#4 EPA 608 Type III

R-123 at a pressure of 18.1 inches Hg vacuum has a saturation temperature of:

• 28°F

• 32°F

• 36°F

• 40°F

Why should the oil be removed from a low-pressure system at 130°F?

• 130°F is the normal operating temperature for oil in a low-pressure system.

• Less refrigerant will be contained in the oil at the higher temperature.

• Warmer oil has a lower viscosity and flows more easily.

• It shows that the heater is working.

What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks?

• Drain the water sides of the evaporator and condenser.

• Run the circulating pumps.

• Be certain the purge unit is operating.

• Open the condenser vents.

ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect;

• A1 refrigerants

• B2 refrigerants.

• A2 refrigerants.

• all refrigerant safety groups.

Charging liquid R-245fa into a low-pressure refrigeration system under a vacuum greater than 18 inches Hg vacuum can cause the;

• liquid to absorb excess moisture.

• purge unit to operate.

• system water to freeze.

• system water to boil.

Where does the purge unit on a centrifugal system take its suction?

• Top of the condenser

• Compressor oil sump

• Top of the evaporator

• Suction elbow

How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds that are being disposed of keep records of the event?

• 1 year

• 3 years

• 5 years

• 10 years

What is meant by the term "high efficiency purge unit?"

• Purge units that discharge a high percentage of refrigerant with the air they remove.

• Purge units that discharge a low percentage of refrigerant with the air they remove.

• Purge units that consume less than 5 watts of electrical power.

• Purge units which contain less than 50 lbs of refrigerant.

When does ASHRAE Standard 15-2013 require that each machinery room activate an alarm and mechanical ventilation?

• When the TLV-TWA (Threshold Limit Value -Time Weighted Average) is exceeded.

• When the UTL (Upper Threshold Limit) is exceeded.

• When the COP (Coefficient of Performance) drops 5% of the original value.

• When the EEL (Emergency Exposure Limit) is exceeded by 10%.

Starting in 2019, EPA regulations require that leaking industrial process refrigeration be repaired (or retrofitted or retired) when the leak rate exceeds;

• 5% of the charge per year.

• 10% of the charge per year.

• 20% of the charge per year.

• 30% of the charge per year.