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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 Non-programmable Electronic Thermostat Installation and User Guide 1. Introduction The RTH1120 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 •...
  • Page 2 Install the batteries as shown. Observe the polarity. Reinstall the battery cover. You will hear a clicking sound. Fan relay After the batteries are installed, the thermostat performs a series of tests for approximately 5 seconds. Afterwards, the screen displays the actual tempera- ture.
  • Page 3: Basic Functions

    (HEAT) or Cooling mode (COOL), or to turn the system off. 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.
  • 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: Instalación

    Termostato electrónico no programable Instalación y guía para el usuario 1. Introducción El termostato no programable RTH1120 puede usarse para controlar: • Un sistema de calefacción que funcione con gas, aceite combustible o electricidad de 2 ó 3 cables • Un acondicionador de aire central de 2 ó 3 cables •...
  • Page 6 Relé de la enfriamiento calefacción Nota: Quite el puente rojo ubicado entre las terminales Rc y Rh. RTH1120 2.4 Configuraciones del puente J2 El puente especifica como funcionará el venti- lador cuando se lo coloque en modo automático (vea la sección 3.2).
  • Page 7: Funciones Básicas

    Off ("Apagado"). De lo contrario, la unidad de calefacción y enfriamiento seguirá funcionando aunque se hayan extraído las bate- rías. RTH1120 4. Menú de configuración PANTALLA Cuando se muestre el parámetro de calefacción o de enfriamiento, use el interruptor de selección de modo del sistema...
  • Page 8: Asistencia Al Cliente

    6. Garantía Honeywell garantiza por un período de un (1) año, a partir de la fecha de compra por el consumidor, que este producto, sin incluir las baterías, no presentará defectos en los materiales ni en lo referente a la mano de obra, en condiciones normales de uso y de servicio.