Specifications

8
Installation (continued)
Power Connection
The AFX unit uses three phase power for
operation. Bring the service cable through the
3/4" bulk head hole near the electric box and
connect it to the power distribution block pro-
vided on the left side of the electric box. All
wiring must be done in accordance with local
and national electric codes.
Utility Connections
All connections are made through the side of the
mechanical section of the air conditioner for
ease of service connection.
Grounding
A ground lug is located next to the high voltage
connection. It must be used.
Condensate Drain Connection
Condensation from the evaporator pan and the
discharge from the optional humidifier system
drains through a drain in the side of the unit.
The installing agency should provide a P-trap
and the piping for this zero drain with slope to
allow for free drainage.
Optional Humidifier Connection
The humidifier inlet connection is in the bottom
mechanical section. A 1/4" compression
connection is supplied with the unit.
Water Supply to Humidifier Connection
1. The humidifier fill valve(s) orifice is sized for
supply water pressure from 30 to 85 psig.
2. For water pressure between 15 and 30 psig,
notify the factory and a larger fill valve will
be supplied.
3. For installation with less than 15 psig, notify
the factory and a fill valve with a specially
4. For applications above 85 psig, install a
pressure-reducing valve in the water feed
line to the unit.
5. With extremely dirty or muddy water
sources, proper filtration is required on the
unit's entering water line.
6. DO NOT use softened water with the
humidifier because it is too conductive.
7. DO NOT use completely demineralized
water with the humidifier. Minerals allow the
electrode principle to work.
8. DO NOT use a hot water source. It will
cause deposits to eventually block the fill
valve orifice.
9. Water supplies with high conductivity (above
700 microhms) must be preconditioned for
proper humidifier operation and longevity.
10. Consult the Humidifier Operation &
Maintenance Manual included with this AFX
unit for more in-depth information and
troubleshooting procedures.
Outdoor Heat Exchanger Installation
The Outdoor Heat Exchanger (OHE) should be
located in a high security area. Consideration
must be given to ensure a minimum of 24”
clearance from any adjacent wall. The area
should be clear of paper and debris that might
be drawn into the coil.
Be aware of air movements that may cause
short-circuiting of the entering and leaving
condenser air.
The OHE must be mounted on a level surface
with sufficient support to carry the unit’s weight
when fully charged. The heat exchanger has
mounting holes to permit the unit to be bolted
down to prevent shifting. Consult the OHE
Installation Manual for proper set-up.
Before operating, all OHEs should be checked
as follows:
1. Check set screws on all fan hubs.
2. Ensure that fans turn freely and that the
blades are not distorted.
3. Ensure that fans rotate in the proper
direction.
The installing agency should provide a main
power disconnect to isolate the OHE during
routine service or an emergency. Consult the
OHE electrical data table for specific electrical
information