Boyertown Furnace RSM 500 Installation, Operation And Maintenance Manual page 19

Heat Pump (1) Stage Heat (1) Stage Cool ECM Motor - Furnace Auxiliary Heat
O" Terminal on NRG Max terminal is to be energized on cooling. If thermostat "O/B"
terminal energizes for heating do not connect to NRG Max "O" terminal.
Humidistat breaks on high humidity. Jumper "R"-"DH" if not used.
Heat Pump (2) Stage Heat (2) Stage Cool ECM Motor - Furnace Auxiliary Heat
O" Terminal on NRG Max terminal is to be energized on cooling. If thermostat "O/B"
terminal energizes for heating do not connect to NRG Max "O" terminal
Humidistat breaks on high humidity. Jumper "R"-"DH" if not used.
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