www.johnsonandstarley.co.uk
17
Fig.3-18
Functional Flow Diagram
CH
FL
OW
THERMISTOR
CH
RETURN
THERMISTOR
FL
UE
SENSOR
FLAME
DETECTION
ELECTRODE
IGNITION
ELECTRODE
OTC
OTC
OPEN
THERM
GAS
V
A
L
V
E
MAINS
SWITCH
PUMP
FA
N
SYSTEM
PRES
SURE
SENSOR
MMI
CVBC
pwm
in
from
CVBC
tacho
from
CVBC
r
r
g/y
g/y
g/y
g/y
b
br
bk
bk
b
bk
y
r
r
y
b
r
g/y
E
b
N
br
L
p
p
b
br
br
r
b
b
pk
gy
gy
b
br
b
b
r
r
WIRE
COL
OUR
CODE
br
-
brown
p
-
purple
b
-
blue
pk
-
pink
bk
-
black
y
-
yellow
r
-
red
g/y
-
green/yellow
gy
-
grey