NEM Chapter 516, Refrigeration System Requirements Flashcards Preview

Test stuff > NEM Chapter 516, Refrigeration System Requirements > Flashcards

Flashcards in NEM Chapter 516, Refrigeration System Requirements Deck (23):
1

Ship's service air condition units are typically ___ cooled

Raw water cooled

2

New ship's a/c units shall use refrigerant ___

R-134a

3

Existing R-12 ship's service a/c units shall be replaced by R-134a units at the ___

Earliest opportunity

4

Existing R-22 ship's stores refrigeration units shall be replaced by R-134a units at the ___

End of their service life

5

A reach-in chill and freeze box are considered self-contained equipment if the internal gross volume is less than ___

100 cubic feet each

6

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

7

Refrigerants must be listed in ___ as an acceptable refrigerant under the EPA SNAP program

40 CFR 82

8

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

9

ODP

Ozone Depletion Potential

10

R-12 ODP is defined as ___

1.0

11

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

12

GWP

Global Warming Potential

13

Carbon dioxide's GWP is defined as ___

1.0

14

___ oil cannot be used in the HFC refrigerant system

Traditional mineral

15

The use of ___ is required to ensure adequate lubrication and oil return to the compressor in an HFC refrigerant system

Polyolester lubricant (POE)

16

The POE oil is supplied in several viscosities

32 cSt
46 cSt
68 cSt
100 cSt

17

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

18

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

19

Standard brazing practice is to follow ___ or ___

Commercial practice
US Navy practice

20

Brazing requirements shall be modified as necessary to ensure copper to copper joints are brazed using a ___

Fed Spec QQ-B-654A, BAg5

21

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

22

Freezer shall be set to operate at ___, cut off at ___ and cut on at ___

0°F
-3°F ± 1°F
0°F ± 1°F

23

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