AAON V3-E - Manual (Page 14)

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Heating Equipment
When heat is called for, the cooling section is
inoperable except for the indoor blower motor. Actual
heating is accomplished by the air handling unit with
hot water, steam or electric heating capabilities.
Air Handler Equipped with Hot Water Coil
Water supply lines must be insulated, properly
fastened, drained and supported according to local
code requirements.
Air Handler Equipped with Steam Coils
The air handling unit MUST BE installed high enough
to allow for a minimum of one foot (1’) condensate
drop leg off of the steam coil (or as recommended by
the steam trap manufacturer). Lines should be
insulated with approved insulation and be properly
fastened, sloped and supported according to local
code requirements.
Air Handler Equipped with Electric Heating
INSTALLATION IS TO BE ADJUSTED TO OBTAIN
AN AIR TEMPERATURE RISE WITHIN THE RANGE
SPECIFIED ON THE RATING PLATE.
Heating is accomplished by passing electrical current
through a specified amount of resistance heaters
which will produce the required heat. The indoor
blower motor will energize at the same time as the
heaters. Wiring to the air handler must be done in
accordance with local electrical codes and/or
standards. Check specified electrical rating and install
with proper wire size.
Condensate Piping
If the air handler is equipped with cooling, a drain trap
must be connected to the drain pan at the unit. A
condensate connection is provided on each side of the
unit. Condensate piping should be installed according
to local codes. The line should be the same pipe size
as the drain nipple and should pitch downward toward
the building drain.
All cooling coils must have drain pans equipped with
“P” traps to avoid pulling air from outside the unit back
through the drain line. A plug is provided for the
unused condensate connection. The trap should be
located in warm ambient spaces. An additional drain
pan may be installed under the air handler, and should
include a separate drain line for overflow from the
primary drain. An air break should be used with long
runs of condensate lines.
Drain pans in any air conditioning equipment, even
when they have a built-in slope to the drain, will have
moisture present and will require periodic cleaning to
prevent any build-up of algae or bacteria. Cleaning of
the drain pans will also prevent any possible plugging
of the drain lines, and overflow of the pan itself. Some
means to clean out the “P” trap should be provided.
Only qualified personnel should clean drain pans,
drain lines, or the insides of equipment.
Electrical
Check the unit data plate to make sure it agrees with
the power supply. Connect power to the unit
according to the wiring diagram provided with the unit.
The power and control wiring may be brought in
through the holes provided on the unit. Protect the
branch circuit in accordance with code requirements.
If the control wires are to run inside the same conduit,
use 600-volt wire or as required by applicable codes.
The units must be electrically grounded in accordance
with the National Electric Code, ANSI / UL 1995 when
installed if an external source is utilized; in Canada
use current C.S.A. Standard C22.2, No. 236,
Canadian Electric Code Part 1.
Power wiring is to the unit terminal block. The
manufacturer has done all wiring beyond this point.
Power can be applied to the unit after the control
wiring is connected, and start up checks are complete.
Thermostat
The low voltage room thermostat should be located on
an inside wall 4 to 5 feet a above the floor where it will
not be subjected to drafts, sun exposure or heat from
electrical fixtures or appliances. Control wire size
must be large enough to prevent excess voltage drop
that may cause improper operation of the equipment.
Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure.
Filters
Open filter access door and slide correct filter in with
arrow pointing towards the blower in the direction of
airflow.
For filter sizes see back cover.