30
Installation and Servicing
Section 2 - Installation
INST
ALLA
TION
Installer Connections (LHS)
Installer Connections (RHS)
2.25
INSTALLER WIRING - CONTINUED
When making the mains electrical connections to the boiler it is important that the wires are prepared in such a way that the
earth conductor is longer than the current carrying conductors, such that if the cord anchorage should slip, the current carrying
conductors become taut before the earthing conductor.
COMBI
HEA
T / SYSTEM
SL1
IN OUT
IN OUT
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
COMBI
HEA
T / SYSTEM
SL1
L
IN
L
IN
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
3G9503b
L N
CH
ON
HW
ON
R/S
ON
HW
OFF
C/S
ON
Earths are not shown
for clarity but must
never be omitted.
Frost Protection
If parts of the pipework run outside the house or if the
boiler will be left off for more than a day or so then a frost
thermostat should be wired into the system.
The frost thermostat should be sited in a cold place but
where it can sense heat from the system.
Note
.
If the boiler is installed in a garage it may be
necessary to fit a pipe thermostat, preferably on the return
pipework.
Pump Overrun
Logic Heat
2
boilers do not have an integral pump and
depend on a system pump for water circulation. There are
occasional overheat lockout issues due to having no pump
overrun, when fitted on systems which do not allow natural
circulation to dissipate any excess residual heat.
Overheat lockout issues typically occur when the flow and
return pipes do not have a sufficient vertical length from the
boiler, but turn 90˚ and run horizontally close to the top of the
boiler.
A pump overrun kit (221795) is available to provide extra
protection from overheating and is recommended on
systems most at risk.
This pump overrun kit contains a capacitor which allows the
water to circulate through the boiler 4 minutes after the boiler
is switched off. This process will remove residual heat that
may otherwise trip the overheat thermostat.
OPEN THERM./
WEATHER COMP.
B
Содержание LOGIC HEAT2 H12
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