More very interesting information from Trane.
Dual Reciprocating Compressor Operation
5-ton model has a 2.5- and 5-ton compressors. It is like having two systems in one. The 2.5-ton is the 1st stage compressor and it operates at 50% capacity and runs independently. The 5-ton is the second stage compressor and it operates at 100% capacity and runs independently.
How reciprocating compression works.
On the downstroke of the piston, when pressure in the cylinder is less than suction pressure, the suction valve is pushed off its seat allowing refrigerant into the cylinder. The gas enters efficiently in a cylindrical pattern around the circumference of the valve.
On the upstoke, the suction valve closes preventing refrigerant from leaving the cylinder. When cylinder pressure exceeds discharge pressure, the large round discharge valve lifts completely off its seat allowing gas to efficiently exit the cylinder. If there is liquid present, flow dynamics resulting from tapered surfaces and valve proximity will allow the liquid to be purged from the cylinder without damaging the valves. Besides being gas flow efficient, Trane's valving is engineered to tolerate some liquid slugging.
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The gas enters efficiently in a cylindrical pattern around the circumference of the valve. Heating Repair Edmond
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