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On low pressure chillers, moisture typically enters the refrigerant system
through - 🧠ANSWER ✔✔air leaks from areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: -
🧠ANSWER ✔✔10 psig
,Leak test and repair the chiller to reduce refrigerant loss from a pruge unit
on CFC-11 chiller - 🧠ANSWER ✔✔...
A hydrostatic tube test kit is used to: - 🧠ANSWER ✔✔determine if a tube
leaks
Commercial and industrial process refrigeration systems must be repaired
when the leak rate exceeds ____ of the charge per year. - 🧠ANSWER
✔✔35%
Refrigerant recovery typically start with liquid recovery it is faster. -
🧠ANSWER ✔✔...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves
at: - 🧠ANSWER ✔✔15 psig
According to ASHRAE Guideline 3-1996, if the pressure in a system rises
from 1 mm Hg to a level above ____ during a standing vacuum test, the
system should be checked for leaks. - 🧠ANSWER ✔✔2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. -
🧠ANSWER ✔✔local municipal water supply
, When recharging a refrigeration system with R-11, what vaporpressure is
necessary in the shells before changing with liquid? - 🧠ANSWER ✔✔16.9"
Hg vacuum
After recovering the liquid refrigerant you must: - 🧠ANSWER ✔✔recover
the vapor refrigerant
According to the EPA there is approximately _____ refrigerant vapor left in
an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid
has been removed. - 🧠ANSWER ✔✔100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29
inch Hg vacuum can cause the: - 🧠ANSWER ✔✔system water to freeze
A system does not have to be evacuated all the way to the required level
when: - 🧠ANSWER ✔✔leaks in the appliance make evacuation to the
prescribed level unattainable
Which of the foloowing repairs would ALWAYS be considered "major"
under EPA's - 🧠ANSWER ✔✔replacement of evaporator coil
Under EPA's regulation's _______ is used to pressurize a low pressure
chiller for the purpose of opening the system for a non major repair? -
🧠ANSWER ✔✔warming the refrigerant
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