The main regulation purpose of a surface heating is to equalize the resistance of flow in individual coils in order to achieve an even distribution of the flowing water.
Such a regulation can be effected by:
regulation valves on the lower strip of a distributor series 51A, 71A,
regulation—measuring valves (flow meters) on the lower strip of a distributor - series 55A and 75A.
Surface heating is a system operating on low parameters. The max supply temperature shall not exceed 55°C. Therefore in case of supplying a surface heating from the same source as traditional radiators local or central mixing sets shall be used.
Central mixing groups are used when a surface heating is planned at several storeys of a building. Mostly such groups are situated in a boiler room, close to a boiler.
Local mixing sets: are used in case a surface heating is planned within one storey. These sets shall be installed in installation boxes, close to a heating installation.
A distributor of 73A and 77A series connected directly to a heating installation serves as a local mixer. A thermostatic head with a capillary tube serves as a protection against a possible temperature rise. It can be adjusted down to from 55°C.