410A Questions Flashcards
Molina-Rowland Theory
Definition and Date
Theory that chlorine and bromine depleted the ozone layer
1974
The year that HCFC’s will be phased out?
2030
410A is what kind of Mixture?
Near-Azectropic
410A can only be used in equipment designed for it?
True or False
True
410A operates at Higher or Lower Pressures?
410A uses special cylinders, gauges and recovery equipment?
True or False
Higher Pressure
True
Latent Heat
Causes a substance to change state without changing its temp
Superheat
Refers as a vapor and above saturation temp
Compression Ratio
Absolute suction pressure
410A Compressors have a decreased or increased thickness wall?
Increased
Compressors designed for R-22 should never be used with 410
True or False?
True
R-22 Internal Pressure Relief
IPR
375-450 psig
410A Internal Pressure Relief
IPR
550-625 psig
Suction and Discharge pressures are with 410A(%)
Higher vapor heat capacity
50%-70%
High Pressure Switch Opens at
Psig
610 psig + or - 10 psig
High Pressure Switch Closes at
Psig
500 psig + or - 15psig
The subcooled liquid in the receiver may do what depending on the surrounding temp of the receiver?
Lose or Gain
Receiver Bypass is used for?
Bypass the liquid around the receiver and go directly to the liquid line and filter drier.
The Bypass does what?
Prevents sub-cooled liquid from sitting in the receiver and losing its subcooling.
Liquid Line Filter Driers no less than
Psig
600 psig
Can Liquid Lines used for R-22 also be used for 410A?
Yes, If sized and cleaned properly
The Flow Area in the Metering Device are designed to be
%
15% Smaller
The Evaporator or Indoor coil should be removed when changing out existing equipment and replaced with a 410A model?
True or False?
True
Service Pressure rating of(psig) needs to match
Some R-22 indoor coils can meet UL standards.
235 psig Always Confirm
A Overcharge does what?
High side pressure increase
When charging a 410A system in air conditioning mode you do what?
Put in as a Liquid
Cylinders without dip tubes must be?
Tipped upside down to get the liquid removed
When a Operating 410A system is running you charge on what side and as what?
Throttled in as a liquid on the low side
Throttling Valve
To ensure the liquid is converted to a Vapor
A manifold gauge can also be used as a throttling device?
True or False
True
When trying to clear a sight-glass you can overcharge the system?
True or False
True
Nitrogen Cylinders are shipped out at what?(psig)
2500 psig
Once you shut off the electrical power you have to?
Lock out tag out
A Cylinder of 410A should never get warmer then?
125F and 52C
410A Recovery Cylinders must be rated for?(psig)
400 psig
If ingestion occurs do not
Induce vomitting
When using 410A use these for safety?
Appropriate gloves and safety glasses
