Wireless relay for evohome | Switches valves, pumps or boilers | Heat pump and heat/cool use | Permanent 230V supply | Relay and radio LEDs
Overview
The Honeywell Home BDR91T is a wireless relay box. Resideo, which makes Honeywell Home products, lists it on its GB site as the BDR91T1004 spare receiver, a “wireless receiver for evohome”, and its guide says the BDR91 can be used to switch valves, pumps, boilers or other heat sources. Resideo’s evohome installation guide uses a BDR91A or BDR91T to control a zone valve, or a boiler or buffer tank secondary pump, and says to use a BDR91T if you are controlling a heat pump directly or for heat/cool changeover.
It needs a permanent 230V supply and is wired to the boiler or heating system, so Resideo says it should be installed by a competent person, with the power isolated before wiring. It is switched by radio from the controller it is bound to. Resideo’s wiring guide says the BDR91 is for use with the evohome system, and its 2020 Wireless Binding Guide also has BDR91 sections for the DTS92, T87RF, CM900RF and ST9000RF. A green LED shows the relay is on, and a red LED lights if radio contact is lost, when the relay runs in the failsafe mode set in Installer Mode.
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Key Features
Pros & Cons
Pros
Cons
Versions, Kits and What You Need
Good to Know
The list above is Resideo’s guidance on which relay to use for each job, from its evohome installation guide. The BDR91T needs a compatible controller to switch it, such as an evohome controller.
Resideo’s guide for its newer evohome R3 controller, published for EMEA, says “this Evotouch will not work with the older BDR91”, so check which relay your controller needs before you buy.
Setup & Installation
Resideo says the BDR91 should be installed by a competent person, with the power isolated before wiring. Its guide says to leave at least 30 cm between the relay box and any metal objects, including wall boxes and boiler housing, and not to mount it on a metal wall box.
To bind it to an evohome controller, Resideo’s installation guide says to press and hold the button for 15 seconds, until the red LED blinks rapidly, to clear any previous binding data, then press and hold it again for 5 seconds, until the red LED blinks slowly. Then bind it from the evohome controller: you should see a SUCCESS message on the controller, and the LED on the relay box should stop blinking.
Common Problems & Fixes
Running into issues? Our Honeywell Home troubleshooting guide covers step-by-step fixes taken from Resideo’s own support pages, including red light or not switching.
Who Should Buy It
Anyone with an evohome controller that supports the BDR91 who needs a wireless relay to switch a zone valve, boiler or pump, or to control a heat pump directly.
Verdict
The Honeywell Home BDR91T is one of the wireless relays Resideo names for evohome zone valves, boilers and pumps, and the one it says to use for direct heat pump control or heat/cool changeover. It is mains-wired, so it needs a competent installer.
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Need a hand with this?
The BDR91 is mains-wired, and Resideo says it should be installed by a competent person. A heating engineer can fit it or find the fault, and any work on the boiler itself must be done by a Gas Safe registered engineer. You can compare up to 3 quotes from local heating engineers.
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