#1 EPA 608 Type III

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.

Which of the following is NOT required for an appliance that is using an ozone-depleting refrigerant to be mothballed (thereby extending the leak repair deadline)?

• Shut down the appliance temporarily.

• Evacuate the refrigerant from the isolated section or component.

• Evacuate refrigerant from the appliance to at least atmospheric pressure.

• Remove the appliance and store it in a warehouse at the facility.

Excessive running of a purge system on a low-pressure chiller generally indicates what condition?

• Faulty air sensors

• Leaking system

• Ambient temperature is too high

• Low purge unit efficiency

Where should the discharge from a rupture disc be piped for venting?

• Outdoors

• To the duct system

• To the evaporator

• Inside the machinery room

A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Which leak rate category is this chiller in?

• Industrial process refrigeration

• Ice making refrigeration

• Commercial refrigeration

• Comfort cooling

Where is the rupture disc located on a centrifugal chiller?

• Condenser

• Evaporator

• Liquid line

• Economizer

What should you do after reaching the required recovery vacuum on a low-pressure appliance?

A.

• Immediately disconnect the recycling or recovery equipment, and open the system for service.

• Wait for at least a few minutes to see if the system pressure rises before charging.

• Break the vacuum with nitrogen and open the system for service to begin charging liquid.

• Pressurize the system with nitrogen and perform a leak check.

Which component is particularly susceptible to leaks in low-pressure refrigeration systems with open ­drive type compressors?

• Chiller tubes

• Shaft seal

• Charging connections

• Shaft bearings

What is the result of raising the temperature of the room in which a low-pressure chiller is located?

• Lower pressure in the chiller.

• Faster refrigerant recovery.

• Delayed recovery.

• Reduced oil flow.

1. Which of the following statements about R-1233zd is FALSE?

• It is a SNAP approved replacement for low-pressure centrifugal compressor systems.

• It is being considered for applications where R-123 might have been used.

• It is suitable for air conditioning applications where cooling water is used (large chiller applications).

• It is mildly flammable.