AAON Orion VCCX2 User Manual

127
VCCX2 Controller Technical Guide
BACnet
®
Properties for the VCCX2 Controller
Parameter Object Description
Limits
Minimum
Main Fan
VFD in
Cooling
Mode
AV: 45 In Single Zone VAV
conguration, this is the fan
speed at which the VFD will
start when Cooling is initiated.
In a VAV
conguration this is the lowest
fan speed allowed in the Cool-
ing Mode. In CAV and MUA
congurations this should be
set to 100%.
0 100
Minimum
Main Fan
VFD in
Heating
Mode
AV: 46 In Single Zone VAV
conguration, this is the fan
speed at which the VFD will
start when
Heating is initiated. In a VAV
conguration this is the lowest
fan speed allowed in the Heat-
ing Mode. In CAV and MUA
congurations this should be
set to 100%.
0 100
Minimum
Main Fan
VFD in Vent
Mode
AV: 47 Speed at which the VFD will
operate in the Vent Mode in
Single Zone VAV.
0 100
Maximum
Economizer
in Heating
Mode
AV: 48 Max position the
Economizer Damper can open
to in Supply Air Tempering
during Heating Mode. Takes
priority over Max Position in
High CO
2
.
0 100
Minimum
Economizer
Position
AV: 49 The minimum position of the
Outdoor Air damper in the
Occupied Mode. This can be
reset upwards based on indoor
CO
2
levels. NOTE: See Econ-
omizer Override via BACnet
®-
section in the Economizer area
of the Sequence of Operations
for additional information.
0 100
Maximum
Economizer
CO
2
Reset
Limit
AV: 50 The maximum value the Econ-
omizer Minimum Position can
be reset up to
during CO
2
override.
0 100
Minimum
Carbon
Dioxide
Setpoint
AV: 51 This is the threshold CO
2
level
at which the
Economizer Min Damper
Position Setpoint will begin to
be reset higher.
0 2000
Maximum
Carbon
Dioxide
Setpoint
AV: 52 This is the CO
2
level at which
the Economizer Min Damper
Position will be reset to the
Economizer Max Position in
High CO
2
. In between the Min
and Max CO
2
levels the Econ-
omizer Min Damper Position
will be proportionally reset
between the congured Min
Damper Position and the Max
Position in
High CO
2
.
0 2000
BACnet
®
Properties for the VCCX2 Controller
Parameter Object Description
Limits
Indoor
Humidity
Setpoint Low
Reset Limit
AV: 53 On indoor controlled (non
MUA) units, this is the
Humidity setpoint at which the
unit leaves
Dehumidication. During
Coil Temp Reset, this is the
lowest Space RH value that
corresponds to the High Coil
Temp Setpoint.
0 100
Indoor
Humidity
Setpoint High
Reset Limit
AV: 54 On indoor controlled (non
MUA) units, this is the
Humidity setpoint at which the
unit initiates
Dehumidication. During
Coil Temp Reset, this is the
highest Space RH value that
corresponds to the Low Coil
Temp Setpoint.
0 100
Duct Static
Pressure
Setpoint
AV: 55 Current Static
Pressure Setpoint.
.10 3.0
Duct Static
Pressure
Control
Deadband
AV: 56 Value above and below the
Duct Static Pressure Setpoint
where no control change
occurs.
.01 .5
Building
Pressure
Control
Setpoint
AV: 57 Building Pressure
Setpoint or
Exhaust Duct Static
Pressure Setpoint.
-.20 3.0
Building
Pressure
Control
Deadband
AV: 58 Value above and below the
Building Pressure
Setpoint or the Exhaust Duct
Static Pressure Setpoint where
no control change occurs.
.01 .5
Minimum
Outdoor
CFM Re-
quirement
AV: 59 Minimum Outdoor
Airow CFM Setpoint
.10K 200K
Outdoor
CFM Control
Deadband
AV: 60 Controls rate of change for
damper signal. As OA CFM
moves further from setpoint
within this
window, the damper makes a
larger change.
10 1000
Single
Zone VAV
Fan Speed
Integral
AV: 61 The Integral Constant for Sin-
gle Zone VAV Fan Control.
0 10
Relay
Run-time
Hours
Warning
Limit
AV: 62 If any congured relay’s run
time exceeds this number of
hours of
operation, a warning alarm is
generated so that
periodic maintenance can be
performed.
0 30000
Cooling
Mode Head
Pressure
Setpoint
AV: 63 Head Pressure Setpoint in the
Cooling Mode.
250 450
APPENDIX C
-
VCCX2 BACnet
®
VCCX2 BACnet
®
Parameters

AAON Orion VCCX2 Specifications

General

Brand	AAON
Model	Orion VCCX2
Category	Controller
Language	English