CyberOne EC DX IOM Manual
2.7.1.4
Three-Phase Units
Three-phase units are designed to have the L1, L2 and L3
supply wires connected to corresponding L1, L2 and L3
line terminals of the non-fused service switch. The unit will
operate correctly if the supply wires are connected in this
manner.
CAUTION
Improper wire connections will result in the reverse
rotation of the fans/blower motors and compressor
and may eventually result in damage to the compressor.
To correct this problem, exchange any two of the
incoming main power wires at the main power service
disconnect switch. Do NOT rewire the unit’s individual
components.
2.7.2
Controls
STULZ offers a wide range of control features to solve
your air conditioning control/alarm requirements. If the
system controller is mounted on the unit (standard), no utility
connection is required. As an option, the E²
controller display
may be remote mounted. A six-conductor cable is provided for
interconnect wiring. Refer to the electrical drawing supplied
with your unit and Figure 13 thru Figure 15 for details on
interconnecting the field wiring.
2.7.3
Optional Equipment
NOTE
All wiring must be provided in accordance with local
and national electrical code requirements.
2.7.3.1
Remote Temperature/Humidity Sensor
The remote temperature/humidity sensor requires a shielded
cable with the shield being terminated at the unit electric
box. The number of conductors needed depends on which
system controller is utilized. For systems utilizing the model
E²
controller, three control conductors are required. Both the
electric box and the sensor include a terminal strip with box
type lugs for wire connections. Refer to the electrical drawing
supplied with your unit for the number of conductors required
and for the appropriate wire terminations.
2.7.3.2
Remote Water Detector
Each remote water detector used will require two
conductors to be wired to the control terminal board within
the unit electrical box. The wire insulation must be rated at
600V. Refer to Section 2.5.5 and see the electrical
drawing supplied with your unit for proper wire
terminations.
2.7.4
Air-Cooled Split Systems
The following system interconnecting field wiring diagrams
detail the number of conductors required for a typical system.
Additional control conductors may be required depending
on the options purchased with the equipment. Refer to the
electrical drawing supplied with your unit 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 each system.
For systems equipped with a remote condenser, or remote
condensing unit the installer must provide main power
wiring to the main power distribution block located within
Figure 12. Transformer Schematic
18
