≡ Boiler Retra-5M Plus 25 kW buy at a low price with delivery across Ukraine

Boiler Retra-5M Plus 25 kW

The boilers are designed for operation in central water heating systems with forced (closed pressure heating system) or natural (open heating system) circulation of the coolant in residential buildings, summer cottages, industrial and warehouse premises, retail facilities, and social and administrative buildings.

Optionally, the boilers are equipped with a fan and a control unit (controller) that monitors combustion and central heating pump operation (model Retra-5M PLUS). Retra-5M boilers operate with a mechanical draft regulator and require no electrical power.

Advantages of the Retra-5M series boilers:

The boiler design allows burning various types of fuel (coal, briquettes, wood, wood waste).
The arrangement of horizontal (convector) chambers provides a minimal effect of flue gas condensation, which significantly extends the service life of the boiler.
The boiler is adapted for operation with both a mechanical draft regulator and an electronic control system and air supply, which regulates the combustion process.
Warranty - 3 years!

BOILER STRUCTURE

The steel heat exchanger (1) consists of two parts: the lower part houses the combustion chamber (2), while the upper part contains straight horizontal partitions (3) (convector chambers), which form the heat exchanger's convection channels. The straight horizontal partitions and the heat exchanger walls are water-cooled, forming a so-called "water jacket." Combustion occurs in the combustion chamber on water-cooled grates (22), with an ash pan (11) located beneath the grates. Flue gases, after passing through the heat exchanger's convection channels, enter the chimney (4).

steel heat exchanger;
combustion chamber (firebox);
the partition is straight;
chimney;
rotary flue damper;
primary air diffuser;
branch pipe for draft regulator;
secondary air supply channel with damper for regulation;
secondary air injectors;
fuel ripper;
ash chamber (ash pan);
decorative casing;
loading hatch;
cesspool and ash removal hatch;
ash pit hatch;
feed pipe;
smoke duct cleaning hatch;
turning pipe;
safety valve;
drain pipe with ball valve;
thermal insulation layer;
grate;
inclined heat exchanger pipes;
thermomanometer;
control panel;
branch pipe for control panel temperature sensor;
traction regulator;
copper sleeve for installing a temperature sensor;
boost fan.

OPERATING PRINCIPLE OF THE BOILER

Water from the heating system enters the boiler through the turning pipe (18), spreads through the internal cavities of the heat exchanger, and, through its metal walls, absorbs heat from the fuel burning (by contact and radiation) in the furnace and from the gaseous combustion products (by convection in the remaining parts of the heat exchanger). Heated water enters the heating system through the supply pipe (16).

Lighting a cold boiler should only be done after ensuring the boiler is sealed and actually filled with water. The ashpit door must be slightly opened. Lighting should be done with dry wood for 0.5 hours, gradually increasing the boiler outlet water temperature to 70°C. The initial ignition of the Retra-5M PLUS boiler is performed without the supply ventilation system (with the fan turned off), regulating the air flow by opening the ashpit door, remembering to turn on the central heating pumps once the boiler outlet temperature exceeds 40°C (subsequently, when using the fan, the pump, which is connected to the controller, will turn on automatically).

For the first 3-4 days, it is recommended to operate the boiler continuously at an outlet water temperature of 70-80°C. Subsequently, you can program the boiler operation on the electronic controller according to the instructions provided in the controller (electronic control panel).

When lighting, it is not allowed to fill the entire combustion chamber (firewood - 50% full, coal, briquettes - 30%).

After ignition, the process and supply of primary and secondary air to the combustion chamber are controlled automatically:

in boilers of the “Retra-5M” model using a draft regulator;
in boilers of the “Retra-5M PLUS” model using an electronic control unit (controller).

The primary and secondary air distribution system in the Retra-5M PLUS boilers allows the boiler to operate according to the parameters set on the controller after all doors and hatches are tightly closed. The only role of the maintenance personnel is to promptly replenish the combustion chamber with fuel.