When the refrigerant is put back into a Type III chiller,
following recovery and system repair, where is it added? -
....ANSWER...The charging valve on the evaporator.
What method is used to find suspected water tube leaks in
chillers? - ....ANSWER...Hydrostatic (tube) test
What temperature should be attained when removing oil
from a low pressure system to ensure a lower level of
refrigerants in the oil? - ....ANSWER...130-Degrees F
The typical design burst pressure for a rupture disc is
what? - ....ANSWER...15 PSIG
,2|Page
Excessive moisture collection in the purge unit can
indicate what? - ....ANSWER...Tube Leakage
Vacuum pumps need to be capable of pulling what level of
vacuum? - ....ANSWER...500 microns
All refrigeration systems containing more than 50 lbs. of
refrigerant must be repaired when the annual leak rate
exceeds___? - ....ANSWER...35%
The most efficient method of leak checking a charged low-
pressure system is to use? - ....ANSWER...Controlled hot
water or heater blankets.
Systems with open drive compressors are prone to leak
where? - ....ANSWER...At the shaft seal.
What does ASHRAE standard 15 require? -
....ANSWER...A refrigerant monitor that will sound and
alarm and automatically start a ventilation system in
equipment rooms before the refrigerant concentration
reaches the TLV-TWA.
TLV-TWA - ....ANSWER...Threshold Limit Value, Time
Weighted Average
,3|Page
A-1 Group Refrigerants only require what? -
....ANSWER...Oxygen Deprivation Sensor
What are Cooling Towers? - ....ANSWER...They are heat
removal devices used to transfer process waste heat to the
atmosphere.
What is the maximum test pressure to use for pressurizing
Type III centrifugal systems with nitrogen? -
....ANSWER...10 psig
Enough vapor has entered the system and you may begin
charging liquid refrigerant when the refrigerant saturation
temperature increases to? - ....ANSWER...36F
After completing the transfer of liquid refrigerant between
a recovery unit and a refrigeration system, you should
guard against what? - ....ANSWER...Trapping liquid
refrigerant between the service valves.
, 4|Page
When pressurizing a system with nitrogen, you should
always? - ....ANSWER...Charge through a pressure
regulator.
What are the three "R's"? - ....ANSWER...Recover,
Recycle, and Reclaim.
In relation to the three "R's" what is Recover? -
....ANSWER...To remove refrigerant in any condition from
a system and store it in an external approved container.
In relation to the three "R's" what is Recycle? -
....ANSWER...To clean refrigerant for reuse by seperating
the oil from the refrigerant and removing moisture from
the refrigerant by passing it through one or more filter
dryers.
Can Recycled refrigerant be resold? - ....ANSWER...It
cannot be re-sold but it can be re-used.
In relation to the three "R's" what is Reclaim? -
....ANSWER...To process refrigerant to a level equal to
new (virgin) product specifications as determined by
chemical analysis.
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