37
LEGEND
BM
Modulating coil
CA
Ignition control unit
CO
Heating programming timer
contact (if any)
CO1
Hot water programming
timer contact (if any)
EC
Control electrode
EI
Summer/winter switch
ES
Spark electrode
IG
Main switch
L
Line
MP
Hot water priority micro
pressure switch
MAX.R.
Max. heating adjustment
PRINCIPLE DIAGRAM INOVA L20 MCS W TOP-U
N
Neutral
OR
Programming timer (on
request)
P
System circulating pump
PF
Fumes pressure switch
PR
Reset button
Ph
2
O
Lack of water pressure
switch
P.RI
Heating potentiometer
P.SA
Hot water potentiometer
RLA
RLA power adjustment
RT
Relay contact
RS
Relay contact
RP
Relay contact
SR
Heating sensor
SS
Hot water/cylinder sensor
SF
Operation indicator
SB
Lock-out warning light
SW1
Function selector
TA
Room thermostat (if any)
TIMER
Boiler timer adjustment
TR1
Transformer
TST
Total safety thermostat
TL
Limit thermostat (if any)
TF
Fume thermostat
VG
Gas valve
VN
Fan
VDR
Variator
N
4
2
OR
Fuse
L
IG
5
1
3
VDR
17
P
18
RP
C2
R3
RS
14
15
13
RT
R4
16
R2
C1
6
8
7
PTC
P.RI
P.SA
RLA
MAX.R.
TIMER
SS
SR
49
50
51
52
SW1
A B C D
REGOLATORE ELETTRONICO
BM
34
33 32
31
TA
EI
I
30
29
E
Ph
2
O
48
47 46
45
TL
44
43
SAN.
MPS
RISC.
28
27
CO1
26
25
CO
ON
80
°
70
°
60
°
50
°
40
°
30
°
Termometro a LED
TR1
RP
RT
RS
9
10
11
12
J4
SB
PR
TST
J1
J2
J3
L N R AL RES L L
1 2 3 4 5 6 7
PNC PNO PC FAN N
8
9 10 11 12
N TS TS GV
13 14 15
EC
ES
N TS TS GV
19 18 17 16
J5
MT2
MT1
J6
ION
VG
CA
VN
PF
LED thermometer
ELECTRONIC REGULATOR
