Honeywell RTH111 Series Quick Installation Manual page 13

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If your system type is...
If your system type is:
q Single Stage Heat and Cool
q Heat Only or Cool Only
Congratulations, you're done!
If you are not sure of your system type or if you have
other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems. It will
NOT work on multi-stage heat pump, multi-stage conven-
tional system or 120/240 Volt systems.
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