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Frese OPTIMA Compact Frese ALPHA Frese Application Guide

Circulation of Minimum Flow - System End

with PICVs and flow limiters


The dynamic flow limiter (Automatic Balancing Valve) ensures a minimum flow for the cooling or heating devises to prevent from freezing or overheating.

The total flow rate for the flow limiters is based on the minimum required flow rate for the heating/cooling device.

The control of the minimum bypass flow can be made with either a PICV system where a dynamic flow limiter is placed at the end of the branch, or in a system where the PICV at the end of the branch is replaced with a 3-way valve with dynamic flow limiter on the outlet port.