Figure 11.7: internal boiler wiring – Crown Boiler MWC116ENL User Manual
Page 52
50
ye bk wh gy bu
rd
bk
gy
gy
gy
M
t
COM
NO
COM
NO
NC
bk
bu
bn
rd
gnye
gy
wh
bu
rd
bk
bu
wh
gy
bu
gnye
bk bk
u
b
e
y
n
g
y
g
bk
bk
bu
bu
bu
bu
rd
bk
y
g
y
g
L
N
rd
bu bn
gnye
gnye
gnye
bu
bn
bu
rd
gnye
wh
gy
rd
bk
bu
bn
gy
ye
wh
bu
rd
bk
rd
Caution: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing
Flue
thermostat
Safety
thermostat
Air pressure
switch
Ignition
electrodes
Flame detection
electrode
Fan
Electric supply
terminal block
External controls
terminal block
3 2 1
Prmary circuit
flow switch
Pump
Gas valve
C.h. temperature
probe NTC
bn - brown
bu - blue
bk - black
gn - green
gnye - green / yellow
gy - grey
or - orange
rd - red
wh - white
vt - violet
ye - yellow
or
rd rd
t
rd
wh
bu
bk
rd
wh bk rd
~
3
1
2
wh
**D.h.w.
**
flow switch
**D.h.w.
**
NTC
**Three way
**
diverter valve
rd
rd
rd
wh
bu
wh
wh
or
~
M
M
~
*--- directly connected to the electronic ignition board
** - Not for model c.h. only
Figure 11.7: Internal Boiler Wiring