REFRIDREATION Flashcards
Locations of refrigeration spaces
Fwd - 8Jz4 & 9Jz4
Aft - 7Qz6
Refrigeration BRd?
Bard 3007
What’s temp ranges for all compartments?
(4 types of compartments)
Cold room: -20°c
Cool room: 5°c-6°c
Combined dry provisions: 13°c
Bones stores 13°c
Types of gases on the refrigeration ?
R134A and R404A
Are the fridge gases flammable?
No
What’s HCFC and HFC
HCFC- Hydrochlorofluorocarbon
HFC- Hydrofluorocarbon
Does HFC have ozone depletion effect ?
No it does not
Type of oil used ?
SW 68
Is the oil hydroscopic ?
Yes
Why is the oil hydroscopic on the system?
To allow moisture to be absorbed when reps are cold instead of moisture into the gas system dues to the gases becoming waxed so it does not block the TEV
What’s the Montreal protocol?
Agreement to phase out harmful ozone depleting substances; CFCs, Halons, HCFCs
What’s the Kyoto summit ?
Agreement to reduce all green house gasses; co2, HFC, PFC
What’s the components of the system
Evaporator , compressor, condenser and TEV
Other components are the liquid reservoir,HP and LP trip and sight glass
What kind of bottles do we hold on board
Refrigerant bottles
Recovery bottles
Oxygen free nitrogen bottles
What are the different kinds of leak detection we use ?
IRLDS
Snoop
Spectral dye
Ultra sonic
What does IRLDS stand for ?
infra red leak detection system
What is in the fridge log?
How many fridges we have and where
The people certified to work on them
The amount of gas in the plants and bottles in KG’s
Maintenance conducted on the plants
Oils
What does OFN Stand for
O2 free Nitrogen
What is hydroscopic mean
It’s a type of oil that can absorbs water
How can the plant tell you if it is running low on gas?
-constant running,
-low HP/LP on gauges
-sight glass(bobbles only and clear)
What form would you need if there is a gas leak is it a major or minor type as well?
NSOR (Major)
Why do we use OFN?
