Function check
6 720 643 409 (2010/03)
95
18 Function check
18.1 Refrigerant circuit
When the heat pump starts and there are quick changes
in temperature, bubbles may become visible in the sight
glass Æ Image 61..
Fig. 61
In the event of constant formation of bubbles:
B Contact a service representative.
18.2 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
(Æ Chapter 9.13).
18.3 Setting heating system operating
pressure
B If the pointer is below 1 bar (when the system is
cold), top up with water to the system until the
pointer is between 1 bar and 2 bar again.
B If there is a pressure drop: check the expansion vessel
and heating system for leaks.
The refrigerant circuit may only be opened
by authorised service engineers with
refrigeration authorisation.
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.
6 720 641 855-09.1I
CAUTION: The heat pump can be damaged.
B Fill with hot water only when the heat
pump is cold.
Pressure gauge reading
1 bar Minimum system pressure (when cold)
1 - 2 bar Optimum system pressure
3 bar Maximum system pressure at maximum
central heating system temperature:
must not be exceeded (safety valve
opens).
Tab. 191
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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