Mixing unit for underfloor heating vieir

Vieir VR202 mixing unit

Mixing unit is designed to create a secondary circulation loop in the heating system with automatic regulation of the coolant temperature according to a predetermined value.

The VR202 mixing unit is convenient for installation in the boiler room with the floor heating collector remote from it, but can also be installed in parallel with the radiators in one-pipe or two-pipe heating systems. It consists of two hydraulic blocks between which the pump (not included) is installed. The lower hydraulic block is equipped with a balancing by-pass and a thermostatic valve fitted with a thermostatic element (valve head) which automatically regulates the flow of the heating medium from the high temperature circuit so that the temperature of the low temperature circuit corresponds to the set value. Upper hydraulic unit equipped with automatic air vent, thermometer and thermowell in which the thermostatic head sensor is installed. The mixing unit is designed for use with circulation pumps with an assembly length of 130 mm or 180 mm and has coupling nuts for connecting pumps marked 25\. For ease of installation provides detachable connections for all elements of the unit, including the connection of the manifold group.

Connections for high-temperature circuits: 1″ N. connections Manifold connections: 1″ female connection. thread Maximum heating capacity: 12.5 kW Low-temperature control range of the fluid temperature: 20C. 65°C Max. inlet temperature: 90°C Max. working pressure: 10bar Min. head before thermostatic valve :1m! Measuring range of thermometer: 0C. 80С

Overall dimensions Mounting example
mixing, unit, underfloor, heating, vieir

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Experimental elucidation of the value set by the bypass.

Before installing the bypass it would be helpful to check what the full opening and closing of the bypass corresponds to.

Just be careful the edges of the slot are sharp as blades.

If the mixing unit is already installed and the 0-5 scale sticker has been affixed, it is possible to conduct an experiment.

Turning the adjusting screw with a wrench on 10 to find out in what position the scale maximum and minimum water flow rate on the flow meters of the manifold floor heating.

If there is no manifold or flow meters, which is very unfortunate, you can find the maximum and minimum temperatures at a limited temperature of the coolant in the base system (at the inlet to the mixing unit) and the maximum possible installation of a thermostatic head of the mixer.

The temperature of the coolant on the boiler is limited so that the mixer can not cope with the set temperature.

Why do you need a pump mixing unit for underfloor heating. principle of operation, selection, installation rules

Underfloor heating is one of the most comfortable heating systems. Underfloor heating works perfectly both independently and as an additional circuit, providing the most comfortable temperature regime. When using underfloor heating and central heating, it is necessary to install a mixing unit. Exactly the pump and mixing unit for underfloor heating and will be considered in this article.

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What adjusts the bypass of the mixing unit TIM JH-1036.

Mixing node has a conditional mixing chamber, through which the heating circuit and the boiler heating circuit of the underfloor heating.

Normally, a floor heating mixer has one setting. water temperature in the underfloor heating loop. The mixing unit TIM JH-1036 has another bypass, and it is also adjustable. And this is not the bypass balancing bypass, which is triggered by the excessive head developed by the pump.

Filling and aeration of underfloor heating mixing unit Shunt FS36 mini

balancing bypass on the pressure can be seen in the photo. The rightmost cause.

I need it because it is possible to overlap all directions of underfloor heating as a result of automatic regulation. By the way, how to adjust the balancing bypass TIM M307-4 I have not figured out. Can anyone tell me.

As for the bypass of the mixing chamber, you can find such a graphic explanation of the work of the bypass of the mixing unit:

mixing, unit, underfloor, heating, vieir

It is even more unclear what the numbers on the scale mean and to what the current value is linked. All this can only be found out by holding the mixing unit TIM JH-1036 in your hands:

It turns out that the adjusting screw turns the cylinder, which has a slot that overlaps when turning. Water can be pumped through this slot by the circulation pump, bypassing the conditional mixing chamber.

Please note that the sticker with a scale of 0 to 5 can be glued on at will.

The maximum opening of the slit (pictured above) corresponds to the setting of the adjusting screw to position 5 (pictured below).

As a reference point for reading the scale value it is possible to take a technological ledge on the body of the mixing chamber. With a scale value of 0, the slot is closed as much as possible. In this position, all water pumped through the floor heating circuits flows through the mixing chamber.

When the bypass is completely closed, the heat output of the mixing unit from the heating system is maximal.

If the bypass is fully open, then part of the water circulates through the heating circuits without entering the mixing chamber. and the heat output of the extraction is minimal.

But in practice it turned out that not only the heat output is regulated by the bypass.

What is the best way to choose the mixer

Choose a thermal mixer must take into account the characteristics of the heating device. When selecting the distribution equipment it is necessary to take into account the way of mixing. central or lateral.

If the area is large, with several separate circuits, the arrangement of a mixing unit with three-way valve is mandatory. This unit will perfectly cope with a large volume of liquid. In the case of a single circuit floor, a manifold with a two-way mixer is suitable.

Pump and mixing unit for underfloor heating can be made by your own hands, but if you buy a ready-made, we advise these models:

  • VT.COMBI and VT.COMBI.S. for preparation of low-temperature coolant, a two-way valve is used, it is controlled by a thermostatic head or servodrive. Temperature sensor is not included. must be purchased separately.
  • VT.COMBI. the node is equipped with a balancing valve, with which you can regulate the pressure in the system.
  • VT.COMBI.S. with this model of NSU manifold can be connected both on the inlet and outlet. Therefore, it is used for two types of heating (radiator and TP).
  • VT.DUAL. the mechanism includes two modules (pump and thermostatic), between them is placed a manifold group. Mixing is performed by a three-way valve with thermostatic head.
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These are tried and tested models, and it is better to buy them.

