Understanding Refrigerant Pressure Gauges

What does the compound pressure gauge measure on the low side of a system?

• High-side pressure in psig

• Low-side pressure in psig and vacuum in inches of mercury (Hg)

• Temperature in degrees Celsius

• Refrigerant flow rate

What is the typical range for most high-pressure gauges?

• 0 to 400 psig

• 0 to 600 psig

• 0 to 800 psig

• 0 to 1000 psig

What is the purpose of the center port on a manifold?

• To measure temperature

• For recovery, evacuation, and charging connections

• To measure humidity

• For air filtration

What additional feature might an electronic manifold have?

• Built-in refrigerant storage

• Combined temperature probes for calculating system superheat and subcooling

• Automatic refrigerant recycling

• Integrated vacuum pump

What does the EPA recommend for hoses to minimize refrigerant loss?

• Use of high-pressure hoses

• Use of low-loss fittings or valves that close automatically or manually

• Use of longer hoses

• Use of hoses with larger diameters

What is considered a de-minimis release of refrigerant?

• A major leak during system operation

• A minor release when connecting or disconnecting hoses for service or recovery

• A release due to equipment malfunction

• A release during refrigerant manufacturing

What is the legal status of a de-minimis release of refrigerant?

• It is considered unlawful

• It is considered lawful

• It requires immediate reporting to the EPA

• It requires a fine

What is the primary function of low-loss fittings on hoses?

• To increase refrigerant flow

• To minimize refrigerant loss

• To enhance pressure readings

• To improve temperature accuracy

Which color is usually associated with the center port hose on a manifold?

• Red

• Blue

• Yellow

• Green

What is the main purpose of using a manifold in refrigeration systems?

• To measure electrical current

• To control air flow

• To measure and control refrigerant pressures

• To filter refrigerant