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Non-programmable Electronic Thermostat
1. Introduction
The RTH110B non-programmable thermostat can be used to con-
trol:
• a gas, fuel oil or electric furnace - 2 or 3 wires
• a central air conditioner - 2 or 3 wires
• a hot water system with or without pump - 2 wires
• a millivolt system - 2 wires
• a central heating and cooling system - 4 or 5 wires
Note: This thermostat is not compatible with heat pumps or multi-
stage systems.
Display
System operating
Fan operating
mode selector
mode selector
Features
• System operating mode selection: heat, cool or off
• Fan operating mode selection: automatic or on (continuous)
• Programmable heating and cooling cycle lengths: 10, 12, 15, 20
or 30 minutes
• Temperature display in °F or °C
• Battery replacement indicator
2. Installation
2.1 Removing the Old Thermostat
IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT
POWER TO THE HEATING SYSTEM.
Remove the old thermostat to access the wires.
Attention: If the old thermostat was mounted onto an electrical box,
it was probably powered by 120/240 volts. In this case, this thermo-
stat cannot be used.
Identify and label each wire (with the corresponding letter on
the wire terminal) and remove them from the terminals.
If necessary, strip the end of each wire (maximum of 1/4 inch).
RTH110B
RTH110B
Installation and User Guide
Adjustment
buttons
Wrap the wires around a pencil to prevent
them from falling into the wall.
If the hole in the wall is too big, insulate it
using a non-flammable material in order
to avoid air draughts behind the thermo-
stat.
2.2 Installing the New Baseplate
For a new installation, choose a location approximately 5 feet
(1.5 m) above the floor and on an inside wall. Avoid draughty
areas (top of staircase, air outlet, etc.), dead air spots (behind
doors), direct sunlight or areas near concealed pipes or chim-
neys.
Remove the thermostat faceplate.
Loosen the locking screw to separate the thermostat from its
baseplate (the screw cannot be completely removed).
Tilt the thermostat upwards.
Mark and bore the appropriate mounting holes (or use the
existing holes). Insert the plastic anchors.
Pass the wires through the opening of the baseplate and fix the
baseplate to the wall using the screws provided.
2.3 Connecting the Thermostat
The connection of the new thermostat should be similar to that of
the old thermostat; however, it can vary depending on the installa-
tion.
Rh
Heating power supply
Rc
Cooling power supply
W
Heating signal
Y
Cooling signal
G
Fan
Note: The red jumper wire between the Rc and Rh terminals must
be removed in 2- or 5-wire installations. The jumper must be used in
3- or 4-wire installations if you wish to use the mode selector switch
for the fan.
69-1799
2/6/05
1/3
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Summary of Contents for Honeywell RTH110B
- Page 1 1. Introduction 2.2 Installing the New Baseplate For a new installation, choose a location approximately 5 feet The RTH110B non-programmable thermostat can be used to con- (1.5 m) above the floor and on an inside wall. Avoid draughty trol: areas (top of staircase, air outlet, etc.), dead air spots (behind •...
- Page 2 Note: When you place the thermostat in Cooling mode, you might need to wait up to five minutes before cooling can start. This is a safety feature for the compressor. will flash on the screen until cooling can start again. Heat relay Cool relay RTH110B 69-1799 2/6/05...
- Page 3 This warranty does not cover removal or reinstallation costs. This war- ture settings are saved and do not need to be re-entered. ranty shall not apply if it is shown by Honeywell that the defect or mal- function was caused by damage which occurred while the product was Warning: Before removing the batteries, place the in the possession of a consumer.