LG MultiSITE MS8250 Installation Manual page 25

Pressure Dependent
Before starting to Balance the system, check if the following parameters are correctly config-
ured in the Configuration menu:
• VAV Box Type
• Actuator Type
• Floating Actuator Time
Air Flow Balancing settings can be found on the Balancing page of the Setup menu.
The recommended process for Balancing the system is:
1. On page "Balancing (PD)", set the approximate damper positions for Minimum, Maximum
Cooling, Maximum Heating, Reheat, and Damper Override.
2. For each position, repeat the following process:
• Set the Damper Override to the desired position (Minimum, Maximum Cooling, Maximum
Heating or Maximum Reheat).
• Allow time for damper to reach defined position.
• Take reading of actual air flow using a calibrated Balometer.
• Compare actual airflow to desired airflow and adjust the Damper Position accordingly by
adjusting the % value of the position options on the Balancing (PD) page (see next page).
• Repeat until measured airflow at the damper position matches the desired airflow.
3. On page "Balancing (PD)", revert the Damper Override to None to allow the system to return to normal operation.
Table 13: Pressure Dependent Balancing Options Screen.
Configuration Parameter
Min. Position (Minimum
Damper Position)
Default Value: 10%
Max. Cool Pos. (Maximum
Damper Position During
Cooling)
Default Value: 100%
Max. Heat Pos. (Maximum
Damper Position During
Heating)
Default Value: 100%
Reheat Pos. (Damper Position
During Reheating)
Default Value: 30%
Damp. Override (Damper
Override)
Default Value: None
BACnet
AV250 (R/W) Range: 0 to 100%
AV251 (R/W) Range: 0 to 100%
AV252 (R/W) Range: 0 to 100%
AV253 (R/W) Range: 0 to 100%
Force damper to selected position during balancing.
0 - None: No damper override. Damper under normal control.
1 - Minimum Flow: Force damper to maintain minimum airflow setpoint.
2 - Max. cool: Force damper to maintain maximum cooling airflow setpoint.
MV172 (R/W)
3 - Close: Force damper closed.
4 - Reheat: Force damper to maintain maximum reheat airflow setpoint.
5 - Open: Force damper fully open.
Choices: None, Minimum, Max. Cool, Close, Reheat and Open.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG Life's Good" is a registered trademark of LG Corp.
BALANCING
Figure 14: Balancing PD Display.
Balanci ng
Min . posi tio n
Max. cool p os.
Max. heat p os.
Reheat p os.
Dam p. overr ide
Function Description
1 0 %
10 0 %
1 00 %
3 0 %
Non e
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