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relay
A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.
Relays are used where it is necessary to control a circuit by an independent low-power signal, or where several circuits must be controlled by one signal. Relays were first used in long-distance telegraph circuits as signal repeaters: they refresh the signal coming in from one circuit by transmitting it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
The traditional form of a relay uses an electromagnet to close or open the contacts, but other operating principles have been invented, such as in solid-state relays which use semiconductor properties for control without relying on moving parts. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called protective relays.
Latching relays require only a single pulse of control power to operate the switch persistently. Another pulse applied to a second set of control terminals, or a pulse with opposite polarity, resets the switch, while repeated pulses of the same kind have no effects. Magnetic latching relays are useful in applications when interrupted power should not affect the circuits that the relay is controlling.
Hi guys. Just bench testing my wiring centre. It all performs as it should but the relay makes a bit of a racket while it's waiting for the valves to open before it calls for heat. Only does it on a UFH zone, if using the rad zone its silent as I guess as it's not delaying/activating the pump...
Hi there thanks for your time to look at this.
I've got a multi pump / circuit system which is connected via a relay box to the boiler and Honeywell timer programmers. Picture attached.
Right now any single circuit can turn the boiler on an off at any time (assuming the programmers allow it)...
I had an electric boiler installed recently which required the boiler to be inhibited by an electric shower. The proposed installer wanted to use a Heatrae Sadia Relay RL1. I stopped this, as an electrical engineer this unit is NOT complaint to electrical regs unless the cables to the fuse...
I have now established that my boiler, a Baxi Potterton Performa 30 HE will only work in relay (on/off) mode.
Looking at the wiring diagram below, which terminals would I connect to the new version of the extension box? Tado won't tell me. When I installed my first Tado system on an older...
Hi all, we have a house with solid stone walls with a combi boiler serving it from a block built outbuilding next door.
Currently there's a Siemens RDJ10 thermostat in the hall which is not much good as the temperature is very different in the open plan kitchen diner.
I was thinking of...
When I run TT through the relay no heat activation. When I by pass relay to a single thermostat works as intended. Triple checked wiring seems correct.
Hi,
I need to connect 2 X 2 port valves to my boiler via a 10 way junction box.
My boiler needs a zero volt switch line so I think I need to install a relay, in series, between terminal 9, coming from the valves, to the boiler.
Any ideas what I need or when to get 1?
Cheers,
Keith.
It appears my heating system is throwing a wobbly; I have a system boiler set-up (Ideal Standard ... I think, can check), hot water works fine but the heating is problematic.
When I adjusting the thermostat (Drayton RTS8, running on 24vdc) to kick the heating in to life results in relay chatter...
Hi.
CM927 Wireless programmable Thermostat and Relay box were fitet in my house Sept. 2008.
Now the CM927 seems to misbehave, If I buy a replacement CM927 will it work with the existing Relay box?
Glowworm Ultimate 50FF + 2x Danfoss HPA2 valves for CH and HW.
Pressurised system. No frost stat and wiring (S-plan – I think) has been OKd by two separate engineers.
At the end of the day, the pump is not switching off when boiler/CH/HW shut down.
After the 6-7 minute pump overrun, the levers...
Hi,
My Honeywell HCW80 relay unit is not lighting up at all when I press or hold the button. I believe this fault is causing my central heating to have stopped. Looking behind the cover, things look fine, but I'm no expert. What would be the best course of action here?
Picture of the relay unit...
Hi all.
Got a Hive install where the HW works fine, however the CH isn't. Currently the CH seems to be switched on via this Honeywell relay that's in the airing cupboard.
Anyone know how to wire this thing up? I'm guessing the relay needs to be removed, and the HW on from the Hive needs to be...
Hi
I am fitting a Heat only boiler that just serves the radiator circuit, the boiler has its own dedicated block terminal connector on the PCB but I cannot connect the pump to it as we normally do, the pump is a commercial type and Worcester Bosch have stated it will damage the PCB because of...
Hello,
Would be great if someone could help me.
Our Oil Warmflow combi boiler UP90HE has started playing up. It has a built in timer(TM-0521 or TM-0522) which allows manual operation of the hot water and heating.
If i manually turn the hot water on, the boiler ignites when a hot tap is...
sym0n
Thread
click
combi
heating
ignition
oil
relay
warmflow
without
Does anyone have a Citroen relay van with a history of problems starting?
I have a 2007 2.2hdi model and recently it has been an bit of a pain when starting.
Not all the time and not always the same thing!
Some times the key fob does not work/several presses of the button to open door.
When key...
I need to install a relay for the cylinder element in the electrics from my solar heating control panel. Can anyone recommend one of the relays available from Screwfix?
Hi one and all,
I have a Worcester Bosch 28CDi Compact Combi Boiler, which was newly installed 2 months ago.
It replaced my old Alpha CB33HE Boiler. I had a Honeywell ST6100A Timer, which I replaced with
a Honeywell ST9100A Timer, just to update the system. I have a Danfoss RMT230 mechanical...
Can anyone tell me what the purpose of the Drayton Flowshare Relay RB2 is?
I was called to a property today only to find that there's no power from said relay to the boiler and as I can't find one at a decent price I'd like to remove it but I'm not too sure if it's practical to do so?
Hello all,
I've recently changed an old pump, and the mentioned diverter valve. However I notice the wires are a different colour to the new Drayton valve, though both have 5 wires.
does any body know what old wires correlate to the new ones, and if it's just as simple as I'm hoping to change...
shudzeye
Thread
3 port
3 port valve
centre
drayton
relay
valve
wiring
Hi wondering if anyone can point me in right direction - I will get in a pro if needed but want to rule out easy fixes first before being hqmmered with a call out charge for nothing.
I have a worcester greenstar 28i boiler installed, servicing up to date installed around 3-4 years ago never...
jbrown83
Thread
greenstar
hot
hot water
light
relay
thermostat
water
worcester
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