14
Super Plus -
Installation and Servicing
SP8321
v
r
INSTALLATION
INST
ALLA
TION
Fig.15 Boiler Module Internal Wiring
NOTES
1.
Isolate mains supply to boiler. All
incoming earth connections must first be
made to the earthing post and terminal
block inside the wiring centre casing.
2.
Terminals S1, S2 and S3 provide facility
for direct wiring of safety devices. The
water flow switch should be connected
between S1 and S2, and any other
safety devices wired in series between
S2 and S3. (Typical safety devices are:
Air pressure switches, auxiliary switches
on motorised valves, and safety relays
activated by fire sensors). Terminal S2
is voltage free.
If no other safety devices are to be
used, the water flow switch should
be connected across S1 and S3. If all
overriding safety devices are wired in
series with the isolation mains supply
to the boiler then link terminals S1-S3.
The neutral connection must be taken
from the installers junction box.
3.
These connections provide a 230 Volt
AC supply outlet for remote indicators
and alarms with a maximum lead of 1
Ampere resistive.
O/H: becomes live when the
module overheat cutoff device has
operated.
L/O: becomes live when the
module has gone to lockout.
B/O: becomes live when the
module is running.
Note:
200/S does not employ PCB 10
Note*:
The installer must make these
connections for each module.
Fig.14 Wiring for Boilers with a Wiring Centre
