Installation
The wiring diagrams in the manual should be followed carefully. heavy duty
conductors on wiring diagrams are shown heavily outlined, These wires
should be doubled up.
Lock release back EMF protection :
A diode must be fitted across the
terminals on the lock release to suppress back EMF voltages. The diagram
below shows the polarity of the diode when fitted to the release.
+
-
1N4002
+
-
12V DC
LOCK RELEASE
DIODE
Cable size and type :
When running cables for any intercom system, these
cables must be installed separately from the mains cables. All multipair
cables should be to CW1308 specification. (0.5mm twisted pair telephone
cable). Max resistance = 10 Ohm.
Lock release wires should be doubled up. Max resistance = 3 Ohm
The cables sizes above can be used for distances up to 100m. On distances
above 100m the cable sizes should be increased to keep the overall
resistance of the cable below the RESISTANCES indicated above.
Safety Note :
The earth wire from the cabinet lid should be connected to the
cabinet base and then to the earth connection in the building. This should be
checked for continuity.
Testing the installation :-
Check all the connections have been made correctly and then power up.
Call all the apartments in turn. Check for call tone to the apartment, speech in
both directions and lock release.
If the volume of speech needs to be adjusted, this can be done by adjusting
the presets on the rear of the amplifier at the door panel. (Repeat the above
for door two).
If the call tone volume needs adjusting this can be done at each handset
(Jumper marked VOL).
Check the fireman switch (If fitted).
Set the time clock on, off times. Check the trade button only works when the
time clock is on.
