valves

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  1. T

    Relay wiring for motorised valves

    I have 2 motorised valves controlling 1 pump. Does anyone know how to wire relays(2) to avoid backfeeding All 230v thanks in advance.
  2. M

    Heat pumps: where to terminate motorised valves

    Hi, I’m just wondering has anyone on here any experience with a Mitsubishi Ecodan R32 model. I’ve completed all the wiring expect for terminating two motorised valves. I cannot find a manual stating what terminals they go into. Any help is really appreciated. Thanks
  3. timhoward

    2 port / mid position valves

    I've been wondering.... There are two estates of bungalows near me, all built together, all with traditional system boilers with tanks and cylinder. It seems to me that either the valve actuators work for many years, or on some properties they need regular replacement to the point I keep them in...
  4. P

    Combi boiler and zone valves help

    Hi chaps I’m wiring up a 2 zone heat system to a combi boiler. Do I need to replace the boiler mains cable with a 4 core cable and remove the link wire to s/L? I’m unsure how to run switch live from the zone valves and still keep the combi water side of it going? Any help would be appreciated
  5. B

    No zone valves on my system

    I have oil heat with 3 zones/3 thermostats (basement, 1st/2nd floor) using baseboards. The 3 thermostats are 110v line voltage units that operate the 3 circulator pumps. There are no zone valves on this system. I would like to install 3 Nest thermostats to replace these old line voltage units...
  6. G

    Megaflo Y plan problem

    Hi there, I have a Megaflow wired to spec here (bottom of p21), i.e. in a Y plan with additional 2-port valve. When CH is on and the stat switches to satisfied, heating sometimes stays on, sometimes switches off as commanded. I thought it might be the 3-port's head so replaced that; is it...
  7. A

    Bleed valves on electric towel rails

    Hi all could someone just clarify with me that there is no need for bleed valves on electric only element towel rads? Cheers
  8. C

    3 zone valves (underfloor, 1st floor rads, 2nd floor rads

    Hi, so I have 3 zone valves in place for my heating; 1 - for underfloor heating 2 - 1st floor heating 3 - 2nd floor heating for some reason the plumber has put a zone valve at the pump of the manifold. The 2nd floor has a missing room stat cable so will have to opt for a receiver for a...
  9. B

    Swapping from sz2301 to szm1801 valves

    Hi,new to this forum. I'm swapping from sz2301 valves to Szm1801 valves to see if there any better as the spring return ones only last a couple if years before either the micro switch or the motor gives up. Is the wiring the same as it looks slightly different. The brown and blue wires for the...
  10. D

    Protection and earthing of 24v ac circuit to energise solenoid valves

    Hi, I am tasked with switching some special FX kit we have over to 24v ac, from 12v dc. Purely to achieve longer cable runs with lesser volt drop. We have these transformers: link Which are bonded to earth and powered via a MCB and RCD (we work with water) protected feed, as with all our kit...
  11. Dave OCD

    Ariston E-Combi with 2 zone valves.

    I've managed to confuse myself a bit, I have to connect up the above boiler with 2 zone valves. Now the 'external controls' link is low voltage in the boiler and this is connected to the built in timeswitch for heating, I have 2x 2 port valves [upstairs/downstairs heating zones] and Honeywell...
  12. rolyberkin

    Circulation pump permanently on

    Can anyone help, I have looked at a central heating pump for my brother in law (who is a plumber!?:-) it is an HRM oil fired boiler, the problem is that the circulation pump is permanently on, there is underfloor heating with the system, the wiring is shocking and I will probably have to re wire...
  13. dlt27

    Underfloor heating help

    Hi, hope somebody can help. I am currently wiring a new wet underfloor heating system for builder. The plumber has fitted a 2 port valve and the pump that is part of the manifold. The existing system is a y plan. I was going to leave existing system how it is and fit a wireless programmable stat...
    • dlt27
    • Thread
    • boiler heating switch underfloor underfloor heating valve valves
    • Replies: 18
    • Forum: UK Electrical Forum
  14. G

    Combi boiler with dual heating zones and 2x programmable stats.

    First post so let me start by saying hello to all! I'm a plumber not an electrician, nor do I consider myself a heating engineer and would appreciate any help... What I have is a Worchester combination boiler which is currently hooked up to a Honeywell programmable room stat. We have...
    • GreasyWookie
    • Thread
    • boiler brown combi heating programmer stats valves zones
    • Replies: 19
    • Forum: Central Heating Systems
  15. sparks55

    Boiler help Potterton Osprey

    Potterton osprey fires up when programmer switched off and both stats isolated It's running through a Honeywell sundial wiring centre Can only turn off using mains switch
  16. Wilko

    A Day Plumb-Stumbling

    I've been having trouble with the monobloc kitchen sink tap - drip drip drip. Quarter turn ceramic disc type. I ignored it till sufficient badgering had been accumulated and thought I'd look into it. Take all rubbish out from under sink, turn off isolation valves. Both valves start dribbling out...
  17. 123

    Heating: Worcester Bosch Combi Greenstar With Zone Valves Wiring Diagram

    123 submitted a new resource: Heating: Worcester Bosch Combi Greenstar with zone valves Wiring Diagram - Heating: Worcester Bosch Combi Greenstar with zone valves Wiring Diagram Read more about this resource...
    • 123
    • Thread
    • bosch combi diagram heating valves wiring wiring diagram worcester
    • Replies: 0
    • Forum: UK Electrical Forum
  18. M

    Wiring A Bosch Combi Boiler

    Hi to all I need a bit of help please I hate wiring for heating but it's for my mate as the plumber hasn't sorted it Right he has got a new Bosch combi boiler and with that a linked in unvented cylinder I have no idea really how to wire it up and my mat has got both hives one for just combi...
    • michufc
    • Thread
    • boiler bosch combi thermostat valves wiring
    • Replies: 7
    • Forum: Central Heating Systems
  19. J

    For Sale: Festo Solenoid Valves

    I am selling some Festo Solenoid valves taken from a working panel, I have 17 in total and they all.come complete with LED indicator plugs and wiring. Part number is as followed: Festo CPE18-M1H-3GL-QS-10 Electric Solenoid Valve These retail at £100 brand new and so I will sell at £50 each...
  20. astormatt

    Pumps and Relays

    Hi all I am working on a job and I am having trouble getting my head around it. Normal systems are fine but this is causing me a headache. It is an S plan with an additional pump so both the DHW and CH have a pump and a valve, I know that the pumps have to be split due to it back feeding but...

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