Honeywell RTH7500D - Manual (Page 21)

21 69-1730
Step 7. Connect Wires to New Wallplate (Cont)
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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.
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3
NOTES FOR HEAT PUMP SYSTEMS
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69-1730.fm Page 21 Tuesday, July 13, 2004 12:45 PM