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Honeywell RTH1120 Installation And User Manual

Non-programmable electronic thermostat
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Non-programmable Electronic Thermostat
1. Introduction
The RTH1120 non-programmable thermostat can be used to con-
• 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.
System operating
Fan operating
mode selector
mode selector
• 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
• Backlit display
• Battery replacement indicator
• Interchangeable faceplates (titanium, charcoal & taupe)
2. Installation
2.1 Removing the Old Thermostat
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).
Installation and User Guide
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-
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-
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 (using a 3/16"
drill bit) 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
Refer to the following table for matching the wire labels with the
thermostat terminals.
RTH1120 terminals
Heating power supply
Cooling power supply
Heating signal
Cooling signal
Note: Do not connect wires identified as C, X or B. Wrap the bare
end of these wires with electrical tape.
Important: The red jumper wire between Rh and Rc terminals must
be removed in a 5-wire installation.
Wire labels
Rh, R, 4, V
Rc, R
W, W1, H
Y, Y1, M
G, F



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  Summary of Contents for Honeywell RTH1120

  • Page 1 1. Introduction 2.2 Installing the New Baseplate For a new installation, choose a location approximately 5 feet The RTH1120 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 Secure the thermostat using the locking screw and install the Fan relay faceplate. Apply power back to the system. 2.3.6 5-wire Heating and Cooling Fan relay Heat relay Cool relay Note: Remove the red jumper wire between terminals Rc and Rh. RTH1120 69-1875EF-1 29/11/06...
  • Page 3: Basic Functions

    Dimensions: 5 in. x 3 in. x 1 in. (127 mm x 75 mm x 28 mm) Warning: Before removing the batteries, place the system switch on the thermostat to Off. Otherwise, the heating/cooling unit might still be running even after the batteries are removed. RTH1120 69-1875EF-1 29/11/06...
  • Page 4: Warranty

    55422, or whether a replacement product can be sent to you. This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the prod- uct was in the possession of a consumer.
  • Page 5: Installation

    1. Introduction ininflammable pour éviter tout courant d'air derrière le thermostat. Le thermostat non-programmable RTH1120 peut servir à comman- 2.2 Installer la base du thermostat der les appareils suivants : • système de chauffage au gaz, au mazout ou à l'électricité - 2 ou S'il s'agit d'une nouvelle installation, choisir un emplacement à...
  • Page 6 Visser le thermostat au moyen de la vis de fixation et installer la 2.3.6 Chauffage et climatisation, 5 fils plaque frontale. Rétablir l'alimentation électrique du système. Relais ventilateur Relais Relais climatisation chauffage Remarque : Enlever le cavalier (fil rouge) entre les bornes Rc et RTH1120 69-1875EF-1 29/11/06...
  • Page 7: Fonctions De Base

    Les réglages de température sont toutefois sauvegardés lorsque les piles sont enlevées. Avertissement : Avant d'enlever les piles, placer le sélecteur du système sur le thermostat à Off. Sinon, le système de chauffage/climatisation pourrait encore fonctionner même lorsque les piles sont enlevées. RTH1120 69-1875EF-1 29/11/06...
  • Page 8: Garantie

    La présente garantie ne s'appliquera pas s'il est démontré que la défectuosité ou le mauvais fonctionnement est dû à un endommagement du produit alors que le consommateur l'avait en sa possession. La responsabilité de Honeywell se limite à réparer ou à remplacer le produit conformément modalités susmentionnées.