Technical data

13
3.9 FLUSHING THE HEATING SYSTEM
It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha InTec 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 InTec boilers. Further information can be obtained
from Fernox (Tel: [phone]) or Sentinel (Tel: [phone]).
If the Cyclone is fitted in the heating return on the 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. 13b) after flushing has been completed.
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. 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) Switch off the boiler and drain the system while the water is still hot.
iv) Refill the system and check for leaks.
f. As required, add the recommended inhibitor to the system as instructed by the inhibitor manufacturer.
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 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) 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 and check for leaks.
c. As required, add the recommended inhibitor to the system as instructed by the inhibitor manufacturer.
3.10 DISPOSAL OF CONDENSATE
Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha InTec 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 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. 8 and 9.
Note: All pipework must have a continuous fall (see Figs. 8 and 9) 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.
Optional Condensate Trace Heating Kit
An optional Alpha InTec trace heating kit is also available to prevent the condensate from freezing.
The control of this kit works with a unique patented design using the boiler PCB to control the trace heating. The outside
weather probe measures the external temperature, activating the trace heating cable only when the boiler is in operation
and producing condensate. This feature together with the latest technology variable resistance heating cable ensures only a
small amount of electrical energy is used.
If the external temperature drops below 2°C and the boiler is on, the relay PCB is operated and voltage is supplied to the
trace heating wire causing it to heat up and prevent the condensate from freezing. When the outside temperature rises to
4°C or the boiler pump stops, the trace heater is switched off. The connection of the outside weather probe supplied with this
kit also enables the weather compensation feature on the boiler.
Alpha InTec C and X - General Boiler Information