Valtec mixing unit for underfloor heating

How to connect a Valtec mixing unit to the floor heating system

Before you begin assembling and selecting a Valtec mixing node for underfloor heating, it is necessary to analyze the advantages of this type of water circuit.

  • Thanks to quality materials, strong fasteners, ensures reliable operation.
  • Components developed in the form of modules are precisely mated, eliminating the risk of leaks.
  • The manufacturer has provided release of auxiliary materials required for thermal and waterproofing equipment.

Pump and mixing sets for water underfloor heating

The required flow rate of the heating medium in any hot water heating system is calculated using the following formula:

where Q. thermal capacity of the system, W; s. specific heat capacity of the coolant, J/kg ° C; ∆T. temperature difference between the direct and return coolant, ° C.

In radiator heating systems the temperature difference ∆T is usually around 20 ° C, and in floor heating systems ∆T = 5-10 ° C.

This means that to transfer the same amount of heat, underfloor heating requires 2-4 times the flow of the heating medium.

The maximum temperature of the heat carrier in underfloor heating systems generally does not exceed 55 ° C, the operating value of this parameter is usually between 35-45 ° C.

In radiator heating, the coolant is usually supplied with a temperature of 80-90 ° C.

In connection with these two factors, a mixing unit is an invariable attribute of an underfloor heating system.

The pump and mixing unit of the floor heating system shall perform the following basic functions:

  • maintain the secondary circuit coolant temperature below the temperature of the primary circuit;
  • provide the estimated flow rate of the coolant through the secondary circuit;
  • provide hydraulic linkage between the primary and secondary circuits.

The auxiliary functions of the pump-mixing unit include the following:

  • temperature indication (inlet and outlet);
  • Shutting off the circulation pump with ball valves for replacement or maintenance;
  • protection of the pump from operation on a “closed gate” by means of a bypass valve;
  • emergency pump shutdown when the maximum coolant temperature is exceeded;
  • venting the coolant;
  • draining unit.

The principle of operation of a simple pump-mixing unit can be explained by the heat-mechanical diagram in Fig. 1.

The heated coolant comes to the pump mixing unit inlet from the boiler or riser of the radiator heating system with the temperature of T1. At the inlet to the node is set thermostatic valve 2, which sets the required temperature of the coolant flowing into the warm floor T11. The temperature sensing element 3 of the valve actuator is located after pump 1. When the temperature T11 exceeds the setting value, the valve 2 closes, and when the temperature decreases. it opens, allowing the hot coolant to pass to the pump inlet. After flowing through the floor heating loops, the coolant cools down to the temperature of T21. Part of the cooled coolant returns to the boiler and the other part via balancing valve 4 comes to the pump inlet, mixing with the hot coolant.

Thus, in the primary (boiler) circuit, the coolant temperature decreases from T1 to T21 (∆Tkk = T1. T21). Temperature T21 is set by the user. The temperature difference in the floor heating loops ∆Ttp = T11. T21 is also set at the calculation stage. Knowing this data, and the required thermal capacity of the underfloor heating, we can determine the ratio of flow rates in the node:

  • temperature at the inlet to the pump-mixing unit T1 = 90 °С;
  • temperature after the pump T11 = 35 °C;
  • temperature difference in the floor heating loops ∆Ttp = 5 °C;
  • floor heating power Q = 12 kW.
  • temperature at the outlet of the floor heating loops: T21 = T11. Ttp = 35. 5 = 30°C.
  • temperature drop in the primary (boiler) circuit: ∆Tkk = T1. T21 = 90. 30 = 60 °С.
  • flow rate in the secondary circuit G11 = Q/c⋅ ∆Ttp = 12000/4187⋅5 = 0.573 kg/s.
  • flow rate in primary (boiler) circuit G1 = Q/c⋅ ∆Tmp = 12000/4187⋅60 = 0.048 kg/s.
  • Flow rate through the bypass G3 = G11. G1 = 0.573. 0.048 = 0.535 kg/s.

