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Application, Installation, & Service Manual
AHW-65
(horizontal)
Maritime Geothermal Ltd.
P.O. Box 2555, 170 Plantation Road
Petitcodiac, NB E4Z 6H4
(506) 756-8135
5-Jul-2022
AHW / AH4P-
Series
Hydronic
Air
Handlers
Model Size 65
AH4P-65
(horizontal)
AH4P-65
(vertical)
Page 1
5-Jul-2022
AHW-65
(vertical)
info@nordicghp.com
www.nordicghp.com
002596MAN-01
002596MAN-01
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Table of Contents
Summary of Contents for Nordic AHW Series
- Page 1 Application, Installation, & Service Manual AHW / AH4P- Series Hydronic AHW-65 (vertical) AHW-65 (horizontal) Handlers Model Size 65 AH4P-65 AH4P-65 (vertical) (horizontal) Maritime Geothermal Ltd. info@nordicghp.com P.O. Box 2555, 170 Plantation Road www.nordicghp.com Petitcodiac, NB E4Z 6H4 002596MAN-01 (506) 756-8135 5-Jul-2022 Page 1 002596MAN-01...
- 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 system, ensure all power sources are DISCONNECTED.
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Page 3: Table Of Contents
Table of Contents Tables & Documents Duct Systems - Grill Layout ..........11 ............3 Thermostat Location ............. 11 AHW/AH4P-Series Description ........4 Plenum Heater ..............11 General Overview ..............4 Duct Sizing Guide ..............12 Factory Options ..............4 Startup Procedure ............ -
Page 4: Ahw/Ah4P-Series Description
The room thermostat or zone controller calls for either one selectable airflow, or one of five airflows, from 900-2300 cfm. If The Nordic AHW-series and AH4P-series are ducted hy- the –VSP option is ordered, it is also possible for the thermostat... -
Page 5: Installation Basics
Installation Basics Sample Bill of Materials Unpacking the Unit When the air handler reaches the site it should be FROM MARITIME GEOTHERMAL unpacked to determine if any damage has occurred during • AHW/AH4P SERIES AIR HANDLER shipment. Any visible damage should be noted on the carrier's •... -
Page 6: Ah4P Horizontal - Switching The Air Outlet Orientation
AH4P Horizontal - Plenum Heater Installation Switching the Air Outlet Orientation When ordering the plenum heater (which is ordered as The AH4P horizontal model only has a field configurable an accessory), be sure to specify the type of installation blower position, resulting in straight through (side) or back air anticipated, since the plenum heater models are different discharge. -
Page 7: Wiring
Wiring Power Supply Connections that a simultaneous G call is required, and that especially for externally installed plenum heaters (as for AH4P-series), an The air handler has a 0.875” knockout for main power sup- airflow setting resulting in an air velocity of at least 400 ft/min at ply connection from the breaker panel to the electrical box. -
Page 8: Thermostat Requirements (-Vsp Models)
Thermostat Requirements Water Valve Control with AH4P-Series (-VSP models) It should be noted that if an AH4P-series air handler is to be used for heating or cooling duty (rather than dehumidifica- For –VSP models (e.g. AHW-65-VSP-...), the thermostat tion), the two water valves will have to be controlled by the ther- or controller does not call for one discreet airflow value, but in- mostat or controller directly. -
Page 9: Piping
Piping Condensate Drain The unit comes equipped with one 3/4” female PVC socket drain connection. This drain allows the condensate which forms during the air conditioning cycle to be removed from the unit. The drain should be connected and vented as per local codes; an example is shown on the following page. -
Page 10: 002601Pdg - Typical Duct & Piping Connections - Ahw
5-Jul-2022 Page 10 002596MAN-01... -
Page 11: Duct Systems - Grill Layout
Ductwork Zoning Duct Systems - Grill Layout The air handler is most commonly configured as one of Most forced air heating systems in homes have the floor several zones on the hydronic system. grills placed around the perimeter of the room. Heating supply grills should be placed under a window when possible to help Zoning of the air handler’s air duct system can also be prevent condensation on the window. -
Page 12: Duct Sizing Guide
TABLE 7 - 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 13: Startup Procedure
Startup Procedure The AHW/AH4P-Series Startup Record located in this manual is used in conjunction with this startup procedure to provide a de- tailed 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 14: 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 15: Startup Record
Startup Record: AHW/AH4P-Series Installation Site Startup Date Installer City Company Province Model Country Serial # Client Name Client 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 16: Routine Maintenance Maintenance Schedule
Routine Maintenance MAINTENANCE SCHEDULE Item Interval Procedure Air Filter 6 months Inspect for dirt. Replace if necessary. Condensate 1 year Inspect for clogs. Clean if necessary. Drain When experiencing Water to Air Fin contamination: performance degrada- Inspect outside surface of fins for dirt that has gotten Heat Exchanger tion that is not ex- by air filter, perhaps due to not changing filter at rec-... -
Page 17: Troubleshooting Guide
Troubleshooting Guide STEP 1: If there is a thermostat powered from the air handler’s R and C terminals, verify that the display is present. If it is not, proceed to POWER SUPPLY TROUBLESHOOTING; otherwise proceed to STEP 2. STEP 2: If a 24VAC signal does not appear across G and C of the air handler’s terminal strip (or a DC signal across 0-10VDC+ and GND for –VSP models) within 6 minutes, proceed to the THERMOSTAT TROUBLESHOOT- ING section;... - Page 18 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 constant airflow ECM blower and return ducts at the unit, and will provide the demand airflow compare to the performance tables up to 0.5 inH O duct backpres-...
