Suppressors - S plan central heating

[ricky101]

Hi,

Trying to establish if things like room stats, cylinder stats and motorised valves are internally fitted with contact suppressors ?

Reason asking is that something is causing a zone of the burglar alarm to activate, the times coinside with the heating coming on in the morning.
All the devices are reasonably modern, certainly not more the 6 years old.

Other than fitting a mains rated contact suppressor to each device, any suggestions of any other type of mains filter /suppressor that would help ?

thanks

 

[Echo the husky]

I assume you have a wireless alarm? Has this problem started recently? Any changes to any of the systems?
Depending on what boiler you have, contact suppressors can allow enough current to flow to cause them to fire up.

 

[ricky101]

Hi,

No, the alarm is all wired, the zone giving the problem is just 3 magnetic contacts, the whole system is 6 months old, a straight forwards diy Honeywell Acentra.

The 3 false alarms just given this week, all happening when the hot water cyliner is being heated; nothing changed on the alarm or heating since installation, no other problems experienced.

Though most of the heating controls are fairly new, Honeywell valves, Drayton Stats and a bit older L&G controller ; the boiler is a Pot Falmingo RS40 . The whole central heating rewired a year ago.

Have verified that outsite interference has not set off the mag contacts.

 

[endecotp]

Do the alarm wires run adjacent to the heating control wires for any significant distance?

 

[ricky101]

Do the alarm wires run adjacent to the heating control wires for any significant distance?

No, thanks, was aware of that potential problem when I wired up.

However the zone wires do pass, (not run alongside) within foot or so of the heating wires, might just try covering the zone wires in foil connected to earth.

Despite many attempts at manually starting and stopping the heating from its controller have not been able to replicate the fault.

Am still changing the heating on times to see if the alarm follows it, so far it has.

Did think a Honeywell alarm would be well designed and have both hardware filters and software debouncing to avoid such electrical glitches, or is that wishfull thinking on my part ?

Might try a ferrite where the suspect zone cable enters the controller..

 

[stillp]

is that wishfull thinking on my part ?

Yes.