(Mar, 2012)
Compact CWE Series Installation, Operation & Maintenance Manual
Air Technology Systems, Inc.
2.8.3 Optional Equipment
Additional control conductors may be required
depending on the options purchased with the
equipment. Refer to the electrical diagram supplied
with your unit to determine the total number of
interconnecting conductors required for your system.
It is important to note that control transformer(s)
supplied with the equipment are sized and selected
based upon the expected loads for each system.
CAUTION
Do not connect any additional loads to the
system control transformers. Connecting
additional loads to the factory supplied control
transformer may result in overloading of the
transformer.
2.8.3.1 Remote Temperature/Humidity Sensor
Field installed remote temperature/humidity sensors
require a three conductor shielded cable, with the
shield terminated at the unit electric box. Both the
electric box and the sensor are provided with a
terminal strip for the wire connections. Refer to the
electrical schematic supplied with your unit for proper
wire terminations.
2.8.3.2 Remote Water Detector
Each remote water detector requires two conduc-
tors to be wired to the control terminal board within
the unit electrical box (see Figure 18). If customer
furnished, the wire insulation must be rated at 600V.
Refer to the electrical schematic supplied with your
unit for proper wire terminations.
2.9 System Settings and Adjustments
2.9.1 Chilled Water Circuit
In a chilled water A/C unit, cooling is maintained
by the fl ow of chilled water through a cooling coil.
A water valve proportionally opens to increase the
fl ow as the temperature rises (or closes as the
temperature falls). If the unit is turned off, the valve
will return to the closed position shutting off fl ow
through the coil. Chilled Water control valves are
available in 2-way or 3-way confi gurations. Refer
to the piping drawing supplied with your unit to
determine which type valve is provided.
Location and size of chilled water valves differs with
the size of the A/C unit. The chilled water valves
are factory set for the correct operating position and
should not require fi eld adjustment.
2.9.2 EC Fan(s)
The speed of the EC fans is controlled via a 0 to
10 VDC signal from the system controller. The
controller is set by the factory and should not require
adjustment. If it is determined that the air fl ow needs
adjustment, this may be done using the controller’s
programming menu selections. Refer to the IOM
manual provided under separate cover for the system
controller. It is recommended that SATS Product
Support be contacted before making adjustments to
the controller.
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