Orion System VCC-X Controller - Manual (Page 52)

Zone
Zone
INPUTS & OUTPUTS
VCC-X Controller Technical Guide 52
VCC-X Controller Inputs & Outputs
BIN1 - Proof of Flow Input
A Proof of Flow Switch (by others) that provides a wet contact
closure whenever the HVAC unit Supply Fan is operating can be
connected to this input. If the Proof of Flow Switch contact opens
while the Supply Fan is operating, all Heating and Cooling is
suspended or disabled.
BIN2 - Dirty Filter Contact Closure Input
This wet contact input is required for Filter Status Indication and
requires a Differential Pressure Switch to initiate a Dirty Filter alarm.
BIN3 - Hood On/Off Input
When this wet contact input closes (Hood On), the VCC-X 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 VCC-X
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 confi gured or is in effect when this occurs.
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 Dehumidifi cation 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 VCC-X
Controller into Dehumidifi cation Mode.
BIN8 - Emergency Shutdown Input
This wet contact input is used to initiate shutdown of the HVAC
unit when a N.C. 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 confi gure the VCC-X Controller to recognize
these input signals.
VCC-X Controller Outputs
AOUT1 - Main Supply Fan VFD Control Signal
This user-adjustable voltage signal is used to modulate the Supply
Fan VFD in VAV, Single Zone VAV, or Filter Loading applications.
AOUT2 - Economizer (Outdoor Air Damper)
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 the
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 Air Flow Setpoint if using an Outdoor Airfl ow 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.
AOUT3 - Modulating Heat Control Signal
This output can be confi gured 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.
AOUT4 - 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.
NOTE: For Reverse Acting Building Pressure Control us-
ing the Outdoor Air Damper or Supply Fan VFD,
the VCC-X Controller will use the outputs specifi c
to those devices. On the main VCC-X Controller,
AOUT2 would control the Outdoor Air Damper and
AOUT4 would control the Supply Fan VFD to main-
tain the Building Pressure Setpoint.
R1 - Supply Fan (Enable)
This is a non-confi gurable output.
R2-R8 - User-Confi gurable Relays
These relays are confi gurable by the user. For all the available
confi guration options, see Table 5.