Thus, the flow rate in the floor heating circuit in this example must be 12 times higher than in the boiler circuit.

A circulation pump is generally oversized when project planning, so it can transfer more heat transfer fluid via the bypass than the design requires. In addition, the temperature of coolant in the primary circuit may in fact be less than the design temperature. The balancing valve 4, which can be used to limit the flow through the bypass, is used to correct these deviations from the design data.


In pump-mixing units VT.COMBI and VT.COMBI.S (Fig. 2, 3) The low temperature coolant is prepared by a thermostatic valve controlled either by a thermostatic head with a capillary temperature sensor installed in the supply line of the manifold (VT model).COMBI), or by an analogue actuator, which operates under the control of the VT.К200.M (model VT.COMBI.S). The controller with heating medium and outdoor temperature sensors is not included in the delivery of the pump-mixing unit and must be purchased separately.

A balancing valve is installed in the primary coolant flow line, which balances the coolant quantity coming from the secondary return line against the primary flow line and equalizes the pressure of the water coming from the floor heating system against the pressure after the thermostatic valve.

The heat output of the mixing unit depends on the Kvb setting of this valve and the speed set for the pump.

The unit is adapted for connection of manifold blocks with interaxial distance of 200 mm and horizontal offset between the axes of manifolds of 32 mm. The manifold blocks can be connected either at the inlet or outlet of the pump-mixing unit. This allows the assembly to be used in combined heating systems. where underfloor heating is combined with radiant heating.


VT.DUAL (fig. 5 and 6) consists of two modules (pump module and thermostatic module), between which a floor heating loop manifold unit is mounted. A three-way thermostatic valve controlled by a thermostatic head with a capillary thermosensitive element mounted on the return manifold of the secondary circuit is used for mixing.

A flow thermostat in the flow manifold stops the pump in case the set-point temperature is exceeded, interrupting the circulation in the floor heating loop.

The design of the unit includes a bypass circuit with a balancing valve, which keeps the flow rate of the primary circuit unchanged when the floor heating loops are closed.

The mixer elements are not positioned vertically but with a 9° angle due to the horizontal offset of the manifold block axes. This allows you to connect the unit to the supply piping on either the right or left.


VT mix manifold pumping unit.VALMIX differs from VT.COMBI unit is shorter in length and lacks a bypass valve. Designed for mounting a 130 mm circulation pump. The manual air vent of the unit is located on the adjustment sleeve of the secondary balancing valve.

The unit comes with the VT thermal head.3011, which has a temperature adjustment range of 20 to 62°C. VT can be fitted with an analogue thermoelectric VT actuator instead of a thermostatic head.TE3061, which operates under controller control VT.K200.М. Unit supplied without circulation pump.

VT mixing pump unit.TECHNOMIX

Same as VT.VALMIX, the VT.TECHNOMIX is designed for a circulation pump with a length of 130 mm, but has a slightly longer installation length.

The inlet and outlet connections are on the same plane and therefore fitted at an angle of 9° to the manifold block and can be installed on the right or left of the manifold block to be served.

Unit is supplied with a VT thermal head.5011 with a temperature adjustment range of 20 to 60 °C.

Instead of the thermostatic head, the VT.TE3061 under the control of the VT.K200.М. Unit supplied without a circulation pump.

