Nordic AH4P Series, Service Manual

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5-Jul-2022 Page 5 002596MAN-01
Installation Basics
Sample Bill of Materials
FROM MARITIME GEOTHERMAL
• AHW/AH4P SERIES AIR HANDLER
• PLENUM HEATER __kW
• P/T PORTS AND HOSE ADAPTERS (2)
DUCTWORK
• OUTLET PLENUM ADAPTER W/ FLEXIBLE COLLAR
• RETURN AIR ADAPTER W/ FLEXIBLE COLLAR
• TRUNK DUCT W/ JOINERS
• 6” ROUND DUCT W/ADAPTERS
• ALUMINUM TAPE
• SHEET METAL SCREWS
PIPING
• PIPE (HYDRONIC LOOP & CONDENSATE DRAIN)
• PIPE FITTINGS
• ZONE VALVE or ZONE PUMP
• ANTIFREEZE (IF USED)
ELECTRICAL
• THERMOSTAT OR CONTROLLER
• SERVICE WIRE: 14-2 OR 12-2
• PLENUM HEATER SERVICE WIRE
• BREAKER
• PLENUM HEATER BREAKER
• THERMOSTAT WIRE 18-4 (OR 18-8 FOR MULTISPEED)
• THERMOSTAT WIRE 18-2 (PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE (10)
• CONDENSATE PUMP & HOSE (IF REQUIRED)
Unpacking the Unit
When the air handler reaches the site it should be
unpacked to determine if any damage has occurred during
shipment. Any visible damage should be noted on the carrier's
freight bill and a suitable claim filed at once.
The unit is well constructed and every effort has been
made to ensure that it arrives intact; but it is in the customer's
best interest to check the unit thoroughly when it arrives.
Unit Placement
Ducted air units should be centrally located in the building
with respect to the conditioned space. A heating, cooling, or
dehumidification system cannot be expected to produce have an
even effect throughout the building when it is located at one end
of the structure and the air is transmitted a long distance with
uninsulated metal ductwork.
The front (piping side) access panel should remain clear of
obstruction for 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 piping in front of the filter rack access cover.
Note that since AHW units require an external condensate
trap (see Piping chapter), they can not easily be floor mounted.
They will instead need to be hung or placed on a low stand at
least 5.5” (14 cm) higher than the floor.
Horizontal units may be hung using threaded rod and an-
gle or channel iron bars underneath. Be sure the hanging sys-
tem is suitable for 2X the weight of the unit.
AHW: Air Return & Outlet Orientation
On all 2-pipe air handler models, the air return and outlet
are in a fixed orientation in relation to to ‘front’ of the unit (the
side where water pipes are located).
For horizontal 2-pipe models, the air returns to the back
side and is discharged to the right.
For vertical 2-pipe models, the air returns to the back side
and is discharged upwards.
See Dimensions section at the end of this manual.
AH4P: Air Return & Outlet Orientation
On all 4-pipe air handler models, the air return and outlet
are in a fixed orientation in relation to to ‘front’ of the unit (the
side where water pipes are located).
For horizontal 4-pipe models, the air returns on the
left.
The blower position is field convertible in order to discharge air
to either the
right side
(default position) or
back
.
For vertical 4-pipe models, the air returns on the
left
side
and is discharged upwards.
See Dimensions section at the end of this manual.