In today's market, pumping and mixing units for underfloor heating VALTEC and Oventrop deserve special attention. Designs are universal in use. "V altek" is designed to adjust the temperature regime up to 60 degrees Celsius, "Oventrop" up to - 90. When choosing a product, you should pay attention to the level of allowable pressure. In the first case, it is 10 bar, in the second - 6.
Quick comparison
Oventrop is convenient in the bath or bath, it is used to quickly warm up rooms. Manufacturers recommend laying pipes under a large layer of concrete. VALTEC excludes the presence of a pump in the package. Oventrop is ready to offer water heated walls and other interesting solutions used in conjunction with underfloor heating to achieve optimal conditions in the building.
Pumping and mixing units for underfloor heating VALTEC please with a large number of fittings, additional automation, which is very convenient for creating a "smart home" system. For more detailed information, below are brief characteristics of the devices.
VALTEC COMBIMIX Key Features
COMBI is a manifold block equipped with a thermostatic head with a separate immersion temperature sensor. The design is equipped with flow meters and manual fluid heating control valves, automatic air vents and drainage.
Pumping and mixing units for VALTEC underfloor heating are characterized by the following parameters:
- 1 inch (25.4 mm) cross section of manifolds.
- Number of nozzles – 12.
- Pipe section - ¾ inch, thread - external, connection according to the Eurocone standard.
- The temperature regime of the water in the system is up to 90 °С, the pressure is up to 10 bar.
- The length of the pumping system is 18 cm.
- Limits of temperature settings – 20-60°С.
- Flow rate - 2.75 m3/h.
Performance
Pump and mixing units for underfloor heating are used to create a circulating system of pipes with a low temperature regime of the liquid. Adjustment of a comfortable microclimate is carried out by controlling the flow of fluid and flow in the return, the relationship of the circuits.
Operation of mixing units is carried out in the heating system of floors, walls, open areas, greenhouse and greenhouse soil. The structures are used in conjunction with collectors, subject to a center-to-center distance of 20 cm. The pump-mixing unit for underfloor heating hassmall size, which is very convenient when placed in small areas.
What tasks does the COMBI system solve?
The knot allows you to increase the intensity of the passage of liquid in the floor loops and reduce the temperature to the set level. This is facilitated by mixing it with chilled water coming from the loops of the "warm floor" system. The COMBI system is designed for heat loads up to 20 kW.
The manifold cabinet has a distributor connected to the assembly for connecting heating circuits (to the right of the COMBI assembly). Balancing valves with a float flow meter are placed on the supply manifold for coordinated operation of the coils. If not balanced between the loops, the fluid will take a short path, ignoring the long loops.
The heated liquid enters the VALTEC floor heating pump and mixing unit through the thermostat valve. Installing a temperature sensor head allows automatic valve adjustment (open/close) to be achieved. Maintaining the specified heating of the liquid corresponds to the set level of heating of the “warm floor” system (20-60С °).
On the collector return there are adjustment valves for connecting servo drives that allow you to control the temperature in the rooms using a relay. Adjustment is carried out manually by means of the caps included in the package.
Block assignment
The pump and mixing unit for the underfloor heating system is designed to mix water from the radiator system with coldliquid coming from the contours of the "warm floor" system. It moves with the help of a circulation pump. From the assembly, the liquid enters the supply manifold and passes through the contours of the floor system. In this case, the temperature of the liquid decreases, heating the building, and returns to the collector. From the return, cold liquid passes through the assembly, the cycle repeats.
Temperature control
To adjust the temperature regime, a control valve with a thermal head is placed at the inlet of the unit. The scheme of the pumping and mixing unit for underfloor heating indicates the presence of an external temperature sensor placed in front of the supply manifold. Heating of the liquid in the system is set manually on the scale of the thermal head. With an increase in parameters, the valve automatically closes, stopping the flow of hot coolant into the unit. When the water cools, the valve opens access to the hot coolant. This makes it possible to ensure a constant temperature at the outlet of the unit.
To adjust the design ratio between the heated and cold liquid entering the pump inlet, two manual balancing valves are provided. The pump-mixing unit for underfloor heating, installed with your own hands, has the first valve on the return manifold. It allows you to adjust the volume of cold coolant entering the mixing unit. The second valve is installed at the outlet of the unit, in front of the connection pipe to the return circuit of the radiators. It helps to adjust the volume of heated fluid that enters the node.
