Honeywell DT90 manual

Honeywell DT90
8.3 · 29
PDF user manual
 · 8 pages
English
user manualHoneywell DT90

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

View the manual for the Honeywell DT90 here, for free. This manual comes under the category thermostat and has been rated by 29 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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Question and answer

Number of questions: 24
R
Ramón 18 October 2020

Does it display the room temperature as the same temperature that I set for the boiler to start, and does it not show the actual temperature in the room at that moment? In other words, does it display the temperature that I have chosen to start the boiler when it is at rest?

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ronald gorter11 February 2021

My thermostat, the DT90, says it is 28°C inside the house but it is actually 19°C. What should I do? Is it adjustable?

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K
Keith Arthurby10 November 2021

Which two terminals of 1, 2 and 3 at the Honeywell Wiring Centre correspond to the A and B terminals of the DT90 please?

Which two terminals of 1, 2 and 3 at the Honeywell Wiring Centre correspond to the A and B terminals of the DT90 please?
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Gavaneanu Daniel5 January 2022

I have a DT92A and I don't know how to make the settings so that the central heating starts less frequently.

I have a DT92A and I don't know how to make the settings so that the central heating starts less frequently.
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Pedro Francia19 January 2022

DT90 thermostat, the screen has turned off for me, I change the batteries and it remains off, however, the heating works. How can it be fixed? Thank you.

DT90 thermostat, the screen has turned off for me, I change the batteries and it remains off, however, the heating works. How...
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Z
Zenka13 December 2023

How do you connect the thermostat to your heating system? It can find YouTube instructions for the 92 model, but not for the 90 model.

How do you connect the thermostat to your heating system? It can find YouTube instructions for the 92 model, but not for the ...
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Sergi Punti10 December 2021

"I have changed the batteries of the thermostat, but it is not working with the new ones. The screen doesn't turn on. Any solution?"

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L
Laura30 December 2021

Hello, how do I connect the cables of the Honeywell DT90A? Could someone help me? Thank you.

Hello, how do I connect the cables of the Honeywell DT90A? Could someone help me? Thank you.
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Y
Yasmin19 January 2024

Just installed the Honeywell digital room thermostat. The installer said that you use the up button to insert temp. So I inserted 24 degrees . Then the display showed the room temp at 19 degrees and it didn’t go up to 24 degrees for 6 hours. We were freezing. What is wrong. Why so long for display to change . .

Just installed the Honeywell digital room thermostat. The installer said that you use the up button to insert temp. So I inse...
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The Honeywell DT90 is a thermostat designed for precise temperature control in homes and offices. With an accuracy of 0.5 °C, it ensures that the temperature set by the user is maintained within a half-degree range. The thermostat has an LCD display that shows the current temperature and the desired temperature. It is powered by two 230 V batteries, which are included in the package. The battery life is expected to last for up to two years. The Honeywell DT90 has a width of 90 millimeters, a depth of 27 millimeters, and a height of 92 millimeters. It is a compact device that can be installed on walls or placed on countertops. The thermostat does not have a memory function, which means that it cannot store the user's preferred temperature settings in case of a power outage. The Honeywell DT90 is a simple and straightforward thermostat that does not require remote control. It is suitable for people who want to manually adjust the temperature in their homes or offices. The thermostat is made from high-quality materials that ensure durability and reliability over time. It is a cost-effective solution for controlling the temperature in small to medium-sized spaces.

General
BrandHoneywell
ModelDT90 | DT90
Productthermostats
EAN5025121386128
LanguageEnglish
FiletypeManual (PDF)
Operational conditions
Accuracy0.5 °C
Temperature range (T-T)5 - 35 °C
Features
Memory functionNo
Product colourWhite
Display
DisplayLCD
Power
Number of batteries supported2
Battery voltage230 V
Battery life2 year(s)
Packaging content
Batteries includedYes
Remote control includedNo
Weight & dimensions
Width90 mm
Depth27 mm
Height92 mm
show more

Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the Honeywell DT90 below.

Where is the best location to place the thermostat?

The best place for the thermostat is the room where you spend the most time, in many cases the living room or kitchen. Place the thermostat about one and a half metres above the floor, not in the sun and not on an outside wall.

What is the dead band of a thermostat?

If your thermostat has a dead band, your installation is, as it were, 'at rest'. The thermostat only switches on when, for example, the difference deviates more than 2˚C from the set room temperature.

What is the ideal room temperature?

Most people find that the ideal room temperature is between 19 and 22 degrees Celsius.

What is the height of the Honeywell DT90?

The Honeywell DT90 has a height of 92 mm.

What is the width of the Honeywell DT90?

The Honeywell DT90 has a width of 90 mm.

What is the depth of the Honeywell DT90?

The Honeywell DT90 has a depth of 27 mm.

How do I set the desired temperature on the {Honeywell DT90} thermostat?

A temperature can be set by using the up and down arrow buttons on the thermostat to navigate to the desired temperature and pressing the select button to confirm.

What should I do if the thermostat display is blank?

Ensure that the thermostat is receiving power by checking the circuit breaker or fuse box. If the power supply is intact, consider checking the batteries in the thermostat and replace them if necessary.

How can I programme different heating times and temperature settings?

To program specific heating times and temperature settings, go to the "Program" menu on the thermostat using the menu button. From there, you can configure different time and temperature periods according to your preferred schedule.

Is it possible to override the programmed temperature and manually adjust it for a certain period?

Absolutely! By pressing the up or down arrow buttons on the thermostat, you can manually adjust the temperature to your preference. The override will be in effect until the next programmed temperature period starts.

How do I lock the thermostat to prevent unwanted temperature changes?

By accessing the "Settings" menu on the thermostat, you can navigate to the "Lock" option. From there, you can enable the lock feature, which will require a passcode to make any changes to the thermostat settings or temperatures.

What is the accuracy of the Honeywell DT90 thermostat?

The Honeywell DT90 thermostat has an accuracy of 0.5 °C. This implies that the temperature readings are precise up to 0.5 °C, allowing for accurate control of the heating or cooling system.

Does the Honeywell DT90 thermostat have a memory function?

No, the Honeywell DT90 thermostat does not have a memory function. This means that it does not retain any programmed settings or temperature history, requiring the user to manually set the desired temperature each time.

What type of display does the Honeywell DT90 thermostat have?

The Honeywell DT90 thermostat has an LCD display. This provides clear and easy-to-read temperature information and settings, enhancing the user experience.

How many batteries does the Honeywell DT90 thermostat support?

The Honeywell DT90 thermostat supports 2 batteries. This ensures a reliable power supply for the thermostat, preventing any interruptions in temperature control.

Does the Honeywell DT90 thermostat come with batteries included?

Yes, the Honeywell DT90 thermostat comes with batteries included. This allows for immediate use and convenience, as the user does not need to buy extra batteries separately.

Is the manual of the Honeywell DT90 available in English?

Yes, the manual of the Honeywell DT90 is available in English .

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