AAON VCCX2 User Manual

84VCCX2 Controller Technical Guide
APPENDIX C: BACNET GUIDE
Analog Values
VCCX2 ANALOG VALUES
Parameter Object Description Limits
Minimum
Limits Maximum
Outdoor Air Damper Override AV: 70 Overrides all other Outdoor Air Damper position commands
to maintain this xed position. Conguring for “Auto”
restores normal unit control of the Outdoor Air Damper/
Economizer operation.
NOTE: If Economizer is enabled and a value less than
100% is written, compressors will disable. See Economizer
Override via BACnet section in the Economizer area of the
Sequence of Operations for additional information.
0% Auto=65535 100% Auto=65535
Supply Setpoint Override AV: 71 This overrides whatever setpoint the Supply Air Temperature
is currently being controlled to.
0=No Override.
0°F (-17.7°C) 200°F (93.3°C)
Space Temperature Value AV: 72 If the controller is congured for this operation, the user can
write a Space Sensor value
0°F (-17.7°C) 120°F (48.8°C)
Space Humidity Value AV: 73 If the controller is congured for this operation, the user can
write a Space Humidity Sensor value
0 100
Indoor RH Calibration O󰀨set AV: 74 If the Space Humidity Sensor is reading incorrectly, use
this option to enter an o󰀨set humidity to adjust the Sensor’s
Humidity
-1 1
Relief Fan VFD AV: 75 Override to force the VFD to this percentage speed.
Conguring “Auto” restores normal unit control of the VFD
speed
0% Auto=65535 100% Auto=65535
Relief Pressure Value AV: 76 If the controller is congured for this operation, the user can
write Building Pressure Sensor value
-0.5 0.5
Carbon Dioxide Value AV: 77 If the controller is congured for this operation, the user can
write a CO2 Sensor value.
0 3000
Outdoor Air Temperature Value AV: 78 If the controller is congured for this operation, the user can
write an Outdoor Sensor value
-40°F (-40°C) 150°F (65.5°C)
Outdoor Air Humidity Value AV: 79 If the controller is congured for this operation, the user can
write an Outdoor Humidity Sensor value
0 100
High Level Enthalpy
(Reserved)
AV: 80 Reserved 10 50
Low Level Enthalpy
(Reserved)
AV: 81 Reserved 10 50
Max Plenum Pressure Setpoint
Reset Limit
AV: 82 Reserved 0.1 1.4
Min Plenum Pressure Setpoint
Reset Limit
AV: 83 Reserved 0.1 1.4
Enthalpy Enable Setpoint AV: 84 If congured for Comparative Enthalpy Economizer Control,
the OA Enthalpy must be below this setpoint by the Enthalpy
Enable Deadband before the OA/RA Enthalpy comparison is
utilized to enable the Economizer
25 BTU/lb. 35 BTU/lb.
EnthalpyEnable Deadband AV: 85 The OA Enthalpy must be below the Enthalpy Enable
Setpoint by this amount, and the OA Enthalpy must
be below the RA Enthalpy by this amount to utilize the
Economizer
0.3 BTU/lb. 1.5 BTU/lb.
Maximum Static Setpoint
Reset Limit
AV: 86 As the most open VAV damper rises above 80%, the static
setpoint resets up to this maximum limit
0.01 “WG 3.00 “WG
Minimum Static Setpoint Reset
Limit
AV: 87 As the most open VAV damper drops below 80%, the static
setpoint resets down to this minimum reset limit
0.01 “WG 3.00 “WG
Static Setpoint Reset Interval AV: 88 The Reset Interval is how often the setpoint reset calculation
occurs. This must be an infrequent event, so the default is
15 minutes.
10 min 60 min
Objects labeled AV are read/write. The only sensor values that can be written to are AV points 72, 73, and 76 through 79.

AAON VCCX2 Specifications

General

Brand	AAON
Model	VCCX2
Category	Controller
Language	English