Performing System Checkout; Bypass Damper - Carrier TruVu VVTBP-E2 Installation And Startup Manual

Performing system checkout

Bypass damper

Verify the TV-VVTBP-E2 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 single tube from the controller's airflow (pressure) sensor is connected to the duct static
3
pressure probe downstream of the bypass damper. Then verify that the other connector is open when using a
ducted return, or connected to room space for plenum return.
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 navigation 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 Close, then verify that the damper is fully closed.
d) Click Damper Full Open, then verify that the damper is fully open.
e) Click Zero Cal to close the bypass damper and 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.
i) Using a branch-tee, connect a magnehelic gauge to the High tube on the controller's airflow sensor, then
measure the static pressure. If the measured static pressure is different from the Duct Static Pressure by
±.05 in. (+.012 kPa), click Pressure Sensor Cal, enter the measured value next to the button, then click
Apply.
j) Remove the magnehelic gauge from the High tube and reconnect the pressure tubing.
k) Click Automatic Control to return the bypass to normal control.
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.
TruVu™ VVTBP-E2
Installation and Start-up Guide
39
Start-up
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