Helmer Scientific i.Series
®
and Horizon Series
™
Freezer - Undercounter
Service and Maintenance Manual
360417/A
42
9.4
Connect Back-Up Power
The monitoring system and chart recorder each have a back-up battery system enabling a period of continuous operation if power
is lost.
Battery life varies by manufacturer as well as voltage level remaining. Providing full battery power is available, back-up power for
the monitoring system is available for up to two hours. Providing full power is available, back-up power for the optional Access
Control system is available for up to 2.5 hours.
Before installing or replacing batteries, switch AC power and back-up battery switch OFF. Disconnect freezer from
AC power.
Notes
• The optional Access Control system uses an independent battery for back-up power.
• If AC power is lost, the monitoring system will automatically disable some features to prolong back-up battery power.
Data collection will continue until back-up battery power is depleted.
The monitoring system back-up battery is located below the chamber, behind the front access panel. The right side panel cover
must be removed to access the optional Access Control back-up battery.
Monitoring system back-up battery.
Optional Access Control back-up battery.
9.5
Defrost Events
The number of defrost events is dependent on environmental conditions and the frequency of usage. Each unit may have up to
four programmable defrost event cycles per 24 hours. The frequency of events is determined by switch settings on the control
board. The freezer ships from the factory with three preprogrammed defrost events per 24 hours. Defrost events are timer based
recurring every eight hours with the first beginning eight hours after initial power up.
A manual defrost event may be initiated through the manual defrost momentary push button on the control board. Access to the
manual defrost button is available from the right side of the freezer by removing the right-side panel to access the control board.
To optimize defrost system effectiveness, ensure manual defrost events are initiated at times when the freezer door is likely to
remain closed or opened infrequently.
Control board
Manual defrost momentary button.
Horizon Series
