A DIY & home improvement forum. DIYbanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » DIYbanter forum » Do - it - Yourself » UK diy
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

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.

Central Heating - Problem with 3 way valve wiring.



 
 
LinkBack Thread Tools Display Modes
  #1  
Old October 3rd 03, 02:02 PM
John
external usenet poster
 
Posts: n/a
Default Central Heating - Problem with 3 way valve wiring.

Got a fully pumped system, with cylinder thermostat and 3 way valve (no
room therm)

HW seems to work OK - Heats up, cylinder themostat cuts off and boiler/pump
switch off.

However have got problem with valve (or rather the way it has been wiring!)

When HW & CH are selected (programmer only allows HW only or CH&HW) valve
remains in B position (HW only), boiler and pump power up and tank heats.
When the tank reaches temp the thermostat switches off.

At this point the motor powers up and moves to the AB position, the
microswitch is activated and the motor stalls in the AB position, The boiler
and pump however dont run and so the heating is in the off state.

If I manually slide the lever on the 3way valve over to the A position
(heating) then the boiler and pump switch on again

Which wires are connected incorrectly?

Any suggestions?


Ads
  #2  
Old October 3rd 03, 06:28 PM
Roger Mills
external usenet poster
 
Posts: n/a
Default Central Heating - Problem with 3 way valve wiring.


"John" wrote in message
...
Got a fully pumped system, with cylinder thermostat and 3 way valve (no
room therm)

HW seems to work OK - Heats up, cylinder themostat cuts off and

boiler/pump
switch off.

However have got problem with valve (or rather the way it has been

wiring!)

When HW & CH are selected (programmer only allows HW only or CH&HW) valve
remains in B position (HW only), boiler and pump power up and tank heats.
When the tank reaches temp the thermostat switches off.

At this point the motor powers up and moves to the AB position, the
microswitch is activated and the motor stalls in the AB position, The

boiler
and pump however dont run and so the heating is in the off state.

If I manually slide the lever on the 3way valve over to the A position
(heating) then the boiler and pump switch on again

Which wires are connected incorrectly?

Any suggestions?



Have a look at http://content.honeywell.com/uk/homes/systems.htm and scroll
down to the wiring diagram for a Y-plan system.

Yours should be like this, except for replacing the room stat with a link
between 4 and 5 in the 10-way junction box.

The most likely candidates are either a missing live feed for Hot Water OFF
from the programmer to terminal 7, or one of the connections to the cylinder
stat missing. The grey wire to the 3-position valve *must* have a live feed
when hot water is off or satisfied - otherwise the whole thing won't work.

Roger


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Central Heating Motorised Valve xtinexoop UK diy 9 October 3rd 03 11:33 AM
Central Heating problem - 2A fuse blowing in honeywell wiring box Andy Hall UK diy 9 September 30th 03 09:29 PM
Central heating wiring Paul Roman UK diy 10 August 30th 03 02:20 PM
Further to my last post entitled 'Flushing and treating central heating question' David W.E. Roberts UK diy 0 July 29th 03 07:15 PM
HONEYWELL CENTRAL HEATING VALVE V4043H tc3man1 UK diy 2 July 22nd 03 03:31 PM


All times are GMT +1. The time now is 02:02 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.SEO by vBSEO ©2010, Crawlability, Inc.
Copyright 2004-2014 DIYbanter.
The comments are property of their posters.