Image is for illustration only and should not be relied upon Honeywell DT90e Wired Digital Room Thermostat

Honeywell DT90e Wired Digital Room Thermostat

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£54.54

Ex VAT: £45.45

Brand: Resideo (Honeywell)

HCO Code: 06D04

Availability: In Stock

Replaces Obsolete DT200 (T6620B1008)

The DT90E digital room thermostat has been designed to provide automatic temperature control of gas or oil fired boiler systems underfloor heating electric heating and zoning systems. Energy efficiency is addressed by state of the art control performance qualifying it as a Load Compensator. The DT90E has an ECO button energy saving feature which gives timed setback or boosts temperatures to reduce energy demand. This is a TPI (Time Proportional Integral) control product as defined in the Building Regulations which make boilers operate more efficiently and provide close accurate control. The ‘OFF’ setting can be used for frost or hypothermia protection assuming the system time control is also switched on. 'Installer Mode' allows control to be matched to the system and user requirements adapting minimum on or off times set point controls etc. Two wire volt free connections are ideal for use with combination boilers or heating zones.

* Features:
* Energy saving TPI control
* ECO button for energy saving mode
* Simple user operation
* 5 to 35°C set point range
* 'OFF' setting with adjustable OFF setpoint
* Direct replacement of the DT200 digital thermostat
* Mains or low voltage switching
* Two wire connection
* 8(3)Amp contacts
* Dimensions: 90x92x27mm

Please Note: When replacing a traditional thermostat with a digital thermostat it is important that any neutral wire is safely isolated and NOT connected the the digital thermostat.

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I have a T6360B thermostat and I see I can use the DT90E to replace it. How do I isolate the neutral and earth wires? Answers1

You can place each wire in a terminal strip with nothing the other side. Then wrap in electrical tape.

Hi, I want to replace an old dial type Honeywell thermostat with one of these but can I check before I order. The current wiring in the old unit is Red - 1, Blue - 2, Yellow - 3. Will this replace it and if so what is the wiring arrangement for the new unit please? Answers1

Hi.
Yes it will. Red to A, yellow to B.
The blue should be isolated and not connected to the DT90e.

Hi, i have 2 Honeywell T6620B digital stats. Using 1 as a frost stat up in the loft and 1 on the landing. The stat in the loft has gone blank with the spanner symbol and would now continously keep the boiler running. So i am now using the 1 from the landing. Can i replace this T6620B with the DT90e stat?
Thanks Answers1

Hi. Yes, it will connect to the same 2 wires.

I have replaced an EPH programmable boiler stat with the Honeywell Home DT90E1012 Digital Room Thermostat I only wanted a simple digital up down type thermostat looking at the complex settings option which I haven’t touched I have noticed that sometimes lets say I have set the stat at 19c and would expect it to go off at say 19.5c or any combination of a .5c range I have noticed that on some occasions it might fire the boiler up outside this range and only stay on a few seconds with no change to the set range could this be a feature of the stat to just keep boiler warm normally it does work within the .5 range I dare not adjust the settings feature in case I cannot reset it
Any help appreciated Answers1

It sounds like the TPI feature. It is a fuel saving feature and is best left alone unless there is temperature discomfort.

Does this have a back light on the display ? Answers1

No, the DT90E does not have a backlight feature.

Can this be used in place of a Drayton Digistat 1 using the 2 wires existing? Answers1

Yes it can.

Hi can I use this as a replacement for a Sunvic TLM-2253 thanks.. Answers1

Hi. As long as it is controlling a gas or oil boiler. The DT90e is not suitable for electrical heating.

Would I be able to replace my Honeywell CM907 with one of these? Answers1

Yes you could. However these cannot be programmed.

Will it replace an old Honeywell thermostat with blue, yellow & Red wires Answers1

Yes. The neutral is not needed, so isolate it.

Hi. Will the DT90E replace my 230 volt Honeywell analogue T6360 unit? Currently there is a yellow in terminal 1 and a blue in terminal 3 (I assume this is live and switched live respectively and that the wrong colours were used by whoever wired it?). If this is a good replacement which terminal does my yellow go into and which terminal does my blue go into on the DT90E? Likely I will purchase from yourselves :-) Answers1

Yes it will. If you have a wire in terminal 2, you will need to isolate it. Wiring as follows: T6360 - DT90e 1 - A 3 - B 4 - C If terminal 4 is empty, leave terminal C empty.