Comparison of VALTEC mixing pump units

Table 1. VALTEC comparison table for pump and mixer units

Name of parameter Index value for the node
Connectable heat output at ∆T=10°C with pump VT.VRS.25/4G, kW 15 20 13 14
Heat output at ∆T = 10°C with VT pump.VRS.25/6G, kW 20 30 18 19
Operating pressure, MPa 1,0 1,0 1,0 1,0
Maximum temperature of coolant in the primary circuit, °C 90 120 110 110
Mounting length of the node, mm 156 87-92 140 170
Mounting length pump, mm 180 130 130 130
Centre distance of connecting spigots, mm 200 200 200 200
Connection threads, inches G1 V G1 G1 V G1 B; H
Thermostatic valve Kvs, m3 /h 2,75 2,75 3,42 2,63
Primary balancing valve Kvs, m3/h 2,8 2,6 2,27 2,27
Kvs of the secondary balancing valve, m3/h 5,0 3,42 11,3
Connection to the primary circuit Left Any Left Any
Availability of bypass valve Yes Bypass No No
Type of air vent Auto Manual Manual Manual
Safety thermostat available No Check out No No
Number of thermostatic valve strokes 2 3 3 2
Mounting position Vertical. Angle 9° Vertical. Angle 9°

Pump-less regulation units for underfloor heating

A special group of underfloor heating control components are the VT.ICBOX. VT modules.ICBOX.1 and VT.ICBOX.2 are used in cases where the use of pump-mixing units is not economically feasible, and for the arrangement of underfloor heating is sufficient only one loop, whose length does not exceed 100 m.

The modules have a built-in adjustable limiter for the temperature of the heating medium 1, thermostatic valve 2, and manual air vent 3.

Thermostatic installation kit VT.ICBOX.1 designed to work with a thermal head, having a remote temperature-sensitive element VT.5010, because its thermal head is located inside the mounting box. VT Module.ICBOX.2 works with the VT standard thermostatic head.5000.

The modules are installed at the outlet of the floor heating loop The temperature limiter regulates the amount of coolant entering the loop so that its temperature does not exceed the set value. The thermostatic valve closes the flow of the heating medium into the loop when the room temperature exceeds the value set on the thermostatic head. When installing these modules in a system with a supply temperature of the coolant above 60 ° C, part of the loop should lead to the section of the “warm wall. And only when the temperature of the heat carrier is reduced to 60 ° C, the loop can continue along the floor

If the floor permissible surface temperature is limited to 35 ° C, for the walls this value is 70 ° C, so the cool-down of the coolant in the walls is much faster than on the floor

Valtec Combi pump and mixer unit. The ideology of the basic adjustments

VALTEC COMBI pump and mixing unit significantly simplifies the work on the adjustment of heating systems, which is one of the most complex engineering tasks in heating. This node is a complete solution for the organization of the floor heating loop in heating systems

Table. 1. Valtec Combi pump/ mixing station specification

Valtec Combi pump and mixing station is designed to maintain a predetermined temperature of the heat transfer fluid in the secondary circuit by the mixing of the return line.

By using this node it is also possible to link hydraulically an existing high-temperature heating system with a low-temperature floor heating circuit. In addition to the basic controls, the assembly also includes all necessary service elements, such as air vents and drain valves (Fig. 2 and Tab. 1). The thermometers allow easy monitoring of the assembly without additional instruments and tools.

An unlimited number of underfloor heating branches can be connected to the Valtec Combi, provided that the total flow rate of the heating medium in these branches does not exceed 1.7 m3/h (28 l/min.). This water flow corresponds to a total power of 10 kW at a design temperature difference of 5 C and 20 kW at a design temperature difference of 10 C. When connecting several branches of the floor heating system to the unit we recommend the use of the Valtec VTc manifold blocks.594 or VTc.596. The node does not include a pump, as the pump is selected according to the characteristics of the specific system. The pump can be integrated into the unit if it has an installation length of 180 mm (without pipe fittings) and a screwed connection for coupling nut 1 1/2#698.

The main regulating elements of the pump and mixer unit

Secondary balancing valve (pos. 2 in the diagram in Fig. 2, fig. 3). This valve ensures the mixing of the heating medium from the return manifold of the floor heating with the heating medium from the supply pipe in the proportion required to maintain the set temperature of the heating medium at the outlet of the Combi unit. The valve setting can be changed with a hexagon spanner and is secured with a clamping screw to prevent accidental turning during operation. on the valve there is a scale with values from 0 to 5 m3 /h.

