OPTIONAL CONTROLS
TR05A153.B1107
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7 OPTIONAL CONTROLS
7.1 External controls, programmers and room thermostats
All external controls used with this appliance MUST BE ZERO-VOLT SWITCHING ONLY!
If mains voltage, i.e. a switched live, is fed to the control terminals THE APPLIANCE WILL NOT
FUNCTION and could be SEVERELY DAMAGED!
7.1.1 Appliance connections
To fit a programmer, room thermostat or other external controls:
•
Isolate the electricity, water and gas supplies to the appliance;
•
Remove the front casing panel of the boiler (refer to 6.3 for guidance);
•
Remove terminal block cover
A
of the control panel (see Figure 57);
•
Remove the link
between the two terminals marked
Ta
on terminal block
B
(see Figure 57);
•
Connect the two wires from the programmer, room thermostat or controls to the terminals marked
Ta
;
•
Replace terminal block cover
A
.
External Controls:
- Room thermostat
- Programmer
A
- S-Plan system
S
e
S
e
T
a
N
L
B
T
a
Figure 57: Connection of external controls
