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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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'pump plan' type wiring with 1 relay?
I need to fix up proper controls on a CH system that has separate pumps
driving CH and DHW. At the moment there is no stat on the HW cylinder so $DEITY knows how it's wired. (The wiring seems to be crammed into a back box behind the programmer so I haven't investigated yet, but my money is not on it having proper interlock between CH and DHW systems and the boiler.) The pipework layout makes conversion to a Y plan or a packaged Grundfos Pump Plan (tm) a very unattractive option so I need to arrange proper temp control on the DHW and interlock with the boiler. I know I can do it with 2 relays with their contacts wire-ORed to drive the boiler Switched-Live: prett Programmer Room stat ---- ---- L ---o o-----------o o--------+--------+ | | CH pump () | RLA | | | N ------------------------------+--------+ Programmer Cyl stat ---- ---- L ---o o-----------o o--------+--------+ | | DHW pump () | RLB | | | N ------------------------------+--------+ L ----------------+--------------+ | | o | o | A | B | o | o | | | +-------+------+ | --------- | SL | | boiler | | N | ---------- | N ------------------------+ - but ISTR seeing somewhere a single relay solution. I'm damned if I can see how that would work but willing to be proved wrong :-) Incidentally has anyone grokked how the Grundfos pump plan wiring centre does it? IIRC there's no relay in the box so presumably it's some sort of triac cct with wired-OR to the gate. |
#2
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'pump plan' type wiring with 1 relay?
In message , John Stumbles
writes I need to fix up proper controls on a CH system that has separate pumps driving CH and DHW. At the moment there is no stat on the HW cylinder so $DEITY knows how it's wired. Are you sure you are inside the legal envelope (so to speak) doing this ? -- geoff |
#3
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'pump plan' type wiring with 1 relay?
On Sun, 03 Sep 2006 18:50:34 +0000, raden wrote:
In message , John Stumbles writes I need to fix up proper controls on a CH system that has separate pumps driving CH and DHW. At the moment there is no stat on the HW cylinder so $DEITY knows how it's wired. Are you sure you are inside the legal envelope (so to speak) doing this ? I assume you mean wrt Part P? As I read it (unfortunately 2 slags' numpties have disabled ^C on the AD but the words I want are 'replacing any fixed electrical apparatus' and 'not include ... any new fixed cabling') my wiring centre with the relay[s] in it are my 'fixed electrical apparatus' and as long as I only use flex (preferably bellwire (joined with choch-blox) :-) rather than T&E to hook everything up I should be OK. |
#4
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'pump plan' type wiring with 1 relay?
On Sun, 03 Sep 2006 20:32:14 +0000, John Stumbles wrote:
On Sun, 03 Sep 2006 18:50:34 +0000, raden wrote: Are you sure you are inside the legal envelope (so to speak) doing this ? I assume you mean wrt Part P? As I read it (unfortunately 2 slags' numpties have disabled ^C on the AD but the words I want are 'replacing any fixed electrical apparatus' and 'not include ... any new fixed cabling') my wiring centre with the relay[s] in it are my 'fixed electrical apparatus' and as long as I only use flex (preferably bellwire (joined with choch-blox) :-) rather than T&E to hook everything up I should be OK. Oops, reading further it advises that 'new CH control wiring installations are notifiable'. Bummer. |
#5
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'pump plan' type wiring with 1 relay?
In message , John Stumbles
writes On Sun, 03 Sep 2006 20:32:14 +0000, John Stumbles wrote: On Sun, 03 Sep 2006 18:50:34 +0000, raden wrote: Are you sure you are inside the legal envelope (so to speak) doing this ? I assume you mean wrt Part P? As I read it (unfortunately 2 slags' numpties have disabled ^C on the AD but the words I want are 'replacing any fixed electrical apparatus' and 'not include ... any new fixed cabling') my wiring centre with the relay[s] in it are my 'fixed electrical apparatus' and as long as I only use flex (preferably bellwire (joined with choch-blox) :-) rather than T&E to hook everything up I should be OK. Oops, reading further it advises that 'new CH control wiring installations are notifiable'. Bummer. Hmmm, there you go -- geoff |
#6
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'pump plan' type wiring with 1 relay?
In an earlier contribution to this discussion,
John Stumbles wrote: On Sun, 03 Sep 2006 20:32:14 +0000, John Stumbles wrote: On Sun, 03 Sep 2006 18:50:34 +0000, raden wrote: Are you sure you are inside the legal envelope (so to speak) doing this ? I assume you mean wrt Part P? As I read it (unfortunately 2 slags' numpties have disabled ^C on the AD but the words I want are 'replacing any fixed electrical apparatus' and 'not include ... any new fixed cabling') my wiring centre with the relay[s] in it are my 'fixed electrical apparatus' and as long as I only use flex (preferably bellwire (joined with choch-blox) :-) rather than T&E to hook everything up I should be OK. Oops, reading further it advises that 'new CH control wiring installations are notifiable'. Bummer. Yes, but what reaction are you expecting from your local Builing Control department when you submit a Building Notice saying "I am going to replace my CH controller" or whatever? If you know what you're doing, just *do* it! Unless you're selling your house next week, it will get lost in the noise. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#7
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'pump plan' type wiring with 1 relay?
On Tue, 05 Sep 2006 15:50:57 +0100, Roger Mills wrote:
If you know what you're doing, just *do* it! Unless you're selling your house next week, it will get lost in the noise. Gosh, I'm shocked! The thought never even crossed my mind :-) |
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