As most HVAC professionals already know, tempering valves (sometimes referred to as hot water mixing valves or thermostatic mixing valves) are used to blend hot and cold water together in a domestic hot water delivery system. The resultant water at a reduced temperature is sent through the delivery system at exactly the right temperature for use at the sink, the shower etc.

Mixing valves like this solve a particular problem in the delivery of hot water in large buildings, during periods of peak demand. Hot water in the storage tank must be kept above 140 degrees Fahrenheit to prevent the growth of harmful bacteria. Yet water at this temperature would instantly scald and burn anyone putting their hand under it.  By mixing the hot with cold water, and monitoring the “set point” temperature carefully, these valves ensure that water at the desired set point is delivered to users at all times and under all load conditions. See our discussion for a detailed explanation of the issues surrounding domestic hot water control and tempering valve operation.

In applications at hotels, nursing homes, hospitals, day care centers, schools, factories and universities, the mixing valve function is super critical, providing both tenant comfort and avoiding the injuries (and lawsuits) that come with a broken delivery system. In these applications, motorized tempering valve solutions with associated computer controls, are overwhelmingly preferred by commercial plumbing professionals due to their increased temperature accuracy, ability to adjust dynamically to load conditions, and better fail-safe capability.

How to choose a Motorized Tempering Valve Solution

Heat-Timer® introduced its first motorized tempering valve solutions over 2 decades ago and after thousands of deployments, we’ve developed a complete understanding of what professionals look for when designing or upgrading domestic hot water solutions. The ETV Platinum Plus is now the most sophisticated, and reliable motorized mixing valve in the world because it incorporates everything that professionals in the field have asked us for into its design.

1. A stainless steel valve body.
   
2. Motor does not come in contact with water at all.
3. Sensor accuracy is close to 1 degree Fahrenheit.
4. Full PID logic implementation quickly restores water temperature even after large changes in load conditions.
5. Unlike standalone valves, the Heat-Timer® ETV platinum plus can shut down water flow at both the valve and the primary supply, offering better protection against scalding in safety critical applications.
6. Can provide both alarm condition detection as well as temperature control (ETV Combo)
7. Comes in a fully plumbed version, the ETS (Electronic Tempering Station) that makes installation as simple as connecting hot and cold water.
8. Control can be placed up to 500 feet away from valve for centralized monitoring with easy to read display.

For busy plumbing professionals who want maximum ease of installation, Heat-Timer® also offers the Electronic Valve Station (ETS). This station effectively incorporates the ETV motorized tempering valve into a completely pre-plumbed assembly that includes the fully integrated control module. Simply connect hot and cold water and plug it in. Then program your set point and you are up and running. This solution is available in all standard piping sizes directly from the factory without need for special ordering.

For more information on our complete line of motorized tempering valves and domestic hot water system solutions, call our team today.

Original content posted on https://www.heat-timer.com/understanding-commercial-tempering-valve-systems/

A tempering valve mixes hot and cold water to create water at the perfect temperature to distribute to sinks and showers. They are typically used in hotels or office buildings, anywhere where there is centralized delivery of hot water. If the water delivered is too warm, scalding can occur. If stored water is too cold, bacterial growth can occur inside the tank. The tempering valve allows hot water to be stored at a high temperature that will kill off bacteria, but then mixes it with cold water to distribute to the fixtures at a lower temperature that will not scald users.

Temperature ranges for domestic hot water systems

If water is stored below 140℉, bacterial growth can occur that can have serious health risks to building occupants. The most common bacteria is Legionella, which has been known to grow in domestic hot water systems, as well as cooling tower water. In order to kill off any existing bacteria and discourage new growth, water must be stored above 140℉. For domestic hot water systems this means that the storage tank must be maintained above this temperature. However, scalding will certainly occur if water that hot is piped directly to a sink or shower. Depending on local code hot water to fixtures should be in the range of 115-122℉. The tempering valve is installed at the outlet of the hot water storage tank, and its output is then piped out to the hot water distribution of the facility.

How a tempering valve works

There are several types of tempering valves in use today. They are all 3-way valves, meaning that they have two inputs (hot and cold water) and one output (tempered hot water). They are named based upon the type of control used to maintain the tempered hot water temperature.

A thermostatic mixing valve (TMV) has a fixed set-point and precise water temperature control. The controls are all internal to the compact valve, which is simple to install and easy to maintain.

An electronic tempering valve gives operators more flexibility by being able to adjust the set-point, monitor performance remotely, and access information on a control screen mounted away from the actual valve. These are good choices when more active monitoring of the water temperature may be required.

An example of a robust electronic tempering valve is our Heat-Timer® ETV Platinum Plus Control which can be located up to 500’ away from included control panel. This panel can communicate to larger EMS or BMS systems in the building and perfectly controls the flow of hot water through our motorized 3 way tempering valve.

Typical thermostatic and electronic valves need to be installed into the piping system by the contractor, and often require many field connections and thermostats to be hooked up correctly in order for the system to function correctly. Electronic tempering stations are a pre-plumbed unit that only need to be hooked up to hot and cold water and power, avoiding manual connection of the valve and the sensors in the field. This saves installation time and provides a more robust installation. For more information see our product page on the Electronic Tempering Station (ETS).

Plumbing Professionals Trust Heat-Timer® Valves

Heat-Timer® is dedicated to providing the highest quality domestic hot water valves on the market. Our team of technical experts can help you pick out the right valve for the job, be it a school, retail center or resort. You can rest easy knowing your systems are being reliably controlled for occupant safety and energy savings.

Contact us today and speak to a technician or visit our website at https://www.heat-timer.com.

Original content posted on https://www.heat-timer.com/what-is-a-tempering-valve/