Honeywell RTH8500 Installation Manual page 22

Installation Guide
System setup About your new thermostat
Heating cycle rate
Function
Press
0240
Options: 5
9
3
1
Emergency heat cycle rate (heat pumps only)
Function
Press
0270
Options: 9
5
3
1
to select your heating system:
s/t
Gas or oil furnace: Use this setting if you have a standard gas or oil furnace
that is less than 90% efficient.
Electric furnace: Use this setting if you have an electric heating system.
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.
Gas/oil steam or gravity system: Use this setting if you have a steam or
gravity heat system.
to select your heating system:
s/t
Electric furnace: Electric heating systems.
Gas or oil furnace: Standard gas/oil furnace (less than 90% efficiency).
Hot water or high-efficiency furnace: Hot water system or gas furnace
(more than 90% efficiency).
Gas/oil steam or gravity system: Steam or gravity heat systems.
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