Honeywell TH108PLUS Owners Manual
Owner’s
Guide
TH108PLUS
Non-programmable Thermostat
400-108-015-B 2009-11-30
Owner’s Guide 400-108-015-B |
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Table of contents |
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Overview |
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About your new thermostat ................................................................................... |
1 |
Controls and display.............................................................................................. |
2 |
Installation |
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Installation guidelines............................................................................................ |
3 |
Mounting the thermostat ....................................................................................... |
4 |
Wiring .................................................................................................................... |
5 |
Configuration switches .......................................................................................... |
6 |
Operation |
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Temperature display and setting ........................................................................... |
7 |
Setup menu........................................................................................................... |
8 |
Appendices |
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In case of difficulty................................................................................................. |
9 |
Specifications ...................................................................................................... |
10 |
3-year limited warranty......................................................................................... |
11 |
Customer assistance........................................................................................... |
12 |
TH108PLUS
About your new thermostat
This thermostat is designed to control an electric heating system such as a baseboard heater, a convector or a fan-forced heater.
The thermostat CANNOT be used with:
•a resistive load under 2 A
•a resistive load over 12.5 A
•a system driven by a contactor or a relay (inductive load)
•a central heating system
SUPPLIED PARTS
•One (1) thermostat
•Two (2) 6-32 mounting screws
•Two (2) solderless connectors
Do you need assistance?
We are here to help.
Call 1-800-831-2823.
1
Owner’s Guide 400-108-015-B
Controls and display
Appears when the setpoint is displayed
Heating intensity indicator (the image disappears when heating is off)
Backlit Screen
Up button
Down button
Temperature
Appears when the
thermostat is configured for a fan-forced heater 
(see page 6)
The settings are locked (see page 6)
2
TH108PLUS
Installation guidelines
TURN OFF POWER TO THE HEATING SYSTEM AT THE MAIN POWER PANEL TO AVOID ELECTRICAL SHOCK.
The installation must be performed by a qualified electrician and must comply with electrical codes of your region.
Do NOT install the thermostat in an area where it can be exposed to water or rain.
Avoid locations where there are air drafts (such as the top of a staircase or an air outlet), dead air spots (such as behind a door), or direct sunlight.
Do not install the thermostat on a wall section that conceals air ducts, chimney pipes or stove pipes.
Install the thermostat about 1.5 m (5 feet) high, on an inside wall facing the heater.
Install the thermostat onto an electrical box.
This thermostat has tinned copper wires for line and load connections. Special CO/ALR solderless connectors must be used if the thermostat will be connected to aluminium wires.
The thermostat wires are not polarized; either wire can be connected to the load or to the power supply.
Keep the air vents at the top and bottom of the thermostat clean and free from obstructions.
3
Owner’s Guide 400-108-015-B
Mounting the thermostat
nLoosen the screw underneath the thermostat and separate the faceplate from the wallplate.
NOTE: The screw remains captive and cannot be completely removed.
oWire the thermostat (see page 5).
pMount the wallplate to the electrical box using the provided screws. Insert the screws through the two left or right mounting holes of the wallplate.
qSet the configuration switches (see page 6)
rReinstall the faceplate onto the wallplate and tighten the screw.
NOTE: If there is a protective film or sticker on the thermostat’s screen, peel it off.
sApply power to the heating system. Verify the installation by checking that the heating system can be turned On by raising the setpoint using the Up button or turned Off by lowering the setpoint using the Down button.
4
TH108PLUS
Wiring
Connect the thermostat wires to the heating system (load) and to the power supply.
2-wire Installation |
4-wire Installation |
5
Owner’s Guide 400-108-015-B
Configuration switches
Configuration switches are on the back of the faceplate. Factory settings are inside gray cells.
# |
Parameter |
Up |
Down |
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|
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1 |
Settings lock 1 |
Lock |
Unlock |
2 |
Fan-forced heater 2 |
Fan Yes |
No |
3 |
Unit |
°F |
°C |
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1The thermostat buttons are disabled and 
appears on the screen (see page 2) when the settings are locked.
2Place at Fan Yes if you have a fan-forced heater (to prevent premature burnout of the motor). Leave at No for better temperature regulation if you do not have a fan-forced heater.
6
TH108PLUS
Temperature display and setting
The thermostat generally displays the room temperature.
•To display the set temperature (setpoint), press the Up or Down button once. The setpoint temperature will remain on the screen for 5 seconds.
•To change the setpoint temperature, press the Up or Down button repeatedly until the desired temperature is displayed.
•The screen is backlit for 10 seconds when any button is pressed.
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