In consulting the R-134a pressure-temperature...

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Question 1 of 205eccef9dbacbc34ba4d45e5e

In consulting the R-134a pressure-temperature chart shown in the illustration, what would be the most likely normal running suction pressure for an air conditioner, assuming the space temperature is within normal range? See illustration GS-RA-11.

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🔍 Key Concepts

• Use the R‑134a pressure‑temperature chart to match a refrigerant pressure (psig) to its corresponding saturation temperature (°F). • In a comfort air‑conditioning system, the evaporator (suction side) usually operates well below the room/space temperature, but not close to freezing the condensate on the coil. • Normal room temperature is around 70–75°F, and typical evaporator coil temperatures for comfort cooling are often around 35–45°F below that room temperature.

💭 Think About

• First, decide what an approximate evaporator (coil) temperature would be for a space that is at a normal comfort temperature (around 70–75°F). Is the coil closer to room temperature, or significantly colder? • Once you estimate that evaporator temperature, look along the temperature column on the chart to find the closest matching value, then read straight across to the pressure (psig) value. • Compare that pressure from the chart to the four answer choices. Which one is nearest to the pressure corresponding to a realistic evaporator temperature for a normally operating A/C?.

✅ Before You Answer

• Verify that you are using the pressure (psig) column, not the vacuum column, for the suction side at normal operation. • Check that the temperature you pick (for the evaporator) is reasonable for human comfort air‑conditioning (not too close to 32°F, and definitely much lower than room temperature). • Confirm that the answer you select is the closest chart pressure to your chosen evaporator temperature, and that it is not a value more typical of very low‑temp refrigeration or high‑side pressures.

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