Honeywell RTH5100 User manual

OPERATING INSTRUCTIONS
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved • Patents Pending 69-1722
Operating Instructions
RTH5100B
Non-programmable Thermostat
The RTH5100B Thermostat provides electronic control of 24 Vac single
stage heating and cooling systems or 750 mV heating systems.
For assistance with your Honeywell product please visit
www.honeywell.com/yourhome or call Honeywell Customer Care
toll free at 1-800-468-1502.
Read and Save these Instructions

69-1722 2
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
Accessory/Replacement Parts......................................15
Troubleshooting Tips ....................................................16
Customer Assistance....................................................21
Limited One-Year Warranty ..........................................22

3 69-1722
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.
Get To Know Your Thermostat

69-1722 4
Get To Know Your Thermostat
Thermostat
CoolOn
Setting
Cool
Inside
Fan
Auto Cool
System
DIGITAL DISPLAY
FAN BUTTON
SYSTEM BUTTON
TEMPERATURE
SETTING BUTTON
TEMPERATURE
SETTING BUTTON
BATTERY
HOLDER
BATTERY HOLDER LATCH
M22010
PRESS TO RELEASE
BATTERY HOLDER.
RAISES
TEMPERATURE
SETTING
TWO AAA
ALKALINE
BATTERIES
LOWERS
TEMPERATURE
SETTING
SELECTS HEAT, OFF OR COOL
SELECTS AUTO OR ON
PRESS

5 69-1722
Get to Know Your Thermostat (Cont)
Display
Replace Batt
H
eat
C
oo
l
On
On
S
ettin
g
CoolH
eat
In
s
i
de
F
an
O
n Aut
o
H
eat
Cool
Off
System
INSIDE
TEMPERAT
U
R
E
TEMPERATURE
SETTING
INDICATES
THERMOSTAT IS
"CALLING" FOR
HEAT OR COOL
CURRENT
SYSTEM SETTING
M22011
CURRENT
FAN SETTING
INDICATES BATTERIES ARE
L
O
W AND M
US
T BE REPLA
C
E
D

69-1722 6
Operate Your Thermostat
Set System Setting
Press the System button to select Heat, Off or Cool:
Heat—Thermostat controls the heating system.
Off—Both the heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
CAUTION
Equipment Damage Hazard.
Air conditioning compressor damage possible.
Do not operate cooling system when outdoor temperature
is below 50 °F (10 °C).
Cool
On
Se
rvi
ce
N
eeded
F
an
A
u
t
o
Coo
l
M22012
PRESS THE
SYSTEM BUTTON
TO SELECT HEAT,
OFF OR COOL

7 69-1722
Operate Your Thermostat (Cont)
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.
C
ool
On
Se
rvi
ce
N
eeded
F
an
A
u
t
o
C
oo
l
M22013
PRESS THE
FAN BUTTON
TO SELECT
A
UTO OR ON

69-1722 8
Operate Your Thermostat (Cont)
Change Temperature Setting
Press the Up or Down button to select the desired
temperature setting.
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.
Replace Batt
Se
rvi
ce
N
eeded
F
an
A
u
t
o
C
oo
l
System
PRESS THIS
BUTTON TO RAISE
THE TEMPERATURE
SETTING
TEMPERATURE
SETTING
M22014
TEMPERATURE SETTING RANGE:
HEAT: 40°TO 90°F (4.5°T0 32°C)
COOL: 50°TO 99°F (10° T0 37°C)
PRESS THIS
BUTTON TO LOWER
THE TEMPERATURE
SETTING

9 69-1722
Replace Batteries
1. When the Replace Battery indicator is flashing,
replace batteries promptly with two fresh
AAA alkaline batteries.
The thermostat does not lose any settings
when the batteries are replaced; all settings
are permanently stored in memory.
Re
p
lace Bat
t
S
ervice Neede
d
F
an
A
u
t
o
Cool
System
REPLACE BATTERY INDICATOR
M22015

69-1722 10
Replace Batteries (Cont)
2. Press the battery holder latch to release the battery
holder.
3. Remove the battery holder from the thermostat.
S
ervice Neede
d
F
an
A
u
t
o
Cool
BATTERY HOLDER
LATCH
BATTERY HOLDER
M22016

11 69-1722
Replace Batteries (Cont)
4. Remove the old batteries and insert two fresh
AAA alkaline batteries as marked on the battery
holder.
M22017
BATTERY
HOLDER
PUSH
BATTERIES
OUT
THROUGH
THIS HOLE
BATTERY
DIRECTION

69-1722 12
Replace Batteries (Cont)
5. Insert battery holder as shown.
S
ervice Neede
d
F
an
A
u
t
o
Cool
BATTERY HOLDER
LATCH
BATTERY HOLDER
M22016

13 69-1722
Review Battery Tips
1. Replace the batteries as soon as Replace Batt
flashes in the display. The Replace Battery
indicator flashes in the display two months before
the batteries run down completely.
2. Always use fresh AAA alkaline batteries.
Non-alkaline batteries do not last as long and can
leak, causing thermostat damage.
3. Although the thermostat has a Replace Battery
indicator, replace the batteries once a year to
prevent the thermostat and heating/cooling system
from shutting down due to lack of battery power.
NOTE: Replacing the batteries once a year also helps
prevent battery leakage that can damage the
thermostat.
4. As a precaution, replace the batteries when leaving
your home for more than a month to prevent your
heating/cooling system from shutting down if the
batteries run down completely.

