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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Charitywairimu. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.49. You're not tied to anything after your purchase.