- Page 19 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.
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Page 20: Shipping Information
Model Specific Information Table 8 - Shipping Information WEIGHT DIMENSIONS in (cm) MODEL lb. (kg) AHW-65 (horizontal) 197 (89) 50 (127) 36 (91) 30 (76) AHW-65 (vertical) 197 (89) 38 (97) 32 (81) 50 (127) AH4P-65 (horizontal) 255 (116) 50 (127) 36 (91) 30 (76) AH4P-65 (vertical) -
Page 21: Airflow
Airflow Table 11: Airflow (24VAC Control) AIRFLOW Dry contact from Comment R to this terminal: 1200 1200 1500 1500 1900 1900 2300 2300 May be limited by 80oz.ft torque limit at high static pressures. 1090 Table 12: Airflow (-VSP Models, 0-10VDC Control) DC voltage ap- AIRFLOW plied from... -
Page 22: Performance Tables: Horizontal Models (Heating)
Performance Tables - Horizontal Models AHW/AH4P-65 Horizontal Water EWT = 100°F EWT = 110°F EWT = 120°F EWT = 140°F EWT = 160°F Water Airflow Pressure Flow Capacity Capacity Capacity Capacity Capacity (°F) (cfm) Drop (gpm) (Btu/hr) (°F) (°F) (Btu/hr) (°F) (°F) (Btu/hr) -
Page 23: Performance Tables: Horizontal Models (Cooling)
Performance Tables - Horizontal Models AHW/AH4P-65 Horizontal EWT = 40°F EWT = 45°F EWT = 50°F Water Water Airflow Pressure Total Sensible Total Sensible Total Sensible Flow (°F) (cfm) Drop Capacity Capacity Capacity Capacity Capacity Capacity (gpm) (°F) (°F) (°F) (°F) (°F) (°F) -
Page 24: Performance Tables: Vertical Models (Heating)
Performance Tables - Vertical Models AHW/AH4P-65 Vertical Water EWT = 100°F EWT = 110°F EWT = 120°F EWT = 140°F EWT = 160°F Water Airflow Pressure Flow Capacity Capacity Capacity Capacity Capacity (°F) (cfm) Drop (gpm) (Btu/hr) (°F) (°F) (Btu/hr) (°F) (°F) (Btu/hr) -
Page 25: Performance Tables: Vertical Models (Cooling)
Performance Tables - Vertical Models AHW/AH4P-65 Vertical EWT = 40°F EWT = 45°F EWT = 50°F Water Water Airflow Pressure Total Sensible Total Sensible Total Sensible Flow (°F) (cfm) Drop Capacity Capacity Capacity Capacity Capacity Capacity (gpm) (°F) (°F) (°F) (°F) (°F) (°F) -
Page 26: Wiring Diagram (24Vac Airflow Control)
Wiring Diagram (24VAC Airflow Control) 5-Jul-2022 Page 26 002596MAN-01... -
Page 27: Wiring Diagram (-Vsp Models, 0-10Vdc Airflow Control)
Wiring Diagram (-VSP models, 0-10VDC Airflow Control) 5-Jul-2022 Page 27 002596MAN-01... -
Page 28: Dimensions: Ahw
Dimensions: AHW-65 Horizontal Dimensions: AHW-65 Vertical 5-Jul-2022 Page 28 002596MAN-01... -
Page 29: Dimensions: Ah4P
Dimensions: AH4P-65 Horizontal Dimensions: AH4P-65 Vertical 5-Jul-2022 Page 29 002596MAN-01... -
Page 30: Warranty
LIMITED WARRANTY MARITIME GEOTHERMAL LTD. warrants that its hydronic air handlers 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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