Installation Manual

Hydronic Air Handler Installaon and Operaon Manual 21
• Install ductwork in accordance with NFPA
90B and any local codes.
• Install the conditioned air plenum, ducts
and air filters (not provided) in accordance
with NFPA 90B Standard for the
installation of Warm Air Heating and Air-
Conditioning Systems (latest edition).
• Isolation connectors (if utilized) must be
nonflammable.
• Duct connections for the air handler with
hot water heat must allow room for water
piping connections to be made in the
upflow configuration.
• A return air duct system is recommended.
If the unit is installed in a confined space or
closet, a return connection must be run, full
size, to a location outside the closet.
• The air handler is provided with flanges for
the connection of the plenum and ducts.
• Air filters must be listed as Class 2 furnace
air filters.
• Supply and return ductwork must be
adequately sized to meet the system’s air
requirements and static pressure
capabilities. Ductwork should be insulated
with a minimum of 1 in. (25 mm) thick
insulation with a vapor barrier in
conditioned areas or 2 in. (51 mm)
minimum in unconditioned areas.
• Supply plenum should be the same size as
the flanged opening provided around the
blower outlet and should extend ideally at
least 3 ft. (1 m) from the air handler before
turning or branching off plenum into duct
runs. The plenum forms an extension of
the blower housing and minimizes air
expansion losses from the blower.
• All wiring must conform to local and national
electrical codes. Improper wiring or
installation may damage thermostat.
• Air Conditioner Model: The Standard Model
A/C thermostat may be wired with or without
connecting a common wire between the
indoor equipment and the thermostat.
However, it is recommended to use a
common wire whenever possible to prevent
power stealing by the thermostat.
• Heat Pump Model: The standard model
heat pump thermostat is not "power
stealing" and must have both ‘R’ and ‘C’
wires connected to operate properly. The
thermostat should have an indicator for
when auxiliary heat is in use.
• The thermostat should NOT be mounted:
− Close to a window, on an outside wall,
or next to a door leading to the outside
− Exposed to direct light and heat from a
lamp, sun, fireplace, or other heat-
radiating objects which may cause a
false reading
− Close to or in direct airflow from supply
registers and return-air grilles
− In areas with poor air circulation, such
as behind a door or in an alcove
Before installing or servicing the air handler,
turn off power to unit. There may be more
than one disconnect switch. Electrical shock
can cause personal injury or death.
WARNING