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Wiring inputs and outputs
TruVu™ VVTZC
-E2
©2022 Carrier.
Installation and Start-up Guide
All rights reserved.
56
5
Verify that zone controllers supplying multiple registers have manual dampers on each register branch duct
for balancing the design airflow through each register.
6
Disable the air source heating and cooling outputs using one of the following methods:
○
Physically di
sconnect the air source controller’s output wiring to the unit, then enable the fan.
○
In the i-Vu or Field Assistant tree, select the RTU Open or WSHP Open controller. Go to
Properties
>
Configuration
>
Service Configuration
>
Service Test
and enable
Service Test
and
Fan Test
. Make sure
all other outputs are disabled.
Step 2: Balance each zone
1
In the i-Vu® or Field Assistant tree, select the zone controller that is physically closest to the air source. Go to
Properties
>
Control Program
>
Configuration
>
Service Configuration
>
Pressure Dependent Control
>
Details
tab.
2
Do one of the following:
○
Single Duct or Parallel Fan zone terminals
–
Click
Cool Max
to override the zone damper to its maximum
open position. Check the zone for design cooling maximum airflow using certified measuring devices.
Make adjustments using the manual volume damper located upstream of the zone damper.
○
Series Fan zone terminals
–
Click
Damper Full Close
to override the zone damper to its fully closed
position. Wait 30 seconds after the damper is closed, select the
Fan
's
Lock value to
checkbox, then
select
On
in the droplist. Click
Apply
. You must follow this procedure to prevent the fan from turning
backwards. When the fan starts, click
Cool Max
to open the zone damper to its maximum position.
Check the zone for design cooling maximum airflow using certified measuring devices. See the zone
terminal manufacturer's instructions to adjust the fan speed to meet design airflow requirements. After
you set the fan speed, verify that the zone terminal plenum air intakes do not have a positive airflow. If
so, adjust the manual volume damper located upstream of the zone damper so that the airflow is not
positive or negative.
Note the zone’s name in the tree. You will need it when setting the system static pressure setpoint.
3
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
the branch ducts.
4
On the zone’s
Pressure Dependent Control
>
Details
tab, click
Cool Min
to set the zone damper to its cooling
minimum position. Type the desired damper position next to
Cool Min
to adjust the airflow to the design
value. If you do not have a design value, set the value to no less the 10% for minimum ventilation.
5
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure
Cool Min
is active, select the
Fan
's
Lock value to
checkbox, then select
On
in the droplist. Click
Apply
. See the zone terminal
manufacturer's instructions on adjusting the fan speed to meet design airflow requirements. When finished,
clear the
Fan
's
Lock value to
checkbox.
6
Click
Vent
to set the zone damper to its ventilation position. Type the desired damper position next to
Vent
to
adjust the airflow to the design value. If you do not have a design value, leave the value at 50% for minimum
ventilation.
7
Series Fan Zone Terminals only - If the zone maximum heating airflow design requirements are the same as
cooling, the
Heating Max Damper Position
should be 100%, same as the
Cooling Max Damper Position
. If
the heating requirement is less than the cooling requirement, type the appropriate value in
Heating Max
Damper Position
per the design requirements.
8
If the terminal has ducted reheat, click
Reheat Min
to force the zone to its reheat damper position. Type the
desired damper position next to
Reheat Min
to adjust the airflow to its design reheat position.
9
If the zone maximum heating airflow design requirements are the same as cooling, skip this step. If they are
less than cooling, click
Heat Max
to force the zone to its maximum heating position. Check the zone for
design heating maximum airflow using certified measuring devices. Type the damper position next to
Heat
Max
.