Honeywell RTH221B1021 Quick Installation Guide

Advanced Installation Guide
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WIRINGASSISTANCETROUBLESHOOTING
When correct setting is selected, press both s and t
to display next function.
Heating cycles per hour
Note: Make sure system switch is in the heat position.
Press the s or t button to select your heating
system and optimize its operation:
5 12 min, Gas or oil furnace. Use this setting if you
have a standard gas or oil furnace that is less than
90% efficient.
2 30 min, Steam or gravity system. Use this setting if
you have a steam or gravity heat system.
3 20 min, Hot water or high-efficiency furnace: Use
this setting if you have a hot water system or a gas fur-
nace of greater than 90% efficiency.
4 15 min, Gas or oil furnace. Use this setting if you
have a standard gas or oil furnace that is less than
90% efficient.
6 10 min, Electric furnace: Use this setting if you have
any type of electric heating system.
3
5
2 to 6 cycles per hour

Honeywell RTH221B1021 Specifications

General

Type	Non-programmable
Display	Digital
Power Source	Battery
Temperature Control Range	40°F to 90°F (4°C to 32°C)
Stages	1 Heat/1 Cool
Voltage	24V
Backlight	No
Compatibility	Single-stage heating and cooling systems