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Size of dis-
Valve outlet
charge pipe-
size
work D1
G1/2
15 mm
<G3>/4
22 mm
G1
28 mm
Tab. 3
Valve outlet size
7.5
HOW TO DRAIN THE HOT WATER
CYLINDER
1
2
Fig. 17
1
Mains cold water in
2
Domestic hot water out
1. Turn off the main water supply to the cylinder.
2. Open a hot water tap with a position as low as
possible in the building, in order to reduce the
pressure.
3. Remove the pipe connection 1 - Mains cold water in
and connect one end of the hose pipe to the
connection. Terminate the other end of the hose to a
drain or to outside. Ensure that the drain end of the
hose is at a lower level than the bottom of the
cylinder. The greater the fall on the hose, the higher
the flow rate.
4. Disconnect connection 2 - Domestic hot water out.
5. Start the siphon effect by pumping or sucking at the
drain end of the hose.
6. Let the whole volume drain out.
6 720 641 467 (2010/01)
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Size of dis-
Maximum length of
charge pipe-
straight pipe (no bends or
work D2
elbows)
22 mm
28 mm
35 mm
28 mm
35 mm
42 mm
35 mm
42 mm
54 mm
7.6
To flush the tank use the above proposed setup, add a
hose onto the hot water outlet position number 2 (in the
above diagram) and then flush the hot water tank.
7.7
The heat pump is a part in a heating system. Faults in the
heat pump can be caused by poor water quality in the
radiators/under floor heating or air penetrating the
system continuously.
Oxygen causes the formation of corrosion products in
the form of magnetite and deposits.
Magnetite has a grinding effect on the heating system's
pumps, valves and components with turbulent flows
6 720 641 467-77.1I
such as the condenser.
Heating systems which require regular filling or where
the heating water is not clear when drained, require
remedial measures before the installation of a heat
pump, for example the heating system must be fitted
with filters and air vents.
Do not use any water treatment additives except agents
for raising the pH level. Recommended pH value is 7.5 –
9.
The water inside the heating system must be neither
aggressive nor indicate a high chloride content. Very
high and very low pH values are not allowed.
To protect the heat pump against contamination:
B Thoroughly flush the pipework prior to connecting the
heat pump.
HEATING SYSTEM CONNECTION
Deduct the figure below
from the maximum length
for each bend or elbow in
the discharge pipe
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
Up to 9 m
Up to 18 m
Up to 27 m
HOW TO FLUSH THE SYSTEM & TANK
FLUSHING THE HEATING SYSTEM
0.8 m
1.0 m
1.4 m
1.0 m
1.4 m
1.7 m
1.4 m
1.7 m
2.3 m
17
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