AAON CL-230 - Manual (Page 9)

9
INSTALLATION cont.
During higher ambient temperatures the entire
condenser is required to condense refrigerant.
During these higher ambient temperatures, a
receiver tank is used to contain the refrigerant
that was required to flood the condenser during
low ambient operation. The receiver must be
sized to contain all of the flooded volume
otherwise there will be high head pressures
during higher ambient conditions.
Electrical:
• The single point electrical power connections
are made in the electrical control compartment.
• Check the unit data plate voltage 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
up through the utility entry. Protect the branch
circuit in accordance with code requirements.
Control wires and power should not be run inside
the same conduit. The unit must be electrically
grounded in accordance with the current National
Electric Code.
• Power wiring is to the unit terminal block or
main disconnect. All wiring beyond this point
has been done by the manufacturer and cannot be
modified without effecting the unit's
agency/safety certification.
Note: Startup technician must check motor
amperage to ensure that the amperage listed
on the motor nameplate is not exceeded.
Refrigerant Piping Connections
• CL condensing unit refrigerant piping
connections are located in the upper corner of the
service vestibule side of the unit (opposite the
condenser section) as shown in the figure.
• The piping connections are protected with a
shipping cover that must be removed prior to
copper connection and installation.
Evaporative-cooled Condenser Field Piping
Connections:
• There are two field water connections that must
be made for the evaporative-cooled condenser.
There is a ¾” PVC socket city make-up water
connection and a 2” PVC socket drain
connection (as shown on the next page). This
drain should connect to a sanitary sewer or other
code permitted drain. These connections can go
through the base or the wall of the unit.
• There is a cutout in the base with a cap that is
1” tall and the cap is sealed to the unit base to
prevent any leaks in the unit from penetrating
into the building. Any piping through the base
should go through a field cutout in this cap. The
pipes must be sealed to the cap once the piping is
complete to prevent any leaks in the unit from
penetrating into the building.
• A field cutout must be made in the wall if the
evaporative-cooled condenser piping is to go
through the unit wall. This cutout must be
sealed once the piping is installed to prevent
water from leaking into the unit.