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6.0 System Details
13
© Baxi Heating UK Ltd 2011
6.6 System Controls & Wiring
This boiler requires a permanent live for
operation of the condensate pump and frost
protection.
1. To comply with Part L1 of the Building Regulations the
heating system into which the boiler is installed should
include the following:
a) zone controls
b) timing controls
c) boiler control interlocks
2. Such a system needs to be fully pumped and must
provide independent temperature and time control to
both the heating and hot water circuits and have a boiler
and system pump interlock.
3. The boiler should be controlled so that it operates on
demand only. Where it is proposed to effect control by
thermostatic radiator valves a room thermostat should
also be provided to switch off the boiler when there is
no demand for heating.
Y Plan
Diverter
Valve
Cylinder
Stat
Room
Stat
Boiler Connection
(4 Core Wire)
Pump
Timer
230V
50Hz
LNE
L
N
CH on
HW on
HW off
LNE
S/L NE
b
g/y
w
o
gr
1
C2
P/L
System Control
Wiring Centre
g/y
S Plan
Valve
Cylinder
Stat
Room
Stat
Boiler Connection
(4 Core Wire)
Pump
Timer
230V
50Hz
LNE
L
N
CH on
HW on
LNE
S/L NE
Motor
S Plan
Valve
Motor
o
o
gr
b
g/y
b
gr
br
br
P/L
System Control
Wiring Centre
Y Plan, Room Thermostat System, CH Interlocked By Room Thermostat,
DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d
Pump run from Switched Live
S Plan, Room Thermostat System, CH Interlocked By Room Thermostat,
DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d
Pump run from Switched Live
Key to colours
b-Blue
br - Brown
w-White
o - Orange
gr - Grey
g/y - Green/Yellow