Note: The capacity factor kv is numerically equal to the flow rate [m3 /h] at a pressure drop of 1 bar at the valve.

Balancing and shut-off valve of primary circuit (pos. 8 in fig. 2, Fig. 4). This valve is used to set the required amount of heat carrier flowing from the primary circuit to the unit (unit balancing). In addition, the valve can be used as a shut-off valve to shut off the flow completely. The valve is equipped with a micrometer screw, through which the flow rate can be adjusted. Open and close the valve with an Allen key. The valve is equipped with a protective threaded plug. 3. Relief valve (pos. 7 in Fig. 2, fig. 5). During operation of the heating system, it may occur that all underfloor heating control valves are closed. In this case, the pump will run with the system shut off (no flow rate) and will fail quickly. In order to avoid such modes, on the node is a bypass valve, which at full closure of valves system underfloor heating opens the additional bypass and allows the pump to run water on a small circuit without working on the closed gate.

The valve is triggered by the differential pressure created by the pump. The differential pressure at which the valve opens is set by turning the regulator. The valve body has a scale with a setting range of differential pressure of 0.2 to 0.6 bar. The pumps recommended for use with a Valtec Combi are able to develop a maximum pressure of 0.22 to 0.6 bar.

Once the heating system is completely assembled, pressure-tested and filled with water, it must be set. Adjustment of the control unit is carried out together with the commissioning of the entire heating system. The best option is to adjust the unit before you start balancing the system.

Adjustment algorithm for the control unit

To set the mixing valve, proceed as follows.

Remove the thermal head (pos. 1 in the diagram Fig. 2) or servo actuator from the thermostatic valve of the module The actuator of the thermostatic valve is removed to keep it from interfering with the setting process of the module.

Set the diverter valve (pos. 3) and the balancing valve (pos. 4). 7 in the diagram in Fig. 2) to the maximum differential pressure (0.6 bar), fig. 7. This is to rule out a possible trip of the valve during adjustment of the assembly.

Set the secondary balancing valve (pos. 2 in the diagram Fig. 2). The required capacity of the balancing valve can be calculated using the formula:

where t1 is the primary flow temperature; t11 is the secondary flow temperature; t12 is the return temperature (both loops have the same temperature); kvt is the capacity factor of the valve, set at 0.9. Set the resulting kv value on the valve

Set the pump to the required speed. It is required to calculate water flow rate in the secondary circuit and pressure losses in the circuits after the node according to the formulas:

Водяной теплый пол VALTEC. Схема Работы с насосно-смесительным узлом

where Q is the sum of the heat output of all loops connected to the mixer; 4187 heat capacity of the water [J/ (kg⋅(kg C)], and if another heat carrier is used, the heat capacity is taken from the technical data sheet of this heat carrier; t11 and t12 the temperatures of the heat carrier at the secondary circuit supply and return pipes respectively.

The pressure loss in the design circuit of the floor heating (including manifolds) can be obtained by performing a hydraulic calculation of the floor heating. We recommend using the Valtec calculation program for this.PRG, available for download at

Using nomograms of pumps, determine the pump speed. To determine the pump speed, a point on the graph is marked with the corresponding head and flow rate. Then the nearest curve above the given point is detected, and it will correspond to the required speed. The speed is set with a switch on the pump.

Balance the floor heating loops. Before balancing, close the balancing and shutoff valve of the primary circuit (pos. 8 in the diagram Fig. 2). To do this remove the valve plug and use an Allen key to turn the valve counterclockwise as far as it will go

The task of balancing the floor heating loops is to ensure that each loop has the design flow rate of the heating medium, and thus that the floor surface is heated evenly.

