Nordic AH4P Series Service Manual Download Page 1

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5-Jul-2022

Page 1

002596MAN-01

AHW / AH4P-

Series

Hydronic

Air

Handlers

Model Size 65

Maritime Geothermal Ltd.

P.O. Box 2555, 170 Plantation Road

Petitcodiac, NB E4Z 6H4

(506) 756-8135

[email protected]

www.nordicghp.com

002596MAN-01

5-Jul-2022

Application, Installation, & Service Manual

AHW-65

(horizontal)

AHW-65
(vertical)

AH4P-65

(horizontal)

AH4P-65

(vertical)

Summary of Contents for AH4P Series

Page 1: ...el Size 65 Maritime Geothermal Ltd P O Box 2555 170 Plantation Road Petitcodiac NB E4Z 6H4 506 756 8135 info nordicghp com www nordicghp com 002596MAN 01 5 Jul 2022 Application Installation Service Manual AHW 65 horizontal AHW 65 vertical AH4P 65 horizontal AH4P 65 vertical ...

Page 2: ...ed APPLICATION TABLE MODEL CONTROL METHOD VOLTAGE ORIENTATION REVISIONS AHW 65 0 1 T V S H 02 AHW 65 VSP 0 1 T V S H 02 AH4P 65 0 1 T V S H 02 AH4P 65 VSP 0 1 T V S H 02 This manual applies only to the models and revisions listed in this table AIR COIL BLOWER S D E S D E S D E S D E SAFETY PRECAUTIONS Model Nomenclature Series AHW 2 pipe hydronic air handler AH4P 4 pipe hydronic air handler Nomina...

Page 3: ...formation 20 Shipping Information 20 Electrical Specifications 20 Plenum Heater Electrical Specifications 20 Airflow 21 Performance Tables Horizontal Models Heating 22 Performance Tables Horizontal Models Cooling 23 Performance Tables Vertical Models Heating 24 Performance Tables Vertical Models Cooling 25 Wiring Diagram 24VAC Airflow Control 26 Wiring Diagram VSP Models 0 10VDC Airflow Control 27...

Page 4: ...provision for an internal electric ple num heater which can be ordered as an accessory If a ple num heater is required with the AH4P series it is placed outside the unit in the discharge ductwork The room thermostat or zone controller calls for either one selectable airflow or one of five airflows from 900 2300 cfm If the VSP option is ordered it is also possible for the thermostat or controller t...

Page 5: ...a distance of 2 ft 0 7 m to facilitate servicing and maintenance Ensure the unit is level to eliminate any pos sible condensate draining issues Horizontal models come equipped with an air filter rack on which all four sides are removable for changing air filter while vertical models come with an air filter rack which can be in stalled with the removable end on either side Be careful not to run pip...

Page 6: ...maining access panel and secure with remaining screws BLOWER IN SIDE DISCHARGE POSITION DEFAULT BLOWER IN BACK DISCHARGE POSITION Plenum Heater Installation When ordering the plenum heater which is ordered as an accessory be sure to specify the type of installation anticipated since the plenum heater models are different for internal or external duct installation 1 AHW series horizontal Plenum hea...

Page 7: ...ct between V C CP Plenum Heater dry contact Connect to C or I in plenum heater 1 Plenum Heater dry contact Connect to 1 and 2 in plenum heater For installations that require the controller to call for multi ple airflows the grey wire jumper from G to an airflow terminal should be disconnected and well insulated to prevent acci dental shorting The controller may then make a dry contact between R an...

Page 8: ...as installed for AH4P series since the duct area will be larger and airflow distribution over the duct cross section will be more uneven an airflow resulting in an air velocity of at least 400 ft min at the elements is required A motor speed output on the terminal RPMOUT is available This is a pulse output with 36 pulses per revolution For exam ple there will be 120 pulses per second at a motor sp...

Page 9: ...overflow of the condensate pan the drain line and trap should be inspected periodically to ensure they are not plugged with accumulated debris See following page for a diagram showing the condensate drain connection Hydronic Loop s AHW Series The connections for the single hydronic loop are 1 brass female NPT They are labelled ZONE IN and ZONE OUT AH4P Series The connections for the heated and chi...

Page 10: ...5 Jul 2022 Page 10 002596MAN 01 ...

