Navien KD One UHA-422SG/M User Manual page 12

Intercommunication between videophones (when they are connected)
■
When a call signal comes
from another videophone,
Talk LED ickers and home
call melody rings.
(about 30 seconds)
'INTERCOM' appears at the top of the screen
Call signaling to another videophone
■
When you push the "Talk" Button,
the Talk LED is illuminated and
you are in the state of connection.
At this point, you can give a call
signal to another videophone.
'INTERCOM' appears at the top of the screen
12
When the "Talk" Button is
pushed, Talk LED is lit and
talking starts.
Regardless of whether the other
videophone line is busy or not,
if you push the Talk Button
or talking time expires
(max. 1 minute) , the screen goes
blank and talking ends.
When the "Talk" button
is pushed during
communication or the talk
duration(up to 1minute),
the screen goes blank and
conversation ends.