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Start-up
Point Name/Description
Bypass Control
Direction Clockwise
rotates clockwise.
(Only in i-Vu/Field Assistant)
Duct 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
Performing system checkout
Bypass damper
Verify the VVT Bypass Controller is securely fastened to the bypass damper shaft and duct work.
1
Verify duct air temperature sensor is installed at the inlet of the damper or in the air source supply duct
2
upstream of the bypass damper connection.
Verify that the high pressure tubing from the controller's airflow (pressure) sensor is connected to the
3
supply duct static pickup downstream of the bypass damper. Then verify that the low pressure connector
is not blocked.
Calibrate damper and pressure sensor:
4
a)
Disable the air source heating, cooling, and fan outputs using one of the following methods:
• Physically disconnect the air source controller's output wiring to the unit.
• In the i-Vu or Field Assistant tree, select the RTU Open controller. Go to Properties > Equipment >
Configuration > Service Configuration > Service Test, then enable Service Test. Make sure all
other outputs under Service Test are disabled.
b)
Select the Bypass controller in the tree, then go to Properties > Equipment > Unit Configuration >
Bypass Control > Details
c)
Click
d)
Click
e)
Click
Apply
f)
Enable the air source fan output using one of the following methods:
• Physically connect the air source controller's fan enable wiring at the unit.
• In the i-Vu or Field Assistant tree, select the RTU Open controller. Go to Properties > Equipment >
Configuration > Service Configuration > Service Test, then enable Fan Test. Make sure all
other outputs under Service Test are disabled.
g)
Select the Bypass controller in the tree, then go to Properties > Equipment > Unit Configuration >
Bypass Control > Details tab.
16
– Set this field to the damper's position when it
– The normal static pressure setpoint
.
tab.
Damper Full Close
, then verify that the damper is fully closed.
Damper Full Open
, then verify that the damper is fully open.
Zero Cal to close the bypass damper and zero the pressure sensor. When Done appears, click
.
Default/Range
D:
Close
R:
Open/Close
D:
.5 in. H
O
2
R:
.1 to 2.0 in. H
O
2
D:
.8 in. H
O
2
R:
.1 to 2.0 in. H
O
2
VVT Bypass Controller
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