8
Inspection/maintenance
Logano plus SB615 Gas - We reserve the right to make any changes due to technical modifications.
43
8.5
Checking the heating system water
pressure
A distinction is generally made between open vented and
sealed unvented heating systems. In practice, open
heating systems are seldom installed. We will therefore
be using sealed systems to demonstrate how you can
check the water pressure.
Open heating systems
For open heating systems, the hydrometer needle [1]
should be within the red band [3].
Fig. 33 Hydrometer for open unvented heating systems
1
Hydrometer needle
2
Green needle
3
Red field
Sealed heating systems
In sealed systems, the pressure gauge needle [2] must lie
within the green field [3]. The red pressure gauge needle
[1] must be set to the required heating system pressure.
B
Set the manometer pointer accordingly.
B
Check the heating system water pressure.
Fig. 34 Pressure gauge for sealed unvented heating
systems
1
Red needle
2
Pressure gauge needle
3
Green band
6720615883-33.1RS
1
2
3
Generate the operating pressure required for
the heating system.
CAUTION:
System damage due to frequent
topping up!
The heating system may be damaged,
depending on water quality, by corrosion or
scaling if you frequently need to top-up your
system with water.
B
Ensure that the heating system is vented
correctly.
B
Check the heating system for leaks and
proper operation of the expansion vessel.
B
Observe the requirements in respect of
water quality.
6 720 615 876-59.1RS
3
2
1
