Honeywell DT90 manual

Honeywell DT90
8.3 · 19
PDF user manual
 · 8 pages
user manualHoneywell DT90

EN0H 8578 UK07 R1 12/08



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.
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
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
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
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
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

View the manual for the Honeywell DT90 here, for free. This manual comes under the category Thermostat and has been rated by 19 people with an average of a 8.3. This manual is available in the following languages: English. Do you have a question about the Honeywell DT90 or do you need help? Ask your question here

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Helen Whitlock • 20-9-2022No comments

How do I re bind a new one

How do I re bind a new one
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Brian Dennis • 11-3-2022No comments

DT90A currently set at 23.5. How do I reset to 22 room temp.

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Number of questions: 2

DT90 | DT90
manual_type_manual (PDF)
Operational conditions
Accuracy0.5 °C
Temperature range (T-T)5 - 35 °C
Memory function
Product colourWhite
Number of batteries supported2
Battery voltage230 V
Battery life2 year(s)
Packaging content
Batteries included
Remote control included
Weight & dimensions
Width90 mm
Depth27 mm
Height92 mm
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