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Fig. 2.
The control knob has a range of adjustment as
indicated by the symbols.
6
TO SWITCH OFF YOUR
BOILER
During normal operation your boiler can be switched off at
the programmer, where fitted. A frost thermostat is fitted as
standard to protect the boiler only in frost conditions. If there is a
possibility the central heating /hot water system may be exposed to
frost conditions, an additional frost thermostat should be fitted.
Consult your installer if you are unsure! The boiler should remain
connected to the mains power supply to enable the boiler to
operate in the event of a frost condition.
In the event you have to switch off your boiler for long
periods, turn off the mains electricity at the isolator switch within
the property and drain the boiler and heating system.
TEMPERATURE CONTROL
The temperature control knob gives you control over the
water temperature in your central heating radiators, and
can be adjusted to any position within the indicated range
(as shown in Fig. 2).
Higher settings obviously mean hotter radiators and
rooms will reach the required temperature quicker. The
ideal setting varies from property to property, and can only
be established by trial and error and experience: a setting
of medium to high should serve as a good initial guide.
below the first indicating bar
HIGH-LIMIT THERMOSTAT
Your boiler is fitted with two high limit thermostats to protect
the appliance in the event of a control or system malfunction. The
first overheat thermostat is designed to cut out at a lower
temperature than the manual reset overheat thermostat, and will
reset itself when the boiler cools to a safe operating level.
The manual reset thermostat will operate if the boiler reaches
an excessively high temperature. This will have to be reset by
PLEASE NOTE: The control knob must not be set
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