EPA Type III Study Guide

The _____________ is a common leak spot in systems with open-drive-type compressors.

• repair the leak in the system
• rotating shaft seal on the compressor
• top of the condenser
• Drain the water side of the evaporator.

Excessive operation of a purge system means _______________.

• increasing the system pressure with nitrogen
• the system has a leak on the sub-ambient pressure side of the system
• these systems operate below atmospheric pressure
• remove non-condensable gasses from the system

ASHRAE Guideline 3 states the chiller should be checked for leaks if during a standard vacuum test the pressure in a system rises from 1 mm Hg to a level above ___________. 2.5 mm Hg

• 15 °F
• B1
• 55 °F

The maximum test pressure for leak testing a low-pressure centrifugal chiller is

• 10 psig
• 10psig
• 15 psig
• 15psig

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?

• freezing of the water
• repair the leak in the system
• Warm the system.
• top of the condenser

To check for leaks in the water box (with water removed), place the probe __________.

• at the evaporator
• within 10 days
• in series
• in the drain valve opening

Leak testing a low-pressure refrigeration system at pressures above 10 psig could damage the __________.

• 15psig
• rupture disc
• outdoors
• liquid

Moisture can enter a low-pressure chiller from _______________.

• evaporator charging valve
• trapped water to freeze
• leaks at gaskets, fittings, or shaft seals
• repair the leak in the system

If a chiller is suspected of having evaporator tube leaks, what should be done before recovering refrigerant?

• Drain the water side of the evaporator.
• freezing of the water
• at the evaporator
• rotating shaft seal on the compressor

Excessive moisture collection in the purge unit indicates ____________.

• evaporator charging valve
• the chiller water from freezing
• the evaporator barrel tubes are probably leaking
• in the drain valve opening