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DO you know what they do and how the work?
Many will soon
DId you know that these are easy to test but so misunderstood..
These high/low and universal transducers are not just to act as safety devices on larger single ducted / multi AC and VRV/VRF multi.
Depending on the logic algorithms of any brand manufacturer AC's operating computer , they can create unusual problems when faulty, but in fairness make a unit work excellent and cost effective when they are normal.
If transducers are out of calibration by fault, they can prevent loading up (ramping) of inverter compressor or staging of constant speeds, false low gas fault warnings , reversing valves that do not engage in heating mode (because they use the low pressure transducer to show positive pressure displacement for RV gate change at a given RPM) and failure of indoor unit EEV's to open up and feed refrigerant. They set saturation temperatures for both heating / cooling modes and maintain them at a constant.
And.. if you have a multi outdoor condenser , there are many of them that might cause it.
Yet they are easy to test and diagnose. All you need is a manufacturer pressure/voltage chart (found in a service manual) , a set of gauges and a DC voltmeter. Then you can test them in seconds!!!!!!!!!!!!
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