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I was wondering if anyone could help please.
I have a quick college question.
Heat Pump -
HEATING MODE - Discharge to indoor coil, indoor coil to compressor suction.
COOLING MODE - Discharge to outside coil, indoor coil to compressor suction.
When these cycles are switched how is the refrigerant metered by the TEV's ? or are the refrigerant flows bypassed and only sent through only one TEV on each cycle ? - I assume one way valves on each side and a bi-flow filter etc..
Any imput ?
You will either have two metering devices (expansion valve/ accurator) in circuit one each for cooling or heating. Alternatively a two way device (capiiliary or electronic expansion valve).
In the case of the TEV they will usually each have a bypass circuit with a check valve. An accurator will only provide expansion in one direction, the expansion orriface being pushed out of the way when not required.
A capiliary is a fixed oriface and will provide the same pressure drop with flow in either direction. An electronic expansion device will regulate depending on the mode.
A biflow filter can be used but usually only a strainer is needed
Brit
Thankyou once again Sir !.
All the best
in addition whit the capillary there is the strainer,where inside is like a metal marble ho is correcting the flow ore amount of refrigerant.try and find an old unit and dismount it completely, open the parts as well. thats how i learned it in the old days. you understand the working parts better then.:oQuote:
Originally Posted by BritCit_Juve
Ice