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l)
Enable the air source's heating and cooling outputs using one of the following methods:
• Reconnect the air source controller's output wiring at the unit.
• In the i-Vu® or Field Assistant tree, select the RTU Open controller. Go to Properties > Control
Program >
Configuration > Service Configuration > Service Test, then disable Service Test and Fan
Test. Make sure all other outputs under Service Test are disabled.
CAUTION Pressing the actuator release button and moving the damper or disconnecting the actuator ribbon
connector while the bypass controller is powered will cause the damper position to be out of calibration. To
recalibrate the damper position, you must perform steps 4c and 4d above or power cycle the controller.
Variable frequency drive (VFD)
1
Verify that the controller's VFD/ACT output wiring is correctly connected to the VFD and that the VFD is
configured for a 0-10 Vdc control signal.
2
In the i-Vu or Field Assistant tree, select the Bypass controller. Go to Properties > Control Program > Unit
Configuration, then verify that Control Device Type is set to VFD.
3
Verify duct air temperature sensor is installed in the air source supply duct.
4
Verify that the high pressure tubing from the controller's airflow (pressure) sensor is connected to the
duct static pressure probe downstream of the bypass damper. Then verify that the low pressure
connector is not blocked.
5
Calibrate the VFD and pressure sensor:
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 > Control
Program >
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 > Control Program > Unit
Configuration > Bypass Control > Details tab.
c)
Click Damper Full Open, then verify the voltage at VFD/ACT and Gnd is 0 Vdc.
d)
Click Damper Full Close, then verify the voltage at VFD/ACT and Gnd is 10 Vdc.
e)
Click Zero Cal to zero the pressure sensor. When Done appears, 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 > Control
Program >
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 > Control Program > Unit
Configuration > Bypass Control > Details tab.
h) After the static pressure has stabilized, make sure that Target Damper Position and Duct Static
Pressure are not locked and that Target Damper Position is >0% and <100%. You may have to
adjust the Duct Static Pressure Setpoint slightly to get the damper within this range.
VVT Bypass Controller
Installation and Start-up Guide
Carrier Proprietary and Confidential
19
Start-up
CARRIER CORPORATION ©2017
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