69-1722 14
Built-in Compressor Protection
The RTH5100B Thermostat has built-in compressor
protection (minimum-off timer) that prevents the
compressor from restarting too early after a shutdown.
The minimum-off timer is activated after the compressor
turns off.
If there is a call during the minimum-off timer, the
thermostat flashes “Cool On” or “Heat On”ain the display.
When the minimum-off timer expires, “Cool On” or “Heat
On”aappears solidly in the display and the compressor
and fan turn on.
________
a Heat Pumps only.

15 69-1722
Accessory/Replacement Parts
1. Cover Plates—Used to cover marks on the wall
Part Number:
50001137-001 (Small) Cover Plate
50002883-001 (Large) Cover Plate
To order, call Honeywell Customer Care at
1-800-468-1502.
2. Replacement Battery Holder—
Part Number 50000951-001 Battery Holder
To order, call Honeywell Customer Care at
1-800-468-1502.
M22185
M22018

69-1722 16
Troubleshooting Tips
If . . . Then . . .
Display is
blank.
Check that fresh AAA alkaline batteries
are installed as marked on the battery
holder.
Temperature
settings do
not change.
Check that the temperature settings are:
•Heating 40°F to 90°F(4.5°C to 32°C).
•Cooling 50°F to 99°F (10°C to 37°C).
Heating
system does
not turn on.
•Set the system to Heat by pressing
the System button.
•Check the heat temperature setting to
be sure it is set above the room
temperature and “Heat On” shows
solidly in the display.
•Check the circuit breaker to be sure it
is not tripped.
•Check power switch at heating and/or
cooling system to be sure it is on.
•Check the furnace door to be sure it is
closed securely.
•Wait five minutes for the heating
system to respond.
•If all of this was checked, contact your
local heating and cooling contractor.

17 69-1722
Cooling
system does
not turn on.
•Set the system to Cool by pressing
the System button.
•Check the cool temperature setting to
be sure it is set below the room
temperature and “Cool On” shows
solidly in the display.
•Check the circuit breaker to be sure it
is not tripped.
•Check the power switch at the heating
and/or cooling system to be sure it is
on.
•Check the furnace door to be sure it is
closed securely.
•Wait five minutes for the cooling
system to respond.
•If all of this was checked, contact your
local heating and cooling contractor.
Cannot set
System
setting to
Cool.
Check Installer Setup Number 1, Heating
and/or Cooling System Type; make sure
the setting matches the installed heating
and/or cooling system. Refer to
Installation Instructions, 69-1716.
Troubleshooting Tips (Cont)
If . . . Then . . .

69-1722 18
“Heat On” is
not shown in
the display.
Set the System setting to Heat and set
the temperature setting above the room
temperature. If “Heat On” is shown
solidly in the display, but the heating
system does not turn on, see “Heating
system does not turn on” in
theTroubleshooting Tips.
“Cool On” is
not shown in
the display.
Set the System setting to Cool and set
the temperature setting below the room
temperature. If “Cool On” is shown solidly
in the display, but the cooling system
does not turn on, see “Cooling system
does not turn on” in the Troubleshooting
Tips.
“Heat On” is
flashing in the
display (heat
pumps only).
Compressor minimum-off timer is active.
Wait up to five minutes for the heating
system to turn on.
“Cool On” is
flashing in the
display.
Compressor minimum-off timer is active.
Wait up to five minutes for the cooling
system to turn on.
Troubleshooting Tips (Cont)
If . . . Then . . .

19 69-1722
Fan does not
turn on in a
call for heat
(electric
furnaces
only).
Check Installer Setup Number 3, Fan
Control in Heating, and make sure it is
set to Electric Heat (Setting 1).Refer to
Installation Instructions, 69-1716
Heat pump
puts out cool
air in the heat
mode and
warm air in
the cool
mode (heat
pumps only).
Check Installer Setup Number 2, Heat
Pump Changeover Valve, and make sure
the setting matches the changeover
required by the installed heat pump.
Refer to Installation Instructions,
69-1716.
Both the
heating and
cooling
systems are
running at the
same time.
Check Installer Setup Number 1, Heating
and/or Cooling System Type, and make
sure the setting matches the installed
heating and/or cooling system. Refer to
Installation Instructions, 69-1716.
Check and make sure the bare portions
of the wires are not touching.
Troubleshooting Tips (Cont)
If . . . Then . . .

69-1722 20
Heating
system is
running in
cool mode.
Check Installer Setup Number 1, Heating
and/or Cooling System Type, and make
sure the setting matches the installed
heating and/or cooling system. Refer to
Installation Instructions, 69-1716.
Heating
system does
not turn off
and the heat
temperature
setting is set
below the
room
temperature
(“Heat On” is
not shown in
the display).
Check Installer Setup Number 1, Heating
and/or Cooling System Type, and make
sure the setting matches the installed
heating and/or cooling system. Refer to
Installation Instructions, 69-1716.
Troubleshooting Tips (Cont)
If . . . Then . . .