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

9 69-2697ES—03
Turn the power back on to the heating/cooling system.
9Turn Power Back On
M28098

69-2697ES—03 10
If your system type is:
q Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
q Multistage Heat and Cool
q Heat Pump* without Backup Heat
q Heat Pump* with Backup Heat
q Heat Only
q Cool Only
Continue with advanced installation
on page 11 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 120/240 Volt systems.
10 If your system type is...

Advanced Installation
System setup.......................................................................12
Wiring ..................................................................................22
Troubleshooting ...................................................................25
Customer assistance...........................................................27
Limited warranty ..................................................................28

Advanced Installation Guide
69-2697ES—03 12
SETUPWIRINGASSISTANCETROUBLESHOOTING
MCR32600
Done Next
MCR33377
Press and hold the sand FAN buttons until the screen
changes (approximately 5 seconds).
System setup
SettingFunction
Press s or tto change settings.
Press NEXT to advance
to next function.
Press DONE to exit
and save settings.

RTHL3550
13 69-2697ES—03
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Function 1: System type
Press the s or t button to select the type
of system you have in your home:
0Heating & cooling: Gas, oil or electric heating with
central air conditioning.
1Heat pump: Outside compressor provides both heating
and cooling without backup or auxiliary heat.
2Heating only: Gas, oil or electric heating without
central air conditioning.
3Heating only with fan: Gas, oil or electric heating
without central air conditioning. (Use this setting if you
could turn the fan on and off with a fan switch on your
old thermostat.)
4Cool only: Central air conditioning only.
5Heat Pump: Outside compressor provides both heating
and cooling with backup or auxiliary heating.
6Heat/Cool Multiple Stages: Two heat stages (wires on W
and W2), two cooling stages (wires on Y and Y2).
7Heat/Cool Multiple Stages: Two heat stages (wires on
W and W2), one cooling stage (wire on Y).
8Heat/Cool Multiple Stages: One heat stage (wire on
W), two cooling stages (wires on Y and Y2).
Press to change setting. When cor-
rect setting is selected, press NEXT
to display next function.
MCR32599
Done Next
MCR32602

Advanced Installation Guide
69-2697ES—03 14
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
MCR32605
Done Next
Function 2: Heat pump changeover valve
Press the s or t button to select whether your change-
over valve is used in heating or cooling:
NOTE: If Function 2 does not appear, please turn to the
next page to continue.
0Cooling changeover valve: Use this setting if you
connected a wire labeled “O” to the O/B wire terminal
(see page 23).
1Heating changeover valve: Use this setting if you
connected a wire labeled “B” to the O/B wire terminal
(see page 23).
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602

RTHL3550
15 69-2697ES—03
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
MCR32603
Done Next
Function 3: Heating fan control
Press the s or t button to select your heating system
and fan operation:
NOTE: If Function 3 does not appear, please turn to the
next page to continue.
0Gas or oil heat: Use this setting if you have a gas or
oil heating system (system controls fan operation).
1Electric heat: Use this setting if you have an electric
heating system (thermostat controls fan operation).
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602

Advanced Installation Guide
69-2697ES—03 16
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
MCR32604
Done Next
Function 5: Heating cycle rate
Press the s or t button to select your heating system
and optimize its operation:
NOTE: If Function 5 does not appear, please turn to the
next page to continue.
5Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
9Electric furnace: Use this setting if you have any type
of electric heating system.
3Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas furnace
of greater than 90% efficiency.
1Gas/oil steam or gravity system: Use this setting if
you have a steam or gravity heat system.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602

RTHL3550
17 69-2697ES—03
SETUP WIRING ASSISTANCE TROUBLESHOOTING
MCR32606
Done Next
Function 6: Stage 2 Heat cycle rate
Press the s or t button to select your heating system
and optimize its operation:
NOTE: If Function 6 does not appear, please turn to the
next page to continue.
5Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
9Electric furnace: Use this setting if you have any type
of electric heating system.
3Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas furnace
of greater than 90% efficiency.
1Gas/oil steam or gravity system: Use this setting if
you have a steam or gravity heat system.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602

Advanced Installation Guide
69-2697ES—03 18
SETUPWIRINGASSISTANCETROUBLESHOOTING
MCR32609
Done Next
Function 12: Manual/Auto Changeover
Press the s or t button to select Manual or Auto
Changeover:
NOTE: System maintains a minimum 3 ºF difference
between heat and cool settings.
CAUTION: To avoid possible compressor damage,
set to option 0 if the outside temperature drops
below 50 ºF (10 ºC).
0Manual Changeover: (Heat/Off/Cool)
1Automatic Changeover: (Heat/Off/Cool/Auto)
Automatically turns on heat or cool based on room
temperatures.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602