Filling The Heating System And Checking For Leaks - Bosch UNI 7000 F Installation And Servicing Instruction

4.12 Filling the heating system and checking for leaks

Before putting the heating system into operation, it must
be checked to ensure that no leaks will occur during
operation. Pressurise the heating system with a
pressure equal to the response pressure of the safety
valve.
NOTICE:
System damage!
Temperature stresses can cause cracks if you
fill your heating system when hot. The boiler
will then leak.
B Only fill the system when cold (the flow
temperature should be no more than 40 °C).
B When the heating system is in operation, do
not fill it via the boiler fill & drain valve.
Instead, use an approved WRAS filling
method.
B Pay attention to the water quality as
specified in the operator's log, and record
the volume and quality of fill water used.
1
Fig. 33 Pressure gauge for sealed unvented systems
1 Red needle
2 Pressure gauge needle
3 Green band
B Fill the boiler and heating system via an WRAS
approved method.
B Slowly fill the heating system. Observe the display
(pressure gauge/hydrometer) while filling.
B Fill the heating system to the desired pressure
(e.g. 1.5 bar)
B Vent the heating system via the radiator bleed valves.
B Top up with water again if the operating pressure
drops as a result of bleeding the system.
UNI 7000 F
Fig. 34 Hydrometer for open systems
1 Hydrometer needle
2 Green needle
3 Red band
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6 720 615 362-42.2O
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Installation | 25
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6 720 648 663-05.1T
6 720 803 940 (2010/03)