NEM Chapter 516, Refrigeration System Requirements Flashcards
Ship’s service air condition units are typically ___ cooled
Raw water cooled
New ship’s a/c units shall use refrigerant ___
R-134a
Existing R-12 ship’s service a/c units shall be replaced by R-134a units at the ___
Earliest opportunity
Existing R-22 ship’s stores refrigeration units shall be replaced by R-134a units at the ___
End of their service life
A reach-in chill and freeze box are considered self-contained equipment if the internal gross volume is less than ___
100 cubic feet each
New self-contained equipment shall use refrigerants that are ____
HFC, non-ozone depleting, have low global warming potential, and are classified as Safety Group A1 in ASHRAE 34
Refrigerants must be listed in ___ as an acceptable refrigerant under the EPA SNAP program
40 CFR 82
Represents how much a given mass of chemical contributes to ozone depletion over a given time period compared to the same mass of R-12
Ozone Depletion Potential
ODP
Ozone Depletion Potential
R-12 ODP is defined as ___
1.0
Represents how much a given mass of chemical contributes to global warming over a given time period compared to the same mass of carbon dioxide
Global Warming Potential
GWP
Global Warming Potential
Carbon dioxide’s GWP is defined as ___
1.0
___ oil cannot be used in the HFC refrigerant system
Traditional mineral
The use of ___ is required to ensure adequate lubrication and oil return to the compressor in an HFC refrigerant system
Polyolester lubricant (POE)
The POE oil is supplied in several viscosities
32 cSt
46 cSt
68 cSt
100 cSt
For CG applications, an ISO viscosity grade of ___ should be used. If this grade is not available, an ISO viscosity grade of ___ may be used
68
46
Upon receipt of a replacement compressor the installing activity shall drain the oil from the compressor and flush the compressor with ___ to alleviate the possibility of ____
Approved oil
Mixing oils when installed in the system
Standard brazing practice is to follow ___ or ___
Commercial practice
US Navy practice
Brazing requirements shall be modified as necessary to ensure copper to copper joints are brazed using a ___
Fed Spec QQ-B-654A, BAg5
Brazing requirements shall be modified as necessary to ensure stainless steel to copper joints are brazed using ___
Fed Spec QQ-B-654A, Grade V alloy
Freezer shall be set to operate at ___, cut off at ___ and cut on at ___
0°F
-3°F ± 1°F
0°F ± 1°F
Refrigerator shall be set to operate at ___, cut off at ___ and cut on at ___
33°F
33°F + 1°/0°F
35°F ± 1°F
