Honeywell RTHL3550D Owner's Manual
Quick Installation Guide
69-2697ES-03
RTHL3550
Non-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.
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Turn Off Power to Heating/
1
Cooling System
M28097
1 69-2697ES—03
Remove Old Thermostat
2
Remove old thermostat but leave wallplate with
wires attached.
Is there a sealed tube containing
Leave wallplate in
place
Old thermostat
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 800238-8192 for information on how and where to
properly and safely dispose of your old thermostat.
mercury? If so, see notice below
for proper disposal instructions.
Cover
M28099
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Label Wires with Tags
3
Label the wires using the supplied wire labels as you
disconnect them.
Wire Labels
M28093
NOTE: Jumper wire used on old thermostat? If yes, note
what letters the jumper connected and review in wiring
section.
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M28100
Separate Wallplate from
4
New Thermostat
Remove battery holder.
Pull here to remove wallplate from new
thermostat.
Wallplate
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M28343
Mount Wallplate
5
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 hammer to tap the anchors into the wall.
M28345
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Connect Wires
6
Simply match wire labels.
W
Remove metal
jumper if you have
both R and Rc wires.
W2 GGW
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.
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YYRRRcY2
MCR31270A
CONVENTIONAL
Install Batteries
7
Install two AA alkaline batteries.
Back of thermostat
M28346
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Install Thermostat onto Wallplate
8
Install thermostat onto the wallplate on the wall.
MCR32613
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Turn Power Back On
9
Turn the power back on to the heating/cooling system.
M28098
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10
If your system type is...
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.
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Advanced Installation
System setup .......................................................................12
Wiring ..................................................................................22
Troubleshooting ...................................................................25
Customer assistance ...........................................................27
Limited warranty ..................................................................28
Advanced Installation Guide
System setup
Press and hold the s and FAN buttons until the screen
changes (approximately 5 seconds).
SETUPWIRINGASSISTANCETROUBLESHOOTING
MCR33377
Press s or t to change settings.
SettingFunction
Done Next
Press DONE to exit
and save settings.
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MCR32600
Press NEXT to advance
to next function.
Function 1: System type
Press the s or t button to select the type
of system you have in your home:
RTHL3550
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Done Next
0 Heating & cooling: Gas, oil or electric heating with
MCR32599
central air conditioning.
1 Heat pump: Outside compressor provides both heating
and cooling without backup or auxiliary heat.
2 Heating only: Gas, oil or electric heating without
central air conditioning.
3 Heating 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.)
4 Cool only: Central air conditioning only.
5 Heat Pump: Outside compressor provides both heating
and cooling with backup or auxiliary heating.
6 Heat/Cool Multiple Stages: Two heat stages (wires on W
and W2), two cooling stages (wires on Y and Y2).
7 Heat/Cool Multiple Stages: Two heat stages (wires on
W and W2), one cooling stage (wire on Y).
8 Heat/Cool Multiple Stages: One heat stage (wire on
W), two cooling stages (wires on Y and Y2).
Press to change setting. When correct setting is selected, press NEXT
to display next function.
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MCR32602
Advanced Installation Guide
About your new thermostat
Function 2: Heat pump changeover valve
Press the s or t button to select whether your changeover valve is used in heating or cooling:
NOTE: If Function 2 does not appear, please turn to the
next page to continue.
SETUPWIRINGASSISTANCETROUBLESHOOTING
Done Next
MCR32605
0 Cooling changeover valve: Use this setting if you
connected a wire labeled “O” to the O/B wire terminal
(see page 23).
1 Heating 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
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RTHL3550
About your new thermostat
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.
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Done Next
MCR32603
0 Gas or oil heat: Use this setting if you have a gas or
oil heating system (system controls fan operation).
1 Electric 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
15 69-2697ES—03
Advanced Installation Guide
About your new thermostat
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.
SETUPWIRINGASSISTANCETROUBLESHOOTING
Done Next
MCR32604
5 Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
9 Electric furnace: Use this setting if you have any type
of electric heating system.
3 Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas furnace
of greater than 90% efficiency.
1 Gas/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
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RTHL3550
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.
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Done Next
MCR32606
5 Gas or oil furnace: Use this setting if you have a
standard gas or oil furnace that is less than 90%
efficient.
9 Electric furnace: Use this setting if you have any type
of electric heating system.
3 Hot water or high-efficiency furnace: Use this
setting if you have a hot water system or a gas furnace
of greater than 90% efficiency.
1 Gas/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
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Advanced Installation Guide
Function 12: Manual/Auto Changeover
Press the s or t button to select Manual or Auto
Changeover:
SETUPWIRINGASSISTANCETROUBLESHOOTING
Done Next
MCR32609
0 Manual Changeover: (Heat/Off/Cool)
1 Automatic Changeover: (Heat/Off/Cool/Auto)
Automatically turns on heat or cool based on room
temperatures.
CAUTION: To avoid possible compressor damage,
set to option 0 if the outside temperature drops
below 50 ºF (10 ºC).
NOTE: System maintains a minimum 3 ºF difference
between heat and cool settings.
Press to change setting.
When correct setting is
selected, press NEXT to
display next function.
MCR32602
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