9CLCH-SVX02C-EN
Wiring
CAUTION
Do Not Install VFDs
Do not install a variable-frequency
drives (VFDs) to control the energy
wheel speed. This may result in
failure of the energy wheel motor.
CAUTION
Factory-Installed Wiring
Take care when penetrating the unit
casing. Factory wiring may be routed
in the side panels of the module.
(See Figure 6). They will be labeled.
Energy Wheel Motor
Refer to Table 3 for the energy wheel
voltage and amperage requirements.
Refer to the factory sales order to
determine the energy wheel size.
If not factory-installed, the electrical
contractor must penetrate the unit
casing, provide and install a starter
or starting contactor, disconnect,
fuses, etc., as required by local
codes, for the energy wheel motor.
Do not install a variable frequency
drive (VFD) to control the energy
wheel speed. This may result in
failure of the energy wheel motor.
Figure 6. Energy wheel modules
may have factory-installed ribbon
cables attached inside. Take care
when penetrating the unit casing.
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.
Optional Exhaust Air
Pressure Differential
Switch
If not factory-installed, connection to
the exhaust air pressure differential
switch must be made inside the
module. This is a double-pole,
Table 3. Energy wheel voltage and amperage requirements
Wheel Size
(nominal cfm)
Motor
hp Motor voltage/phase Motor Hz
Motor
Amperage
900, 1500 n/a 208-230 volt, single-phase 50/60 0.3
3,000-5,000
¹⁄₆
hp 200/208-230 volt, single-phase 50/60 1.2
3,000-5,000
¹⁄₆
hp 200-230 volt, three-phase 60 0.80-0.75
3,000-5,000
¹⁄₆
hp 460 volt, three-phase 60 0.38
3,000-5,000
¹⁄₆
hp 575 volt, three-phase 60 0.3
6,000–15,000
¹⁄₄
hp 200-230 volt, three-phase 60 2.3-2.5
6,000–15,000
¹⁄₄
hp 460 volt, three-phase 60 1.2
6,000–15,000
¹⁄
3hp 575 volt, three-phase 60 1.4
17,500–25,000
¹⁄
3
hp 200-230 volt, three-phase 60 3.4
17,500–25,000
¹⁄
3
hp 460 volt, three-phase 60 1.7
17,500–25,000
¹⁄
3hp 575 volt, three-phase 60 1.4
single-throw (DPST) switch with a
normally open and normally closed
contact. Both poles are rated at 120v,
1/6 hp. This wiring should be sized
and installed as required per national
and local electrical codes.
Optional Dirty Filter Switch
If not factory-installed, connection to
the dirty filter switch must be made
inside the module. This is a double-
pole, single-throw (DPST) switch
with a normally open and normally
closed contact. Both poles are rated
at 120v, 1/6 hp. This wiring should be
sized and installed as required per
national and local electrical codes.
Optional Exhaust Air Frost
Control Temperature
Sensor
If not factory-installed, connection to
the exhaust air frost control
temperature sensor must be made
inside the module. The sensor is a
thermistor with a nominal resistance
of 1,000 ohm at 70 degrees F (21
degrees C) and a linear resistance
curve. This wiring should be sized
and installed as required per national
and local electrical codes.
