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42004-472C
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ANUAL
Page 19 of 34
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-472C.docx
07/16
Extreme Cold Temperature Option
RED ALERT
®
Auto-Dial Telephones equipped with the Extreme Cold Temperature Option (-003AD
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 equipped with a 4-foot power cable with integral connector,
which 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 15 for the 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. Use of 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 16. Extreme Cold Temperature
Piezo Button (Typical)
N
OTE
:
RED ALERT telephone models ending with the “FS” suffix are equipped with non-tactile
pushbutton(s) making them extreme cold weather capable. Operation to
−
40 °F (
−
40 °C) can be
accomplished by adding a No. 40404-045 Power Supply (120 V ac required).
Auxiliary Output Control
As previously noted, each RED ALERT
®
Telephone is capable of providing two isolated control outputs
in the form of a dry (volt-free) contact closure rated for 125 mA at 48 V dc or 80 mA at 28 V ac.
Output one connects to TB2 on the telephone’s PCBA (refer to Figure 15). This output closes when an
auto-dial call begins (auto-dial
CALL
push button activation only) and remains in that state for the
duration of the telephone call. The typical use of this output is to activate the flashing sequence on a
GAI-Tronics Strobe.
N
OTE
:
Output one can be programmed to remain closed for up to 255 minutes (in one-minute
increments) after the auto-dial call ends. This output extension can be deactivated via an external switch
or by pressing “
*921
” on the keypad of the called telephone while the call is in progress. The RED
ALERT
®
Telephone will acknowledge acceptance of this deactivation command with a short beep. If the
beep is not initially received, retry the command. This feature requires the use of GAI-Tronics No.
40404-045 Plug-in Power Supply (120 V ac source required).
