CyberAiR DX Floor Mounted IOM Manual
1.5.2
Condensate Pump
An optional condensate pump may be factory
installed. The pump automatically eliminates
condensate and humidifier flush water (if applicable)
from the drain pan. An internal overflow safety switch
is wired to the system controller to automatically signal
an alarm should an overflow occur.
1.5.3
Water Detector
As an option, STULZ offers spot type or strip/cable
type water detectors (see Section 2.6.5). Upon
sensing a leak, the water detector control circuit will
signal the system controller of the alarm condition.
1.5.4 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 system controller
is programmed to shut down the compressor and the
fans when smoke is detected. When the alarm
condition is cleared, a manual re-set is required by
cycling the main power service disconnect switch off
and on.
1.5.5
Firestat
Optionally mounted in the return air stream, a fire
detector senses high return air temperature and
signals the controller when a fire alarm condition
exists. The system controller is programmed to shut
down the compressor and the fans when fire is
detected. When the alarm condition is cleared, the
reset button on the firestat must be manually pressed
to resume operation.
NOTE
The smoke detector and firestat are not
designed to operate as room smoke/fire
detection systems that may be required by
local or national codes.
1.5.6
Auto Power Transfer Switching
An automatic transfer, main power switching
system is optionally available for critical operations.
With this option, two main power service
disconnect switches
are provided on the door of the cabinet to connect
two independent power sources (see Figure 3).
Figure 3- Auto Transfer Disconnect Switches
If the user selectable main power source is
interrupted or, if a phase loss or imbalance occurs,
the automatic transfer switching circuitry
immediately transfers operation of the precision A/C
system to a secondary power source. If power is
transferred, the system controller provides an alarm
signal and the alarm display indicates which power
source failed. When the primary power source is
functionally restored,
the operation of the A/C system is automatically
transferred back to the primary power source.
An indicator light is provided above each main power
service disconnect switch (see Figure 3). A light
illuminates above the switch that’s selected to supply
power to the A/C system, whether the unit is running
or not, indicating that power is available at the
switch.
A preferred power selector switch is included with
the auto-transfer switching option. It is mounted
inside the cabinet at the top of the electric box (see
Figure 16). This switch may be used to manually
transfer the power source and/or test the auto
transfer switching function.
1.6 Dual Cooling Circuits
STULZ CyberAir DX systems are designed with two
stages of cooling. The cooling circuits are typically
comprised of one compressor per circuit. The circuits
are staged to operate as needed, based on
incremental cooling stage enable temperature set
points as programmed in the system controller. Each
stage is assigned an offset to the temperature set
point for turning the compressors on. The controller
turns each stage on and off as needed based on the
temperature set point plus offset value (reference
Section 4.5.1.2
in the
E²
Series Controller Manual). The
compressor circuits rotate after each run cycle in
an effort to promote equal run-times.
1-8
