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HVAC

Module 3

term
Ammonia requires the use of steel and aluminum for piping materials.
Similar operating pressures and temperature are required characteristics of a refrigerant to be used as a drop-in replacement.
An example of a mildly flammable refrigerant is HFO-1234yf.
HCFC-22 will no longer be manufactured beyond 2020.
What are the elements that make up a CFC? Chlorine, Fluorine, Carbon.
An HC refrigerant is used in blends to enhance oil return, usually at 3% or less of the blend.
What type of refrigerant has the lowest ozone depletion potential CFC's, HCFC's, or HFC's? HFC's
When charging a zeotropic refrigerant into an operating system, you should charge liquid through a metering device into the suction service port.
When charging a system that contains a near- azeotropic refrigerant you should charge with liquid refrigerant.
Class I refrigerants are typically supplied in drums.
In the Refrigerant A2L, the "L" classification according to ASHARE means that the refrigerant is mildly flammable.
Disposable cylinders of HFC-407C are colored brown.
When using a P-T chart for a compound refrigerant, knowing the saturated suction pressure enables one to find the saturation temperature.
Suction line temperature and suction pressure are the parameters needed to determine super-heat.
Dia-electric strength is the ability of an electrical insulator to withstand voltage.
PVE oil is not characterized as hygro-scopic.
A possible cause of oil not returning to the compressor is poorly arranged refrigerant piping.
Will using thicker copper tubing help prevent moisture contamination of a refrigerant system? NO
Pump the oil in from the original container when adding POE oil.
A new metering-device may be required when converting a system from one refrigerant to another.
To purge excess oil safely from refrigerant lines use dry nitrogen.
New equipment can no longer offer HCFC-22 refrigerant.
HFC-410A can never be used as a drop in replacement refrigerant for HFC-22 or R-22
On a P-T chart for a zeotropic refrigerant, the liquid pressure column represents the blue point.
Created by: rosi_23
 

 



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