CyberAiR DX Floor Mounted IOM Manual
2.8.2
Optional Equipment
Additional control conductors may be required
depending on the options purchased with the
equipment. Refer to the supplied electrical
schematic to determine the total number of
interconnecting conductors required for your
system. It is important to note that the control
transformer(s) supplied with the equipment have
been sized and selected based upon the expected
loads for the system.
CAUTION
Do not connect any additional loads to the
system control transformers. Connecting
additional loads to the factory supplied control
transformers may result in overloading of the
transformer.
NOTE
All control wiring must be provided in
accordance with local and national electrical
code requirements for class 2 circuits.
NOTE
Do not route control conductors together with
power conductors.
2.8.2.1 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.
2.8.2.2 Remote Water Detector
Each remote water detector requires two conductors
to be wired to the control terminal board within the
unit electrical box (see Figure 14). If customer
furnished,
the wire insulation must be rated at 600V. Refer to
the electrical schematic supplied with your unit for
proper wire terminations.
2.8.2.3 Remote Shut Down
The unit is provided with a means to remotely shut
down the air conditioning unit. A normally closed
switch rated at 5 amperes at 24VAC is required for
this purpose. Two conductors from the normally
closed switch must be connected to the control
terminal board located in the electric box. Refer to
the supplied electrical drawing for the appropriate
wire terminations.
2.8.3
Interconnecting Remote Equipment
2.8.3.1 Water Cooled Systems
(CFD/CFU-_ _ _-D2W
Models)
Systems equipped with an internal water cooled
condenser do not require field wiring to external
components other than to optional sensors as
selected (e.g. Flow Sensors, Remote Supply Air T/H
sensor, Air Pressure, Customer Alarm Inputs).
2.8.3.2 Glycol Cooled Systems
(CFD/CFU-_ _ _-D2G Models)
For systems equipped with a glycol-cooled system/
pump package, the installer must provide main
power wiring to the main power distribution block
located in the pump package and the drycooler
control boxes. The drycooler and pump package
may each be connected directly to main power
(separate connections), or the drycooler may be
interconnected to main power in the pump package
control box as shown in Figure 17 (single-point
connection). A separate equipment ground lug is
provided within each box for termination of the
earth ground wire. The installer must also wire two
control conductors from the control terminal board
within the A/C unit to the pump package electrical
box. Refer to the supplied electrical drawing for
proper wire terminations.
2.8.3.3 Air Cooled Split Systems With Remote
Condenser (CFD/CFU-_ _ _-D2A Models)
See Figure 18. For systems equipped with a remote
condenser, the installer must provide main power
wiring to the main power distribution block located
within the remote condenser control box. A separate
equipment ground lug is provided within the
electrical box for termination of the earth ground
wire. Refer to the electrical drawing supplied with
your unit and the wiring diagram supplied with the
condenser (typically located in the condenser
electric box).
As an option, control wiring may be installed
between the A/C system and the condenser for the
system controller to enable condenser operation only
when the compressor is running. You must remove
the jumper from the remote condenser terminal
board (see the condenser wiring diagram). Wire 24
VAC control conductors from the terminal board
within the A/C unit to the remote condenser terminal
board. If control wires aren’t installed (and the
jumper remains in place), the condenser is always
enabled and will turn on and off based on the
condenser’s pressure control settings. Refer to the
electrical drawing for the correct number of field
wires needed and for the appropriate wire
terminations required specifically for your system.
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