What does low subcooling and low superheat mean?

While superheat indicates how much refrigerant is in the evaporator (high superheat indicates not enough, low superheat indicates too much), subcooling gives an indication of how much refrigerant is in the condenser. Higher subcooling indicates excess refrigerant backing up in the condenser.

What does low subcooling indicate?

Low Subcooling is an indication that not enough refrigerant is contained or “packed” in the condenser. This can be due to undercharge, poor compression, or a metering device oversized or failing open (overfeeding).

What causes low subcooling low superheat?

LOW SUPERHEAT LOW SUBCOOLING This could be caused due to low airflow or due to plugged coils in an evaporator. When there is limited heat load in the evaporator and limited refrigerant in the condenser, this condition is referred to as low superheat low subcooling.

What happens when subcooling is too low?

Use Subcooling To Troubleshoot For example, a very low reading (between 0 degrees to 10 degrees subcooling) indicates that the refrigerant did not lose the normal amount of heat in its travel through the condenser.

What causes low superheat?

Some possible causes of low superheat are: •An overcharge of refrigerant can force excess refrigerant into the evaporator due to the higher pressure differential across the metering device. •The excess refrigerant does not absorb enough heat in the evaporator to completely vaporize, lowering the superheat.

What does low superheat mean?

Low Superheat. •Low superheat indicates an excess of liquid refrigerant in the evaporator coil for the heat load present. •This means either too much refrigerant is entering the coil or there is insufficient heat present to properly vaporize the refrigerant.

What is the normal range of superheat?

Superheat for most systems should be approximately 10F measured at the evaporator; 20F to 25F near the compressor. If the suction pressure is 45 psi, (which converts to 22F) and the suction temp is 32F, the system still has 10F of superheat.

What causes low subcooling?

Low Subcooling is an indication that not enough refrigerant is contained or “packed” in the condenser. This can be due to undercharge, poor compression, or a metering device oversized or failing open (overfeeding).