Teledyne 1220 - Multipoint flammable gas and vapor detection system - Manual (Page 25)

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Multi-Channel Combustible Monitor Installation 3
Teledyne Analytical Instruments
The internal audible alarm may be disabled by removing JP17.
WARNING: It is not recommended to remove JP17 unless
there is an external audible alarm in use. With the
jumper removed, the audible alarm will not warn
personnel about alarm conditions.
3.4 Channel Modules
Channel Modules may be removed by first unscrewing the top (retain-
ing) screw and then unscrewing the bottom (jack) screw. As the jack screw
is backed out, it will pull the module from its socket. When the jack screw is
free, the module may be slid out by pulling on the two screws. In the event
it is desired to remove a channel module without disturbing the common
alarm circuits, the channel module may be switched into standby mode, by
pressing the
switch, before removal. Reinstallation of the channel