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Alpha CD12S/20S/28S - General Boiler Information
3.9 FLUSHING THE HEATING SYSTEM
It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha CD boiler. Failure to do
so will invalidate the warranty.
The primary condensing heat exchanger is constructed in stainless steel and therefore is compatible with most materials
used in a heating system.
If a cleaning agent and inhibitor are used, they must be applied in accordance with their manufacturers instructions. Only
products from Fernox and Sentinel are acceptable for use with the Alpha CD boilers. Further information can be obtained
from Fernox (Tel: 0870 8700362) or Sentinel (Tel: 0151 4209563).
If applicable -
Although the Cyclone is fitted in the heating return within the Premier Pack wall jig, the heating system should
still be thoroughly flushed as detailed below. The Cyclone collection point should be emptied via the drain point (see Fig. 14b)
after flushing has been completed.
The system should be flushed in accordance with BS 7593 and BS 5449. The following procedures are recommended:
1. Installing onto a new system:-
a. Fill the system, vent at high points, at pump and radiators.
b. Check for leaks.
c. Rapidly drain the system.
d. If required, chemically clean the system as instructed by the recommended cleaner manufacturer.
Note:
Ensure that the system is flushed to remove any remains of the cleaner.
e. If chemical cleaner is not used to clean the system:-
i)
Refill the system.
ii)
Switch on the boiler and allow the system to heat up to the normal operating temperature.
iii)
Rapidly drain the system while the water is still hot.
iv)
Refill the system.
f. As required, add the recommended inhibitor to the system as instructed by the inhibitor manufacturer.
g. Recheck for leaks.
2. Installing onto an existing system, clean the system before fitting the new boiler:-
a. If the old boiler is still working:-
i)
Switch on the boiler and allow the system to heat up to the normal operating temperature.
ii)
Rapidly drain the system while the water is still hot.
iii)
Refill and chemically clean the system as instructed by the recommended cleaner manufacturer.
iv)
Ensure the system is flushed to remove any remains of the cleaner.
v)
Fit the new boiler.
b. If the old boiler is not working:-
i)
Rapidly drain the system.
ii)
Remove the old boiler.
iii)
Flush the system through.
iv)
Fit the new boiler.
v)
Refill and chemically clean the system as instructed by the recommended cleaner manufacturer.
vi)
Ensure the system is flushed to remove any remains of the cleaner.
c. As required, add the recommended inhibitor to the system as instructed by the inhibitor manufacturer.
d. Check for leaks.
3.10 DISPOSAL OF CONDENSATE
Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha CD boilers and
reference should be made to BS 6798 for the requirements on the disposal of condensate.
The boilers incorporate a condensate trap which has a seal of 75 mm, therefore no additional trap is required.
The condensate should ideally be discharged internally into an internal waste pipe (washing machine/sink waste) or soil pipe
to avoid the possible risk of freezing. The pipework must be in 22 mm pipe.
External pipe runs should be avoided, but if it is necessary, the pipework should be protected from the risk of freezing with
waterproof insulation and the length should be kept to a maximum of 3 m. Alternatively the condensate pipework could be
increased to a minimum of 32 mm diameter without the requirement to insulate the pipework. Termination should be into an
external gulley or soakaway as shown in Figs. 9 and 10.
Note:
All pipework must have a continuous fall (see Figs. 9 and 10) from the boiler and must be of an acid resistant material
such as plastic waste pipe. (copper or steel is not suitable).
It should be noted that the connection of a condensate pipe to a drain may be subject to local building control requirements.
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