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TW-357 REV E
31
Display Brightness
DISPLAY BRIGHTNESS can be set through the menu system of the control (MENU, 6, 3). This option
changes the intensity of the display. The possible choices are 25%, 50%, 75% and 100%.
About this Control
ABOUT THIS CONTROL can be accessed in the menu system (MENU, 6, 4). This option provides
information about the control. In particular it tells the serial number of the control and the software version
that the control is running.
Control On Battery Backup Version
This controller is similar to the AC Kryos Controller. The menu system and all features are identical. The
only operational difference is if a power failure occurs, the control goes into battery backup mode. The Kryos
control operates on 24 VAC power. As an option, however, the control can also operate on battery power to
provide up to 72 hours of continuous service without AC power. The system is designed for full operational
service during a power failure, including full solenoid valve operation. The battery backup system can be
ordered from Taylor-Wharton and should be factory installed.
Differences between the regular Kryos and the battery backed Kryos:
Please see the chart below for the differences between the two systems.
Regular Kryos Battery Backed Kryos
SOLENOID VALVE
24 VAC solenoid 12 VDC solenoid
Wall Transformer
24 VAC/ 40 Voltamps output 16.5 VAC/ 40 Voltamps output
Battery
None 17amp-hour
Battery Extension Cable
None Connects battery to control board
Software
V4.0 V4.0
Control Board (1)
Black 2-pin solenoid valve
plug
Red 2-pin solenoid valve plug &
Red 3-pin battery plug.
(1) The control board for the battery backup is quite different than the control board for the regular Kryos in
that a number of parts are either removed or changed. The best way to tell if the control is a battery
backed unit or a regular unit is to look at the valve connector.
Operation
The software is designed such that if power is lost and a battery-backed control is in place, the control detects
the loss of power and continues to operate from the battery. If power is lost, a “Battery Backup” message
appears on the display, the alarm beeper sounds and the red LED starts to flash. After a short period of time
(approximately 10 seconds) the display will go dark to conserve power, however the red LED will continue to
flash and the beeper will continue to sound until it is muted. The display can be brought back at any time by
pressing any button on the front panel.
The control will continue to monitor the system, record logs and operate the valve until the battery runs too
low. Original specifications required that the battery run, fully operational, for at least 72 hours. Battery
backup mode is treated by the control as an alarm condition. This means that the remote alarm will be
triggered after a period of time as defined by the user.
Note: We strongly recommend that all Cryo-Storage systems be connected to a redundant alarm, a
building alarm system or a dialer. This insures that someone is notified if an error condition persists.