Danfoss CET B-RF User & Installation Instructions Manual page 19

size of boiler and the heat exchanger inside the cylinder.
The water heating will not work if a time switch or programmer
has switched it off . And the cylinder thermostat will not always
switch the boiler off , because the boiler sometimes needs to
heat the radiators.
Cylinder thermostats are usually fi tted between one quarter
and one third of the way up the cylinder. The cylinder
thermostat will have a temperature scale marked on it, and it
should be set at between 60°C and 65°C, then left to do its job.
This temperature is high enough to kill off harmful bacteria in
the water, but raising the temperature of the stored hot water
any higher will result in wasted energy and increase the risk
of scalding.
If you have a boiler control thermostat, it should always be set
to a higher temperature than that of the cylinder thermostat.
In most boilers, a single boiler thermostat controls the
temperature of water sent to both the cylinder and radiators,
although in some there are two separate boiler thermostats.
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