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8 | Inspection and maintenance
Uni 3000 F6 720 812 901 (2014/10)
7.2.1 Checking and correcting the water pressure
Your heating system must contain sufficient water to ensure it functions
correctly.
Top up your heating system with water if the system pressure is
too low.
Check the water pressure monthly.
7.2.2 Sealed unvented systems
If the pressure in the heating system drops below the required minimum
operating pressure ( Table 3, page 10): Add top-up water.
Check the water pressure of the heating system.
Check operating pressure. If the pressure in the system drops below
the values in Table 3, water must be topped up.
Top up with water.
Vent the heating system.
Check the operating pressure again.
7.2.3 Open vented systems
For open vented systems, the hydrometer needle [1] should be within
the red band [3].
The operating pressure depends on the static height of the system and
the installation height of the expansion vessel.
Fig. 4 Hydrometer for open vented heating systems
[1] Hydrometer needle
[2] Green needle
[3] Red marking
7.3 Installations with automatic pressurisation units
For installations in which an automatic pressure maintaining system is
integrated, observe the manufacturer's instructions. The water quality
requirements also apply here (see Operating Instructions).
NOTICE: Risk of 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.
Notify your heating contractor if you find the need to
refill your heating system frequently.
Check with your local installer as to whether the
incoming water source can be used without further
treatment, or whether it must first be treated.
NOTICE: Risk of equipment damage from thermal
stress!
Only fill the heating system when cold (the flow
temperature must not exceed 40 °C).
Fill the heating system during operation only by a
WRAS approved filling method in the return pipe work
for the heating system.
6 720 615 361-04.1SL
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