Testing and Maintenance
August 2007 5-2 P/N 06-236716-001
5-3 TESTING
5-3.1 Battery Status Check
1. Disconnect AC power.
2. Allow control unit to operate on the batteries for about one hour.
3. Measure the individual battery voltages. If any battery reads 1.5 V or more below its rated
voltage, that battery should be replaced.
Generally, if one of the batteries is low, the other(s) will soon fail. It is advisable to replace all
the batteries in a set when one requires replacement. Any battery that has been in service for
36 months or more must be replaced.
5-3.2 Battery Test
The following sequence will display the battery open circuit voltage and charge current:
1. Press and hold Acknowledge and Signal Silence control switches simultaneously for five
(5) seconds. As long as both keys are pressed, the battery voltage is displayed for three
(3) seconds, and then the battery current. These alternate every three (3) seconds.
2. The battery test will exit if either control switch is released, or if a control unit status
change occurs.
5-3.2.1 BATTERY VOLTAGE DISPLAY
Battery voltage will be as shown in Figure 5-1. The units are in Volts.
Figure 5-1. Battery Voltage Display
5-3.2.2 BATTERY CHARGE CURRENT DISPLAY
Battery charge current will be as shown in Figure 5-2. The units are in Amps.
Figure 5-2. Battery Charge Current Display
5-3.3 Replacing the Batteries
Before replacing batteries, disconnect AC power. Batteries should be replaced at least once
every 36 months, or as directed by the local Authority Having Jurisdiction. Do not install a
battery set whose open circuit voltage is less than 22 volts.
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