________________________________________________________________________________
85
AST 14 C 255/00
WARNING: removing the plastic front part of the interface board is not allowed (spare part is
supplied pre-assembled).
6.2 OUTER TERMINAL BOX ELECTRICAL CONNECTIONS
All the electrical connections are ensured through the terminal box located on the back
side of the electric panel. The supplementary boards (used to manage the zones or
complex solar plants) are housed outside, on the panel back side. A supplementary
terminal is housed there as well (only for RTFS version):
Supplementary
board
Supplementary
board
Electrical
Connections
Key to connections:
1-2
ambient thermostat 2
3-4
ambient thermostat 1 or Remote Control
(L
≤
30m)
5-6
external probe
(10K Ohm at 25°C B3977 L
≤
100m)
7-8
cold water inlet probe S3S for CTFS version (already connected) or
boiler water
heater probe SBC for RTFS version
(10K Ohm at 25°C B3435 L
≤
3m)
9-10
solar water heating probe SBS
(PT1000 L
≤
3m)
11-12
solar collector probe SCS
(PT1000 L
≤
100m)
13-14
ambient probe SA1
(10K Ohm at 25°C B3977 L
≤
100m)
15-16
ambient probe SA2
(10K Ohm at 25°C B3977 L
≤
100m)
17
serial connection GND
18
serial connection 485A
19
serial connection 485B
20
serial conn5V
21
“normally open” relay phase (NA)
22
“normally closed” relay phase (NC)
23
multifunction relay neutral
24-25
spring return type motorised valve (P28=0) or DHW pump (P28=1) only
for RTFS version
Warning:
in case of complex solar plants, the solar valve probe (SVS) must be
connected to the supplementary board.
Terminal 24-25
