Orbit 83521 - Display Screen Overview

4 5
Heating system is on
Fan seing
Fan is activated
Room temperature
Reminder to
change baeries
Desired
temperature
seing
Schedule period
Current day of the week
Current time
Indicate which
mode the
system is in
Cooling system is on
This thermostat is compatible with
the following systems:
• Gas, oil or electric furnace
• Central air conditioner
• 2 wire hot water system with or without pump
• Millivolt system
• Central heating and cooling system
• Heat pump without auxiliary/backup heat
Tools Required For Installation
• Phillips screwdriver
• Wire cuers/strippers
• Drill with 3/16" (4.8 mm) drill bit
• Level
BEFOREYOUBEGINDISPLAYSCREEN
This thermostat is not compatible with
base board heaters (or other line voltage
heating), multi-stage heating or cooling
systems, or 3-wire hydronic systems.