WGU D169 EXAM 2025/2026 WITH 100% ACCURATE ANSWERS
Identify the pressure corresponding to 32 degrees F for R-123: ________.
a) 23 inches of Hg vacuum
b) 20 inches of Hg vacuum
c) 17 inches of Hg vacuum
d) 11 inches of Hg vacuum - (ANSWER)b) 20 inches of Hg vacuum
A hydrostatic tube test kit is used to: _________.
a) blow all water from the tubes
b) remove any water from the machine
c) vent refrigerant
d) determine if a tube leaks - (ANSWER)d) determine if a tube leaks
Excessive running of a purge system on a low pressure chiller generally indicates that the: ___________.
a) air sensors are faulty
b) ambient temperature is too high
c) efficiency of the purge unit is too low
d) system is leaking - (ANSWER)d) system is leaking
When recovering vapor from a low pressure refrigeration system: __________.
a) water pumps should all be on, and the recovery compressor should be off
b) system water pumps should be on, the recovery compressor should be on, and the recovery
condenser water should be off
c) the systems water pumps, the recovery compressor, and the recovery condenser water should all be
on
,WGU D169 EXAM 2025/2026 WITH 100% ACCURATE ANSWERS
d) system water pumps should be off, and the recovery compressor should be on - (ANSWER)c) the
systems water pumps, the recovery compressor, and the recovery condenser water should all be on
ASHRAE Standard 15 - 1994 requires equipment room refrigerant sensors for what safety group
classifications?
a) A1
b) B2
c) A2
d) All refrigerant safety group classifications. - (ANSWER)d) All refrigerant safety group classifications
If you are using a recovery machine manufactured BEFORE November 15, 1993, you must evacuate any
low-pressure appliance to _______ before making a major repair.
a) 0 psig
b) 15 inches of Hg vacuum
c) 25 inches of Hg vacuum
d) 25mm of Hg absolute - (ANSWER)c) 25 inches of Hg vacuum
A rupture disc on a recovery vessel for low pressure refrigerants relieves at: ________.
a) 5 psig
b) 10 psig
c) 15 psig
d) 20 psig - (ANSWER)c) 15 psig
The primary water source for a recovery unit condensing coil is: _________.
, WGU D169 EXAM 2025/2026 WITH 100% ACCURATE ANSWERS
a) chilled water
b) condenser water
c) local municipal water supply
d) de-ionized water - (ANSWER)c) local municipal water supply
Which of the following repairs that would ALWAYS be considered "major" under EPA's regulations?
a) replacement of an evaporator coil
b) replacement of a filter-drier
c) replacement of a switch
d) replacement of a purge unit - (ANSWER)a) replacement of an evaporator coil
According to the EPA, there is approximately ________ of refrigerant vapor left in an average 350 ton R-
11 chiller at 0 psig pressure once all the R-11 liquid has been removed.
a) None.
b) 10 pounds.
c) 20 pounds.
d) 100 pounds. - (ANSWER)d) 100 pounds.
A centrifugal chiller's rupture disk is connected to the chiller's: ________.
a) condenser
b) evaporator
c) liquid line
d) economizer - (ANSWER)b) evaporator
Identify the pressure corresponding to 32 degrees F for R-123: ________.
a) 23 inches of Hg vacuum
b) 20 inches of Hg vacuum
c) 17 inches of Hg vacuum
d) 11 inches of Hg vacuum - (ANSWER)b) 20 inches of Hg vacuum
A hydrostatic tube test kit is used to: _________.
a) blow all water from the tubes
b) remove any water from the machine
c) vent refrigerant
d) determine if a tube leaks - (ANSWER)d) determine if a tube leaks
Excessive running of a purge system on a low pressure chiller generally indicates that the: ___________.
a) air sensors are faulty
b) ambient temperature is too high
c) efficiency of the purge unit is too low
d) system is leaking - (ANSWER)d) system is leaking
When recovering vapor from a low pressure refrigeration system: __________.
a) water pumps should all be on, and the recovery compressor should be off
b) system water pumps should be on, the recovery compressor should be on, and the recovery
condenser water should be off
c) the systems water pumps, the recovery compressor, and the recovery condenser water should all be
on
,WGU D169 EXAM 2025/2026 WITH 100% ACCURATE ANSWERS
d) system water pumps should be off, and the recovery compressor should be on - (ANSWER)c) the
systems water pumps, the recovery compressor, and the recovery condenser water should all be on
ASHRAE Standard 15 - 1994 requires equipment room refrigerant sensors for what safety group
classifications?
a) A1
b) B2
c) A2
d) All refrigerant safety group classifications. - (ANSWER)d) All refrigerant safety group classifications
If you are using a recovery machine manufactured BEFORE November 15, 1993, you must evacuate any
low-pressure appliance to _______ before making a major repair.
a) 0 psig
b) 15 inches of Hg vacuum
c) 25 inches of Hg vacuum
d) 25mm of Hg absolute - (ANSWER)c) 25 inches of Hg vacuum
A rupture disc on a recovery vessel for low pressure refrigerants relieves at: ________.
a) 5 psig
b) 10 psig
c) 15 psig
d) 20 psig - (ANSWER)c) 15 psig
The primary water source for a recovery unit condensing coil is: _________.
, WGU D169 EXAM 2025/2026 WITH 100% ACCURATE ANSWERS
a) chilled water
b) condenser water
c) local municipal water supply
d) de-ionized water - (ANSWER)c) local municipal water supply
Which of the following repairs that would ALWAYS be considered "major" under EPA's regulations?
a) replacement of an evaporator coil
b) replacement of a filter-drier
c) replacement of a switch
d) replacement of a purge unit - (ANSWER)a) replacement of an evaporator coil
According to the EPA, there is approximately ________ of refrigerant vapor left in an average 350 ton R-
11 chiller at 0 psig pressure once all the R-11 liquid has been removed.
a) None.
b) 10 pounds.
c) 20 pounds.
d) 100 pounds. - (ANSWER)d) 100 pounds.
A centrifugal chiller's rupture disk is connected to the chiller's: ________.
a) condenser
b) evaporator
c) liquid line
d) economizer - (ANSWER)b) evaporator
