10 free CHFM practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
CHFM Practice Test 6Tutor mode
Question 1 of 10
Maintenance and Operations
Over three months, a water-cooled chiller's condenser approach temperature rose from 2°F to 7°F at similar loads. The refrigerant charge was verified, purge run time is unchanged, and the cooling tower water treatment contract lapsed during that period. What is the MOST likely cause?