C Plan

[Falcon22]

Have just bought a Honeywell 2 port valve (V4043H1056) to use in a 'C' plan system - the plan shows 6 wires from valve Grey, Blue, G/Yellow, Brown, White, Orange, mine has 5 wires (no White). Can anyone let me know the correct way to wire the 'C' plan using 5 wires (Grey, Blue, G/Yellow, Brown and Orange)
Thanks

 

[DP]

You have purchased a 22mm valve. 28 has six wires. Gravity runs are 28mm.

 

[Falcon22]

Thanks for the reply, there is a 22mm leaking valve already in the system, I thought straight replacement, should of known nothing is simple - I think the 22mm valve will be heading E-Bay's way!!

 

[seco services]

what part number is on the part thats leaking ?

 

[grahamderek]

3 port valve has 6 wires, 2 port has 5.
you are looking at the wrong wiring diagram

 

[seco services]

3 ports have 5 wires same as a 2 port zone valve.

 

[Falcon22]

Cant read the part number its covered in rust, have spoken with 2 plumbing merchants and they both confirmed that the 28mm valve (V4043H1106) does have 6 wires. I will let you know tomorrow when it arrives.
The original 22mm valve had 5 wires but was wired to a home made control unit which has to be seen to be believed it has now been consigned to the bin.

 

[seco services]

yes the v4043h1106 does have 6 wires designed for a c plan.

http://content.honeywell.com/uk/homes/systems.htm

 

[grahamderek]

The V4043H1106 is only suitable for gravity DHW, not to be confused with the normal 28mm 2 port valve, which is the same as the 22mm. Normal 2 port valves have 4 core (+earth), normal 3 port valves have 5 core (+earth). Then you get preference valves just to confuse the issue.

Just read your original post again, if you do have a C plan system, you do need the V4043H1106, and not the one you bought

 

[seco services]

where do you keep getting the info of 3 port valves have 5 wires + earth.
5 wires in total grey, blue, orange, white, earth.

 

[grahamderek]

Oops, sorry. I'm thinking of the older models which did have a total of 6 wires. Will try and look up what makes, just for interest.
(must pay attention!)

 

[seco services]

 

[grahamderek]

Right, I'm back home and back in this century.
It was of course the original Honeywell 3 port that had 6 wires, replaced in the 70s(?).
No I'm not having drug flashbacks, I've got a better excuse.
I'm cat sitting this week, this means
A. lots of time sitting in front of a computer
B. 4 sets of needles gently working deeper towards my vital organs because she doesn't like anything less than 100% attention. This does reduce my concentration.
Sorry for misleading everyone.
SECO SERVICES 1
GRAHAMDEREK -50
CAT 999

 

[DP]

28mm valves were often used to control gravity loops to cylinder. As such they needed six wires- brown, blue, green-yellow, orange, grey and white.

Maybe i am living in a different dimension but have yet to see a 5 wire core cable on a head that carries earth wire. You can get 6 cores on a replacement Honeywell actuator that will fit 22mm valve. Been there and done it.

OP do find out which three port valve fitted to your system. Some systems were fitted with a diverter valve (HW priority) as opposed to midposition valve.

 

[paulybaby]

c plan 2 port valve uses white wire to feed live via orange wire to boiler on when 2 port closed. ie earth blue grey brown orange white. 6 cores. 4043h replacement powerheads have white which is made safe on s plan