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You can thank Honeywell for that. It's their standard wiring diagram.good drawing but couple of flaws (in my book anyway).
The diagram was general, not specific to UV cylinders with temperature sensors.First is there is no cylinderstat strapped to the UV cylinder, second is position of grey wire to MVs
What's wrong with the grey wires? They always connect to a permanent live.
Point taken; I was generalizing too much. If the boiler has low/no volt switching the greys would be taken to an unused terminal in the WC, which would connect to one of the boiler no/low volt terminals. The oranges would then connect to the boiler's other no/low volt terminal.DH wrote
Not always. It is OK on systems that do not have switched live like old back boilers. You that on a modern boiler that is looking for condition on SL, boiler will still be live if internal fuse blown. In other cases do that to a boiler you will kill the electronics as boiler might be looking for voltage less than 240vWhat's wrong with the grey wires? They always connect to a permanent live.
Doitall, Y plan was a branch discussion, not related to UV installation. Last time I spoke with BC folk, I was told they could not care less whether a UV cylinder got notified or not, BUT if there was an injury or a fatality, the installer would be strung up with a rope round his gonads.
...do you have this ticket i wonder??
Yes thanks have you
OK, to save further arguments....lets just agree that if fitted incorrectly,
can't be many not fitted correctly then
Just for a laugh....saw one last year where the discharge pipework had been terminated into a condense pump!! Obviously not installed by a registered installer...let alone a competent person
There's a condensate pump designed to take the Discharge if I remember.
We do ours (when we feel like it [sic]) through Gas Safe.
Otherwise get the customer to do it through their LBA
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