What is the expansion valve in HVAC & How it
works ????????????
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HVAC expansion is Heating & ventilation air conditioning .
it normally used maintance used maintance tempearure level
inside the building
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when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard vibration level?
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who are me
What do you call a piston travel from TDC to BDC?
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What is space heater?
Explain different types of fits.
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