Source: http://www.achrnews.com/articles/84466-restricted-airflow-a-common-culprit "Low condensing (head) pressure: The restricted airflow over the evaporator coil will cause the refrigerant in the evaporator not to see a heat load, thus it will not be completely vaporized. With no heat load to be rejected in the condenser, the condensing pressure and temperature have to elevate to reject heat to the ambient. Low condensing pressures are the result."
So your evap coil is plugged. You don't absorb enough heat into the refrigerant so it's still cold going through the compressor. You will probably have a sweaty compressor and might also kill it. I get this.
What I do not get is the next part. I'm thinking you will have somewhat cool refrigerant flowing through the discharge line after the compressor. Why would the condensing pressure and temperature have to elevate to reject heat to the ambient in the condenser?
Using a R22 PT chart, http://www.advantageengineering.com/fyi/289/images/refrigerant%20temps%20w%20shading.jpg could somebody throw out some actual simulated figures between the suction line to condenser?
I don't think I understand what it's trying to say.
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