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A TERMOVAR THERMOSTATIC VALVE
is an automatic thermally operated tempering valve for solid-fuel boiler
installations with or without a heat storage tank. The TERMOVAR ensures a
minimum return water temperature to the heating boiler, which increases
combustion efficiency, prevents condensation, and considerably prolongs the
life of the boiler. The TERMOVAR eliminates the risk of destructive thermal
shock to both steel and cast iron boilers.
INSTALLATION
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The TERMOVAR valve is to be mounted between the boiler
and the heat load in the return pipe, as shown in the diagram below.
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A ball valve, for balancing flow, should be installed
in the recirculation pipe between the boiler supply pipe and the TERMOVAR
valve.
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A circulator must be installed between the TERMOVAR
valve and the boiler. This circulator is controlled by an aquastat
that measures boiler water temperature or, when there is a heat storage
tank being used, may be controlled by a sensor that measures smokebox temperature.
FUNCTION
The thermostatic element in the TERMOVAR prevents the return of cold return
water to the boiler until the boiler reaches operating temperature. The
TERMOVAR then gradually opens, blending hot boiler supply water with the
cold return water. Once system temperature equalizes, the TERMOVAR opens
fully to allow full flow to and from the heating load (the house and/or
a heat storage system).
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