RefrigerationQuestion 74 of 110
The saturation temperature corresponding to a measured pressure is found using what?
a.The unit nameplate
b.A duct calculator
c.A pressure-temperature (PT) chart or app for the specific refrigerant
d.The electrical schematic
Explanation
A pressure-temperature chart lists the saturation temperature for each pressure of a given refrigerant. Technicians use it to calculate superheat and subcooling from gauge readings. Each refrigerant has its own PT relationship, so the correct chart must be used.
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