Honeywell RTH221B Instruction Manual download pdf (Page 17)

RTH2300/RTH221

15 69-2728ES—02

About your new thermostat

SETUP WIRING ASSISTANCE TROUBLESHOOTING

M32720

System setup

Press the s or t button to select your heating system

and optimize its operation.

Function 5: Heating cycle rate

5 Gas or oil furnace: Use this setting if you have a

standard gas or oil furnace that is less than 90%

efficient.

6 Electric furnace: Use this setting if you have any type

of electric heating system.

3 Hot water or high-efficiency furnace: Use this

setting if you have a hot water system or a gas furnace

of greater than 90% efficiency.

2 Gas/oil steam or gravity system: Use this setting if

you have a steam or gravity heat system.

Press to

change

setting.

When finished,

press s and t

to advance to the

next function.

M33591

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Honeywell RTH221B Instruction Manual Page 17