24 11.8.22 © STULZ USA – all rights reserved
CYBERWALL™ INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Dirty Filter Switch
A Dirty Filter switch is available with this unit. The switch contacts provided are Normally Open (N.O.) when the
unit is operating. The switch contacts actuate closed when the differential pressure across the corresponding
air filter has reached a predetermined value, indicating that the filter should be replaced. The system
controller signals a designated dry contact to close indicating which filter needs replacement. Refer to the
electrical drawing provided with your unit.
Smoke Detector
Optionally mounted in the return air stream, a photo-electric smoke detector is used to sense the presence
of smoke and signal the controller when a smoke alarm condition exists. The unit is allowed to continue to run
when a smoke alarm condition exists.
Firestat
The CyberWall™ system is available with an optional firestat mounted in the rear return air stream. The firestat
will sense high return air temperature and signal the controller when a potential fire alarm condition exists.
Harmonic Mitigation Filter
The CyberWall™ system is available with an optional harmonic mitigation filter. This filter is factory installed
and wired. It is a passive type filter to meet the limits of IEEE standard 519. The filter incorporates a unique
inductor combined with a small capacitor bank to achieve a reduction of all major harmonic currents and does
not require any service throughout the equipment life.
System Settings and Adjustments
Chilled Water Circuit
In a chilled water A/C unit, cooling is maintained by the flow of chilled fluid through a cooling coil. A control
valve proportionally opens to increase the flow as the temperature rises (or closes as the temperature falls).
If the unit is turned off using the normal shut down procedure with the system controller, the valve will return
to the closed position, shutting off flow through the coil. Refer to the piping drawing supplied with your unit to
determine which type valve is provided.
The chilled water valves are factory set for the correct operating position and should not require field
adjustment.
Fan Speed Control
There are two options available for controlling the fan speed - Temperature Control and Static Pressure
Control.
Temperature Control
For the temperature control option, the fan speed will be controlled via PID, based on input from the
connected temperature sensors. The controller will modulate the fan speed according to the difference
between the setpoint and the current control temperature. The sensor is user selectable between the return
or supply air temperature. There are three user-selectable fan speed settings to provide an operating range
for the fans – Min Speed, Max Speed, and Dehumidification Speed. Dehumidification Speed only can only be
used if the control sensor is set to Return Temperature and Humidity sensor. If the humidity sensor fails in the
unit, then the value will go to 0% RH, and the unit will not allow dehumidification.
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