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9.2
Heating system
Expansion tank
Select expansion vessel in accordance with EN 12828.
It is important when installing the expansion vessel to
position it at the highest point in the circuit, preferably
above the heat pump. If there is a low ceiling making it
impossible to fit the tank above the pump, it can be
Fig. 20 Installing the expansion vessel
Particle filter (integrated in E6 - 17)
A particle filter for the heating system is included in the
delivery of C6 - 11 and should be installed on the
connection for the heating system's return line.
Heat carrier pump
Factory setting for the heat carrier pump is ext. in (
Image 21). The factory setting (ext. in) on the heat
carrier pump must not be changed using the dial, the
pump settings are controlled from the control unit.
Fig. 21
6 720 643 409 (2010/03)
ext. in
min
min
max
max
6 720 641 855-33. 1I
positioned as illustrated in the figure to the left. It is
important to install the tank so that any air disappears
upwards. Air will remain in the circuit if the tank is fitted
incorrectly (see the figure to the right).
Safety thermostat
In certain countries, a safety thermostat must be
installed in the under floor heating circuits. The safety
thermostat is connected to the external input (
Image 48) for the circuit and Block heatingset to
Yes(
15.6).
Galvanized radiators and pipes
To prevent the formation of gas in the heating system,
never use galvanised radiators or pipework.
Propylene glycol
Glycol is not normally used in the heating system. In
special cases, where increased protection is required,
glycol can be added with a maximum concentration of
15%. Heat pump performance will however decrease.
WARNING:
B Alcohol based anti-freeze must not be
used in the heating system.
Safety valve
Pursuant to EN 12828, a safety valve should be used.
The safety valve should be installed vertically.
WARNING:
B Never block the safety valve outlet.
Installation
6 720 641 855-06.1I
29
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