Honeywell RTH2300/RTH221 Installation Guide

About Honeywell RTH2300/RTH221 Installation Guide

This thermostat cannot be used on heat pumps with auxiliary/backup heat or on multistage systems.

  • Turn Off Power to Heating/Cooling System
  • Remove Old Thermostat
  • Identify Wires If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Wrap the bare metal end of each of these wires with electrical tape, so it cannot touch and short other wires.
  • Mount New Wallplate
    • Loosen the locking screw at the bottom of the thermostat. Note that the screw is captive and cannot be removed from the wallplate.
    • Separate the thermostat from the wallplate as per Figure 1.
    • Position the wallplate against the wall and mark hole positions with a pencil.
      NOTE: Levelling is for esthetics only and will not affect the performance of the thermostat.
    • Drill holes at the marked positions and insert supplied wall anchors.
    • Pass the wires through the large opening located at the bottom center of the wallplate as per Figure 2.
      Secure the wallplate to the wall with supplied mounting 6. screws as per Figure 3.
    • Connect the wires to the terminals.

Honeywell RTH2300/RTH221 Installation Guide Table of Content

Advanced Installation
System setup.....................................................................11
Temperature display............................................................12
Time display format.............................................................13
Heating cycles per hour.......................................................14
Compressor protection........................................................15
Customer assistance..........................................................16
Limited warranty.................................................................17

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Honeywell RTH2300/RTH221 Installation Guide