2
9
F
ig
. n
o
.2
0
C
o
n
n
e
c
tio
n
d
ia
g
ra
m
–
P
u
m
p
h
e
a
tin
g
c
ir
c
u
it
IN
L
E
T
SERVICE
BOX
SERVICE
BOX
BT1
SAFETY THERMOSTAT
M2
VENTILATOR SUPPLY
M2
PWM
VENTILATOR SPEED REGULATION
M1
FUEL FEEDER
Q1
BOILER PUMP
Y3
HW THREE-WAY VALVE
B3
HW TEMPERATURE
B2
BOILER OUTLET TEMPERATURE
B5
FUEL FEEDER TEMPERATURE
B9
OUTSIDE TEMPERATURE
A6
ROOM DEVICE
TB
MOTOR THERMAL PROTECTION
SERVICE
BOX
SERVICE
BOX
Color of conduit:
BK
Black
BN
Brown
BU
Blue
GNYE
Green-yellow
GREY
Grey
WHITE White
YELOW Yellow
RED
Red
SERVICE
BOX