Assembly and connection of the water floor manifold

manifold for underfloor heating. a distribution node that redirects the coolant from the heating boiler to several circuits of the floor heating system. But depending on the configuration of the design, it can also have other functional tasks. For example, deaeration of the system, adjustment of coolant volumes and control of its flow by means of manual or automated flowmeters. It actually provides maintenance of the desired temperature in the heating circuits of the underfloor heating (TP).

Among installers of heating systems, because of the characteristic appearance of the manifold, is widely distributed its another slang designation. “comb.

Mixing units

Complete VALTEC modules allow you to quickly solve the problem of creating underfloor and wall heating, heating of the outdoor areas, other built-in climate systems. Pump and mixer units VALTEC COMBIMIX (VT.COMBI), DUALMIX (VT.DUAL) provide a coolant reduced (relative to the parameters of the heat source) temperature, circulation of working fluid in the floor heating loops, separation of the primary and secondary circuits, the linkage of radiant, underfloor heating. VALTEC mixing units are designed for use with manifold blocks with a 200 mm centre-to-centre distance (design VT.COMBI allows installation at a distance from the manifolds), are placed in a switchboard. For projects which involve installation of underfloor heating on a small (up to 15 sq.m.) surface. m) square, wall, radiator heating systems, thermostatic installation kits VT.ICBOX, which allow you to link the high and low temperature circuits without pump-mixing unit, to control heaters, without installing individual thermoregulators.

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Making a Homemade Manifold

To make a manifold of polypropylene pipes, we recommend using a design diameter of 32 mm or 25 mm, their respective tees and stop valves.

How many loops of the floor heating will be connected, as many tees and valves will be needed for the collector. You will also need to buy a circulation pump and valve for the mixing unit.

For soldering pipes needs a special soldering iron, as well as at least minimal experience with such equipment. From tees and pipes form the supply and return sections of the collector. The pipe sections must be very short, so that the T-pieces are separated by only a small space.

After that solder shutoff valves, as well as fittings to connect the pump, etc.п. Such a simple device is inexpensive if you don’t install flow meters and other controls.

But it is easier to buy a more advanced plastic manifold than to make one.

VRT MIX pump and mixing station.01.130

Pump and mixer unit is designed to create low temperature systems in the heating system. Node allows you to regulate the temperature and flow of the coolant, provides maintenance of the set temperature and flow rate in the secondary circulation loop. Mixing unit is used in underfloor and wall heating systems.delivered without circulation pump. The mixer consists of two modules (pump and thermostatic) mounted on both sides of the flow and return headers.

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Characteristics Performance value at the pump: 25-60 130
Heating capacity of mixing unit 30 kW
Mounting length of the pump 130 mm
Maximum temperature of the heat carrier in the primary circuit 99 ˚С
Max. operating pressure 10 bar
Setting limits for temperature of the thermostatic valve with thermostatic head 20-50 ˚С
Maximum flow capacity (Kvs) of the thermostatic valve (pos.10) 4,5 m3/h
Setting limits of safety thermostat 20-90 ˚С
Safety thermostat protection class 4.5 M3/HOUR IP40
Thermometer measuring limits (pos.5) 0-80
Maximum temperature of the air surrounding the unit 50 ˚С
Minimum pressure before the pump 0.1 bar

Components

Name Function
1. Five-way manifold. Includes connections for manifolds, pump, pressure gauges, thermostats, sensors.
2. union nut. Connection of manifold groups with internal thread
3. Nipple 1’’. G1’’.
4. Bypass bypass. Bypasses the coolant from the flow manifold to the return manifold when the manifold circuits are closed. Provides coolant circulation in the primary circuit when the pump is switched off.
5. Liquid thermostatic head. Regulates the heating medium flow depending on the outlet temperature from the mixing unit. Manually set the required temperature.
6. Thermostatic valve. Regulates the primary heating medium flow (sub-balance) through the thermal head (5).
7. Sleeve nuts 1 1/2’’. For mounting the circulation pump.
8. Control valve with nozzle. Adjusts the flow rate of the coolant returned to the primary circuit. Adjustment with an Allen key.
9. Thermostat Safety pad thermostat. Turns the pump off if the setpoint value for the heating medium temperature is exceeded.
10. Thermometer (axial-axial connection) Display of current value of temperature of heating medium at the inlet to the flow collector.
11. Circulation pump. Allows circulation of the heat transfer medium in the secondary circuit (not included in the delivery, to be purchased separately).
12. Balancing valve. Differential pressure adjustment between supply and return manifolds when closing the underfloor heating circuits. Adjustment with an Allen key. Then secure the pin in the valve with a screwdriver. If the pin is loose, the valve can be closed, but when opened, it returns to the presetting.

How a pump and mixer unit works

A circulation pump 11 circulates the heating medium through the floor heating circuits. When the fluid cools down below the setting temperature of the thermostatic head (5), the thermostatic valve (6) opens and the secondary circuit is fed with the fluid from the primary circuit with a medium flow from the secondary circuit flow collector. If the secondary circuit temperature exceeds the setpoint, the safety thermostat (9) is triggered, thus stopping the circulation pump.

In this case, the circulation of coolant in the secondary circuit is stopped, and in the primary circuit it occurs through the bypass (4). This ensures a constant flow rate in the primary circuit. Bypass also serves to bypass the coolant in case all heating circuits are closed.

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