52
r
NTC
NTC
Circ. 2
NTC
NTC
10 9
12
Circ.2
11
15 14
Input
16
Com.
17
24V
Bu
s
13
Analogic
Pump
6
23
22
21
20
27
25
24
26
0
Valv.Mix
OFF
Alarm
ON
Pump 3
Pump
18
19
2
1
2
3
1
J9
2
3
4
5
J10
1
J8
28
7
6
8
1
2
4
5
3
8
9
Once the maintenance operations are complete, refit the
components working in the opposite direction of what was
described.
Accessing the Slave cards
- open the two front doors in the casing and access
the inside of the control panel (see the previously de-
scribed steps)
- remove the screws (V) and then the upper cover (10)
of the Slave card relative to the first heating element.
To access the other Slave cards, repeat the same op-
eration, referring to covers (11), (12) or (13)
- for possible substitutions, remove the card's wiring
connectors and unscrew the fastening screws to re-
move it.
b
If replacing the Slave card, refer to the wiring diagram
when restoring the connections.
V
10
11
12
13
Once the maintenance operations are complete, refit the
components working in the opposite direction of what was
described.
Disassembling the circulator
- open the two front doors in the casing
- disconnect the electric power supply connector
close the delivery and return taps for the heating element
(ref. 16-27 of the "Structure" chapter)
empty the heating element as described in the "System fill-
ing and emptying" chapter
loosen the upper and lower ring nuts (14) and remove the
circulator (15).
14
Once the maintenance operations are complete, refit the
components working in the opposite direction of what was
described.
Disassembling the fan
- open the two front doors in the casing
- disconnect the wiring (16) of the fan (17)
- unscrew the two screws (19) that fix the fan (17) to the
air conveyor (20)
- use a box spanner to unscrew the four screws (18)
that fix the fan (17) to the exchanger
- remove the fan (17).
17
18
19
20
16
Once the maintenance operations are complete, refit the
components working in the opposite direction of what was
described.
b
Check that the gas connection is leak proof.