The missing blanks from the normal consumer unit need to be replaced. I guess the space was once filled with the 2 LeGrill MCBs now in the off peak board.
new immersion heater control
- Thread starter leafyman
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How do you know that there are gaps in it?
Strangely I didn't try clicking the thumbnails in a post where there were two photos, the same, two thumbnails which were also the same, and wrt which the poster wrote "Well I dunno how I got two the same".
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Okay, I've taken off the front cover and the eight mcb's are all connected up.Quite what the two on the left are connected to, I don't know.
As the unit is all Economy 7 I'll have to wait until after 1am to put my testing screwdriver on the mcbs.
Then, I'll turn off the two on the left, which are labelled B16 (the others are B20) and see if I can track down some devices which are n't working.
As the unit is all Economy 7 I'll have to wait until after 1am to put my testing screwdriver on the mcbs.
Then, I'll turn off the two on the left, which are labelled B16 (the others are B20) and see if I can track down some devices which are n't working.
All that will tell you, if it works, is that your off-peak supply has started, and I didn't think there was any question about that.
In any event you should stop using that magic wand and get a proper 2-pole tester.
If flameport's guess is right they'll be one storage heater and one immersion.
best think to do it put all the MCB down, wait for the night rate to switch over.
Then turn the 2 legrand ones on. Go check out your heaters and see if any are making pinging noises or getting warm.
When your confident 1 or 2 are working, you can flick the others on.
One of them voltage wonds may actually be useful here!
Then turn the 2 legrand ones on. Go check out your heaters and see if any are making pinging noises or getting warm.
When your confident 1 or 2 are working, you can flick the others on.
One of them voltage wonds may actually be useful here!
Right, sorry to be late replying.
I carried out AndyPRK' s great suggestion: all the MCBs down beforehand, put up the two legrand ones and checked straight after the change to night rate. Nothing getting warmed up, nothing not working in the house. I put them down, lifted up the others and this morning all the storage rads are beautifully hot.
What I'll have to do is disconnect the cables to the two in question and clamber around the loft to see where the cables are leading - could just be to a disused junction box or something.
Anyway, I now know what to do: connect the lower immersion heater to a spare mcb in my Economy 7 consumer unit for controlled night water heating; and connect the upper heater to its own mcb in the main house consumer unit for daytime boosts. Using a couple of the 20amp switches from Screwfix for airing cupboard control as necessary.
Dunno why I didn't think of this myself, except for the fact that I'm not the sharpest knife in the drawer. You guys on all the diynot forums are bloody marvellous. I can't tell you how much I appreciate you. Many thanks to all.
I carried out AndyPRK' s great suggestion: all the MCBs down beforehand, put up the two legrand ones and checked straight after the change to night rate. Nothing getting warmed up, nothing not working in the house. I put them down, lifted up the others and this morning all the storage rads are beautifully hot.
What I'll have to do is disconnect the cables to the two in question and clamber around the loft to see where the cables are leading - could just be to a disused junction box or something.
Anyway, I now know what to do: connect the lower immersion heater to a spare mcb in my Economy 7 consumer unit for controlled night water heating; and connect the upper heater to its own mcb in the main house consumer unit for daytime boosts. Using a couple of the 20amp switches from Screwfix for airing cupboard control as necessary.
Dunno why I didn't think of this myself, except for the fact that I'm not the sharpest knife in the drawer. You guys on all the diynot forums are bloody marvellous. I can't tell you how much I appreciate you. Many thanks to all.
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When you switched on the two legrand 16 amp mcbs ,how did you determine whether the lower immersion heater was ,or was not ,connected to either of them ?
I would really recommend the small timer in the first post for the top heater.
You will never forget to turn off that expensive elec then!
However those new tanks do hold heat well, so you may not need to use it. So as a minimum get a 20A switch with neon light, so at least its obvious the top one is on.
Did you old tank have two heaters?
Picture of old tank switches would be interesting
You will never forget to turn off that expensive elec then!
However those new tanks do hold heat well, so you may not need to use it. So as a minimum get a 20A switch with neon light, so at least its obvious the top one is on.
Did you old tank have two heaters?
Picture of old tank switches would be interesting
The lower immersion heater is connected to an mcb on the main consumer unit, not to any coming from the Econ 7 unit.
The old copper tank had two immersion heaters with only the lower one still in use. I don't have anything old to photo now.
I've been up in the loft today and have tracked the cable from one of legrand 16B MCB's to an unused storage rad outlet in a wall behind a cupboard. There have been a few changes n the house itself, and a few different makes of storage rads used by somebody, which explains why I didn't know the outlet was there.
When I've stopped itching I'll track down the other 16B to its conclusion. Looks like my problem is is nearing a solution.
The old copper tank had two immersion heaters with only the lower one still in use. I don't have anything old to photo now.
I've been up in the loft today and have tracked the cable from one of legrand 16B MCB's to an unused storage rad outlet in a wall behind a cupboard. There have been a few changes n the house itself, and a few different makes of storage rads used by somebody, which explains why I didn't know the outlet was there.
When I've stopped itching I'll track down the other 16B to its conclusion. Looks like my problem is is nearing a solution.
Spare outlet anyway close to the tank ?
Get some of these for the next time grovelling in loft insulation: https://www.toolstation.com/shop/p90430
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A lagger once told me showering in tepid water is the best way to decontaminate
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