Nordic ATW Series - User Manual

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ISSUE 02: 7-Dec-2021 Page 1 001970MAN-04

Maritime Geothermal Ltd.

P.O. Box 2555, 170 Plantation Road

Petitcodiac, NB E4Z 6H4

(506) 756-8135

ATW-Series

Reversing Central Air to Water Heat Pump

Two-Stage R410a

Model Sizes 25-75

info@nordicghp.com

www.nordicghp.com

001970MAN-04

ISSUE 02: 7-Dec-2021

Installation and Service Manual

Main Page

Default Chapter4
- Table of Contents4
Tables & Documents5
ATW System Description6
- General Overview6
- Heating Mode6
  - Auxiliary Heat6
  - Defrost Operation6
- Cooling Mode6
One or Two Buffer Tanks7
- Single Buffer Tank Systems7
- Dual Buffer Tank Systems7
ATW Sizing8
- Air Source Heat Pumps8
- Heat Pump Sizing8
- Auxiliary Heat Sizing8
- Table 1 - Heat Pump Size Vs. Heated Area8
- Table 2 - Auxiliary Heat Sizing8
Installation Basics9
- Sample Bill of Materials9
- Unpacking the Unit9
- Indoor Unit Placement9
- Outdoor Unit Placement10
- Outdoor Fan Speed Reduction10
- Outdoor Unit Mounting Height10
- Average Max. Snow Depth Map - Canada11
Wiring12
- Indoor Unit Power Supply Connections12
- Outdoor Unit: Power Connections12
- Indoor Loop Circulator Pump Wiring12
- Control Transformer12
- Table 3 - Power Supply Connections12
- Table 4 - Outdoor Unit Power Supply Connections12
- Table 5 - Indoor Loop Circulator Connections12
- Table 6 - Control Transformer12
- Bacnet Connections13
- Setpoint Control Connections13
- Setpoint Control: Aux. Connections13
- Table 7 - Bacnet Connections13
- Table 8 - Setpoint Control Connections13
- Table 9 - Setpoint Control: Aux. Connections13
- Outdoor Unit: Signal Connections14
- Aquastat Connections (Optional)14
- Disable Switch (Field Installed)14
- Defrost Indicator (Field Installed)14
- Table 10 - Outdoor Unit Signal Connections14
- Table 11 - Aquastat (Signals Control) Connections14
- 002019CDG - Typ. ATW Series Wiring15
- 002375QSS - Altsource Tanks: Getting Started16
- 002067CDG - Typ. Heating Only Zone Wiring (Setpoint)17
- 002068CDG - Typ. Htg/Cooling Zone Wiring (Setpoint)18
- 002069CDG - Typ. Heating Only Zone Wiring (Signals)19
- 002070CDG - Typ. Htg/Cooling Zone Wiring (Signals)20
Piping21
- Number of Tanks21
- Indoor Loop Water Lines21
- Domestic Hot Water (Desuperheater) Connections21
- Table 12 - Buffer Tank Size21
- 002239PDG - Typical Piping Connections - ATW Series22
- 002366PDG - Recommended Buffer Tank Piping23
- 002528PDG - Buffer Tank Piping - Multiple Units24
- 002252PDG - 2 Tank Piping with a Reversing Heat Pump25
- 002527PDG - 2 Tank Piping W/Multiple Rev. Heat Pumps26
- 002367PDG - Auxiliary Boiler Piping27
- 000530PDG - Typical Zone Types28
- 001055PDG - Connection to On-Demand DHW Tank29
- 000970PDG - Desup. Conn. to DHW Pre-Heat Tank30
- 002384PDG - DHW Pre-Heat Tank - Multiple Units31
Outdoor Unit Line Set32
- Line Set Interconnect Tubing32
- Indoor/Outdoor Unit Connections32
- Oil Traps32
- Filter-Dryer32
- Table 13 - Line Set Sizing32
- Table 14A - 3-Way Service Valve Tooling32
- Table 14B - 3-Way Service Valve Torques32
- Pipe Insulation33
- Silver Soldering Line Sets33
- Pressure Testing33
