Honeywell RTHL3550 User manual

RTHL3550
Non-programmable Thermostat
Quick Installation Guide
69-2697ES-03

69-2697ES—03 ii
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.

1 69-2697ES—03
1Turn Off Power to Heating/
Cooling System
M28097

69-2697ES—03 2
Remove old thermostat but leave wallplate with
wires attached.
2Remove Old Thermostat
M28099
Is there a sealed tube containing
mercury? If so, see notice below
for proper disposal instructions.
Leave wallplate in
place
Old thermostat
Cover
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.

3 69-2697ES—03
3Label Wires with Tags
Label the wires using the supplied wire labels as you
disconnect them.
M28100
Wire Labels
M28093
NOTE: Jumper wire used on old thermostat? If yes, note
what letters the jumper connected and review in wiring
section.

69-2697ES—03 4
M28343
4Separate Wallplate from
New Thermostat
Wallplate
Pull here to remove wallplate from new
thermostat.
Remove battery holder.

5 69-2697ES—03
Mount the new wallplate using the included screws
and anchors.
5Mount Wallplate
M28345
Drill 3/32-in. holes for plaster.
Drill 3/16-in. holes for drywall.
Use hammer to tap the anchors into the wall.

69-2697ES—03 6
Simply match wire labels.
MCR31270A
W2 G
G
W
W
Y
Y
R
R
RcY2
6Connect Wires
Labels don’t match? See page 22.
Have a Heat Pump system? See pages 23-24.
We are here to help.
Call 1-800-468-1502 for wiring assistance.
Remove metal
jumper if you have
both Rand Rc wires.
CONVENTIONAL

7 69-2697ES—03
Install two AA alkaline batteries.
M28346
Back of thermostat
7Install Batteries

69-2697ES—03 8
Install thermostat onto the wallplate on the wall.
8Install Thermostat onto Wallplate
MCR32613