6
Controller User Manual
Wiring Considerations
Consult the supplied wiring diagram for detailed wiring information. All field wiring is indicated by dashed lines on the wiring
diagram.
All wiring in and out of the EVAPCO Controller should be with copper conductors and
wire lengths must be kept as short as
possible
. Consult the detailed wiring diagram for field wiring connections of each device. Applicable electrical codes for the
location should be followed during the sizing and installation of the field wiring.
All fittings attached to the EVAPCO Controller
must be Type 4. All wiring must be through the bottom of the EVAPCO Controller. Top entry into the EVAPCO Controller is
not permitted. Any damage caused to any component within or connected to the EVAPCO Controller due to a top entry
connection is not warrantable!
For wiring the EVAPCO Controller to each NEMA fan motor, Belden
®
VFD cable 295XX (XX denotes gauge) or equivalent should
be used. The shield of the VFD cable needs to be bonded to ground at both ends of the cable.
While the EVAPCO Controller does provide provisions for connection to a BAS, this connection is not required for the EVAPCO
Controller to operate.
Operation and Servicing
On eco-Air units equipped with NEMA fan motor(s), the EVAPCO Controller contains a three position selector switch (Bypass-Off-
Auto) located behind the HMI door. The operation of each position is as follows:
Auto: The
Auto
position allows the EVAPCO Controller to operate the eco-Air unit based on the logic programmed into the
Controller. Note that the unit must be switched on before the eco-Air unit will begin to operate. Please see the
On/Off Unit
Screen
section of this document for more information.
Off: In the
Off
position, the EVAPCO Controller will be powered; however, output commands will not be sent to any of the
attached equipment. This position is used for programming the VFD.
Bypass: In the
Bypass
position, the logic program is bypassed which allows the fan motor(s) to energize independent of
sensor temperature or setpoints. Power is routed around the VFD and thus the fan motor(s) will operate at full power, across-
the-line. The VFD will still be energized when the selector switch is in the Bypass position.
The door protecting the HMI must be shut unless an operator is using the HMI interface. This will protect the HMI interface from
contamination and increase the life of the HMI.
The EVAPCO Controller is supplied with air filters that must be inspected every 90 days. Depending on the installation
environment, more frequent inspection and/or replacement may be required. A dirty filter can cause the internal panel temperature
to increase and may cause component failure. Permanently removing the filter will allow dirt and particulates to enter the enclosure
and may cause premature failure.
Please consult the proper Operation and Maintenance Instructions for start-up and maintenance guides for the eco-Air unit
attached to the EVAPCO Controller.