Appendix A: VVT Bypass Controller Points/Properties
VVT Bypass Controller
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
All rights reserved
31
Point Name/Description
Default/Range
Test and Balance
Zero Cal
– Closes the bypass damper and waits for the air source to go to the
Off mode before zeroing out the static pressure sensor. This does not occur if
the static pressure is > .05 in. H
2
O (.0125 kPa) .
Pressure Sensor Cal
– Allows you to calibrate the pressure sensor after the
Zero Cal has been performed. To enter a value here, neither the damper nor
the pressure sensor can be locked, the bypass cannot be in LAT mode and the
damper position must be >0% and <100%. The value entered will be the actual
static pressure measured with an accurate static pressure measuring device.
Damper Full Open
– Overrides the damper to its full open position.
Automatic Control
– Returns the damper to its normal control routines.
This
must be activated when you finish using any of the other Test and Balance
commands.
Damper Full Close
– Overrides the damper to its full closed position.
Local Sensor Calibration
Supply Air Temperature
– Displays the current supply air temperature.
R: -56 to 245°F
(-48.9 to 118.3°C)
Supply Air Temp Calibration
– A calibration offset value to allow the supply air
temperature sensor to be adjusted to match a calibrated standard measuring the
temperature in the same location.
R: -20 to 20 °F
(-11.1 to 11.1 °C)
Maintenance
Navigation:
i-Vu® / Field Assistant:
Properties
>
Control Program
>
Maintenance
Point Name/Description
Range
Static Pressure
– The current supply duct static pressure.
R:
0 to 2.0 in. H
2
O
(0 to .498 kPa
Controlling Pressure Setpoint
– The active static pressure setpoint that the bypass
controls to.
R:
.1 to 2.0 in. H
2
O
(.025 to .498 kPa)
Max Duct Pressure Setpoint
– The Pressure Control Deadband that is added to the
active static pressure setpoint.
R:
0 to 2.0 in. H
2
O
(0 to .498 kPa
Min Duct Pressure Setpoint
– The Pressure Control Deadband that is subtracted from
the active static pressure setpoint.
R:
0 to 2.0 in. H
2
O
(0 to .498 kPa
