What is R416a used for?

A blend of R134a and R124. Used for medium temperature refrigeration or for automotive as a drop in refrigerant.

What is the PT chart used for?

PT charts are most often used for three purposes: to set a coil pressure so that the refrigerant produces the desired temperature, to check the amount of superheat above the saturated vapor condition at the outlet of the evaporator and to check the amount of subcooling below the saturated liquid condition at the end of …

What is refrigerant blend?

Blends are a combination of two or more other single component refrigerants. These blends have different chemical and interactive properties. Refrigerants are substances that are mixtures and undergo constant phase transitions from liquid to gas and vice versa.

What is R414B?

R414B Refrigerant R-414B (HOTSHOT)* is a blend of R-22, R-124 and R-142b with hydrocarbon R-600a (isobutane) added to improve mineral oil miscibility. This blend can be used to retrofit R-12 automotive air conditioning systems as well as stationary refrigeration systems.

What should superheat be?

When ambient air temp (Outside air temp) is 75-85 degrees the superheat should be 12-15 degrees, if the ambient temperature is 85 degrees or over the superheat should be 8-12 degrees.

What is superheat in HVAC?

Superheat occurs when that vapor is heated above its boiling point. Superheat is critical in HVAC because it ensures the liquid refrigerant is boiled off before it leaves the evaporator and heads to the compressor. Even small amounts of liquid can cause detrimental damage to the compressor in an HVAC system.

Why do blended refrigerants have to be charged as liquid?

As fractionation occurs, the vapour blend that hovers above the liquid is compromised, it’s not a complete mixture. This is why it’s important to charge this type of refrigerant as a liquid, to ensure the system receives the full blend.

What is bubble point in HVAC?

Bubble point (saturated liquid temperature) The temperature (for a given pressure) at which the liquid of a refrigerant blend (any 400- or 500-series refrigerant) begins to evaporate or boil. This is similar to the saturated liquid temperature of a single-component refrigerant.

What replaced Hot Shot 2?

An R-12 Refrigerant Replacement Freon Hot Shot™ 2 (R-417C) refrigerant is a non-ozone depleting, hydrofluorocarbon (HFC) replacement for these refrigerants.

What replaces R12 refrigerant?

R134a
There are three replacement refrigerant options for R12 systems: R134a, R401a, R401b. R134a is regarded, by manufacturers and adherents to the Montreal Protocols alike, as the best replacement refrigerant.

What happens if superheat is too high?

Too high of a superheat can cause the heat of compression to increase, causing the temperature at the discharge valves to increase. If the temperature increases beyond its safe operating temperature, it will cause damage to the compressor.