Farfisa ST 720 Technical Manual page 66

Si 221L/5S
5 INTERCOMMUNICATING INTERCOMS CONNECTED TO 2 EXTERNAL DOOR STATIONS WITH COMMON CALL
Q.ty Article Description
... ST 720W Studio series modular intercom
... ST 701 Single button unit
... ST 704 Additional loudspeaker
1 PRS226E Power supply-switcher
1 1473 Exchanger
... PRS210 Transformer
... RL 37 Relay module
2 PA ** Door release push-button (optional)
2 SE ** Electric door lock (12VAC-1A)
Door station series Mody
2 MD71
2 MD11
2 MD81
2 MD91*
2 MD30
Door station series Matrix
2 MA71
2 MA11P
2 MA61
2 MA91*
Door station series Profilo
2 PL71
2 PL11P
... Refers to number of users (see table).
* Rain shelters are used instead of back boxes and hood covers.
** Articles not supplied by ACI Farfisa.
Working instructions
As the basic system described on page 36, with the following variations:
- The audio functions and door lock opening are automatically switched to the door station which
has made the call and remain in this state until a call from another entrance is received.
Notes
- Do not forget to connect terminals C of the additional buttons and install the ST704 speaker
module in every intercom.
- For the connection of name-plate lamps, read notes 6 and 7 of the installation instructions on
page 35.
- For wires dimensioning refer to installation instructions and table on page 35.
- For other types of push-button panels see pages 30 and 31 or the general catalogue.
Table for choosing intercoms and accessories for the required type of installation
S
Number of inter-
T
communicating ST 720W
U
2
3
D
4
I
5
O
Module frames with back box
Module for electric door speaker
Hood cover
Rain shelter with module frames
Electric door speaker (amplifier)
Module frames with back box
Module with integrated audio amplifier
Front frame
Rain shelter with module frames
Module frames with back box
Module with audio amplifier
Studio
ST 701 ST 704
2 2 2
3 6 3
4 12 4
5 20 5
Application dia-
RL37 PRS210 gram on page:
0 0 78
0 0 78
1 1 78
1 1 65
64
(MT11 - Gb2006)
ST 720
JP2
3 2 9 1 5
0
C
P
C
P
9A 3A
ST704
P1
P2