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Appendix A: VVT Bypass Controller Points/Properties
Point Name/Description
Maximum Heating SAT – The value that the SAT must exceed to cause the static
pressure setpoint to be set to the LAT Duct Static Pressure Setpoint. This is also the
Supply Air Temperature Alarm's high limit.
Minimum Cooling SAT – The minimum low limit value that the SAT must exceed to
cause the static pressure setpoint to be set to the LAT Duct Static Pressure Setpoint.
This is also the Supply Air Temperature Alarm's low limit.
Pressure Control Deadband – The amount that is added to and subtracted from the
bypass controlling setpoint (Duct Static Pressure Setpoint or LAT Duct Static Pressure
Setpoint). When the static pressure is within the controlling setpoint +/- this value, the
output to the actuator or VFD drive maintains at its current position. When the static
pressure is greater than the controlling setpoint +/- this value, the output modulates
accordingly.
CAUTION If this value is too low, the damper may oscillate to maintain the static
pressure. This could cause the actuator to fail prematurely.
Bypass Control
Direction Clockwise – Set this field to the damper's position when it rotates
clockwise.
(Only in the i-Vu®/Field Assistant applications)
Duct Static Pressure Setpoint – The normal static pressure setpoint the
controller will maintain.
LAT Duct Static Pressure Setpoint – The static pressure setpoint that the
controller will maintain if the SAT exceeds the Maximum Heating SAT or
Minimum Cooling SAT value. To disable this function, set this value less than
or equal to the Duct Static Pressure Setpoint.
Locks –
CAUTION Overriding these values may damage equipment or
ductwork.
Duct Static Pressure – Lets you override the static pressure sensor input for
testing and troubleshooting.
Target damper position – Allows you to override the normal control of the
damper/VFD for the purpose of testing and troubleshooting.
VVT Bypass Controller
Installation and Start-up Guide
Carrier Proprietary and Confidential
30
Default/Range
D:
120°F (48.9°C)
R:
40 to 180°F
(4.4 to 82.2°C)
D:
45°F (7.2°C)
R:
40 to 180°F
(4.4 to 82.2°C)
D:
.05 in H
O (.012 kPa)
2
R:
0 to 2.0 in. H
O
2
(0 to .498 kPa
D:
Close
R:
Open/Close
D:
.5 in. H
O (.125 kPa)
2
R:
.1 to 2.0 in. H
O
2
(.025 to .498 kPa)
D:
.8 in. H
O (.199 kPa)
2
R:
.1 to 2.0 in. H
O
2
(.025 to .498 kPa)
R:
0 to 2.0 in. H
O
2
(0 to .498 kPa
R:
0 to 100%
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