Honeywell RTH8500D Use and Care Manual download pdf (Page 20)

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Step 7. Connect Wires to New Wallplate (Cont)

M22245

Leave metal jumper wire between RC and R in place.

If the old thermostat had separate wires on both the V and VR,

some system modification is required. Call your local heating

and cooling contractor for assistance.

If the old thermostat had wires on both O and B, be sure to

attach the B wire to the C letter designation on the new

thermostat. If another wire is already matched to the C, contact

Honeywell.

If the old thermostat had wires on W1, Y1 and W2, some

system modification is required. Call your local heating and

cooling contractor for assistance.

NOTES FOR HEAT PUMP SYSTEMS

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Honeywell RTH8500D Use and Care Manual Page 20