Residential HVAC Installation Practice Exam

The maximum recommended pressure for leak testing on the low-pressure side of a system is 150 psig because this pressure level ensures thorough testing without causing any damage to the system or its components. Option A of 50 psig may not provide enough pressure to accurately detect small leaks, while options B and D of 100 psig and 200 psig, respectively, may put too much stress on the system and potentially cause damage. Therefore, the most appropriate and safest option is C of 150 psig.