Honeywell DT90 manual

Honeywell DT90
8.3 · 29
PDF manual
 · 8 pages
English
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: 29
R
Ramón October 18, 2020

Marks as ambient temperature the same as I program for the boiler to start up and does not show the actual temperature in the environment at that moment. In other words, what it shows at rest is the one I have chosen to start up the boiler.

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R
ronald gorterFebruary 11, 2021

My thermostat DT90 shows that it is 28 degrees indoors, but it is actually 19 degrees. What should I do? Can it be adjusted?

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K
Keith ArthurbyNovember 10, 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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E
Emma of manua.lsDecember 18, 2023

The two terminals, 1 and 2, at the Honeywell Wiring Centre correspond to the A and B terminals of the Honeywell DT90 thermostat.

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G
Gavaneanu DanielJanuary 5, 2022

I have a DT92A and I do not know how to make the settings so that the heating starts less often.

I have a DT92A and I do not know how to make the settings so that the heating starts less often.
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P
Pedro FranciaJanuary 19, 2022

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

DT90 thermostat, the screen has turned off, I changed the batteries and it remains off, however the heating works. How can it...
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Z
ZenkaDecember 13, 2023

How do you pair the thermostat to your heating? It can find you tube instructions for the 92 but not the 90.

How do you pair the thermostat to your heating? It can find you tube instructions for the 92 but not the 90.
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E
Emma of manua.lsFebruary 19, 2024

To pair the Honeywell DT90 thermostat to your heating system, follow these steps: 1. Make sure the thermostat is inside the building where the temperature is between 0 to 40°C. Avoid locations with high moisture levels. 2. Place the thermostat on an interior wall, 1.2 to 1.5 meters from the floor, with good air circulation at room temperature. Avoid placing it near heat sources like radiators, hot air vents, TV, lights, doors, windows, or direct sunlight. 3. Mount the DT90 thermostat on the wall or an electrical wall box. It comes in two parts for easy wiring backplate installation. 4. Connect the wiring following the latest Electrical Regulations. Make sure the wiring is connected through a fuse rated at a maximum of 8 amps and a switch with a contact separation of at least 3mm in all poles. 5. Once the wiring is done, attach the front piece of the thermostat to the backplate with a hinging action until it clips into place. Note that the DT90 thermostat is battery-powered, so only a 2-wire connection is needed to operate the load. Electric heating loads up to 8A (1.6kW) can be switched directly. If switching more than 3A, set the electric heat parameter EH to value = 1 in the Installer Mode for reliable relay operation.

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S
Sergi PuntiDecember 10, 2021

"I have changed the batteries of the thermostat, but it's not working with the new ones because the screen doesn't turn on. Do you have any solution?"

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L
LauraDecember 30, 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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A
Angela wardleDecember 21, 2021

My thermostat is set for 18c but as you see is up to higher temperatures with a flashing symbol in right corner. What is the flashing symbol bottom right corner.

My thermostat is set for 18c but as you see is up to higher temperatures with a flashing symbol in right corner. What is the ...
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J
John CrawfordMarch 22, 2023

It is hard to get it to switch off at 18c is the thermostat in central area I have noticed my self temperatures can fluctate even with mechanical thermostats

The Honeywell DT90 is a thermostat that offers reliable temperature control for your home or office space. With an accuracy of 0.5 °C, it provides precise and consistent readings to ensure optimal comfort. The thermostat features a clear LCD display, making it easy to read and adjust the temperature as needed. Powered by two 230 V batteries, the Honeywell DT90 has a battery life of 2 years, minimizing the need for frequent battery replacements. Additionally, it comes with batteries included, saving you time and money. Although it does not have a memory function, it still offers effective temperature control for your space. Measuring 90 millimeters in width, 27 millimeters in depth, and 92 millimeters in height, the Honeywell DT90 is compact and can be easily mounted on your wall. Its sleek design seamlessly blends with any interior decor. While the Honeywell DT90 does not include a remote control, it can be manually adjusted on the thermostat itself. This simplicity may be preferred by some users who prefer a more hands-on approach. Overall, the Honeywell DT90 thermostat offers accurate temperature control with its clear LCD display. Its compact size and durable construction ensure reliability and longevity. The thermostat is an ideal choice for those seeking a straightforward and effective solution for maintaining a comfortable indoor environment.

General
BrandHoneywell
ModelDT90 | DT90
Productthermostats
EAN5025121386128
LanguageEnglish
FiletypeUser manual (PDF)
Operational conditions
Accuracy0.5 °C
Temperature range (T-T)5 - 35 °C
Features
Memory functionNo
Product colorWhite
Display
DisplayLCD
Power
Number of batteries supported2
Battery voltage230 V
Battery life2 year(s)
Packaging content
Batteries includedYes
Handheld remote controlNo
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 program different heating times and temperature settings?

To program specific heating times and temperature settings, navigate to the "Program" menu on the thermostat using the menu button. From there, you can set up different time and temperature periods based on your desired 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 accuracy of the Honeywell DT90 thermostat is 0.5 °C. This means that the temperature readings are precise up to 0.5 °C, providing 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 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 purchase additional 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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