growth of bacteria in the system. Filling is carried out
through the expansion tank, either manually or with the
aid of Alde’s lling pump. This pump both lls and bleeds
the system. If the system is lled manually, slowly pour
the liquid until the level is approximately
1 cm over the MIN-line in the tank. Bleed the system.
Rell if the level has fallen during bleeding. A newly lled
heating system should be bled at regular intervals during
the rst few days of operation.
CONNECTION TO HOT WATER 4.
HEATER
(Applies only if a water heater is tted)
In order for the water heater to work, it must be connect-
ed to the fresh water system. From the heater, the hot
water hose should run to the shower, thermostat mixer,
sink, etc. On the water heater, connections 1/4"R should
be used. P.T.F.E. tape or similar should be used a thread
of connections to avoid leakage.
The fresh water connections are located on the rear of
the heater. Incoming water at the bottom and outgoing
water at the top. So that the fresh water can be easily
drained off when the heater is not in use, a drain cock
should be tted to the incoming connection and an air
screw on the outgoing connection.
Fig 15
Air screwA.
Hot waterB.
Water heaterC.
Cold waterD.
Drain cockE.
INSTALLATION INSPECTION5.
The LP gas system:
After installation or service, always test the LP gas •
installation under pressure following currently valid
regulations.
If a leak is present, nd the leak using leak detection •
spray or soapy water.
• Note: open ames must not be used during leak
localisation.
Check that the reduction valve is at the right pressure.•
We recommend the mounting of an Alde LP gas leakage
tester in order to further increase safety. The tester is
mounted closest to the reducing valve and enables you
to test that the system does not leak by simply pushing
a button.
The heating system:
The heating system should be tested for leaks when •
the complete system is visible, that is, before any t-
tings are mounted. Two methods are possible: either
test pressurisation at 0.75 - 1.0 bar for 15 minutes,
followed by reduction of the pressure to a maximum
of 0.05 bar; or by lling the system with liquid and
checking by inspection. No leakage of liquid can be
accepted.
Check that all hose clips are tted and correctly •
placed.
Other points:
Check that the drainage tubes and the bleed tube on •
the expansion tank are not blocked, and check that the
drainage tap on the water heater (if mounted) is not
blocked.
Check that the circulation pump rotates in the correct •
direction (anticlockwise) at the rubber connection.
Check that the chimney and the chimney pipe are •
correctly placed and securely attached, and check that
the input tube on the Comfort 2928 is mounted on both
chimney and boiler.
Check that air can pass freely through the ventilation •
drum.
