30
Response SE Combi -
Installation
41 EXTERNAL WIRING
INSTALLATION
Wiring External to the Boiler
WARNING
. This appliance must be efficiently earthed.
A mains supply of 230 V ~ 50 Hz is required.
The fuse rating should be 3A.
Wiring external to the boiler MUST be in accordance with the
current I.E.E. (BS.7671) Wiring Regulations and any local
regulations.
All external controls and wiring must be suitable for mains voltage.
Wiring should be 3 core PVC insulated cable, not less than 0.75
mm
2
(24 x 0.2mm).
Wiring external to the boiler MUST be in accordance with the
current wiring regulations and any local regulations.
Connection must be made in a way that allows complete isolation
of the electrical supply such as a double pole switch having a
3mm (1/8") contact separation in both poles, or a plug and socket,
serving only the boiler and system controls. The means of
isolation must be accessible to the user after installation.
1. External Single Channel Programmer
This should be wired as shown in Diagram A
2. External Two Channel Programmer
This should be wired as shown in Diagram B. The power to the
programmer should be isolated with the same switch that isolates
power to the boiler, otherwise the boiler can be left live, even
when the boiler isolating switch is off. Using a two channel
programmer will disable the heating switch.
3. Room Thermostat
It is recommended to use a room thermostat in conjunction with
the boiler to give the most efficient boiler performance and the
most comfortable central heating performance. The room
thermostat should be wired (depending on the programmer
option) as either diagram A or B.
4. Frost Protection
a.
This is provided automatically by the Gasmodul control.
If the boiler flow temperature T
1
falls below 7
o
C the
pump runs without the boiler firing until the temperature
exceeds 10
o
C
If the flow temperature falls below 3
o
C the boiler will
fire until the temperature exceeds 10
o
C.
b.
Central heating systems fitted wholly inside the house
do not normally require frost protection as the house
acts as a 'storage heater' and can normally be left at
least 24 hours without frost damage.
However, 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. Wiring should be
as shown.
Note
.
If the boiler is installed in a garage it may be necessary to
fit a pipe thermostat, preferably on the return pipework.
INST
ALLA
TION
