Honeywell RTH9590 User Manual page 19

Installing your thermostat
Alternate wiring key (Conventional System)
Do not use K terminal. For future use.
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• If you have both an R and Rc wire, unplug the jumper loop by pulling on the wire
2
loop.
• If your old thermostat had both R and RH wires, connect the R wire to the Rc
terminal, the RH wire to the R terminal, and unplug the jumper loop.
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