CIRO System Operations & Maintenance

Question 1

What is the purpose of purging non-condensable gases from an ammonia system?

Accepted Answer

To remove air and other gases that reduce condenser efficiency, increase discharge pressure, and waste energy

Answer

To add refrigerant to the system

Answer

To remove oil from the system

Answer

To test the system for leaks

Question 2

How often should ammonia system safety valves be tested or replaced?

Accepted Answer

Relief valves must be tested or replaced at intervals specified by jurisdiction and RAGAGEP, typically every 5 years

Answer

Never; safety valves are permanent

Answer

Only after an ammonia leak occurs

Answer

Every month

Question 3

What is the purpose of an oil drain on an ammonia system evaporator?

Accepted Answer

To periodically drain accumulated compressor oil from the evaporator, which reduces heat transfer efficiency when it coats tube surfaces

Answer

To drain condensed water

Answer

To remove excess refrigerant

Answer

To drain cleaning solution

Question 4

What daily operational checks should an industrial refrigeration operator perform?

Accepted Answer

Check pressures, temperatures, oil levels, sight glasses, compressor operation, and log all readings

Answer

Only check if the system is running

Answer

No daily checks are required

Answer

Only check the thermostat setting

Question 5

What is the importance of maintaining proper water treatment in evaporative condensers?

Accepted Answer

Preventing scale buildup, biological growth (Legionella), and corrosion that reduce heat transfer efficiency and system reliability

Answer

Water treatment is optional

Answer

Only aesthetics are affected

Answer

Treatment only prevents freezing

Question 6

What is the procedure for adding ammonia charge to a system?

Accepted Answer

Connect the ammonia supply to the system's charging valve, introduce refrigerant in the liquid phase to the receiver or high side, following safety procedures

Answer

Pour ammonia into the compressor

Answer

Add ammonia through the suction line as vapor only

Answer

No specific procedure is required