Honeywell Home RTHL3550 Programmable Thermostat Quick Installation Guide

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1 Honeywell Home RTHL3550 Programmable Thermostat

Honeywell Home RTHL3550 Programmable Thermostat

Installation is Easy

Label wires and remove your old thermostat
Install and wire your new thermostat
Set your new thermostat to match your heating/cooling system
It is preset for the most common system
We are here to help.
Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.

Turn Off Power to the Heating/Cooling System
Remove Old Thermostat
Remove old thermostat but leave the wallplate with wires attached.
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Contact the Thermostat Recycling Corporation at www.thermostat-recycle.org or 800-238-8192 for information on how and where to properly and safely dispose of your old thermostat.
Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
NOTE: Jumper wire used on old thermostat? If yes, note what letters the jumper connected and review in wiring section.
Separate Wallplate from New Thermostat
Mount Wallplate
Mount the new wallplate using the included screws and anchors.
Drill 3/32-in. holes for plaster.
Drill 3/16-in. holes for drywall.
Use a hammer to tap the anchors into the wall.
Connect Wires
Simply match wire labels.
Labels don’t match? See page 24.
Have a Heat Pump system? See pages 25-26.
We are here to help.
Call 1-800-468-1502 for wiring assistance.
Install Batteries
Install Thermostat onto Wallplate
Install the thermostat onto the wallplate on the wall.
Turn Power Back On
Turn the power back on to the heating/cooling system.
If your system type is
If your system type is:
- Single Stage Heat and Cool
  Congratulations, you’re done!
  If your system type is:
- Multistage Heat and Cool
- Heat Pump* without Backup Heat
- Heat Pump* with Backup Heat
- Heat Only
- Cool Only
  Continue with advanced installation on page 12 to match your thermostat to your system type.
  *Heat Pump—an air conditioner that provides cooling in the summer, and also runs in reverse in the winter to provide heating.
  If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502.
  This thermostat works on 24-volt or 750 mV systems. It will NOT work on multi-stage heat pump systems or 120/240 Volt systems.

Honeywell International Inc.
1985 Douglas Drive North Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive Toronto, Ontario M1V 4Z9
http://yourhome.honeywell.com