How to eliminate: "Unbalanced circuit of terminal unit "XY"..."

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Product InstalSystem 5
Type of article TYPICAL PROBLEM
Source for translation IS 5.0 Beta 2.0.B5


Problem description

The message is displayed when the determined flow rate across the terminal unit is higher than the required flow. Hydraulically unbalanced circuits are diagnosed by displaying the message:

  • Unbalanced circuit of "XY" terminal unit (XY% of required flow) - check capabilities of control components in circuit

Unbalanced circuits may result from:

  • lack of valves that limit maximum flow or control the flow across the units (e.g. thermostatic valves),
  • insufficient control/balancing capabilities of the fixtures used (e.g. excessive kv at minimum setting of the valve),
  • incorrect distribution in Tichelmann system (lengths of circuits, between the source and every subsequent terminal unit, should be similar),
  • incorrect specification of pipe types and/or pipe diameters for connections of Heating/Cooling Zone or pipe-runs feeding the terminal units (diameters of the feed pipes and of the circuit proper should match).
    Inconsistency in diamters may result in incorrect/excessive use of connecting fittings which increases flow resistance and differences in pressure drops,
  • differences in sizes of terminal units or groups of terminal units in a Tichelmann system.

Solution

  • Proper specification of pipe types and/or diameters for connections to Heating/Cooling Zone or pipe-runs feeding the terminal units.

  • Use flow control components.
  • Eliminate differences in sizes of terminal units by connecting them in series.