gfps_GF_JRGUMAT.pdf 

Function

The JRGUMAT thermoblending valve is an open architecture, proportionally-regulating three-way mixer. 
The blended water temperature is transferred to the thermostat A. This compares it with the set-point 
value. If the blended water temperature does not  correspond to the set-point value, a volume change 
takes place in the thermostat A. This causes the valve slide B to be regulated through the pin C, until the 
blended water temperature corresponds to the set-point value. The valve can mix the water used only as 
it is drawn. Functions such as back flow prevention, blocking or adjustment of the circulation flow volume 
cannot be performed by the JRGUMAT thermoblending valve. 

The model to be used will depend on the installation diagrams.
A  Thermostat 
B  Valve slide, gunmetal, coated
C  Pin, chromium-nickel steel
1  Body, gunmetal
2  Regulating gate, gunmetal
3  Adjusting screw, brass
4  Cold water seat, stainless steel
5  Hot water seat, gunmetal
6  Circulation sleeve, plastic

The hot water temperature 
In order to be able to ensure the perfect operation of the JRGUMAT thermoblending valve, the hot water temperature must be at least 5 K over the desired blended water temperature. Likewise the same hydraulic conditions must apply to the inflowing hot and cold water. This is ensured by the installation of the mixer in the water heater circuit in accordance with our installation diagram.

Nomogramme

Nomogramme for JRGUMAT thermoblending valves 3400, 3410 and 3412
The pipe dimension determined when calculating the pipe dimension is also considered the nominal DN size for the JRGUMAT thermoblending valve. The relations between volume flow, nominal size and pressure loss can be read from the nomogramme. Optimal operating conditions prevail within the hatched range.

Noise characteristics

Factory settings/Resetting

JRGUMAT thermoblending valves are equipped with one of the standard preset temperature thermostats 
and are adjusted to a standard temperature in the factory. This is apparent from the article number,  it appears in the centre of the temperature label F  and is indicated on the packaging. The standard temperature may be changed only within the limits of the corresponding blended water adjustment range.  
This is done as follows: The Allen key G is used to pierce the middle of the temperature label F.  
By turning the screw H clockwise the blended water temperature is increased and by turning it anticlock-wise it is decreased. The volume flow must at all  times lie in the hatched field “Set-point value tolerance ± 1K”, (see nomogramme). 
If the mixer is built into a circuit network, the circulation is to be adjusted separately with “zero-drawing”. 
For this purpose, the total volume flow of the pump (100%) is first set. Then set the volume flows leading 
to the mixer and the portion for heat-loss coverage on the storage unit. Well-regulated circulation holds the desired blended water temperature constant, even if no blended water is drawn.

Field of application
JRGUMAT thermoblending valves, which have proven their worth a thousandfold, are thermostatically 
regulating blending valves which are used  wherever a constant and highly accurate combined blended water 
temperature is desired and required. 

For example as central mixer in private houses, blocksof flats, hospitals, old-age and nursing homes, hotels, 
barracks, shower-rooms of sports facilities, industrial and commercial buildings.  JRGUMAT thermoblending valves also serve as overheating protection in alternative energy plants such assolar units, wood-fired heaters, wood-chip heaters, pellet furnaces, etc. Owing to the high control accuracyof JRGUMAT thermoblending valves, they are also used for special applications, such as temperature maintainers used as regulators.  
 
DVGW permission
There is also absolutely no reason why JRGUMAT thermoblending valves should not also be installed without the DIN DVGW test mark.