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606.1.3 Operator Logbook
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A logbook or other form of approved recordkeeping shall be maintained for all refrigerating systems whose operation requires either personal or general supervision by a certificate of qualification holder. For systems requiring personal supervision the logbook shall, at a minimum, contain an entry for each shift the system is in operation. For systems requiring general supervision the logbook shall, at a minimum, contain an entry for each day during which the system is in operation.
The logbook shall provide information relevant to the operation of the system, including any operating problems or deficiencies and required periodic tests. The signature of the certificate of qualification holder shall appear next to each entry.