Operating Instructions
TH5110D
Non-programmable Thermostat
OPERATING INSTRUCTIONS
The TH5110D Thermostat provides electronic control of 24 Vac singlestage heating and cooling systems or 750 mV heating systems.
For assistance with your Honeywell product please visit
www.honeywell.com/yourhome
toll free at 1-800-468-1502.
or call Honeywell Customer Care
Read and Save these Instructions
Patents Pending
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved
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Contents
Features........................................................................3
Get to Know Your Thermostat ......................................4
Thermostat...............................................................4
Display .....................................................................5
Operate Your Thermostat .............................................6
Set System Setting ..................................................6
Set Fan Setting ........................................................7
Change Temperature Setting...................................8
Replace Batteries .........................................................9
Review Battery Tips......................................................13
Built-in Compressor Protection .....................................14
Auto Changeover..........................................................15
Replacement Part.........................................................19
Troubleshooting Tips ....................................................20
Customer Assistance....................................................23
Limited Five-Year Warranty ..........................................24
2 69-1713
Features
• Large, Clear, Backlit Display: Easy-to-see and
read—even in the dark.
• Precise Comfort Control: ±1ºF of your set
temperature.
• Simplified Operation: Soft-key controls.
Simultaneously displays both room temperature
and temperature setting.
• Easy Change Battery Holder.
• Built-in Compressor Protection: Minimum-off
timer protects compressor from restarting too
early after a shutdown.
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Thermostat
Get to Know Your Thermostat
DIGITAL DISPLAY
Inside
Fan
Auto
FAN BUTTON
SELECTS AUTO OR ON
BATTERY HOLDER LATCH
PRESS TO RELEASE
BATTERY HOLDER
PRESS
Cool
Setting
Cool
System
On
Cool
SYSTEM BUTTON
SELECTS HEAT, OFF, COOL OR AUTO
4 69-1713
BATTERY
HOLDER
TWO AAA
ALKALINE
BATTERIES
TEMPERATURE
SETTING BUTTON
RAISES
TEMPERATURE
SETTING
TEMPERATURE
SETTING BUTTON
LOWERS
TEMPERATURE
SETTING
M22084
Get to Know Your Thermostat (Cont)
Replace Battery
eat
Cool
de
S
g
eat
Sy
m
an
O
o
E
LO
D
Display
INSIDE
TEMPERATUR
Insi
F
n Aut
CURRENT
FAN SETTING
69-1713 5
INDICATES BATTERIES ARE
W AND MUST BE REPLACE
CoolHeat
ettin
On
H
On
ste
H
Cool
AutoOff
CURRENT
SYSTEM SETTING
TEMPERATURE
SETTING
INDICATES
THERMOSTAT IS
"CALLING" FOR
HEAT OR COOL
M22083
Operate Your Thermostat
Replace Batt
Se
eeded
an
o
Cool
System
Set System Setting
Press the System button to select Heat, Off, Cool or Auto:
Heat—Thermostat controls the heating system.
Off—Both the heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
Auto—Thermostat automatically changes between
heating and cooling operation, depending on indoor
temperature. See Auto Changeover section.
CAUTION
Equipment Damage Hazard.
Air conditioning compressor damage possible.
Do not operate cooling system when outdoor temperature is
°
below 50
F (10°C).
F
PRESS THE
SYSTEM BUTTON
TO SELECT HEAT,
OFF, COOL OR AUTO.
rvice N
Aut
M22107
6 69-1713
Operate Your Thermostat (Cont)
Replace Batt
Cool
On
Se
eeded
S
g
Cool
de
an
o
Cool
System
Set Fan Setting
Press the Fan button to select Auto or On:
Auto—Normal setting for most homes. The fan runs
only when the heating or cooling system is on.
On—The fan runs continuously. Use this setting for
improved air circulation or for more efficient air
cleaning.
Insi
PRESS THE
FAN BUTTON
TO SELECT
AUTO OR ON.
69-1713 7
ettin
rvice N
F
Aut
M22108
Operate Your Thermostat (Cont)
Replace Batt
Cool
On
Se
eeded
de
an
o
Cool
System
Change Temperature Setting
Press the Up or Down button to select the desired
temperature setting.
TEMPERATURE SETTING
Insi
rvice N
F
Aut
TEMPERATURE SETTING RANGE:
HEAT: 40°TO 90°F (4.5°T0 32°C)
COOL: 50°TO 99°F (10°T0 37°C)
The first press of the Up or Down button turns on
the backlight. The second press of the Up or Down
button changes the temperature setting.
PRESS THIS BUTTON TO
RAISE THE TEMPERATURE
SETTING
PRESS THIS BUTTON TO
LOWER THE
TEMPERATURE
SETTING
M22109
8 69-1713
Replace Batteries
Replace Battery
Service Needed
de
g
Cool
Cool
Sy
an
o
AA alkaline batteries.
1. When the Replace Battery indicator is flashing,
replace batteries promptly with two fresh
AAA alkaline batteries.
REPLACE BATTERY INDICATOR
Insi
The thermostat does not lose any settings when the
batteries are replaced; all settings are permanently
stored in memory.
69-1713 9
Aut
Settin
stemF
M22110
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