Power Outage Clock Reset - LG MultiSITE MS8250 Installation Manual

POWER OUTAGE CLOCK RESET / BALANCING

Power Outage Clock Reset

In the event of a power outage, the Room Controllers retain the correct time as long as the duration of the power outage is not prolonged.
Depending on the duration of the power outage, the Room Controller internal clock may need to be updated or reset completely. The follow-
ing table gives an indication of the expected clock performance after a power outage.
Table 10: Controller Clock Operation After a Power Outage.
Outage Duration
0 - 24 hours
24 - 36 hours
36 - 72 hours
72+ hours
Balancing
During balancing, a technician will install a calibrated flow sensor (balometer) over the outlet in each room and use this to calibrate the
MS8250 VAV Room Controller.
Pressure Independent:
• True air flow will be measured using the balometer and compared to the airflow calculated by the MS8250 at various setpoints.
• MS8250 calibration parameters will be adjusted to ensure the calculated air flow matches the true air flow.
Pressure Dependent:
True air flow at various damper position percentages will be measured and used to set the appropriate damper percentages for the air flow
required for the zone.
Figure 11: Balancing Pressure Diagram.
Flow sensor
(PI only)
Clock no longer increments and must adjusted when power is restored
Clock functions are fully reset, and must be re-initialized as per a new installation
Damper
Calibrated
Flow Sensor
(Balometer)
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.
Controller Operation
Clock functions are normal
Clock accuracy not guaranteed, time may need to be adjusted
Balancing menus will timeout after eight (8) hours and
any Damper Override will be removed, returning the
zone to normal operation.
21