7
Inspection and maintenance
Logano plus SB745 - Subject to technical modifications
11
7.3.2
Sealed unvented systems
For sealed unvented systems, the pressure gauge needle
[3] must be within the green band [2]. The red needle [1]
of the pressure gauge must be set to the pressure
required for the heating system.
B
Check the heating system water pressure.
B
If the pressure gauge needle [3] no longer lies between
the two red indicators, top up with water.
B
Top up with water via the filling valve in the heating
system pipework.
B
Vent the heating system.
B
Check the water pressure once more.
Fig. 2
Pressure gauge for sealed unvented heating
systems
1
Red needle
2
Green marking
3
Pressure gauge needle
7.3.3
Installations with automatic pressurisation
units
For installations with an automatic pressurisation unit
observe the manufacturer's instructions.
The water quality requirements also apply here
(
Æ
chapter 7.3.1, page 10).
NOTICE:
System damage through frequent
topping up.
Subject to the water quality, your heating
system can be damaged through corrosion
or scaling.
B
Ensure that the heating system is vented
correctly.
B
Check the heating system for leaks and
the expansion vessel for functionality.
B
Observe the requirements regarding
water quality (see operator's log).
B
If water loss occurs frequently, locate the
cause and rectify the problem without
delay.
NOTICE:
System damage through
temperature stresses.
B
Only fill the heating system when cold (the
flow temperature must not exceed 40 °C).
B
During operation, only fill the heating
system via the fill valve in the heating
system pipework (return).
6 720 648 053-30.1T
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