8
CDQ-SVX01A-EN
Wiring
CAUTION
Do Not Install VFDs!
Do not install a variable-frequency
drives (VFDs) to control wheel
speed. This may result in failure of
the wheel motor.
CAUTION
Factory-Installed Wiring!
Use caution when penetrating unit
casing. Factory wiring may be routed
in the side panels of the module.
Misplaced penetrations may result in
damage to the wiring.
CAUTION
Penetration Leaks!
Properly seal all penetrations in unit
casing. Failure to seal penetrations
from inner panel to outer panel may
result in unconditioned air entering
the module, and water infiltrating
the insulation, resulting in
equipment damage.
Figure 1. CDQ wheel modules may have
factory-installed ribbon cables
attached inside. Take care when
penetrating the unit casing. Modules
will be labeled.
CDQ™ Desiccant
Wheel Cassette
Motor Data
If not factory-installed, the electrical
contractor must provide and install a
starter or starting contactor,
disconnect, fuses, etc., as required
by local codes, for the CDQ wheel
motor. Do not install a variable
frequency drive (VFD) to control the
desiccant wheel speed. This may
result in failure of the wheel motor.
The motor requires air movement for
continuous operation. Operating the
wheel for long periods with the fan
off may result in motor failure.
Table 1. Motor Data
Wheel Size
(nominal cfm)
HP
Voltage/
phase
HZ
Full Load
Amps
Rotation
RPM
Rotation
Direction
500-5000
1/80
115 Volt
Single Phase
60
0.3
2.30
CW/CCW*
6000-40,000
1/80
115 Volt
Single Phase
60
0.3
4.50
CW/CCW*
*Motors are wired for counter clockwise rotation
Figure 2. Motor wiring
5000C1 wheels and below
<
48in diameter
6000C1 wheels and above
>54in diameter
Optional Damper Actuators
Each actuator requires 24 Vac supply
power and wiring for the 2–10 Vdc
control signal. This wiring should be
sized and installed as required per
national and local electrical codes.
Optional Air Temperature
Sensors
If not factory-wired, connection to
the air temperature sensors is made
by penetrating through the side of
the module wall and making
electrical connections to the
temperature sensor. Nominal
resistance of these sensors is 1,000
ohms at 32 degrees F (0 degrees C).
The sensor is a thermistor with a
platinum 375 resistance curve. This
wiring should be sized and installed
as required per national and local
electrical codes.
