Can you pump into a mixing valve?

Best practice is to pump away from the mixing valve, not into it. If there is no cold inlet flow, the thermostatic element will see only hot water and will close down the hot inlet port, deadheading the pump and reducing system flow.

How does mixing valve work on underfloor heating?

The tempering or blending valve is the heart of an underfloor heating system. It blends colder water from the underfloor heating system return with hot water from the heat source to supply the correct temperature of water to the underfloor pipework.

Why do mixing valves fail?

Inconsistent Hot Water Older model hot water mixing valves age over time and can break down with usage. As a result they can begin to fail in correctly controlling water temperature.

Do mixing valves have check valves?

– Thermostatic mixing valves must have integrated check-valves. – Thermostatic mixing valves must allow easy cleaning and disinfection operation.

What temperature should my underfloor heating manifold be set at?

Generally, underfloor heating systems will run at temperatures ranging from 35oC – 50oC. If the boiler or heat source cannot supply the water at the required temperature, either thermostatic or actuated blending controls can be supplied. Typically, a secondary circulating pump would also be required.

What temperature should underfloor heating run at?

Underfloor heating temperature – what should I set it to? This varies from person-to-person, but generally 21°C is the ideal temperature for living areas. Bedrooms tend to be set slightly cooler at 18°C. You can set this using your underfloor heating control panel.

Can a mixing valve be installed upside down?

In any position, the thermostatic mixing valve can be installed. Either upside down or sideways.

How does a mixing valve work in radiant floor heating?

A mixing valve is pre-installed in this type of manifold. The baseboard or cast iron radiator zones, for example, receive super hot water straight from the heat source. The much cooler radiant floor zones receive tempered water from the “mix” port of the mixing valve. The schematic below illustrates this approach.

What kind of valve is used in a radiant heating system?

Three-way and four-way valves, when used with actuating motors, have been installed in many radiant systems very successfully for years. The actuator adjusts the valve’s position to supply the appropriate mixed water temperature based on the heating load of the zone.

What does mixing mean in a heating system?

Mixing is when you take some cooler return water and “mix” it with some hot boiler water to supply a temperature of water that is lower than the boiler temperature but warmer than the return water. Are there different methods available for mixing? You can use a two-way valve, a three-way valve, a four-way valve or a circulator.

How is hot return water mixed with radiant water?

There, it mixes with some cool return water from the radiant zone. 2. A three-way valve mixes cool return water with hot boiler water to supply a “mixed” temperature. It has three ports, one for the return water from the radiant zone, one for hot water from the boiler loop and a mixed port to supply the radiant zone.