QHT Boiler manual

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B.4-WAY MIXING VALVE Installed with 3WOOD Boiler in Combination with Oil/Gas Boiler

1.A mixing valve arrangement is a method of controlling house temperature that is different than traditional American systems. In the average hydronic system, circulating or not circulating water of a fairly high and relatively constant temperature to radiation controls temperature in the house or zone. The thermostat used in such a system is a simple switch to a relay, which turns the circulator on and off. In a mixing valve controlled system, the circulator runs continuously, and the temperature of the water flowing to the house is varied by the mixing valve, which adds more or less cooler return water to the boiler-heated, water being pumped to the radiation. The valve is controlled manually by the homeowner (a very common system in Europe), or is controlled automatically by an outdoor reset control.

A system controlled by a mixing valve has several advantages over a conventional off/on system.

∙Fuel savings of 20%

∙Longer boiler life due to elimination of thermal shock to the boiler caused by surges of cold return water at circulator start-up

∙A quieter and more comfortable house, because heat is more even. Rather than having the heat turn completely on and completely off in response to heating demands, causing fluctuation in the house temperature, the heat is always “on” with the temperature of the radiation adjusting gradually to respond to the house’s needs.

In addition, a mixing valve arrangement has very important advantages for solid fuel burning hot water systems. Because there is constant circulation, there is always some heat being drawn from the boiler. Since a solid fuel is always generating a certain amount of heat, such a system will dispose of this heat efficiently. In conventional system, there is a grater possibility of the boiler overheating (when there is no circulation) and creosote formation (caused by the fire burning too slowly). A mixing valve system minimizes the possibility of either of those problems occurring, thus increasing both the safety and efficiency of the solid fuel system.

Mixing valve arrangements can be added to any of the systems described in this section or, in fact, to any conventional heating system as well. We recommend the 4-way mixing valve to control the temperature of the heating radiation. To mix wood heated boiler water with the return water from the distribution system, the boiler supply pipe must enter the mixing valve opposite the heating return pipe.

The following outlines a typical installation of a mixing valve controlled distribution system with a 3WOOD boiler in a system planned for solid fuel firing with back-up from a oil or gas-fired boiler.

1.The line from the 3WOOD boiler supply tapping goes to the oil/gas boiler supply pipe. Install a “tee” with a 1” branch in the line as close to the 3WOOD boiler as possible. This branch tee should point up and will route the piping to the “dump zone”. There must not be a valve or any potential restriction between the boiler and this tee.

2.Immediately after the “dump-zone” tee, install another tee with a ½ inch branch to install the L4006B aquastat to operate the overheat override.

3.In the boiler supply piping install an air purger and expansion tank sized to handle the water in the distribution system as well as the 3WOOD boiler.

4.Pipe the make-up water into the 3WOOD boiler and the oil/gas boiler through a Watts 1156F fill valve (pressure reducing valve) into the lower rear ½” tapping at the bottom of the 3WOOD boiler and also into the oil/gas boiler.

5.Install a tee with a 1” branch for the dump zone in the return tapping as close to the 3WOOD boiler as possible. Point the branch of the tee up.

6.The 3WOOD boiler circulator should be installed from the other pipe-leg of the tee to the return tapping of the gas/oil boiler.

7.The 3WOOD boiler circulator may be controlled by an outdoor reset controller operating the mixing valve, the oil/gas boiler relay or a Honeywell R845 or equivalent if the mixing valve is manually operated. This relay is controlled by the 3WOOD boiler Aquastat.

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Contents 3Wood Cast Iron Boiler Page Table of Contents Important Information Page Identification Procedure in Event of Power Failure Refueling the Boiler Wood Burning Wood Storage Procedure in the event of a runaway fire or chimney fire Chimney Cleaning Chimney ConstructionCoal Fire 3WOOD Design Technology with 3 PassInstallation considerations Layout of the Main Components Recommended Minimum Clearances No Galvanized Pipe Assembling the Casing Installation of Controls Installation of Draft Regulator Installation of Flue Gas PartitionChain must be exactly 32 inches long Commissioning the 3WOOD Boiler Or the handle3WOOD boiler piping and wiring Considerations 3Wood installed in combination with a oil/gas boiler Piping NotesPage Way Mixing Valve Piping Page Boiler Parallel Piping Page Page 59200628,59200629 Page Page Shutdown Troubleshooting System Checkout Warranty for Biasi 3WOOD Residential Cast-Iron Water Boilers Biasi S.p.A Verona, Italy

Boiler specifications

The QHT Boiler is an advanced heating solution designed for both residential and commercial applications. Known for its efficiency and innovative technology, the QHT Boiler has rapidly gained recognition in the industry for its unique features and superior performance.

One of the main characteristics of the QHT Boiler is its high-efficiency rating. Utilizing cutting-edge technology, the boiler operates at a remarkably high thermal efficiency, which not only reduces energy consumption but also lowers operational costs for users. This efficiency is achieved through smart design and effective heat exchange systems that ensure maximum utilization of fuel.

Another notable feature of the QHT Boiler is its compact and space-saving design. Many models are engineered to be installed in tight spaces while still delivering powerful heating capabilities. This is especially valuable in urban environments where space is at a premium. The boiler’s sleek design also ensures that it can blend seamlessly with modern home aesthetics.

In terms of technology, the QHT Boiler incorporates advanced control systems that allow for precision temperature management. Users can easily set and adjust the desired temperatures through an intuitive interface, whether via a digital display or a mobile application. This flexibility ensures that heating needs are met efficiently, providing comfort without excess energy use.

Durability and reliability are key characteristics of the QHT Boiler. Constructed from high-quality materials, the boiler is designed to withstand the rigors of daily operation while minimizing the need for maintenance. This reliability is crucial for both homeowners and businesses, as it translates to reduced downtime and long-term cost savings.

Sustainability is another critical focus of the QHT Boiler’s design. Many models are compatible with renewable energy sources, including solar thermal systems, allowing users to reduce their carbon footprint. The incorporation of features like modulating burners helps to adjust the combustion process to varying heat demands, resulting in lower emissions.

Safety features are also paramount in the QHT Boiler’s design. It includes multiple safety mechanisms such as pressure relief valves and flame detection sensors to ensure safe operation. These features provide peace of mind to users, knowing that the boiler operates within safe parameters.

In summary, the QHT Boiler represents a fusion of efficiency, advanced technology, and user-friendly design, making it a top choice for heating solutions. With its compact size, high-efficiency rating, innovative control systems, and commitment to sustainability, the QHT Boiler stands out as a modern solution for diverse heating needs. Whether for residential or commercial use, it meets the demands of today’s energy-conscious consumers.
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