EPA 608 Type 3 Questions and answers
100% Accurate, rated A+
On low pressure chillers, moisture typically enters the refrigerant system through - ✔✔air leaks from
areas with gaskets or fittings
The maximum test pre
...
EPA 608 Type 3 Questions and answers
100% Accurate, rated A+
On low pressure chillers, moisture typically enters the refrigerant system through - ✔✔air leaks from
areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: - ✔✔10 psig
Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11 chiller - ✔✔...
A hydrostatic tube test kit is used to: - ✔✔determine if a tube leaks
Commercial and industrial process refrigeration systems must be repaired when the leak rate exceeds
____ of the charge per year. - ✔✔35%
Refrigerant recovery typically start with liquid recovery it is faster. - ✔✔...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves at: - ✔✔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. - ✔✔2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. - ✔✔local municipal water supply
When recharging a refrigeration system with R-11, what vaporpressure is necessary in the shells before
changing with liquid? - ✔✔16.9" Hg vacuum
After recovering the liquid refrigerant you must: - ✔✔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. - ✔✔100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg vacuum can cause
the: - ✔✔system water to freeze
A system does not have to be evacuated all the way to the required level when: - ✔✔leaks in the
appliance make evacuation to the prescribed level unattainable
Which of the foloowing repairs would ALWAYS be considered "major" under EPA's - ✔✔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? - ✔✔warming the refrigerant
If you are using a recovery machine manufactored AFTER 11-15-93 you must evacuate an low pressure
appliance to _______ before making a major repair. - ✔✔25 mm of Hg absolute
After reaching the required recovery vacuum on a chiller, you should - ✔✔Wait for at least a few
minutes to see if the system pressure rises, indicating that there is till refrigerant in a liquid form or in
the oil
The pressure corresponding to 32 F for R-123 - ✔✔20 inches of HG vacuum
When evacuating a system the use of too large a vacuum pump can cause? - ✔✔trapped water to freeze
Refrigerant-11 at a pressure of 17 inches HG vacuum has a saturation temperature of: - ✔✔35F
During the evacuation of a system containing large amounts of moisture you can prevent freezing of this
moisture by increasing the pressure with______gas - ✔✔nitrogen
ASHRAE standard 15-1994 requires that each machinery room must activate an alarm and mechanical
ventilation beofre refrigerant concentrations exceed: - ✔✔the threshold limit valve and time weighted
average
The typical design burst pressure for a rupture disk on a low pressure centrifugal air-conditioning system
is set at_______ - ✔✔15 psi
Heat pumps that have been retrofitted from R22 to R407C should be leak checked with: -
✔✔pressurized nitrogen
When a new system has been assembled, the first thing to do is: - ✔✔pressurize the system with inert
gas and leak check
EPA regulations require that leaking commercial or industrial process refrigeration equipment must be
repaired when the leak rate exceeds______ of the charge per year. - ✔✔35%
Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored
in a refillable container. The refrigerant: - ✔✔can probably be charged back into the system
R-410A requires recovery tanks rated for at least: - ✔✔400 psig
to recover liquid refrigerant you must connect one hose to the - ✔✔liquid line
The primary water source for cooling the condenser of a water-cooled recovery unit is: - ✔✔local
municipal water supply
After refrigerant liquid has been recovered from a system, any remaining vapor is: - ✔✔condensed by
the recovery system
With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery
should first occur: - ✔✔from the liquid line entering the evaporator
the recovery of refrigerant from a system as a vapor only will minimize the loss of: - ✔✔oil
When using recovery or recycling equipment that was made after 11-15-93 you must evacute a system
containing MORE than 200 pounds of CFC-12 to ________ before making a major repair. - ✔✔15 inches
of HG vacuum
When using recovery or recycling equipment that was made BEFORE 11-15-93 technicians must
evacuate a unit that has a normal charge of 10 pounds of CFC-500 to _____ before disposing of the
system. - ✔✔4 inches of HG vacuum
To change the compressor on a system cantaining 40 pounds R-500 using a recycling machine that was
manufactured AFTER 11-15-93 you must isolate the compressor then: - ✔✔evacuate the isolated section
of the system to 10 inches of vacuum and hold. If the system pressure does not rise, remove the
compressor.
Recycling and recovery equipment maufactured after 11-15-93 does not need an oil separator -
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