What happens to the suction pressure when condenser air flow is poor?

When there is poor air flow across the condenser, it leads to inadequate heat exchange, which ultimately affects the refrigerant's ability to condense efficiently. As the condenser's efficiency drops, the refrigerant is unable to release its heat properly, causing an increase in pressure within the condenser unit.

This increased pressure in the condenser directly impacts the suction side of the system. Since the suction line is connected to the evaporator, a higher pressure in the condenser can create back pressure, effectively causing the suction pressure to rise. The rise in suction pressure indicates that the refrigerant is less able to evaporate in the evaporator, leading to decreased cooling efficiency and potential system issues.

Therefore, the correct choice is that the suction pressure increases when condenser air flow is poor.