CyberOne EC CW IOM Manual
13
CAUTION
An adequate earth ground must be connected to
the unit before operating the unit.
NOTE
All wiring must be provided in accordance with local
and national electrical code requirements.
Verify the main power supply matches the voltage, phase and
frequency specified on the system nameplate. The supply
voltage measured at the unit must be within ±10% of the
voltage specified on the system nameplate.
CAUTION
Do not connect any additional loads to the system
control transformers. Connecting additional loads
to the factory supplied control transformer(s) may
overload the transformer(s).
2.8.1.1
Three-Phase Wiring Connections
CyberOne EC CW units are designed to have the L1, L2 and
L3 supply wires connected to corresponding L1, L2 and L3
line terminals on the non-fused service switch. The unit will
operate correctly if the supply wires are connected in this
manner.
2.8.2
Controls
STULZ offers a wide range of control features to meet
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
terminal may be remotely mounted. A six-conductor cable
is provided for interconnect wiring. Refer to the electrical
drawing supplied with your unit for details on interconnecting
the field wiring.
2.8.3
Optional Equipment
NOTE
All wiring must meet local and national electrical
code requirements.
2.8.3.1
Remote Temperature/Humidity Sensor
The remote temperature/humidity sensor requires a shielded
cable with the shield terminated at the unit electric box. 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 appropriate wire terminations.
2.8.3.2
Remote Water Detector
Each remote water detector used will require two conductors
to be wired to the control terminal board in the unit electric
box. The wire insulation must be rated at 600V. Refer to “2.6.4
Remote Water Detector” on page 10 and see the electrical
drawing supplied with your unit for proper wire terminations.
2.8.4 Humidifier Adjustment
The humidifier has an adjustable capacity potentiometer on
the humidifier control circuit board. The potentiometer may
need to be field adjusted if the humidifier is not supplying
enough capacity for the current room conditions.
It is recommended that if the humidifier capacity
potentiometer requires adjustment, the adjustment is
made in small increments and verified. Refer to the
humidifier manual sent with your unit for the capacity
potentiometer location.
CAUTION
Adjusting the capacity potentiometer too high
may result in the formation of condensate within
the system.
2.9
EC Fan
The speed of the EC fan 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 flow needs adjustment, this may be done using
the controller’s programming menu selections. Refer to the
operator’s manual provided under separate cover for the
system controller. It is recommended that STULZ Product
Support be contacted before making adjustments to the
controller.
