INSTALLATION (continued) PAGE 32
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TERMOVAR TEMPERING VALVE
TERMOVAR TEMPERING VALVE is an automatic thermally operated tempering valve for
solid-fuel boiler installations with or without a heat storage
tank.
TERMOVAR ensures a minimum return water temperature to the heating boiler, which
increases combustion efficiency, prevents tarring and
considerably prolongs the lifetime of the solid-fuel boiler.
TERMOVAR eliminates the risk of destructive thermal shock
to both steel and cast iron boilers. TERMOVAR thermally
operated tempering valves render a more effective burning
and are therefore a necessary part of a solid-fuel boiler
installation.
INSTALLATION
1. The TERMOVAR valve is to be mounted between the boiler and the heat load in the return pipe, as shown
in the diagram below. Be careful to install the TERMOVAR with its
3 ports oriented correctly, as per the diagram packed with the TERMOVAR and as shown below.
2. When soldering near the valve be careful not to overheat the TERMOVAR thermostatic element.
3. A ball valve, for balancing flow, should be installed in the re-circulation pipe between the boiler supply pipe
and the TERMOVAR valve.
4. A circulator (designated C-3) must be installed between the TERMOVAR valve and the boiler. This
circulator is controlled by an aquastat (L6081A “LO” setting) that measures boiler water temperature.
FUNCTION
The thermostatic element in the TERMOVAR prevents 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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