Originally posted by G4RHL
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Evohome new install
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Originally posted by jb80 View PostI have a similar situation with a Telford unvented cylinder. I am trying to work out where to install the Evohome insertion sensor probe. Should I replace the immersion heater element with the sensor?
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Originally posted by G4RHL View PostIf you do you will have no emergency backup to heat the tank. I am sure someone here has done this. I just used the external sensor which was fine. No issues.
So in my case, the engineer cut a small hole in the outer insulation of the tank and put the sensor inside. This was then cover up. Its been working fine ever since (been three years now).
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Originally posted by jb80 View PostI have a similar situation with a Telford unvented cylinder. I am trying to work out where to install the Evohome insertion sensor probe. Should I replace the immersion heater element with the sensor?
Photos attached of the final solution. I hope someone finds it useful
20220714_205323.jpg
20220714_205338.jpg
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Hi - I realise this is an old post but wonder if JB80 is still reading - I noticed for your DHW you simply fitted the HW sensor through a hole in your current sensor set up.
Can you elaborate on your set up please i.e. the CS92A and hoe the BDR91 is used for the HW (is it attached to an existing backplate you have?) I have a virtual identical set up as you and am looking to fit the Evohome HW kit as you haveLast edited by Backofthenet; 22 December 2022, 06:47 PM.
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I temporarily removed the existing Telford Aquastat cylinder thermostat (ALTTGSTAT), removed the cover and then fed the Honeywell insertion sensor (F50079510-001) through the hole of the Telford stat. Reassembled and then fed both temperature probes back into the cylinder pocket. Honeywell insertion sensor is wired to the Evohome hotwater wireless sensor. By doing so, it maintains the thermal cut-out with separate temperature feedback to Evohome for control.
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Thanks for the quick reply - quite ingenius and i understand that bit.
It's what happens after - I think you have wired the sensor probe to a CS92A thermostat?
Is that CS92A then bound to a BDR91? Its more the bit about how the thermostat links to the evohome controller so the controller can control your hot water.
I have the evohome controller bound to a BDR91 - the BDR91 is linked to my backplate for CH control so I am looking to extend the evohome controller to control my DHW. My DHW is still controlled via a honeywell ST9400C two channel programmer for DHW
apologies if I sound a bit dumbLast edited by Backofthenet; 23 December 2022, 03:56 PM.
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Thanks
a small project for after Christmas
If I post pictures and explanation of my current set-up after the Christmas break would appreciate some input on what wires go where for the DHW BDR91.Last edited by Backofthenet; 24 December 2022, 08:23 PM.
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Hi Bruce_Miranda
So my current set up is as follows which I believe is Y Plan configuration
I have an ST9400C 2 channel Programmer wired to an industry standard back plate which still controls HW. Please see Pic of backplate
I also have a BDR91 wired into the same backplate for controlling the CH and the ST9400C is effectively set to off for the CH channel such that all Rad's are controlled via Evohome controller bound to the BDR91.
The BDR91 is wired into N, L and Position 4 ( CH ON) on the backplate
So for the second BDR91 will it be a case of wiring into N, L and Position 3 (HW ON) then Binding the second BDR91 to Evohome controller and setting up HW control via Evohome controller / setting HW channel to off on ST9400C?
PS - Understand I have to also fit the temp probe and CS92A to HW Cylinder and then bind CS92A to evohome controller for temp monitoring.
IMG_6007.jpg
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Originally posted by Backofthenet View PostSo for the second BDR91 will it be a case of wiring into N, L and Position 3 (HW ON) then Binding the second BDR91 to Evohome controller and setting up HW control via Evohome controller / setting HW channel to off on ST9400C?
If you don't remove the original adjustable cylinder stat you may want to adjust it upwards to ensure the new insertion sensor can reliably reach target temperature. If it cuts off HW heating at ~57C while Evohome is waiting to reach 60C then (with DHW priority) you may be without CH for a while. That's probably a "safer" option that trying to remove it from the wiring while leaving the fixed safety stat in place - which is typically in series with the adjustable one.
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