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
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?"

This message has been automatically translated
L
Lesley CollinsJanuary 2, 2021

Our thermostat is intermittently sulking and although it looks like it’s working the rads get cold. Have tried new batteries and turning it on and iff

A
AllanApril 6, 2021

What does it mean if neither red nor green light is showing on the wireless relay. If the thermostat is working correctly shouldn’t the relay be showing a constant green light?

D
dominicOctober 11, 2021

when i try to bond the DT90e on the second step witch is to move down from inst to count, why will it not let me scroll down? i cn go up and then down but not down to count. Can you help

L
Laurette ReadOctober 18, 2021

If your portable thermostat says 5 and you don't know if the green Eco button was the last thing you pressed OR NOT and you keep trying the upward arrow to get the heat setting you want without success what can you do?

J
John SmithJanuary 19, 2024

The ambient temperature is showing as 13 degrees when the actual room temp is much higher, the heating is set to reach 17 degrees but it still shows as 13. Can you help

K
Kim McleanJanuary 29, 2024

Hi How do i get the DT90 to sync with my boiler as since changing the batteries i have lost this so i cant turn the heating on by turning up the temperature.

M
MalcolmFebruary 16, 2021

Hi, I have just purchased the DT 90 E stat to replace an old 3 wire stat, forgive me but which terminal should the third (load ) wire be connected to, at the moment I am blowing fuses or getting no reaction from the boiler as in no heat. I would appreciate any advice. Many thanks.

K
Keith harveyNovember 8, 2021

My DT90 all ways switch off half deg higher than set point is this normal? Thanks

G
Geoffrey GWYNNEDecember 13, 2021

Having successfully installed my DT90E, must I enter Installer Mode before I can use it operationally?

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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