USER INSTRUCTIONS
CONDENSING BOILOES WITH STORAGE - TG05A095.A0306
46
6.5 Draining the central heating and the domestic hot water systems
D
RAINING THE CENTRAL HEATING SYSTEM
If the need arises to drain the system, this
can be done as follows:
•
Switch the system to “WINTER” mode
and ignite the boiler.
•
Switch off the power supply to the boiler.
•
Wait for the boiler to cool down.
•
Connect a hosepipe to the system drain
point and locate the other end of the hose
in a suitable drainage system.
•
Open the system drain valve (fig. 1).
•
Open the air vents on the radiators,
starting with the highest and moving
down the system to the lowest.
•
When the system has been drained,
close the radiator breather valves and the
drain valve.
•
If only the boiler needs to be drained,
close the flow/return isolating valves
on the heating circuit and open the
drain valve located at the bottom of
the boiler on the pump manifold.
D
RAINING THE DOMESTIC HOT WATER SYSTEM
If there is a danger of freezing, the domestic
hot water system should be drained. This can
be done as follows:
•
Shut off the water at the mains;
•
Open all the hot and cold water taps.
•
Empty from the lowest point (where
possible).
•
On completion, close all the previously
opened taps.
■
Excluding the automatic Bypass
All models fitted with the
Multiplex
®
system have an automatic bypass system fitted as standard. The system is
necessary in the case where two-way zone valves are installed or thermostatic valves are mounted on the
radiators.
In the fully open condition (fig. 2, pos B), the system guarantees the maximum operating flow.
If need be, however, the bypass can be excluded as follows:
•
Switch off the boiler by placing the switch in the
OFF
position.
•
Rotate the screw on the bypass from position
B
to position
A
.
N.B. THE BOILER LEAVES THE FACTORY WITH THE BYPASS SET IN THE CLOSED POSITION
(POSITION A).
Fig. 1
A
B
Fig. 2
Fig. 4
Summary of Contents for RKA 25
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