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42004-438A
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f:\standard ioms - current release\42004 instr. manuals\42004-438a.doc
02/11
Extreme Cold Temperature Option
RED ALERT™ Emergency Telephone equipped with the Extreme Cold Temperature Option (-003 and
-004 models) are capable of operating to –40° C (non-option models are rated to –20° C). This option
includes two identifying features.
Each telephone is shipped with a plug-in power supply that requires a 120 V ac input to provide a 5 V dc
output to the unit. The power supply is a connectorized, 4-foot power cable that plugs into P17 on the
telephone PCBA. P17 must be vacated prior to plugging in the power supply. To do so, remove the
jumper from P17 pins 3 and 4 and plug it into the adjacent J18 header. Refer to Figure 23 for connector
locations.
In addition to the plug-in power supply, the -003 and -004 models have had the standard tactile
(moveable) push buttons (
EMERGENCY
and/or
CALL
) replaced with non-tactile (non-moveable) push
buttons. Using a non-moveable switch eliminates the possibility of water or melting snow from forming
and freezing behind the push button, ultimately preventing the movement necessary for activation.
Figure 24. Extreme Cold Temperature
Piezo Button (Typical)
