Zone
Zone
INPUTS & OUTPUTS
VCB-X Controller Field Technical Guide
58
VCB-X Controller Outputs
VCB-X Controller Outputs
AOUT1 - 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 Air
fl
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 con
fi
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.
TR1 - Digital Compressor Unloader
The unloader solenoid is energized in an on/off pattern to deliver
the capacity needed by (1) digital compressor to achieve setpoint.
R1 - Supply Fan (Enable)
This is a non-con
fi
gurable output.
R2-R6 - User-Confi gurable Relays
These relays are con
fi
gurable by the user. For all the available
con
fi
guration options, see
Table 5
.
No. Relay Description
Details
1
Digital Compressor
Confi gured for a Digital Compressor.
2
Cooling Stage
Confi gured for each fi xed stage of cooling (except heat pump compressor).
3
Condenser
Confi gured for Condenser Fan or Condenser Water Valve operation. This relay will be active anytime
a compressor is active, except if this is an air to air heat pump in the Heat Pump Defrost Mode.
4
Heating Stage
Confi gured for each fi xed stage of heating.
5
Heat Pump Compressor
Confi gured for a Fixed Heat Pump Compressor stage.
6
Reversing Valve
Confi gured for the Reversing Valve of a heat pump unit.
7
Aux Heat
Confi gured for a fi xed stage of Aux Heat in a heat pump unit.
8
Emergency Heat
Confi gured for a fi xed stage Emergency Heat in a heat pump unit.
9
Mod Heat Enable
Confi gure if a 0-10 VDC Modulating Heat source needs a relay to enable it.
10
Mod Cool Enable
Confi gure if a 0-10 VDC Modulating Cool source needs a relay to enable it.
11
Pre-Heat
Confi gure this relay for Pre-Heat operation. See Pre-Heat Sequence for details.
12
Low Ambient
Confi gure this relay for Low Ambient operation. See Low Ambient Sequence for details.
13
Economizer Active
If confi gured, this relay will energize when the unit is in the Economizer Mode or when the damper
opens on a Make-Up Air unit.
14
Occupied Active
If confi gured, this relay will energize whenever the unit is in the Occupied Mode.
15
Override Active
If confi gured, this relay will energize anytime the space sensor Pushbutton override is active.
16
Alarm Active
If confi gured, this relay will energize anytime a VCB-X alarm is active.
17
Morning Warm-Up / Cool-
Down (VAV Boxes)
Confi gure (1) Relay for Morning Warm-Up / Cool-Down when Non-Orion VAV/Zone Controllers are
used.
18
Reheat Confi gure (1) Relay for On/Off Reheat when used.
19
Exhaust Fan
Confi gure (1) Relay for enabling exhaust fan when Building Pressure Control is used.
20
Heat Wheel
Confi gure (1) Relay that turns heat wheel on when in occupied operation and turns heat wheel off
when in Economizer Mode.
Table 5: User-Confi gurable Relay Outputs
Revised 4/11/14