The loops are adjusted using balancing valves or flow regulators on the manifolds. VTc manifold blocks are generally connected to a Combi knot.594 or VTc.596. VTc manifold blocks.594 are equipped with balancing valves on the supply manifold and on VTc units.Flow rate controllers with float-operated flowmeters are installed. For easy setting of the loops connected to the manifold VTc.594, we recommend that each floor heating loop be equipped with a VT in-line flowmeter.FLC15.

Perform the loop balancing in the following sequence: open the balancing valves or flow controllers on all floor heating loops to the maximum. Start with the loop where the deviation between the actual flow rate and the design flow rate is greatest. The valve on that loop is pressed down to the desired flow rate. Set the flow rate of each floor heating loop in the same way.

If a flowmeter is available, simply enter the desired flow rate on the flowmeter scale [l/min].] using a balancing valve or regulator If a flow rate indicator cannot be used, the loops can be set approximately according to the floor heating or return temperature.

If in the process of balancing failed to get the required flow rate in the loops even with open valves, it means that the hydraulic calculation was performed incorrectly and the pump should be switched to a higher speed.

If the Combi mixing set serves only one circuit, balancing is not required.

Set the balancing valve of the primary circuit (pos. 8 in the diagram in Fig. 2). The primary circuit valve setting is made in the course of the overall balancing of the heating system. The essence of balancing is to set the design flow rate in each circuit, branch, heater, as well as in the primary circuit of the Combi unit.

If the balancing of heating systems is done incorrectly, then the operation of individual sections of such a heating system will not be correct.

A detailed piezometric diagram for the designed heating system is drawn up for the hydraulic calculation. During the calculation, the required pressure losses at each balancing valve are determined. Then the flow capacity of the valve is determined:

where V is the volume flow rate of the coolant, m 3 /h; Δp pressure drop required on the valve, bar.

After calculating the flow capacity according to the recommendations of the balancing valve manufacturers, the adjuster sets each valve to the design flow capacity. The hydraulic calculations shall be performed by qualified specialists according to the normative procedures or with the help of special calculation programs, e.g., Valtec.PRG.

Setting the revolutions on the valve is done in the following order:

#10063 according to the table of adjustment of the valve, turn the screw on the required number of revolutions to fix the turnovers to use the marks on the valve and screwdriver (according to the example given it is necessary to make 2 1/4 revolutions, Fig. 11);

#Open the valve as far as it will go by the number of revolutions by which the screwdriver has been turned. After adjustment, the valve can be opened and closed with an Allen key, and the adjustment of the flow rate will remain unchanged.

Setting the bypass valve (pos. 7 in the diagram in Fig. 2, fig. 5). The bypass valve can be set in the following two ways:

The bypass valve must open when the pump is approaching a critical point where there is no water flow and the pump is operating on pressure only. Pressure in this mode can be determined by the pump characteristic.

Closing stage. After adjusting all Combi units, install the thermostatic head of the control valve if it is to be used as the primary regulator of the heating medium temperature. If the thermal fluid is regulated by means of a controller (e.g. K200), an analog actuator is mounted on the valve instead of the thermostat and the thermal fluid sensor of the controller is mounted in the thermostat socket. Do not forget to replace the plug of the primary circuit balancing valve. The unit is then ready to use.

We should emphasize that the adjustment of heating systems is one of the most complex engineering tasks in heat supply. The Valtec Combi pump-and-mix unit makes this job much easier. This node is a complete solution for the organization of the floor heating circuit in heating systems. Sophisticated configuration of the node allows you to avoid mistakes in the design of a particular system. The flexibility of the Valtec Combi control unit allows you to configure your underfloor heating system without the need for special fixtures.

Pump and mixing unit for underfloor heating Valtec VT.COMBI.0.180

VALTEC COMBIMIX pump and mixer unit (VT.COMBI.0.180) is designed to maintain a predetermined coolant temperature in the secondary circuit (by mixing in the return line). By means of this node it is also possible to link hydraulically an existing high-temperature heating system and a low-temperature floor heating system. In addition to the basic controls, the unit also includes all the necessary service elements: air vent and drain valve, which simplify the maintenance of the system as a whole. Thermometers allow you to easily monitor the unit without the use of additional devices and tools.