- Vacuuming the System33
- Charging the System33
- Table 15 - Extra Charge for Model Sizes 25-4533
- Table 16 - Extra Charge for Model Sizes 55-7533
- 001983CDG - Typical ATW Line Set Connections34
Operation35
- Bacnet Control35
- Signals / Hardwired Control35
- Setpoint Control35
- Setpoint Control Method 1 - Indoor Loop (ICR) One Tank35
- Setpoint Control Method 2 - Indoor Loop (ICR), 2 Tanks37
- Setpoint Control Method 3 - External HTS/CTS, One Tank38
- Setpoint Control Method 4 - External HTS/CTS, 2 Tanks39
PC Application (PC App)40
LCD Interface & Menus52
Bacnet Interface54
- Table 19 - Bacnet Objects - Control Signals (Read/Write)54
- Table 20 - Bacnet Objects - Operation Mode Description (Read Only)54
- Table 21 - Bacnet Objects - Limits Description (Read Only)54
- Table 22 - Bacnet Objects - Data (Read Only)55
- Table 23 - Bacnet Objects - Defrost Mode Description (Read Only)56
- Table 24 - Bacnet Objects - Alarm Descriptions (Read Only)56
- Table 25 - Bacnet Objects - Fault Descriptions (Read Only)57
Startup Procedure58
- Pre-Start Inspection58
- Unit Startup59
- Startup Record60
Routine Maintenance61
Troubleshooting Guide62
Repair Procedures72
- Pumpdown Procedure72
- General Repair Procedure72
- Vacuuming & Charging Procedure72
- Compressor Replacement Procedure73
- Outdoor Fan Replacement Procedure73
- Control Board Replacement Procedure74
- LCD Interface (Display) Board Replacement Procedure75
Model Specific Information76
- Shipping Information76
- Refrigerant Charge76
- Indoor Loop Flow Rates76
- Operating Temperature Limits76
- Sound Levels (Dba)76
- Table 26 - Shipping Information (Indoor Unit)76
- Table 27 - Shipping Information (Outdoor Unit)76
- Table 28 - Refrigerant Charge76
- Table 29 - Indoor Loop Flow Rates76
- Pressure Drop Data77
- Table 33: Loop Pressure Drop Data77
- Standard Capacity Ratings79
- Table 34 - Standard Capacity Ratings - Heating79
- Table 35 - Standard Capacity Ratings - Cooling79
- Performance Tables80
- Electrical Specifications85
- Table 36 - ATW-Series Electrical Data85
- Wiring Diagram (208/230-1-60)86
- Electrical Box Layout (208/230-1-60)87
- Wiring Diagram (208-3-60)88
- Electrical Box Layout (208-3-60)89
- Wiring Diagram (460-3-60)90
- Electrical Box Layout (460-3-60)91
- ACE-45/55 Wiring Diagram92
- ACE-65/75 Wiring Diagram92
- ATW-Series Refrigeration Circuit - Heating Mode93
- ATW-Series Refrigeration Circuit - Cooling/Defrost Mode94
- Dimensions: ATW-25/4595
- Dimensions: ATW-5597
- Dimensions: ATW-65/7599
Appendix A: Control Board Description101
- Table A1 - Control Board Connector Descriptions (Top)102
- Table A2 - Control Board Connector Descriptions (Left Side)102
- Table A3 - Control Board Connector Descriptions (Bottom)103
- Table A4 - Control Board Connector Descriptions (Right Side)104
Appendix B: USB Driver Installation105
Appendix C: PC App Installation106
Appendix D: Updating Firmware107
Warranty110

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Nordic ATW Series Specifications

General

Brand	Nordic
Model	ATW Series
Category	Heat Pump
Language	English

Nordic ATW Series - User Manual

Table of Contents

Nordic ATW Series Specifications