Alpha InTec2 26CE Installation And Servicing Instructions page 14

3.9 FLUSHING THE HEATING SYSTEM
It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha boiler. Failure to do so
will invalidate the warranty.
The primary condensing heat exchanger is constructed in aluminium and therefore is compatible with most materials used in
a heating system.
Cleaning agents and inhibitors must be applied in accordance with their manufacturers instructions. Suitably approved
products for cleaning and treatment must be used.
The system should be flushed in accordance with BS 7593 and BS EN 14336. The following procedures are recommended:
1. Installing onto a new system:-
a. Fill the system, vent at high points, at pump, primary heat exchanger and radiators.
b. Check for leaks.
c. Drain the system.
d. 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) Switch off the boiler and drain the system while the water is still hot.
iv) Refill the system and check for leaks.
f. Add the inhibitor to the system as instructed by the inhibitor manufacturer instructions.
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) Switch off the boiler and drain the system while the water is still hot.
iii) Refill and chemically clean the system as instructed by the cleaner manufacturer instructions.
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) 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 cleaner manufacturer instructions.
vi) Ensure the system is flushed to remove any remains of the cleaner and check for leaks.
c. Add the inhibitor to the system as instructed by the inhibitor manufacturer instructions.
The system inhibitor level must be maintained at the correct concentration. The PH of the system water must be between 6.5
and 8.5 or the appliance guarantee will be invalidated.
The system must not be filled with softened water.
3.10 DISPOSAL OF CONDENSATE
Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha 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 greater than 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 (minimum).
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 and the condensate pipework should be increased
to a minimum of 32 mm diameter. Termination should be into an external gulley or soakaway as shown in Figs. 3.7 and 3.8.
Note: All pipework must have a continuous fall (see Figs. 3.7 and 3.8) from the boiler and must be of an acid resistant
material such as plastic waste pipe. (copper or steel is not suitable).
The condensate pipe is combined with the expansion relief discharge. The flexible condensate hose supplied meets the
requirements for use with both condensate and expansion relief. This should be connected to a suitable waste pipe and
fittings with approval for hot and cold water, i.e. BS EN1451-1PP Waste piping, BS EN1455-1 ABS piping or BS EN 1566-1
MUPVC piping.
The condensate and discharge should be connected to a drain for sewage and foul waste or a dedicated soak away with
neutraliser added.
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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Alpha InTec² 26E, 30CE and 35CE - General Boiler Information