R2-3
R2-6
R2-7
R4-1
R2-2
bk
bl
g
R8-2
g
R7-1
g
R7-2
v
R5-1
v
R5-2
L1
L3
L5
bk
R1-3
MN
Fu1
1
2
R3-6
r
R3-5
br
R3-4
a
PC
12
11
10
9
TS
R3-2
gn
R6-1
y
R6-2
v
R3-1
v
R3-3
y
R2-5
R2-4
R2-1
g
R8-1
R4-2
R4-3
r
R1-4
3
4
5
TM
R
7
6
PA
br
bl
R1-1
br
R1-2
bl
R6-4
br
R6-3
IG
L4
L1
N
S3
BR
N
PCB 1
(2)PR6
(3)PR5
TA
F
N
230Vac
50Hz
MT
L
N
bl
(1) PR1
(4) PR3
2
1
1a
2a
C
1
2
C
1
2
2
C
br
ygn
bl
bl
br
3.5.3 Topographical layout
Key to symbols:
IG:
Main switch [on the printed circuit it is indicated with “on/off”]
L1:
Low water light (optional)
L3:
Heating pump light
L4: Burner
light
L5: Overheating
light
L6:
Burner stop light (optional)
MT:
Programming clock motor (optional) [indicated with TIMER on
the PCB]
TM:
Programming clock contact (optional) [indicated with TIMER
on the PCB]
PA:
Water pressure switch [on the printed circuit it is indicated with
the water presure switch symbol]
MN: Minimum temperature thermostat (optional) [on the printed
circuit it is indicated with Tm]
TA: Room
thermostat
R:
Heating thermostat [on the printed circuit it is indicated with
Tr]
TS: Safety
thermostat
Fu1: Safety fuse type F4A 250V
BR: Burner
PC:
Heating system circulating pump
PCB1: Heating system printed circuit
Notes: (1) PR1: Remove jumper and connect PA
(2) PR6: Remove jumper and connect TM
(3) PR5: Remove jumper and connect MN
(4) PR3: Remove jumper and connect TA
14
pic. 10
