Flush The System; Fill The System - Alpha InTec 50CS Installation, User And Servicing Instructions

22mm termination from boiler, increase to 32 mm if external
100mm plastic tube
Bottom of tube sealed

1.12 FLUSH THE 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.
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: 0870 870 0362) or Sentinel (Tel: 0151 420
9563).
The system should be flushed in accordance
with BS 7593 and BS EN 14336. The following
procedures are recommended:
- Installing onto a new system:-
Fill the system, vent at automatic air vents
and radiators.
Check for leaks.
Drain the system.
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.
If chemical cleaner is not used to clean the
system:-
a Refill the system.
b Switch on the boiler and allow the
system to heat up to the normal
operating temperature.
c Switch off the boiler and drain the
system while the water is still hot.
d Refill the system and check for leaks.
As required, add the recommended inhibitor
to the system as instructed by the
inhibitor manufacturer.
Alpha Intec 50CS
Cement mortar sealing
500 mm min.
Soakaway depth 400mm
filled with limestone chippings
- Installing onto an existing system, clean the
system before fitting the new boiler:-
If the old boiler is still working:-
a Switch on the boiler and allow the
system to heat up to the normal
operating temperature.
b Switch off the boiler and drain the
system while the water is still hot.
c Refill and chemically clean the system
as instructed by the recommended
cleaner manufacturer.
d Ensure the system is flushed to remove
any remains of the cleaner.
e Fit the new boiler.
If the old boiler is not working:-
a Drain the system.
b Remove the old boiler.
c Flush the system through.
d Fit the new boiler.
e Refill and chemically clean the system
as instructed by the recommended
cleaner manufacturer.
f Ensure the system is flushed to remove
any remains of the cleaner and check
for leaks.
As required, add the recommended inhibitor
to the system as instructed by the
inhibitor manufacturer.
Ground level (either/or)
O
2½ fall
25mm
300mm
Two rows of 3 x 12mm
holes at 25mm centres,
50mm from the bottom
of the tube. Holes to face
away from house.

1.13 FILL THE SYSTEM.

The boiler is fitted with two automatic air vents
(see Fig. 1.18), ensure that the vents are always
open.
Open the central heating flow and return valves.
Open the fill point valves on the filling loop until
water is heard to flow.
To remove the air - Vent each radiator in turn,
starting with the lowest in the system.
It is important that the pumps are properly
vented to avoid them running dry and damaging
the bearings. Unscrew and remove the cap
from the centre of the pump. Using a suitable
screwdriver rotate the exposed spindle about
half a turn, then replace the cap.
Check the operation of the pressure relief valve
(see Fig. 1.18) by turning the head anti-clockwise
until it clicks. The click is the valve lifting off its
seat allowing water to escape from the system -
check that this is actually happening.
Continue to fill the system until the pressure
gauge indicates 1.0 bar. Close the fill point valve
and check the system for water soundness,
rectifying where necessary. Disconnect the filling
loop from the mains supply.
Water may be released from the system by
manually opening the drain point (see Fig. 1.18)
until the system design pressure is obtained. The
system design pressure (cold) should be between
0.75 and 1.25 bar.
Open the cold water mains inlet valve (see Fig.
1.18). Turn on all hot water taps and allow water
to flow until no air is present. Turn off taps.
Ensure that the condensate trap has been filled
with water. Refer to Section 1.11.
12
Fig. 1-17