VCC-X Operator Interface SD
VCC-X CONFIGURATION
31
VCC-X Con
fi
guration Screens
period. By the time the difference is 1
˚
, the signal change will be
2% per time period. With a Proportional Window of 2
˚
, if you are 2
˚
or more from setpoint, the amount of signal change will be 10% per
time period, and at 1
˚
from setpoint the change would be 5% per time
period. So, a larger proportional window allows for
fi
ner tuning of
the control signal to prevent overshooting.
Default is 10.0ºF/5.55ºC.
Description
Minimum
Default
Maximum
Economizer Control
Rate
1 sec
10 sec
30 sec
Proportional Window
1.0ºF
0.10ºC
10.0ºF
5.55ºC
30.0ºF
16.6ºC
Con
fi
guration Screen #34 - Economizer
Voltage Output
VCC-X Cnfg ID #
Econo Voltage Output
Min Volts: 2.0VDC
Max Volts: 10.0VDC
Enter
a value between 0.0 and 10.0 VDC for the Economizer mini-
mum and maximum output voltage.
Defaults are 2 VDC Min and
10 VDC Max.
Description
Minimum
Default
Maximum
Min Economizer Voltage
0
2
10
Max Economizer Voltage
0
10
10
Con
fi
guration Screen #35 - CO
2
Sensor
Installed
VCC-X Cnfg ID #
CO2 Sensor Installed
NO
USE < or > TO CHANGE
Select
YES if you have a CO
2
Sensor installed.
Default is NO.
Con
fi
guration Screen #36 - Building Pressure
Sensor Installed
VCC-X Cnfg ID #
Building Pr. Sensor
Installed
None
If this unit has a Building Pressure Sensor installed,
select
Analog if
it is a wired sensor.
Select
Receive Broadcast if the Building Pres-
sure Sensor is attached to a separate device that will broadcast the
reading, e.g., GPC-XP Controller.
Default is None.
Con
fi
guration Screen #37 - Building Pressure
Control
VCC-X Cnfg ID #
Building Pr. Control
None
USE < or > TO CHANGE
Default is None.
Available options are:
None
—No Building Pressure Control by this controller.
On/Off Exh Relay
—If an On/Off Exhaust Fan is being
used, select this option and con
fi
gure a relay output as
Exhaust Fan. If the building pressure rises above
setpoint, this relay will energize. This is Direct-Acting
control.
Modulating Exh
—If the building pressure rises above
setpoint, a modulating signal will be used to control an
exhaust fan VFD or a modulating damper to maintain
setpoint. A relay con
fi
gured as Exhaust Fan can be used
to enable this device so that the modulating signal can
control it. This is Direct Acting control.
OA Damper
—Select if reverse acting Building Pressure
Control using the Outdoor Air Damper is required. If
the building pressure falls below setpoint, the OA
Damper (Economizer) signal will be used to modulate
the OA Damper to maintain setpoint. This is Reverse
Acting
control.
Supply Fan
—Contact WattMaster Factory regarding
this reverse acting Building Control option. This should
not be used in most applications. This is Reverse Acting
control.
Con
fi
guration Screen #38 - Building Pressure
Control Rate
VCC-X Cnfg ID #
Building Pr. Control
Rate: 10 Sec
[ 1 - 30 Seconds ]
Default is 10 seconds.
The Building Pressure Control Rate is the
time period between changes to the Building Pressure Control signal.
Con
fi
guration Screen #39 - Building Pressure
Control Max Adjust
VCC-X Cnfg ID #
Building Pr. Control
Max Adjust: 5%
[ 1 - 30% ]
This is the maximum amount that the Building Pressure Control
output can adjust to when it needs to.
Default is 5 percent
.