The VALTEC COMBI circulation and mixing unit for hot water floor heating provides a fluid with a temperature from 20 to 60°C by mixing the fluid from the return flow. Regulation is by a two-way valve installed in the supply manifold and controlled by the thermostatic head VT.5011 with a remote submersible probe located at the outlet of the mixing unit. (When a heating controller is used, the valve control function is transferred to it.) The balancing valve in the primary side determines the ratio of the thermal fluid from the secondary return flow to the primary flow. Other basic elements of the node: bypass with by-pass valve; integrated ball valves to turn off the circulation pump; automatic air vent; immersion thermometers.

It is recommended to complete the pump and mixing unit VALTEC COMBIMIX with pumps VALTEC series VRS-180 or other circulation pumps with mounting length 180 mm. The pump and mixer unit is adapted for joint use with manifold blocks with 200 mm centre-to-centre spacing and 32 mm axial offset. The dimensions of the mixing units allow them to be placed in manifold cabinets 135 mm deep.

Valtec Combimix pump-mixing units can be used in low-temperature integrated heating systems:

Manifold cabinet

One of the important points when designing a hot water floor heating system is to determine where the manifold cabinet will be located. To fix it in the wall it is necessary to make a hole of 60cm x 40cm and 12cm deep. In this niche and install the cabinet in which we will certainly place a mixing node for a warm floor Valtec. Mixing node. the main element of the underfloor heating, in which the mixing of hot water from the boiler and cold water from the return circulation system takes place.

It regulates the temperature and flow of hot water, connects circuits. All the necessary control and measuring devices are installed in this node, and with its help you can always maintain the set temperature and keep your home warm. When we install the cabinet, we first fix the ends of those pipes that supply hot water and send water to the boiler for heating. The pipe for underfloor heating must be made of reliable and environmentally friendly materials, at Valtec it can be multi-layer, polyethylene, or metal-plastic (standard size. 1.6 cm in diameter). These materials are characterized by resistance and resilience, they are quite durable, with a smooth surface. According to their characteristics they are thermally conductive, they do not corrode. Choosing a pipe for underfloor heating is not a simple task. Now it is engaged in a sufficient number of manufacturers, but the pipes Valtek proven to be positive. They will last a long time. about 50 years.

Feedback: Pump-switching node Valtec Combi. An essential element of water underfloor heating.

Everyone knows what a warm floor, but not everyone knows how it turns out.

That is what is intended pump and mixing node Valtec Combi.

The fact that a comfortable temperature of the floor is about 36-40 degrees. And boilers, working on radiators such as these and underfloor heating, in winter supply coolant with a temperature much higher than 40 degrees.

To reduce the temperature of the coolant that is fed into the warm floor and applies the unit.

In the photographs nodes will be presented with a pump Wilo 25/4. By the way the pump can be changed without draining the coolant. It is turned off by built-in node taps.

Operating principle is based on mixing

The main element of the operative temperature control of the warm floor is the thermostat head, which allows you to set the supply temperature of the coolant from 30 to 60 degrees. The thermostat head presses the valve stem to a weaker or stronger. depending on the set temperature. And the valve regulates the flow of heat carrier.

Thermometers are available for temperature control. They show the temperature of the heat pump incoming into the node, the temperature supplied to the underfloor heating loop and the return temperature.

Connector dimensions of the node. 1″ mounting length pump 180 mm.Thermal capacity of the node up to 30 kW.

The units are installed in a manifold system of combined heating and radiator / floor heating.Left collector radiators, in the center the knot of lowering the temperature, on the right collector floor heating.

