Because of regulations put in place after the outbreak of legionnaire’s disease in the 90’s, installation of Domestic Hot Water (DHW) systems were changed for the sake of public safety. All DHW systems, whether storage based or tankless, must now meet the conflicting requirements of holding DHW at a minimum of 140°F (60°C) to comply with such standards as OSHA Technical Manual Section 3 Chapter 7, to combat Legionella growth, while delivering hot water at a temperature that prevents scalding injuries in sinks and other fixtures.
For decades, commercial plumbing installers have embraced a 3 way mixing valve or “tempering valve” as the perfect solution to the dilemma. Early tempering valves were controlled manually with fixed setpoints, but in 2020 we have evolved to using motorized valves under the direction of a standalone electronic control station that adds flexibility, reduces energy use, provides alerts and alarms, and generally improves the safety of any domestic hot water system. One of the most popular motorized tempering valve solutions continues to be the Heat-Timer ETV Platinum PLUS Electronic Tempering Valve (ETV). The ETV allows building owners to keep their water heaters and storage tanks above 140°F (60°C) while distributing hot water to users within a safe range. The Heat-Timer ETV control also has the ability to control a safety valve which shuts off the supply of hot water whenever the mixed outlet water exceeds an adjustable high temperature limit and provides a remote alarm to building managers.
One thing to consider even with a tempering valve system solution as advanced as the ETV, is the amount of time required for a contractor/plumber to plan, stage and install the entire system.
Consider that the basic system requires a sturdy frame to support and hold all of the components; the electronic tempering valve, safety valve, multiple pipes, unions, check valves and shut off valves, all need to be mounted to the frame while routing all piping connections in a neat and logical way to the Cold & Hot water supplies, water heater, recirculating loop and Mixed hot water output while allowing easy maintenance of the system. Low voltage wiring connections need to be made between the control module, ETV and temperature probes and a 120v, power wiring connection is needed for the ETV control module. The ability to mount the ETV control Module up to 500 feet from the valve offers increased flexibility for installation of system components.
Once completed all piping needs to be leak tested and all wiring needs to be verified for correct installation. Now, the system is ready for operation.
From years of experience, we can tell you that commercial plumbing contractors approach the challenge of installing a complete DHW system in one of three primary ways:
- Replace the existing defective equipment with new and upgraded equipment such as the ETV while trying to fit components into the existing piping system that may be plagued with system issues without addressing these issues.
- Installing the new equipment and attempt to address system issues without having the knowledge nor the experience, but with the best intentions of doing it right for their customer
- Installing new equipment and addressing potential system issues based on experience and knowledge that sometimes leads to an “over-engineered” project.
Regardless of the skill and experience of the installation team, none of these approaches will eliminate the on-site time and expense needed to fit, assemble and test all of the components required.
With Heat-Timer®, there is another, and better alternative – installing a fully integrated, pre-plumbed, pre-wired Electronic Tempering Station.
The Heat-Timer ETS Is the Pre-Plumbed Tempering Valve Solution Contractors and Engineers Have Asked For.
The Electronic Tempering Station (ETS) is a factory assembled and fully tested DHW system. Only five piping connections and a single 120V electrical connection are required to complete the installation. The entire compact system is mounted in a sturdy steel frame, ready to be bolted to a pad.
Once the mixed hot water requirements (gpm) of the building are known, designing a correctly sized DHW system is as easy as selecting the correct valve size. Once you’ve chosen a location, your only field work is to connect wiring for the 120v power supply and five piping connections. (Recirculation return, water heater/storage tank supply, Hot & Cold water supply and Mixed water outlet). The station also comes in both single and duplex (dual valve) configurations. The duplex models are designed for hot water distribution systems needing large quantities of safe tempered hot water, saving your customer money and you even more work.
Using the ETS, is Fast, Efficient, and Yes, Economical
The ETS is designed by an experienced engineering team, which ensures that the systems are fully code compliant. Heat-Timer® also provides detailed assembly drawings to allow contractors to accurately rough in the necessary connections. The money building managers and contractors save in installation time, raw materials, and quality generally pays for the cost of the ETS outright.
With the Heat-Timer® ETS, our contractors get the advantage of rapid, trouble-free installation and code compliance, while the building manager gets faster occupancy and an easy to service system with the advanced control and monitoring features of the Platinum Plus ETV control module.
The Heat-Timer® ETS is a win-win for everybody!