Review Questions

Next let’s answer some review questions!

You may want the TdX 20 PT Chart for some of these.

No more R-22 will be imported into the US starting:
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How are blends different than a single constituent refrigerant such as R-22?
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Because blends have different pressures, Superheat & Subcool are critical.
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Pre-existing system issues such as low airflow, non-operational crank case heaters, improper oil levels will be magnified if not addressed before installing a replacement refrigerant.
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Since blends operate at different pressures, it’s very important to charge systems to proper:
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As a general rule, leaks less than _____ can be topped off.
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If the refrigerant blend is below the temperature that corresponds to the liquid pressure, it is ______. If it is above the temperature that corresponds to the vapor pressure, it is ______.
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What is TdX 20’s vapor pressure with a 40°F evaporator outlet temperature?
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What is TdX 20’s liquid pressure with a 105°F condenser?
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The first step to converting an R-22 system is to _____.
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When baselining proper system performance, you should address:
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Always charge a blend as a _____ ONLY.
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What is the Superheat of a system with R-458A operating at a suction pressure of 50.5 Psig and a suction line temperature of 65 degrees F?
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What is the Subcool of a system with R-458A operating with a liquid line pressure 208.1 Psig and a liquid line temperature of 95 degrees F?
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Systems with adjustable metering devices should be _______.
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Adjustable metering devices (TXVs) are typically tuned/adjusted:
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Electronic Expansion Valves should be programmed with the R-458A profile.
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What is the primary consideration when converting to TdX 20?
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Nailed it.

Now let’s get you registered for a Bluon account.

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