Rheem 953060DP Owner's Manual And Installation Instructions page 58

CONNECTIONS - ELECTRICAL
Electric Heating Unit – Wiring Diagram
If a single auxiliary boost element is supplied by Rheem, remove bridging wire at
the terminals marked 'A7 and A9' behind the element controller cover and
connect the terminal A7 and A9 to the voltage free terminal marked 'VF' in the
heat pump enclosure to control the operation of the boost element.
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