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Expansion vessel
An expansion vessel suitable for the specific heating system shall be provided. The calculation for the additional expansion
vessel shall be carried out by an authorized professional.
Notes
(a) The expansion vessel is 2 liters and 1.5 bar pre-pressurized for 6kW units; 3 liters and 1.5 bar pre-
pressurized for 8/10/12/14/16kW units;
(b) Total water volume of 44 liters is default for 6kW units and 66 liters for 8/10/12/14/16kW unit; if total water is
changed because of installation condition, the pre-pressure should be adjusted to secure proper operation.
If the unit is located at the highest position, adjustment is not required;
(c) Minimum total water volume is 20 liters;
(d) To adjust pre-pressure, use nitrogen gas by authorized installer.
Ambient temperature and leaving water temperature upper limit
Note: the ambient temperature and water temperature should be subject to the actual operation of the unit.
leaving water temperature (°C)
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