1. Hydronic plants having an aggregate capacity of 201 horsepower or more. It shall be unlawful for any person to operate any hydronic plant having an aggregate capacity of 201 horsepower or more, unless such person possesses a first class engineer’s license. If the plant operates more than one shift, all other shifts may be staffed by persons who possess either first or second class stationary engineer’s licenses.

    2. Hydronic plants having an aggregate capacity of between 101 and 200 horsepower . It shall be unlawful for any person to operate any hydronic plant having an aggregate capacity of between 101 and 200 horsepower, unless such person possesses at least a second class stationary engineer’s license. If the plant operates more than one shift, all other shifts must also be staffed by persons who possess at least second class stationary engineer’s licenses.

    3. Hydronic plants having an aggregate capacity of between 51 and 100 horsepower . It shall be unlawful for any person to operate any hydronic plant having an aggregate capacity of between 51 and 100 horsepower, unless such person possesses at least a third class stationary engineer’s license. If the plant operates more than one shift, all other shifts must also be staffed by persons who possess at least third class stationary engineer’s licenses.

    Exception for temporary operation. If the owner has a maintenance contract with a licensed hydronic heating/cooling contractor in place, with a copy on file with inspection services division, then licensed stationary engineers are not required. The contract must state that the contractor will check the operation of the hydronic plant a minimum of once in every 24 hour period. Temporary operation is defined as a reasonable period of time which will permit the building owner or operator to hire an appropriately licensed stationary engineer.

    4. Ammonia refrigeration plants having an aggregate capacity of 10,000 pounds or more of refrigerant . It shall be unlawful for any person to operate any ammonia refrigeration plant having an aggregate capacity of 10,000 pounds or more of refrigerant unless such person possesses a refrigeration engineer’s license. If the plant operates more than one shift, all other shifts must also be staffed by holders of refrigeration engineer’s licenses.

    5. Ammonia refrigeration plants having an aggregate capacity of less than 10,000 pounds of refrigerant . It shall be unlawful for any owner to operate any ammonia refrigeration plant having an aggregate capacity of less than 10,000 pounds of refrigerant unless such person possesses a refrigeration engineer’s license. If the plant operates more than one shift, all other shifts must also be staffed by holders of refrigeration engineer’s licenses.

    Exception for temporary operation. If the owner has a maintenance contract with a licensed refrigeration contractor in place, with a copy on file with inspection services division, then licensed refrigeration engineers are not required. The contract must state that the contractor will check the operation of the ammonia refrigeration plant a minimum of once in every 24 hour period. Temporary operation is defined as a reasonable period of time which will permit the building owner or operator to hire an appropriately licensed refrigeration engineer.  (Ord. 2000-9646; 90/T-9327)