Page 11: ...ke a fluid and just like water pressure drop is increased when air is forced to change direction rapidly around a sharp or irregular corner It is recommended that flexible collars be used to connect the main trunks to the air handler This helps prevent any vibra tions from travelling down the ductwork Duct Systems Grill Layout Most forced air heating systems in homes have the floor grills placed a...

Page 12: ...x 17 16 5 x 16 5 22 944 2250 20 10 x 38 12 x 30 14 x 26 16 x 22 18 x 19 18 5 x 18 5 22 1062 2600 20 10 x 38 12 x 30 14 x 26 16 x 22 18 x 19 18 5 x 18 5 24 1227 2900 22 12 x 36 14 x 30 16 x 26 18 x 23 20 x 20 24 1369 3400 22 12 x 36 14 x 30 16 x 26 18 x 23 20 x 20 26 1605 3600 24 14 x 38 16 x 32 18 x 28 20 x 25 22 x 22 26 1699 4300 24 14 x 38 16 x 32 18 x 28 20 x 25 22 x 22 28 2029 5250 26 16 x 38 ...

Page 13: ...nd that full flow is available to the unit 2 Verify that the entire system has been flooded and all the air has been purged as much as possible Further purging may be required after the system has been operating for a while 3 Verify that the loop contains the proper mix of antifreeze for the intended application if applicable Record the type of antifreeze and the mixture value on the startup sheet...

Page 14: ...e cycle fan and zone valve if installed 6 If a plenum heater is installed remove the electrical cover from the plenum heater Place a current clamp meter around one of the supply wires Turn on the power to the plenum heater Adjust the thermostat setpoint to at least 85 F 29 C and observe the current increase to operating level Cooling Mode 1 Ensure the cooling source is operational and the zone sup...

Page 15: ... psi kPa Electrical High voltage connections are correct and securely fastened Circuit breaker or fuse size and wire gauge for air handler A Ga Circuit breaker or fuse size wire gauge and Plenum Heater size A Ga kW Low voltage connections are correct and securely fastened STARTUP DATA Preparation Voltage across L1 and L2 VAC Heating Mode 10 minutes Duct Return Duct Supply and Delta T In Out F C Wa...

Page 16: ...dirt that has gotten by air filter perhaps due to not changing filter at rec ommended interval Clean using cleaning solution or high pressure water or air Hydronic circuit fouling Disconnect the hydronic loop and flush heat ex changer with a calcium removing solution Generally not required for closed loop or cold water open loop systems whenever system performance is reduced for warm water open lo...

Page 17: ...as no display Replace thermostat 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 ...

Page 18: ...nt on ter minal strip For non VSP models measure 24VAC between white black pin 3 and the following at the blower mo tor signal harness insert probes in connector where wire is inserted do not unplug connector 900 cfm grey pin 15 1200 cfm yellow pin 6 1500 cfm yellow black pin14 1900 cfm violet pin 2 2300 cfm green pin 13 For VSP models pull out the signal plug and check for a 0 10VDC signal betwee...

Page 19: ...or emergency pin at the thermostat but no 24VAC signal is present across W2 and C at the air handler s terminal strip Correct wiring No 24VAC signal from C to ground at the plenum heater control board Plenum heater transform er is burned out Voltmeter does not show 24VAC across transformer secondary Replace transformer Plenum heater control board is faulty Transformer tested OK in previous step Re...

Page 20: ...Electrical Specifications Size kW 230 1 60 FLA A MCA A Breaker A Wire Size 5 20 8 26 0 30 10 7 29 2 36 5 40 8 10 41 7 52 1 60 6 15 62 5 78 1 80 4 20 83 3 104 2 100 3 Electrical Specifications Electrical Specifications TABLE 9 Elec Code Power Supply Fan Circulator FLA MCA Max Fuse Breaker Min Wire Size V ø Hz MIN MAX RLA Max A Amps Amps Amps ga AHW 65 0 115 1 60 102 138 12 8 13 0 16 2 20 12 2 1 208...

