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Worcester-Bosch Greenstar CDi Classic 2015-2023 Manual

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General notes
GREENSTAR CDi CLASSIC ErP – 6 720 815 728 (2015/05)
4.4 EXTREME COLD WEATHER
In some instances where the condensate pipe work is run
externally or in an unheated area, such as a garage, the
condensate pipe work can be at risk of freezing, even if well
insulated.
A frozen/blocked condensate pipe will cause the boiler to shut
down.
If the condensate pipe has frozen:
▶ Locate the blockage.
It is likely that the pipe is frozen at the most exposed point
outside the building or where there is an obstruction to
flow.
This could be the open end of the pipe, at a bend or elbow,
or where there is a sag in the pipe in which condensate can
collect.
The location of the blockage should be identified as closely
as possible before taking further action.
▶ Thaw the frozen pipe.
The pipe can be thawed by applying a hot water bottle, a
microwaveable heating pack (the sort used for muscular
aches and pains) or a cloth soaked in hot water to the
exterior of the pipe, close to the point of blockage.
Hot water, but not boiling, can also be poured onto the pipe
from a watering can or similar container.
▶ Once the pipe has been thawed the boiler must be reset,
press the reset button for five seconds and wait two to
three minutes for the boiler to restart.
▶ If the boiler does not restart, contact Worcester, Bosch
Group Appointments Team on:
0330 123 9559.
▶ Contact your installer in order to find a permanent solution
to the problem.
5 GENERAL NOTES
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 also produces quantities of condensate which is
discharged regularly via a pipe to drain. This pipe must not be
blocked or altered in any way.
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.
This is usually more frequent during the summer months.
CLEARANCES
Your installer will have provided adequate space around the
boiler for safety and servicing access.
Fig. 12
* 600 mm service clearance required to a fixed surface
** 20 mm from removable door or panel
▶ Do not restrict this space with the addition of cupboards,
shelves etc. around or next to the boiler.
WARNING: Falling hazard!
Failure to follow this guidance may result in
personal injury.
▶ Only attempt to thaw a condense pipe that
is at ground level, and that is easily
accessible.
▶ Never attempt to thaw a condense pipe
that is at height.
CAUTION: Pipe damage
▶DO NOT use boiling water to thaw the
condensate pipe!
… 17 …


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