9
Heating system servicing
Logano G225/Logano plus GB225 - We reserve the right to make any changes due to technical modifications.
54
9.4
Checking the heating system operating pressure
On sealed systems the pressure gauge needle must be
within the green range.
The red needle [1] on the pressure gauge must be set to
the required operating pressure.
V
Check the operating pressure of the heating system.
V
If the pressure gauge needle [2] drops below the green
band [3], the operating pressure is too low. Top up the
system with water.
Fig. 76 Pressure gauge for sealed unvented systems
1
Red needle
2
Pressure gauge needle
3
Green band
V
Top up with water via the boiler fill & drain valve.
V
Bleed the heating system.
V
Check the operating pressure again.
Set the operating pressure to at least 1 bar.
Caution: Risk of system damage due to
frequent topping up.
If you have to top up the heating water
frequently, the heating system may suffer
damage from corrosion or scaling,
depending on the water quality.
V
Ensure that the heating system is vented
correctly.
V
Check the heating system for leaks and
correct operation of the expansion vessel.
6 720 615 876-59.1RS
3
2
1
Caution: Risk of damage to system due to
material stresses caused by temperature
differentials.
V
Only fill the heating system when cold (the
flow temperature should be no more than
40 °C).
