Function check
6 720 645 504 (2011/04) en
102
19 Function check
19.1 Refrigerant circuit
When the heat pump starts and there are quick changes
in temperature, bubbles may become visible in the sight
glass Fig. 54.
Fig. 54
In the event of constant formation of bubbles:
B Contact reseller/service.
19.2 Filling pressure in collector circuit
B Check the filling pressure in the collector circuit.
If the filling pressure is lower than 1 bar:
B Fill up collector circuit fluid
( Chapter 10.1).
19.3 Setting heating system operating
pressure
B Fill up until required pressure is reached, depending
on the height of the property.
B If there is a pressure drop: check the expansion vessel
and heating system for leaks.
The refrigerant circuit is hermetically sealed
and the amount of refrigerant is less than 6
kg. Therefore there is no requirement for a
yearly function check of the circuit (EC No
842/2006).
The refrigerant circuit may be opened only
by authorised service engineers.
DANGER: Risk of toxic fumes!
The refrigerant circuit contains substances
which, when released or exposed to open
fire, can form toxic fumes. The fumes block
the airways even at low concentrations.
B If the refrigerant circuit is not air-tight,
the room must be vacated immediately
and properly aired.
6 720 614 366-32.1I
Indication on pressure gauge
1 bar Minimum system pressure (when
cold).
4 bar Maximum filling pressure at max. tem-
perature of the heating water: may not
be exceeded (safety valve opens).
Tab. 197Operating pressure
Fill the hose with water before topping up
the heating system. This will prevent air
getting into the central heating system.
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