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All installations and services must be performed by qualified service personnel.
Example 3:
Problem: Refrigerant measurements are made on the cooling system of a typical
OPB installation. The suction line pressure, measured at the condenser unit,
suction line, charging port, is 135 PSIG. The temperature of the refrigerant
(R410A) at the evaporator suction line connection is measured as 55°F. What is
the degree of superheat for this system?
Solution: Calculate the pressure of the refrigerant at the evaporator suction line
connection. With the estimated refrigerant pressure and measured temperature
at the same point, tabulated data on R410A from the refrigerant manufacturer,
or ASHRAE, can be used to evaluate the degree of superheat.
135 PSIG (Suction pressure measured at condenser)
+ 0 PSIG (Added for pressure drop of suction line)
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135 PSIG = Estimated pressure of refrigerant at evaporator exit
From the R410A pressure/temperature chart, at 135 PSIG, the saturation
temperature is approximately 47°F
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