The manifold is installed in the apartment. 5 radiators, 1 towel dryer and 4 underfloor heating circuits. Two in the kitchen, hallway and bathroom. The unit is not yet fully assembled. Thermal head with remote sensor is not installed:

The following photograph shows the same unit when fully assembled and operational. Heat generator. Bosch Gaz 2000 boiler. Photo b / w, because the picture had to be taken in low light conditions.

This pump/smnsystem is installed in a detached house with underfloor heating of 90 square meters:

The following pump/smns unit is installed and operating separately from the radiator heating in the cottage. It heats the underfloor heating on the first floor:

I apologize for the quality of the photo, the conditions of photography were far from ideal:

The following picture shows the unit installed in a private wooden house.

In this case we used a Grungfos UPS 25-40 pump.

I will not describe all the details and nuances of installation and configuration of the node, because this should do the expert.From myself I would add that the unit works, which is checked by time.

  • 1. Mixing valve MIX 03 3/4. 1 pc;
  • 2. 1-3/4-adapter nipple (VTr.580.N.0605). 1 pc;
  • 3. Circulation pump with coupling nuts for 1;
  • 4. nipple adapter 1-1/2 (VTr.580.N.0604). 1 pc;
  • 5. ball valve in.-socket. 1/2 (VT.218.N.04). 1 pc;
  • 6. coupling with in. threads. 16-1/2 (VTm.302.N.001604). 2 pcs;
  • 7. 3/4-1/2 (VTr.581.N.0504). 1 pc;
  • 8. Barrel 1/2 60 mm (VTr.652.N.0406). 1 pc;
  • 9. tee 1/2 in. (VTr.130.N.0004). 1 pc;
  • 13. ball valve.-on. 1/2 (VT.219.N.04). 1 pc;

The connectors (6) are used to connect a 16x2x2 metal-fibre floor heating pipe. The high-temperature circuit supply (boiler feed) is connected to pin 10, to pin 11. boiler return.

This is the easiest and cheapest solution for floor heating. This Valtec mixing unit should have been additionally equipped with an automatic air vent. At the inlet and outlet to the heating system 10, 11 it is desirable to mount american cocks.

valtec combimix. ideal for underfloor heating

The valtec combimix pump-mix unit is a rather complex unit for the average floor heating owner to understand. But you can’t do without it: it ensures uniform heating, reducing heat losses at the same time. Intended use of pump and mixer unit is to maintain the temperature in the loop, which was set, due to the secondary use of heated water from the “return. Thus, by automatically adjusting under the parquet (linoleum, laminate, etc.), the temperature of the water in the heating system is adjusted. п.) does not provide the temperature required by the heating system, but the temperature programmed by the user. the valtec combi 180 mm pump and mixer unit (valtec is a world-famous italian company, specializing in, among other things, the production of sanitary equipment) is in particular demand on the market.

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

The mixing unit has a conditional mixing chamber, through which the underfloor heating circuit and the boiler heating circuit pass.

Typically, the mixing unit of the floor heating has one parameter to adjust the water temperature in the contour of the floor heating. The TIM JH-1036 mixing unit has some kind of bypass, and it is also adjustable. And it is not the bypass balancing bypass that is triggered by the excessive head developed by the pump.

You can see the pressure balancing bypass in the photo on the rightmost cause.

I need it because it is possible to overlap all heating directions of the 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 someone prompt.

As for the bypass of the mixing chamber, you can find this graphic explanation of the bypass of the mixing unit:

over, it is not clear what the numbers on the scale mean and what the current value is tied to. 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 slit that overlaps when you turn it. Through this slot, the water can be pumped by the circulation pump, bypassing the conditional mixing chamber.

Note that the sticker with a scale of 0 to 5, can be put on arbitrarily.

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

The reference point for reading the scale value is the technological step on the mixing cabinet. With a scale value of 0, the slot is closed as much as possible. In this position, all the 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 at its maximum.

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 the bypass regulates not only the heat output.

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