RE: Re: [OT] ishh central heating controls

["LeeUKHA" <mailinglists@xxxxxxxxxxx>]

Chaps,

First off, the note of caution has been noted. My electrical skills are OK,
it's my design skills that are suspect, hence this thread.

Following Deans fantastic diagram this seems like the direction to head in,
so here's the plan.

1)Put a new surface mount box with two 240V sockets in the airing cupboard,
powered by the CH/HW wiring box.
2)Plug two X10 appliance modules into it.
3)Put two 240V plugs with short leads into these modules.
4)Put another two gang surface mount box, under the first, in the air
cupboard.
5)Mount 1 x DPDT (240V coil) relay and 1 x SPDT (240V coil) with bases,
into
(4).
6)Remove the CH, HW and NoHW 240V lines from the wiring box and wire them
to
the relays as per Deans diagram.
7)Add 3 x new leads from the relays back to the wiring box, as per Deans
diagram.
8)Wire the L & N from each lead (3) to the relay coils.

This gives me X10 control of the HW/CH (while disconnecting the existing
controller), but while X10 is being used, the existing controller can still
be used to give 1 hour boost to the CH/HW. Nice. Can anyone see any
problems?

My last question (and it may be the deal breaker) which only occurred as I
wrote this email is - do these 240V coil relays buzz loudly when they are
active?

Cheers,
Lee

-----Original Message-----
From: Dean Smith [mailto:dean@xxxxxxx]
Sent: 16 October 2004 19:06
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Re: [OT] ishh central heating controls


I placed relays after the existing CH controller but before the
Thermostats.

When un-energised (?) these simply pass the existing controller signals
through. When energised they disconnect the original and pass 240V as
required.

The CH is therefore a DPST . The HW is a DPDT - and disconnects both HW-ON
and HW-OFF controls and gives 240V to HW-ON only so no matter what the
origianl controller was asking for - I can over-ride.

I ran it like this for some time using Comfort to control the relays for
+1Hr boosts ( Whether its was Via X10 or hard wired switches ) and the
orginal controller for timings. I have now moved all the timings to
Comfort
aswell - the orginal controller is still there but I've cleared all the
settings. I could remove it totally so long as I hard wired the HW-OFF
which
is currenlty provided 24x7 by the controller.

http://www.eatworms.org.uk/ha/heating.php

My wiring
http://www.eatworms.org.uk/ha/heating1.gif

I would echo Patrick's comments though - dont mess unless you know
absolutely what you're doing. CH failure is an absolute killer of WAF !

Dean


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