First thing to make clear is am not an electrician or plumber. I would
really appreciate the advice being non-technical.

I have a central heating system with 2 Honeywell V4043H1C56 actuators.

The hot water one (nearest the immersion) is working fine but the
other which controls the hot water going to the rads sticks &
therefore needs to be replaced.

First thing to make clear is that it is old & therefore I am having to
replace the actuator & install the converter plate as it is not the
more recent all in one model. Therefore I do have to drain the system.

Problem & therefore advice I need concerns the wiring. The currently
fitted old model has 5 wires, the new model has 6, the most
noticeable difference being an extra white wire.

Wiring in the cupboard is as follows - Colour at the start of each
line is the one from the current actuator

1. Blue & a 2nd blue feeds into to wiring block with a Blue, Blue &
Black on the other side of the wiring block.

2. Grey & a 2nd grey feeds into a Blue & Brown on the other side

3. Green with yellow stripe & a 2nd Green with yellow stripe feeds
into 2 Green with yellow stripes on the other side

4.Red & a 2nd Red feeds into a Red on the other side

5.Black is joined together with one yellow wire


This leaves two questions for installation of the new actuator-----

Do I use the brown wire on the new actuator in the same way as the
black in the previous & what do I do with the white wire in the new
actuator ?

Many thanks for anyone who can give me help.

Neil

On Fri, 10 Aug 2007 07:48:26 -0700, in uk.d-i-y Neil DG
wrote:

First thing to make clear is am not an electrician or plumber. I would
really appreciate the advice being non-technical.

I have a central heating system with 2 Honeywell V4043H1C56 actuators.

The hot water one (nearest the immersion) is working fine but the
other which controls the hot water going to the rads sticks &
therefore needs to be replaced.

First thing to make clear is that it is old & therefore I am having to
replace the actuator & install the converter plate as it is not the
more recent all in one model. Therefore I do have to drain the system.

What do you mean by "the converter plate"?

Problem & therefore advice I need concerns the wiring. The currently
fitted old model has 5 wires, the new model has 6, the most
noticeable difference being an extra white wire.

You need to tell us ALL the differenced. The new presumably has an
orange, yes?

Wiring in the cupboard is as follows - Colour at the start of each
line is the one from the current actuator

1. Blue & a 2nd blue feeds into to wiring block with a Blue, Blue &
Black on the other side of the wiring block.

2. Grey & a 2nd grey feeds into a Blue & Brown on the other side

3. Green with yellow stripe & a 2nd Green with yellow stripe feeds
into 2 Green with yellow stripes on the other side

4.Red & a 2nd Red feeds into a Red on the other side

5.Black is joined together with one yellow wire


This leaves two questions for installation of the new actuator-----

Do I use the brown wire on the new actuator in the same way as the
black in the previous & what do I do with the white wire in the new
actuator ?

NO!!! Some years ago red and black were used for live and neutral
respectively, but are nowadays replaced by brown and blue. i.e. red
replaced by brown, black replaced by blue.

Your description is not clear enough to give real advice, but

The Honeywell site has relevent info at
http://content.honeywell.com/uk/homes/FAQ/2port.pdf

It says the white is only fitted to 28mm an 1" valves AND replacement
heads part no. 40003916-001, so you can leave it unconnected (but
insulated).

The FAQ has more details at
http://www.diyfaq.org.uk/plumbing/co.../controls.html

Phil