Checking The Operating Pressure (Sealed Systems); Checking The Fill Level (Open Systems) - Bosch UNI 7000 F Installation And Servicing Instruction

7.4.1 Checking the operating pressure
(sealed systems)
On sealed heating systems the pressure gauge marker
must be within the green field.
Ensure that the red pressure gauge needle is set to the
required operating pressure.
Create an operating pressure
(overpressure) of at least 1 bar.
B Check the operating pressure of the heating system.
The operating pressure is too low if the pressure gauge
needle indicates below the green field. The system
needs to be topped up with water.
B Top up with water until the required operating pressure
is reached.
B Vent the heating system during filling.
1
Fig. 65 Pressure gauge for sealed unvented systems
1 Red needle
2 Pressure gauge needle
3 Green band
7.4.2

Checking the fill level (open systems)

In open systems, the hydrometer needle must lie within
the red field.
B Check that the hydrometer needle is within the red
field.
B Top up with water if the hydrometer needle is below
the red field.
UNI 7000 F
Heating system inspection and maintenance | 45
Fig. 66 Hydrometer for open systems
1 Hydrometer needle
2 Green needle
3 Red band
2
3
6 720 615 362-42.2O
1
2
3
6 720 648 663-05.1T
6 720 803 940 (2010/03)