Page 21: ...8 0 2000 940 9 0 2250 1060 10 0 2500 1180 Likely to be limited to a lower airflow due to 80 oz ft torque limit 2 5 625 300 3 5 875 410 4 5 1125 530 5 5 1375 650 7 5 1875 880 6 5 1625 770 8 5 2125 1000 9 5 2375 1120 May be limited to a lower airflow due to 80 oz ft torque limit Table 11 Airflow 24VAC Control Dry contact from R to this terminal AIRFLOW cfm L s 900cfm 900 425 1200cfm 1200 570 1500cfm...

Page 22: ...apacity kW LAT C LWT C Capacity kW LAT C LWT C Capacity kW LAT C LWT C Capacity kW LAT C LWT C 68 425 0 13 5 21 29 9 27 8 6 94 33 2 30 1 8 72 36 6 32 2 12 38 43 5 36 1 16 17 50 7 39 7 1 2 0 25 7 22 33 7 30 9 9 56 38 1 33 9 11 87 42 5 37 5 16 53 51 3 44 1 21 21 60 2 50 6 5 2 0 38 7 91 35 32 7 10 41 39 7 36 7 12 93 44 5 40 6 17 98 54 1 48 4 23 05 63 7 56 2 11 0 0 50 8 23 35 6 33 8 10 82 40 5 38 2 13...

Page 23: ... 18 400 27 700 32 400 34 600 19 400 30 300 37 100 40 300 20 100 32 300 40 000 45 000 EAT C Airflow L s Water Flow L s EWT 4 C EWT 7 C EWT 10 C Water Pressure Drop kPa Total Capacity kW Sensible Capacity kW LAT C LWT C Total Capacity kW Sensible Capacity kW LAT C LWT C Total Capacity kW LAT C LWT C 27 46 RH 425 0 13 6 8 5 9 15 8 17 3 5 9 5 4 16 7 18 4 4 6 18 1 18 8 1 0 25 9 5 7 4 12 9 13 4 8 2 6 8 ...

Page 24: ... 43 C EWT 49 C EWT 60 F EWT 71 F Capacity kW LAT C LWT C Capacity kW LAT C LWT C Capacity kW LAT C LWT C Capacity kW LAT C LWT C Capacity kW LAT C LWT C 68 425 0 13 5 5 30 4 27 3 7 2 33 7 29 5 9 0 37 1 31 6 12 7 44 0 35 6 16 4 51 1 39 3 2 0 25 7 3 33 9 30 8 9 7 38 3 34 1 12 0 42 7 37 4 16 7 51 7 43 9 21 4 60 6 50 3 7 0 38 8 0 35 2 32 7 10 5 39 9 36 6 13 0 44 7 40 6 18 1 54 4 48 3 23 3 64 1 56 1 14...

Page 25: ...0 38 200 41 100 22 000 34 200 41 600 46 000 EAT C Airflow L s Water Flow L s EWT 4 C EWT 7 C EWT 10 C Water Pressure Drop kPa Total Capacity kW Sensible Capacity kW LAT C LWT C Total Capacity kW Sensible Capacity kW LAT C LWT C Total Capacity kW LAT C LWT C 27 46 RH 425 0 13 7 4 6 2 15 2 18 4 6 4 5 7 16 1 19 4 5 0 17 4 19 4 2 0 25 10 2 7 7 12 3 14 1 8 7 7 0 13 6 15 4 7 2 14 8 16 8 6 0 38 11 9 8 5 ...

Page 26: ...5 Jul 2022 Page 26 002596MAN 01 Wiring Diagram 24VAC Airflow Control ...

Page 27: ...5 Jul 2022 Page 27 002596MAN 01 Wiring Diagram VSP models 0 10VDC Airflow Control ...

Page 28: ...5 Jul 2022 Page 28 002596MAN 01 Dimensions AHW 65 Horizontal Dimensions AHW 65 Vertical ...

Page 29: ...5 Jul 2022 Page 29 002596MAN 01 Dimensions AH4P 65 Horizontal Dimensions AH4P 65 Vertical ...

Page 30: ...AC devices are designed to provide heat only to the completely finished and insulated structure Startup of the unit shall not be scheduled prior to completion of construction and final duct installation for validation of this warranty If a hydronic air handler manufactured by MARITIME GEOTHERMAL LTD fails to conform to this warranty MARITIME GEOTHERMAL LTD s sole and exclusive liability shall be a...

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