What is inside a low loss header?
A low loss header usually has a drain at the bottom of it. Hot water passes through the header at a lower pressure than it would pass through the rest of the system. This reduction in pressure and speed allows time for any dirt and debris in the system to sink to the bottom of the header.
How does a low loss header?
How does a low loss header work? A low loss header enables hydraulic separation by providing a separation point between the primary and secondary circuit, or multiple circuits. Low loss headers work on the principle that water will always take the path of least resistance.
Do I need zone valves with a low loss header?
A more simple way of connecting multiple circuits to a low loss header, without the need for zone valves or non-return valves that could potentially fail, is to install a distribution header. This is simply where the common pipe connecting the different circuits is sized, again, for a low velocity (sub 0.5mps).
Can you oversize a low loss header?
Low loss headers are sized in cubic metres per hour. NB: It is better to oversize your low less header than undersize. There is a rule of thumb for sizing low loss headers based on the principles that: The higher the output of the boiler, the larger the header diameter and longer the header needed.
What is a magnetic low loss header?
A magnetic low loss header allows flow separation within a hydronic system. This allows two flow circuits to operate with their own flow and pressure drop environments whilst effectively transferring heat from the heat source to the adjoined circuit as required.
How does a hydronic separator work?
A hydraulic separator reduces flow velocity, in the vessel, which allows for two secondary functions – air removal and dirt removal – in one device. 3-in-1 hydraulic separators make air removal and dirt removal primary functions, along with hydraulic separation, with no added piping connections or installation costs.
What is a shunt pump?
The boiler shunt pump circulates the water from the flow pipe into the return pipe or directly into the boiler. For certain types of fuel, very low temperatures can cause corrosion at the bottom of the boiler.
What is a low pressure header?
A widely accepted definition of a low loss header (LLH) is a device that provides hydraulic separation between separately pumped primary and secondary circuits. Hydraulic separation means that primary/secondary pump interactions are avoided, with primary/secondary pumps operating independently of each other.
What is hydraulic separation?
In essence, that is what hydraulic separation is: The ability of two or more circulators within the same piping system to simultaneously operate without interfering with each other. Think of hydraulic separation as the “broad topic,” whereas primary/secondary piping is one of several subtopics.
What is a hydronic buffer tank?
Buffer tanks are designed as the thermal energy battery for a hydronic heating system. They are used in almost every application and provide efficiencies to the heater unit allowing it to run in longer cycles. This reduces short cycling which is the #1 cause of failure in any type of hydronic heater.
What is a shunt valve?
The shunt is all inside the body, under the skin. The valve opens when the pressure in the brain gets too high. This lets fluid drain from the brain into the peritoneal space. From there, the extra fluid is absorbed into the bloodstream and filtered out in the kidneys. Then the body can pee out the extra fluid.
How does a low loss header work?
How does a low loss header work? By separating the two systems it allows boilers to operate at a constant flow rate in the primary circuit whilst flow rates and temperatures may vary in the secondary circuit. This avoids any interaction between the two and enables the primary circuit return temperature to represent the load on the system.
What is a low loss header on a boiler?
Boilers are safeguarded from irregular flows, ultimately increasing the life of the boiler. If installed vertically, low loss headers can help collect sludge from the system. Due to the low flow velocity through the low loss header, the debris from the system has time to fall to the bottom of the header and traps for safe removal via a drain valve.
Why is differential temperature important in a low loss header?
This helps ensure correct entry temperature into the secondary circuits by avoiding temperature dilution of the flow temperature along the low loss header. It is important that the volume of water circulating through the boiler loop is correct for the installed boiler output and design differential temperature.
How many pumps do I need for a low loss header?
Two pumps will be required in effect, one from the boiler to the low loss header and one from the low loss header to the heating system. Why use a low loss header?