This is a condenser with a customer-invented "keep dirt out" device.
This is the supply air for the 4-ton system.
This is the Return air for the 4-ton system.
... so since there is no airflow and the unit freezes up and doesn't cool the house (but keeps running) the customer is adding extra BTU capacity.
This extra BTU capacity helps for the 4-ton system which the customer told me was "too small" to cool the 1000 sq ft home.