Specifications

ManualsBrandsHoneywell ManualsDomestic AppliancesDT90

EN0H 8578 UK07 R1 12/08

DT90

DIGITAL ROOM THERMOSTAT

PRODUCT SPECIFICATION SHEET

The new DT90 family of digital room thermostats is a

range of market leading products designed to provide

comfort with economy in modern heating systems.

Its large display and simple button interface make DT90

extremely easy to use.

Energy efficiency is addressed by state-of-the-art TPI

control performance and an ECO button energy saving

feature.

Applications include control of gas or oil-fired boiler

systems, underfloor heating, electric heating and zoning

systems.

With a modern fresh look that complements any style of

décor, and a range of valued features for users and

installers alike, DT90 sets the standard for simple

environmentally-friendly room thermostats.

FEATURES

 Energy saving TPI control performance

 Advanced self-learning control adapts to the

environment and ensures close temperature

control with minimum energy usage

 Slim modern styling

 Large high contrast display with easy-to-read

characters

 Simple user interface

 Temperature setting procedure eliminates the

risk of accidental setpoint change

 Display shows room temperature, with option

to inquire about setpoint

 5°C to 35°C setpoint range with 0.5°C

increments

 Temperature set using up or down buttons

 Off/standby button, allowing manual switch off,

with frost protection active

 Adjustable off/standby setpoint 5°C to 16°C or

DT90 can be set to off completely

 Battery powered by 2 x AA (LR6) alkaline cells

 Up to 4 years battery life (minimum 2 years),

with battery low warning

 Simple battery change by unclipping front

cover

 Installer Mode allows the thermostat to be

customised for the application and the needs of

the user

 NVRAM storage of setup parameters, ensuring

these are never lost

 Setpoint limits can be programmed in

 24…230Vac SPDT potential-free contacts for

simple 2-wire installation

 8 A resistive, 3 A inductive switch rating

 Surface or switch-box mounting options

 Sensor fault self-diagnostics

 Heat/cool changeover operation mode possible

FEATURES UNIQUE TO DT90E ECO MODEL

 Energy saving ECO button allows user to

change to a lower, energy saving setpoint for a

timed period of their choosing (1…24 hours)

 Display shows countdown of time remaining in

ECO energy saving mode

Summary of content (8 pages)

PAGE 1
DT90 DIGITAL ROOM THERMOSTAT PRODUCT SPECIFICATION SHEET The new DT90 family of digital room thermostats is a range of market leading products designed to provide comfort with economy in modern heating systems. Its large display and simple button interface make DT90 extremely easy to use. Energy efficiency is addressed by state-of-the-art TPI control performance and an ECO button energy saving feature.
PAGE 2
DT90 DIGITAL ROOM THERMOSTAT CONTROLS / DISPLAY LAYOUT DT90E DT90A frost protect indicator heating demand indicator ECO mode active ECO countdown indicator setpoint change buttons temperature display ECO button setpoint indicator off/standby button fault indicator battery low warning off/standby indicator ECO mode countdown timer SPECIFICATIONS ELECTRICAL TEMPERATURE CONTROL Power supply  2 x 1.
PAGE 3
DT90 DIGITAL ROOM THERMOSTAT ORDERING SPECIFICATION Model DT90A1008 Description Digital room thermostat Literature Multi-lingual DT90E1012 Digital room thermostat with ECO energy saving feature Multi-lingual MAIN FEATURES Extra-Large Display The DT90 display is more than double the size of its predecessor, ensuring it is even easier to read and allowing more information to be displayed, when required.
PAGE 4
DT90 DIGITAL ROOM THERMOSTAT INSTALLATION Location DT90 is for use in normal domestic environments, and so should be located inside the house or building where the ambient temperature is within the range 0 to 40°C. Avoid locations with high levels of condensing moisture. As the temperature control element in the heating/cooling system, DT90 MUST be located in a position with good air circulation at average room temperature on an inside wall 1.2 to 1.5m from the floor.
PAGE 5
DT90 DIGITAL ROOM THERMOSTAT WIRING CONNECTIONS a. b. c. d. e. f. Boiler Boiler (potential free connection) Thermal actuator Zone valve Electric actuator Electric heat (maximum 1.
PAGE 6
DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE – APPLICATIONS SETTINGS The DT90 has a special Installer Mode where some features can be adjusted to suit the application and the needs or lifestyle of the user. Each adjustable feature is called a Parameter. These are described below.
PAGE 7
DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE – HOW TO SET PARAMETERS Each parameter is identified by a 2-letter code, and has a range of values. These are shown in the table below, followed by instructions on how to enter Installer Mode, how to select a parameter and change its value, and finally how to exit Installer Mode.
PAGE 8
DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE - FLOWCHART ES parameter Only available on DT90E models ENERGY EFFICIENCY AND THE ENVIRONMENT Home energy use is currently responsible for more than ¼ of the total carbon emissions which contribute to climate change. Heating and hot water systems based on boilers account for 2/3 of this figure, so it is important to understand how controls can help to maximize energy efficiency while maintaining comfort.