How A Reversing Valve Works: Heating Cycle & Cooling Cycle

This is a look at how a four way reversing valve works. I'll explain the construction, the parts, and how they work together for both the heating cycle and cooling cycle.
This is an excellent resource for fellow technicians who will be taking the NATE Exam. If you have any questions, please comment or email me.
Thanks for watching!
- David
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** Please do not attempt this at home. Only a Licensed HVAC technician or Licensed Electrician Should Attempt what is shown in our videos. They are just for reference only.

[@ApartmentMaintenance]

Great explanation 👍

[@matthewwong1884]

thank you

[@SeanBZA]

I find by me though that the reversing valves all will do cooling when de energised, and switch to heat only when powered. Probably because here the units spend the vast majority of the time in cooling mode, and you might only need heat for around a month or two in winter. Saves around 20W of power for the majority of the year, and when you need the heating the extra power outdors hels keep the outdoor unit warm so it does not build up too much ice.
The valves are used so rarely that often you find that they seize fast in the one position, and will not change over when commanded. They also can fail and bleed through from the high pressure side to the suction side, dropping your efficiency. They are not worth replacing, just remove, do the 2 shunt loops, and program the indoor unit in a split to be a cooling only unit.

[@handyhamby5513]

Rheum Rudd weather king energies in heat