Whenwhen the mode is set correctly, the thermostat valve takes the middle position and affects the increase or decrease in the supply of warm water to the unit. The setting facilitates the interconnected operation of the heating circuit with other room systems. In the absence of balancing, the VALTEC COMBIMIX pump and mixing unit for underfloor heating pumps more liquid through itself than required by calculation, taking it from other systems.
The need for thermal relay
For automatic temperature control, room relays connected to collector servo drives are used. While maintaining a comfortable microclimate in the room, heating is not performed, the valve is closed on the manifold. When the temperature drops below the set value, the thermal relay provides power to the servo drive, the pipe opens. When the loops are closed, the bypass valve of the assembly is activated, the liquid circulates in a smaller circle due to the bypass, preventing the pump from overloading.
How COMBI. S works
To work with the weather dependence sensor VT. K200. M, a pumping and mixing unit for underfloor heating VALTEC COMBI. S has been developed. Instead of a relay valve liquid thermal head, an analog servo drive is installed, which operates from the controller according to a schedule. For external temperature regimes, an appropriate heating of the coolant is provided. This affects the rare actuation of room thermostats when opening a window or door. Floor heating allows you to maintain an accurate calculated level, eliminating fluctuations around the setindicators from maximum (with open drive) to minimum. The comfort of the microclimate has a higher level.
On COMBI. S units, the temperature mode of the coolant is determined by the controller according to a user-defined schedule and sensor data for measuring the level of liquid and air heating. Similar devices include a pumping and mixing unit for Oventrop underfloor heating.
The circulation pump allows you to speed up the passage of liquid on the return line. Part of it comes from the supply circuit. During the reverse passage, the flow of the cooled liquid is divided into 2 parts, approaching the pumping system and the main unit. The ratio of the flow directed to the pump and the supply is adjusted through the valves. If the flow rate of the return pipe does not correspond to the set parameters (collector valves are closed), the bypass valve is activated, which is necessary for a constant flow of liquid circulating through the pump. External control of the operation of the unit is carried out by weather-dependent thermal relays.
Oventrop blocks
The system is designed to accommodate low-temperature heating circuits of a room with forced circulation. The main task of the device is to mix liquid from the return.
Knot classification:
- Bypass and lock-connecting group ("Multiflex" FZB, VCE and VZB).
- Rotary series ("Multiblock" TF and FZB).
- Corner version of devices ("Multiblock" T, "Multiflex" F VCE and FZBU).
- Pass-through device type ("Multiblock" T).
- Connecting group ("Multiflex" F CE, VCE and F ZBU).
- Pumping and mixing series ("Reguflur").
Characteristic features of knots
Design parameters:
- water supply - 3.5 m3/h;
- power - 90 W;
- temperature regime in the supply circuit - 50-95 degrees Celsius;
- working pressure limit - 6 bar;
- temperature settings - from 20 to 50 degrees Celsius;
- voltage - 230V/50Hz.
The blocks are used in underfloor heating systems and in selected Oventrop pumping stations. In the first case, they are connected to a metal floor heating manifold (eg Regufloor H model), allowing you to combine radiator and panel heating.
The Regufloor H unit is used for decentralized normalization of the temperature regime in the supply circuit. Its operation provides automatic mode in buildings up to 200 m2 and a heat consumption of about 75 W/m2.
Design features
Package includes basic items:
- Three-way valves equipped with connecting thread M 30x1, 5 mm, section 2 cm.
- Thermal relay with clamp-on sensors and heat-conducting base.
- Energy-saving circulation pump with built-in electric power control.
- Temperature controller with maximum limitation formaintaining an optimal microclimate.
To create a weather-dependent adjustment, the Oventrop manifold group of the Regufloor HW series is used. The unit is delivered ready-made for quick connection. It allows you to connect from 2 to 12 circuits and is used when connecting systems with 2-4 pipes.
The Regufloor HX series allows you to separate underfloor heating systems and radiator pipes by means of a heat exchanger. The control valve is located at the inlet of the primary circuit. Temperature parameters are set using immersion sensors in the secondary circuit
All pump and mixing units have positive customer reviews - both companies are tested and meet the basic requirements for quick installation and reliable operation.
