Ver
sion:
M
P4/
6 G
3
08/
01
/2024
21
The pre-charge pressure in the expansion tank should be approx. 0.1 bar higher than the system’s static
pressure, and the minimum operating pressure should be 0.2 bar higher than the static pressure so that
there is always a little water left in the expansion tank.
Adjust the operating pressure in the system
When the boiler is being filled with cold water, the operating pressure must be set to
the lowest desired pressure; an appropriate lowest pressure is approx. 0.2 bar above the static pressure.
The operating pressure will vary in line with the temperature in the system, and this variation will
increase the greater the volume of liquid contained in the system.
The expansion tank has a capacity of 2 litres and the preset pre-charge
pressure is 1.5 bar. It can handle a system volume of 70 litres at 60°C and 5
metres of static pressure.
Adjust the bypass valve
To safeguard the flow, you may need to adjust the bypass valve between 1 and 4 turns.
The preset position on delivery is 2¼ turns.
If the flow through the bypass valve is too low, the pump may sustain
damage and there is an increased risk of the overheating protection being
triggered.
If the flow through the bypass valve is too high, the circulation
in the heating system may be too low.
Anti-freeze
If you are installing the boiler in an environment with temperatures below 10°C,
you can add max. 30% corrosion-inhibiting glycol.
The glycol must be corrosion-inhibiting to protect the system.
1. Adjustment of flow.
2. Opening and closing of the valves.
3. Position markings.
4. The location of the position markings
when the bypass valve
is open.