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Inspection and maintenance
9
Uni Condens 8000 F – 6720867069 (2016/10)
6.3.1 When should you check the operating pressure in the
heating system?
The fill and top-up water quality must comply with the specifications in
the operator's log supplied.
Air pockets may form in the heating system through the fill or top-up
water releasing gases.
Vent the heating system (e.g. at the radiators).
If required, top up with water.
Recently added fill or top-up water loses much of its volume in the first
few days because it releases gases.
With newly filled systems:
Initially check the operating pressure of the heating water daily and
then in ever increasing intervals.
Once the heating system is hardly losing any volume:
Check the operating pressure of the heating water once a month
A distinction is made between open and closed systems. In practice,
open vented systems are rarely installed nowadays. We will therefore be
using a closed heating system to demonstrate how you can check the
operating pressure. All settings will have already been made by the
contractor when the system was first commissioned.
6.3.2 Sealed unvented systems
NOTICE:
System damage due to frequent topping up!
Subject to the water quality, your heating system can be damaged
through corrosion or scaling.
Ensure that the heating system is vented correctly.
Check the heating system for leaks and the expansion vessel for
functionality.
Observe the requirements regarding water quality
( operator's log).
If water loss occurs frequently, locate the cause and rectify the
problem without delay.
NOTICE:
System damage due to temperature stresses!
Only fill the heating system when cold (the flow temperature must not
exceed 40 °C).
During operation, only fill the heating system via the filling facility in
the heating system pipework (return).
In closed systems, the pressure gauge needle ( fig. 2, [3], page 9)
must be within the green marking [2]. The red needle [1] of the pressure
gauge must be set to the minimum pressure required for the heating
system.
Check the operating pressure of the heating system.
If the pressure gauge needle [3] drops below the green marking [2]:
Top up with water.
Top up with water via a filling facility in the heating system pipework.
Remove air at the heating system.
Check the operating pressure again.
Fig. 2 Pressure gauge for sealed unvented heating systems
[1] Red needle
[2] Green marking
[3] Pressure gauge needle
6.3.3 Installations with automatic pressurisation units
For installations in which an automatic pressure maintaining system is
integrated:
Follow the manufacturers' instructions.
Observe water quality requirements ( operator's log).
6.3.4 Water samples
The quality of the fill, top-up and boiler water must be regularly
documented in an operator's log.
Have water samples taken by a contractor.
Document result in operator's log.
6 720 648 053-30.1T
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