Bosch Worcester Greenstar 24 User Instructions page 28

Glossary
Pluming and Condensate drain
This is a condensing boiler and the flue terminal will, at times give out a plume of
water vapour. This is quite normal.
The boiler produces condensate which is discharged regularly by a syphon within the
boiler via a plastic pipe to a drain. This pipe must not be blocked or altered in any
way.
Room thermostat / programmer
A room thermostat / programmer must be fitted to control the central heating. This
controls the times and temperatures of the central heating, preventing the boiler
from firing unnecessarily. Refer to the instructions supplied with the thermostat and
programmer for further information.
Thermostatic radiator valves
Thermostatic radiator valves must be fitted in sleeping accommodation. It is
recommended that this type of valve is fitted to all but one of the radiators. The
remaining radiator, where the room thermostat is located, must be uncontrolled and
left open.
Pump over run function
After the boiler has finished a demand for central heating or hot water, the pump may
continue to run for a short while to dissipate the heat from within the boiler.
Pump anti-seizure
If there has been no heating demand for 24 hours the boiler will run the system pump
for a few seconds to reduce the possibility of pump seizure during long periods of
inactivity.
SEDBUK
Seasonal Efficiency of Domestic Boilers in the UK.
28 6 720 811 923 (2014/07)