AC&R Flashcards
Where are all 10 A/C are located?
1 & 2 - #1 AC Room 6-44-0E 3 & 4 - #2 AC Room 7-180-0-E 5 - #1 MMR 6 - #2 RAR 7 - #2 MMR 8 & 10 - #3 AC Room 5-200-0-E 9 - #4 AC Room 7-25-0-E
What load centers power each A/C plant?
1 & 2 - LC 21 3 & 4 - LC 71 5 - LC 43 6 - LC 44 7 - LC 61 8 & 10 - LC 73 9 - LC 12
What are the phases of the refrigeration cycle?
Compression
Condensation
Expansion
Evaporation
What are the major components of an AC unit?
Compressor Condenser Receiver King Valve Orifice Evaporator AOP
What is the minimum/maximum pressure for the expansion tank?
67 Minimum
90 Maximum
What should chill water set point?
44 degrees Fahrenheit
What order should be given if you notice a low oil level on an A/C plant?
24 hour oil recovery
On the parasense what does the following light means? Red Steady/Flashing red/ Amber steady/ Flashing Amber/ Green steady/ Flashing green?
Green: Power Available FG: System Fault Amber: Alarm in last 12 hours FA: Alarm low level Red: Alarm level FR: Exit space
What should you do if there is an “out of parameter” reading on any AC&R log?
Investigate why it’s out of parameter Annotate the reason why Circle it read If you don’t know the reason Contact A/C & R Sup that’s on watch
How many chill box and freeze box are onboard?
2 Chill Box
3 Freeze Box
List all chill box and freeze box location.
34 Freeze box: 5-34-0-L 44 Freeze box: 4-44-0-L 44 Chill box: 5-44-0-L 180 Chill box: 5-180-0-L 190 Freeze box: 5-190-0-L
What is the maximum tonnage of an AC plant?
375 tons
How do you prevent an AC from surging and what are the correction action?
Raise Chill Water set point to 46 Degrees Fahrenheit when operating with condenser water inlet temp between 96-100 degrees Fahrenheit
Raise to 50 greater than 100
How many MRU onboard?
18
What are the 4 operating modes if the MRUs?
Stand by
Normal
Back up
Fan only
