26
UK
VE
FR
PR
Tm
LS
N
PB
SC
TC-TA
B4
T2 T1
L1
S3
N
CO
H
Z
N
N
L
IG
F
TS
M
MB
FA
TR
1 2 2 2 3 4 5 6 7 8 9 10 11 12
MA
FOCUS PRO 3R - FOCUS PRO 6R
Key
CO
Hour-meter
F
Fuse
FA
Anti-interference filter
FR
Photoresistance
IG
Main switch
LS
Safety lamp
MA
Control box
MB
Burner motor
PB
Burner connector
PR
Preheater
SC
Plug
TA-TC
Boiler environment thermostat
TR
Ignition transformer
TS
Safety thermostat
Tm
Min. pr thermostat
VE
Electromagnetic valve