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System 2A:
with 1 tank, 1 circulating pump and 3 probes.
(Self-regulating circulating pump, No metering, With additional heating).
- Assigning of terminals and block diagram.
P1
Symbol Description
S2 (B) Lower tank NTC probe
S3 (C) Solar collector PT1000 probe
P1 Solar circulating pump
AUX 2 Closes in case of fault
AUX 1 Closes shutter
S1 (D) Upper tank PT1000 probe
1
2
3
NTC
B
4
5
PT1000
C
6
7
PT1000
D
8
9
10
11
12
FREE
CONTACT
S3
M Bi B N
256
cod. 3540V011 - 03/2017 (Rev. 00)
25
230 Vac
50 Hz
24
23
L
AUX 2
(230 Vac)
22
N
21
20
R
19
18
17
L
AUX 1
(230 Vac)
16
N
NC
15
14
COM
FREE CONTACT
13
NO
S1
S2
Symbol Description
256 The contacts must not be connected and must
be suitably protected
R Relay
F Fuse
Necessary
Optional
ECOTRONIC tech
L
N
F
NA
NC
C
M
B G/V
T1
129
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