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VCCX2 Controller Technical Guide
BIN3 - Hood On/Off Input
When this wet contact input closes (Hood On), the VCCX2
Controller switches from Indoor Air Control to Outdoor Air
Control. This is typically used on CAV applications requiring
CAV/MUA Dual Damper (Hood On/Off) Modes.
BIN4 - Remote Forced Occupied Mode Input
When this wet contact input closes, it will force the VCCX2
Controller into the Occupied Mode. When the Remote Forced
Occupied Signal is removed, the controller will revert to the
Unoccupied Mode of operation if no internal or external schedule
has been configured or is in effect when this occurs.
NOTE:
If Remote Forced operation is used, it must apply
to Cooling, Heating, and Dehumidification. The
unit must be configured for Mode Set By Remote
Contact.
BIN5 - Remote Forced Cooling Mode Input
A wet contact closure on this input is used to provide a means
for another BAS or control device (by others) to force the unit
into Cooling Mode.
BIN6 - Remote Forced Heating Mode Input
A wet contact closure on this input is used to provide a means
for another BAS or control device (by others) to force the unit
into Heating Mode.
BIN7 - Remote Forced Dehumidification Input
A wet contact closure on this input is used to provide a means for
another BAS or control device (by others) to force the VCCX2
Controller into Dehumidification Mode.
BIN8 - Emergency Shutdown Input
This wet contact input is used to initiate shutdown of the HVAC
unit when a normally closed Smoke Detector (by others), Firestat
(by others), or other shutdown condition (by others) contact is
opened. The controller remains active and can initiate alarm
relays.
NOTE:
The binary inputs require wet contacts (24
VAC only) to recognize an active input. If you
provide dry contacts, the contact closure will not
be recognized. All binary inputs are optional.
This means that you must configure the VCCX2
Controller to recognize these input signals.
VCCX2 Controller Outputs
AO1 - Main Supply Fan VFD Control Signal or
Bypass Damper Control Signal
This user-adjustable voltage signal is used to modulate the Supply
Fan VFD in VAV, Single Zone VAV, Filter Loading applications,
or Reverse Acting Building Pressure Control using the VFD. In
a VVT Zoning application, this output would be used to control
a Bypass Damper.
AO2 - Outdoor Air Damper Economizer Control
Signal or Waterside Economizer Valve Signal
Outdoor Air Damper Economizer Control Signal
This user-adjustable voltage signal is used to control the Outdoor
Air Damper during Economizer operation. It is also used to
maintain the Outdoor Air Damper at its minimum position during
Occupied Mode when the Outdoor Air Temperature is not suitable
for Economizer cooling purposes. This minimum position can
be reset based on CO
2
override conditions.
This output is also used to control the Outdoor Air Damper based
on an Outdoor Airflow Setpoint if using an Outdoor Airflow
Monitoring station. This position can be overridden during
Economizer Control.
Finally, this output can be used to control the Outdoor Air Damper
during Reverse Acting Building Pressure Control to maintain a
Building Pressure Setpoint.
Waterside Economizer Valve Signal
This 2-10 VDC signal is used to modulate the Waterside
Economizer valve during Waterside Economizer operation.
AO3 - Modulating Heat Control Signal
This output can be configured with a user-adjustable voltage
range of operation which can be set up to provide either a direct
or reverse acting operation. This output is used to operate a
modulating heating device to maintain the Heating Supply Air
Setpoint during the Heat Mode of operation.
AO4 - Exhaust Fan VFD Signal / Building
Pressure Control Signal
This user-adjustable voltage signal is used to provide Direct
Acting Building Pressure Control using an Exhaust Fan VFD
or a modulating Exhaust Damper.
INPUTS AND OUTPUTS
VCCX2 Controller Outputs
