CHS type III

What type of appliance can a technician work on with a Type III Certification?

• Convenience store refrigerators

• Ice machines that fit under the counter

• Low pressure appliances such as chillers

• High pressure appliances such as heat pumps

Low pressure appliances operate...

• As a high pressure system.

• In a vacuum or below atmospheric pressure.

• Above atmospheric pressure.

Where does the purge unit take its suction from?

• The lowest point of the system

• The top of the condenser

• The evaporator charging valve

• The bottom of the condenser

What is the pressure relief device on a low-pressure chiller called?

• A vent pipe

• A purge unit

• An evaporator valve

• A rupture disc

What is the boiling point of R-123 refrigerant at atmospheric pressure?

• 0 degrees F

• 83 degrees F

• - 15 degrees F

• 26 degrees F

When charging a low pressure water chiller with R-123, charging begins with vapor, until what pressure is reached in the system?

• 25 "hg

• 18.9 "hg

• 0 "hg

• 84 psig

If the condensing temperature of a low pressure chiller is 100 degrees F, that means the high side pressure is:

• 19 psig

• 6.1 "hg

• 83 psig

• 6.1 psig

What do CFC-11, HCFC-123, HFC-245fa, and HFO-1233zd have in common?

• They all contain chlorine

• They are low pressure refrigerants that have low boiling points

• They are high pressure refrigerants that have high boiling points

• They are low pressure refrigerants that have high boiling points

What do low pressure appliances require since they operate below atmospheric pressure?

• A pressure relief valve

• A purge unit

• A condenser

• A process stub

What is the most effective way to leak test a charged low pressure chiller?

• Use controlled hot water or electric heating blankets to increase system pressure

• Use an open flame to speed up the system

• Add nitrogen to the system

• Use cold water and ice decrease system pressure