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Honeywell L641A Cylinder thermostat

Brand: Honeywell
HCO Code: 12E01
Price: £22.61
Ex VAT: £18.84
Stock: In Stock
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Q: I currently have a Honeywell L641A1005. This is wired in with 4 wires Red, Brown, Black and Green & Yellow. I believe this new model uses only 2 wires, how would that wire in to this existing set up? I'm looking at a new 3 way motorised valve and actuator too...

A: This one will connect to your existing wiring. Except the earth wire which will just need to be isolated.
Q: Can it be used on a pipe? If so what diameter range? What is temperature differential? Is differential adjustable?

A: The L641B is for connection to pipe. Please see the link below. http://www.heatingcontrolsonline.co.uk/honeywell-l641b-pipe-thermostat-p-74.html

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The L641 is a range of thermostats designed for surface mounting on domestic hot water cylinders

* 4(2)A SPDT contacts
* Dimensions 79x44x54mm HxWxD

Model: L641A1039 (replaces L641A1005)

 

 

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