CH Boiler Wiring

[Stuart]

My Potterton CH boiler is wired up from a spur to the programmer with 2.5 T+E to the boiler and 1.5 T+E to the pump. I am fitting a replacement timer ( Danfoss 102) .It says to connect it from either an unswitched socket or a DP switch outlet with neon. I was intending to use 2.5 T+E to the DP outlet but is it ok to use suitably rated flex for the other (boiler and pump) connections as it is easier to manipulate .? Stuart

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[BigWallop]

Sure, you can use 1.5 mm or 2.5 mm csa' flex OK, but if it is passing any hot spots en route, then get heat resistant stuff.

[John]

I hope your existing set up uses a "fused" connection unit (spur) The "standard" supply to a domestic boiler/heating control system is via a 3 Ampere fuse so 2.5 is vastly overrated. A heat resistant (100C) flex is good practice in case it rests against a hot pipe or similar. Offhand I can't think of any commonly sold sheathed mains flex with a rating less than 3A but I'd suggest something around 0.5 or 0.75mm which as you say is easier to manipulate. A word of advice - I think the 102 is a single zone timer. If you are controlling heating and hot water the current spec is for independant time and temperature control to both zones thus you should have a modern two channel programmer. Perhaps you are simply doing a like for like maintenance swap?

[OldBill]

I'd go further than that and say forget the mains driven Danfoss 102. Its dated technology. Replace it with one of the modern battery powered programmers

[Stuart]

It was wired up via a junction box spurred from an adjacent socket so I have replaced that with an unswitched socket /plug ( 3 amp fused) as per the leaflet instructions until I get a fsu

Yeah .simpler the better .I just switch HW or CH+HW on as required .The previous Towerchron timer was a simple one as well. thx for help Stuart

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[Stuart]

It was bought cheaply off Ebay so it will do for now . Stuart

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