GAI-Tronics 393-001AD, RED ALERT Auto-dial Telephones - Manual (Page 19)

P UB . 42004-472B
A UTO -D IAL T ELEPHONE M ANUAL P AGE
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Extreme Cold Temperature Option
RED ALERT ® Auto-Dial Telephones equipped with the Extreme Cold Temperature Option (-AD3
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 11 for connector
locations.
In addition to the plug-in power supply, the –003AD models have had the standard tactile (moveable)
push button (
CALL) replaced with non-tactile (non-moveable) push button. 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 12. Extreme Cold Temperature
Piezo Button (Typical)