Among the numerous equipment that participates in the heating systems "warm floor" can be detect small priborchik, plays an important role in the management and regulation of heating system. This actuator, an electromechanical device, without which it automatically adjusts the temperature to warm water floor is not possible.
The device is based on the change of reaction electrothermal heating the coolant temperature in the main flow pipe and subsequent mechanical action to provide for the opening or closing of complex flow of hot water in heating contours. Servos, or servos, official language professionals a device called an electrothermal actuator, today present in almost all the autonomous heating systems. New suburban residential buildings, cottages and villas equipped with underfloor heating, have to equip a warm floor, which is controlled by servomotors. It servo installed for floor heating collector, has the task of adjusting the flow in the water floor heating system.
Existing types of actuators for today
Among the currently existing regulators, Spread in the home, the following servos found. All devices can be divided into several types. Each species is different principle of operation and functionality. There are two types according to the type design of the device:
- closed;
- open.
Name may be judged on the principle of action. For closed servo characteristic is the open position in the absence of power. Incoming signal actuates the mechanical part, blocking access of water to the system. For an open type device, the operating principle in reverse. Normally, the servo is closed, only the receipt of a mechanical part of the signal is actuated by opening the water inlet to the conduit. About what kind is best suited for everyday use, you will be judged by assessing its own heating system features and climatic conditions outside. The most commonly used in our country normally open actuators.
On a note: at failure of the device, the coolant continues to circulate in the pipeline leaving the floor warm for some time. This feature is particularly relevant for country homes located in cold climate zone.
By the method of power servos are divided into devices, feeding a constant stream 24V and the device connected to the conventional AC power 220V. powered servos 24V equipped with inverters.
Often, consumers are using one, is a rare type devices. We are talking about devices that are set to the normal position, depending on the technological requirements of the heating system. Such actuators are called generic and can change the functionality of a normally open state to normally closed state, and vice versa.
Connect to the collector can be all three servos. The only condition is the correct setting, balancing and operating conditions of the heating system.
The criteria for selecting the type of actuator
This section will try to answer the question. What is the basis selection of devices of a particular type.
If vyreshili equip its heating system "warm water floor" servos, consider the parameters of your heating operation. In what position most of the time must be in valve. In that situation, when for you a warm floor is the main living space heating option when hot coolant constantly flows into the pipeline, bet on the servo normal open. This form is ideal in conditions of prolonged heating season.
On a note: at faults with electric supply, component failure will not stop the circulation of warm water in the heating water circuit. Underfloor heating will continue to supply treated water coolant.
For regions with a warm climate suitable servomotor normally closed. If you are not afraid of the defrost heating circuit and you will periodically turn on the floor heating, this device will help to cope with their functions.
Important! Servo for underfloor heating with continuously adjustable electronic type have control. Such devices are more accurately respond to changes in the temperature of the coolant flow smoothly translating the rod in the desired position. Servo motors with infinitely adjustable designed for underfloor heating, which is often necessary to perform the dosage amount of the incoming stream.
In most cases, such devices in home heating systems with heating floors are not used. Therefore, when buying a note is required or not to the instrument electronic regulator assembly. If the manual says that such equipment is necessary, it means that you are dealing with an electronic actuator. Let us say at once, such a device to use at home impractical and uneconomic.
Be sure to read how to do water floor from a gas boiler?
Design and operation of servomotors
The main operating element of the actuator is a bellows. Those. the same detail as in three-way valve. Small in size, the cylinder is sealed with an elastic casing filled with a substance, responsive to temperature. Depending on whether there is an increase or decrease in temperature, change in volume occurs respectively substance. Drawing - diagram demonstrates the servo device, where the main place is occupied by the bellows.
The bellows is in close contact with an electric heating element. Receiving a signal from the thermostat, the heating element is switched by the network and included in the work. Inside the bellows material is heated and expands. Thus, increase in size cylinder begins to push on the plunger, changing its position and blocking the path of coolant flow. Assessing the servo operation can be concluded - the device is not equipped with any motor, it has no gears and gear units. Normal working relationship "thermal energy and electricity." Hence the common name of devices, thermoelectric regulators.
In order to open the valve become again, the whole process is repeated in reverse direction. A power failure causes the heating element ceases to work. Consequently, the substance within the cylinder cools, decreasing in volume. The pressure on the plunger is reduced, it rises, acting on the valve and, therefore, opens access to the hot water system.
On a note: substance placed inside of the cylinder - toluene having high thermodynamic characteristics. An electric heating element is a nichrome filament.
After reviewing the principle of operation of the device, it is important to remember that the mechanical action of the valve requires a certain time. Despite the fact that when a signal from the thermostat, the heating element begins to heat the material within the cylinder. The time required to change the physical state of the liquid is about 2-3 minutes, so the valve is actuated at once.
For reference: the choice of servo patterns note the parameters of the heating element and a liquid heating time specified in the device data sheet.
Unlike heating, cooling fluid passes more slowly. In the reverse process, i.e., at the closing of the valve is no longer required for 2-3 minutes and 10-15 minutes. In case of overheating, each servomotor must be switched off. For this emergency shutdown mechanism is provided in the structure.
For example: the collector used in servo band, not all cylinders and cylinders equipped with the substance. Eating pattern in which the role played by thermocouples reminding a spring or plate, which under the action of the same heating element is heated. Expanding these parts act again on the stem, leading eventually to the operating status of the valve. To determine what position the valve is located, it is possible to change the appearance of the servo. Retractable element signals the operation of the device. If it does not, it means that your device is not connected properly or the heating system is malfunctioning.
For reference: hot to the touch servo means is closed and disconnected in this case the device. If the device cool to the touch, hence the valve is open, the coolant normally circulates in the water circuit of floor heating.
Installing the servo. Features and nuances
Before mounting the actuator, decide the device will have to interact with any type of thermostat. In cases where the thermostat controls the operation of the water circuit, both devices directly communicate with each other by wires. When it comes to using the multi-zone thermostat device serving multiple pipelines, connection servo is performed as follows.
To properly connect all the wires and terminals used underfloor heating switch. In this device functions include connection and connection devices of various purposes in a single chain. In addition to distribution and communication functions, the switch still plays a role, and the fuse. In situations where the shut-off valves are all closed water circuits, the switch turns off the circulation pump power.
The switch is very useful in cases where the underfloor heating powered by a standalone automated gas boiler. The figure shows how the connected thermostats and actuators to a single control system.
Place setting servo thermostatic valve mounted on the manifold.
Important! When the system underfloor heating from coal-fired boiler, a function switch, as disabling pump fraught stop of the heating device. Setting the bypass and bypass valve allows you to avoid stopping of the pump and the operation of the heating device in idle.
findings
It should be noted that due to the emergence of modern devices and devices, control and regulation of underfloor heating has become commonplace and simple process. The design of many devices used for heating circuits, a special difficulty is different. Concepts and principles of work of many components and assemblies. It can safely be said about the servo. Devices for the most part are reliable, practical, and easy to operate. Due to servos became possible to fully automate the system control underfloor heatingDo the terms of use of heating equipment simple and straightforward.
Choosing a simpler version, you can do the installation of conventional control valve. Automatic controllers, sensors & actuators, devices category, working on your comfort and safety. Installation of additional equipment, such as switches and relief valve, make your heating system as effective and safe.
