Start-up
VAV Zone II Controllers
CARRIER CORPORATION ©2019
Installation and Start-up Guide
All rights reserved
44
2
Do one of the following:
○
Single Duct or Parallel Fan zone terminals – Click
Cool Max Airflow
to override the zone control and
increase the airflow to the cooling maximum cfm (liters/second) . Check the zone for design cooling
maximum airflow using certified measuring devices. Enter the measured cfm (liters/second) and click
the arrow to enter the current sensor reading value.
○
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. 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 to deliver the
Cool Max Airflow
, click the
Cool Max Airflow
.
Verify the airflow using a certified measuring device. Enter the measured cfm (liters/second) and press
the arrow to enter the current sensor reading value. Verify that the zone terminal plenum air intakes do
not have a positive airflow.
3
Check all branch duct terminal registers for design flow. If necessary, adjust the manual volume dampers in
the branch ducts.
4
Single Duct or Parallel Fan zone terminals - Click
Occupied Min Airflow
to set the zone damper to its
minimum airflow position. Verify the airflow using a certified measuring device. Enter the measured cfm
(liters/second) and click the arrow to enter the current sensor reading value.
5
Parallel Fan Zone Terminals only - To adjust Parallel Fan airflow, make sure
Occupied Min Airflow
is selected,
select the
Fan
's
Lock value to
checkbox, then select
On
in the drop-down list. 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
If the terminal has ducted reheat, select the
Flow Setpoint
in the
Locks
section and enter
Auxiliary Heat Min
Airflow
if it is greater than the
Occupied Min Airflow
. Select
Auxheat
and enter 100%. Click
Apply
. Verify the
supply air temperature rises for ducted heat. For non-ducted heat, physically verify that the heat is energized.
Deselect a
Flow Setpoint
and
Auxheat
and click
Apply
when finished.
7
Repeat steps 1 through 6 for each zone until all zones have been balanced. Make sure that you select
Automatic Control
before moving on to the next zone.
Balancing the system using Test & Balance tool
Use the Test & Balance tool to manipulate the controllers associated with an air source, but not the air source
itself or heating and cooling equipment such as chillers and boilers. See the Test & Balance Help for more
information on using the tool.
Most VAV system airflow designs are based on cooling requirements which require a greater cfm (liters/second)
flow than heating requirements. Using this balancing procedure, you adjust the cooling airflow first. If the heating
and cooling maximum airflow requirements are the same, you will not need to balance the heating airflow.
NOTE
We recommend that the total heating minimum airflow settings for all the zones in the system be set to
maintain the air source’s design minimum heat cfm (liters/second) airflow across its heat exchanger to prevent
damage to the equipment.
Содержание VAV Zone II
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