Technical data

© Baxi Heating UK Ltd 2010
31
Fig. 40
Typical System Wiring
NC
C
Room
stat
Cyl
stat
NO
C
N
NC
N
HW on
E
HW off
L
CH on
Pump
Mains
This Appliance must be Earthed
N
N
L
EESwL
L
Optional external programmer
Fused 3A Mains Supply
Frost stat
Typical wiring centre 12 way shown
Mid position valve
br
b
g/y
br
b
g/y
Pump supplied from boiler
7894105
E
NL
17283941056
6
11
11
12
12
Typical System Wiring - mid position valve (Y Plan) External Programmer Mains supply direct to wiring centre The Pump can be wired through the wiring centre but must be wired direct to Pump L, N & Earth on boiler terminal block.
b - blue br - brown g/y - green yellow
Boiler PCB
NC
C
N
HW on
E
HW off
L
CH on
Pump
Mains
This Appliance must be Earthed
N
N
L
EESwL
L
7894105
E
NL
17283941056
6
11
11
12
12
Optional external programmer
Fused 3A Mains Supply
Frost stat
Not used
Typical wiring centre 12 way shown
Room
stat
Cyl
stat
CH Zone valve
DHW Zone valve
NO
C
br
br
b
b
g/y
g/y
Pump supplied from boiler
N
NC
Typical System Wiring - two zone valves (S Plan) External Programmer The Pump can be wired through the wiring centre but must be wired direct to Pump L, N & Earth on boiler terminal block.
b - blue br - brown g/y - green yellow
Boiler PCB