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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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central heating programmer re-wiring
my switchmaster 905 programmer has just packed in so i thought it was about
time to get a digital one ,Just come back from B&Q with a drayton tempus 7. After taking the front off the switchmaster it revealed this layout on the backplate N-L-1-2-A-B-C-3-4 n-neutral l-live 1 central heating ON 2 CH OFF A.B,C- SPARE 3 HW ON 4 HW OFF feeding this I had 2* 3 core cables 1st Cable - live neutral and the green cable screwed into the spare A 2nd cable - Brown into no1(CH ON) Blue into no 3(HW ON) and Green into No4(HW OFF) OK the new Drayton has this layout on its backplate N-L-1-2-3-4 N-neutral L-live 1 HW OFF 2 CH OFF 3 HW ON 4 CH ON so i connected the cables up as per diagram but did not know where to put the green cable from cable 1 - and assumed it was an earth cable so i plugged it into the earth socket . This configuration now leaves me without a connection into no 2 (CH OFF). I powered up the programmer and everything came on , Great I thought.Set the time ,adjusted the timer settings and set to auto. When the time came for the heating to come on - Nothing - No pump running or 3 port valve switching over Also nothing comes on in manual either. So can any of you kind people help me. Mark |
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In an earlier contribution to this discussion,
Mark Downey wrote: my switchmaster 905 programmer has just packed in so i thought it was about time to get a digital one ,Just come back from B&Q with a drayton tempus 7. After taking the front off the switchmaster it revealed this layout on the backplate N-L-1-2-A-B-C-3-4 n-neutral l-live 1 central heating ON 2 CH OFF A.B,C- SPARE 3 HW ON 4 HW OFF feeding this I had 2* 3 core cables 1st Cable - live neutral and the green cable screwed into the spare A 2nd cable - Brown into no1(CH ON) Blue into no 3(HW ON) and Green into No4(HW OFF) OK the new Drayton has this layout on its backplate N-L-1-2-3-4 N-neutral L-live 1 HW OFF 2 CH OFF 3 HW ON 4 CH ON so i connected the cables up as per diagram but did not know where to put the green cable from cable 1 - and assumed it was an earth cable so i plugged it into the earth socket . This configuration now leaves me without a connection into no 2 (CH OFF). I powered up the programmer and everything came on , Great I thought.Set the time ,adjusted the timer settings and set to auto. When the time came for the heating to come on - Nothing - No pump running or 3 port valve switching over Also nothing comes on in manual either. So can any of you kind people help me. Mark Is your room stat turned up high enough to make the heating come on? If you have a Y-plan system [See http://content.honeywell.com/uk/homes/systems.htm ] you don't need CH-OFF connected (but you *do* need HW-OFF). Do you have a central junction box where all the wires are connected? If all else fails, you'll need to trace the cables to find out what the other ends of these 2 x 3-core cables connect to. Incidentally, it's *extremely* bad practice to use the green or green/yellow earth conductors for carrying live signals such as HW-OFF - *and* very dangerous! -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
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