82 0.88 0.95 1.01 0.38 0.44 0.50 0.57 0.63 0.69 RS-75 0.76 0.82 0.88 0.95 1.01 1.07...
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Page 55: Performance Tables: Rs-25
Performance Tables RS-25-HACW-P-1T R410a, 60 Hz, ZPS20K5E-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. (cfm) (°F) (°F) -
Page 56: Performance Tables: Rs-45
Performance Tables RS-45-HACW-P-1T R410a, 60 Hz, ZPS30K5E-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. (cfm) (°F) (°F) -
Page 57: Performance Tables: Rs-55
Performance Tables RS-55-HACW-P-1T R410a, 60 Hz, ZPS40K5E-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. (cfm) (°F) (°F) -
Page 58: Performance Tables: Rs-65
Performance Tables RS-65-HACW-P-1T R410a, 60 Hz, ZPS51K5E-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. (cfm) (°F) (°F) -
Page 59: Performance Tables: Rs-75
Performance Tables RS-75-HACW-P-1T R410a, 60 Hz, ZPS60K5E-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. (cfm) (°F) (°F) -
Page 60: Performance Tables: Rs-80
Performance Tables RS-80-HACW-P-1S R410a, 60 Hz, ZP70KWE-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. (cfm) (°F) (°F) -
Page 61: Airflow Data
Airflow Data Table 33: MED Airflow (nominal) STAGE 2 STAGE 1 FAN ONLY (Recirculation) AR1-AR2 AR1-AR2 AR1-AR2 Model Full Full Full reduction reduction reduction 1200 1020 1030 1500 1275 1240 1054 1900 1615 1540 1309 1064 2100 1785 1660 1411 1176 1000 2400... -
Page 62: Electrical Specifications: Rs Compressor Unit
Electrical Specifications: RS Compressor Unit Out- Max. Min. Power Supply Compressor door Fuse/ Wire TABLE Elec. Circ. Breaker Size Code V-ø-Hz Max A Amps Amps Amps 208/230-1-60 10.9 15.7 18.4 #10-2* 208-3-60 11.3 12.9 #12-3* RS-25 460-3-60 #14-3 220-1-50 14.0 16.3 #12-2 380-3-50... -
Page 63: Electrical Specifications: Ahh/Ahv Air Handler
Electrical Specifications: AHH/AHV Air Handler Max. Min. Power Supply Fuse/ Wire TABLE Elec. Breaker Size Code V-ø-Hz Amps Amps Amps 208/230-1-60 #14-2 AHH-25 265/277-1-60 #14-2 AHV-25 220-1-50 #14-2 208/230-1-60 #14-2 AHH-45 265/277-1-60 #14-2 AHV-45 220-1-50 #14-2 208/230-1-60 #14-2 AHH-55 265/277-1-60 #14-2 AHV-55 220-1-50... -
Page 64: Wiring Diagram: Rs Compressor Unit (208/230-1-60)
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Page 65: Electrical Box Layout: Rs Compressor Unit
Electrical Box Layout: RS Compressor Unit 4-June-2021 Page 65 002514MAN-01... -
Page 66: Wiring Diagram: Ahh Horizontal Air Handler
Wiring Diagram: AHH Horizontal Air Handler Wiring Diagram: AHV Vertical Air Handler 4-June-2021 Page 66 002514MAN-01... -
Page 67: Refrigeration Circuit - Heating Mode
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Page 68: Refrigeration Circuit - Cooling Mode
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Page 69: Dimensions: Model Sizes 25/45
Dimensions: RS-25/45 Compressor Unit Dimensions: AHH-25/45 Horizontal Air Handler Dimensions: AHV-45 Air Vertical Handler 4-June-2021 Page 69 002514MAN-01... -
Page 70: Dimensions: Model Sizes 55/65/75/80
Dimensions: RS-55/65/75/80 Compressor Unit Dimensions: AHH-55/65/75/80 Horizontal Air Handler Dimensions: AHV-55/65/75/80 Vertical Air Handler 4-June-2021 Page 70 002514MAN-01... -
Page 71: Warranty
LIMITED EXPRESS WARRANTY It is expressly understood that unless a statement is specifically identified as a warranty, statements made by Maritime Geothermal Ltd., a corporation registered in New Brunswick, Canada, (“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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