39
WIRING DIAGRAM INOVA L20 MCS W TOP-U
NOTE:
Check that the
microswitches on selector
SW1
are as illustrated in the
diagram.
D
= Floor heating function
switch
To install the timer remove the bridge between terminals 25 and 26.
To install the room thermostats TA and TL remove the
bridges and connect up using the supplied fairlead.
D
C
B
A
ON
SW1
D
C
B
A
ON
SW1
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
BM
L
N
TA
IG
TL
P5 MAX.R
M7
26 25
27
28
29
30
31
32
33
34
M12
M10 52 51 50 49
41 39 37 35
36
38
40
42
M9
44
43
45
46
47
48
M11
M8
58 56 54
53
55
57
6
7
8
9
10
11
12
13
14
15
16
17
18
3
2
1
4
5
19
20
21
22
23
24
M6
M5
M4
M2
M1
LD1
LD30
LD40
LD50
LD60
LD70
LD80
ON
P3 TIMER
P2 RLA
VN
PF
FILTER
SYSTEM
PUMP
WATER
PRESSURE
SWITCH
HEATING
SENSOR
HOT WATER
SENSOR
HOT
WATER
PRIORITY
SUMMER
/WINTER
SWITCH
MODULATING BOARD
COD. 8.50896.0
LED + FLAT BOARD
P4 HOT
WATER
P1
HEATING
C
LEGEND
BM
Modulating coil
C
Condenser
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
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
