AAON F-060 - Manual (Page 20)

20
Condensate Piping
A drain trap must be connected to the drain
pan at the unit. Condensate connections are
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. All drain connection ports are sealed.
Knock out only the connection port to be
used. The trap should be located in warm
ambient spaces. An additional drain pan
may be installed under the air handling unit,
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 control
board. The manufacturer has done all wiring
beyond this point. Power can be applied to
the unit after the control wiring is connected,
and startup checks are complete.
Thermostat
Units without the neutral air
dehumidification feature will operate with
most common thermostats. Units with the
neutral air dehumidification feature must use
thermostats with a normally closed (NC)
dehumidification option. The following stats
have been approved for usage with the
dehumidification feature.
Robertshaw Honeywell
9825i2 VisionPRO ® IAQ
Filters
Open filter access bracket and slide correct
filter in with arrow pointing towards the
blower in the direction of airflow.
Replacement filters are 20” x 20” x 1”.
Charging Refrigerant
The unit comes with full charge based on a
25-foot line set. Charging a system in the
field must be based on determination of
liquid sub-cooling and evaporator superheat.
On a system with a thermostatic expansion
valve, liquid sub-cooling is more
representative of the charge than evaporator
superheat but both measurements must be
taken.