Does anyone know the output voltage from the boiler to the Worcester Wave

[StuartB4]

Just wondered if anyone would know this.
I just had a Worcester Greenstar 30i installed with the Wave Smart Thermostat system.
The thing is it's not working, boiler is working fine but the Wave is not, no display or anything. The engineer said it's all connected correctly.
I've checked the voltage going to the Wave wall plate from the boiler and it's only 4.89 volts AC.
I assume it should be AC as it's not a polarised voltage and is converted to DC inside the Wave with a bridge rectifier or at least rectifier diodes.

I have a feeling the voltage is not high enough because I've seen a picture from the Wave manual that says the supply voltage is 14.3 to 16 Volts DC. Picture below.
Thanks for any ideas you may have.

 

[picasso]

it should be 15vdc connected to the ems bus connection in the boiler.

 

[bernardgreen]

I assume it should be AC as it's not a polarised voltage

It is a DC voltage that is always greater than 9 volts. This is regulated down to provide a 5 volts supply ( or maybe 3.3 volt ) to the thermostat.

Data is sent from the boiler by varying the voltage between 10 volts ( logic 0 ) and 14 volts ( logic 1 )

Data is sent from the thermostat by the thermostat varying the current it takes from the supply by connecting a 200 ohm ( typical ) resistor across the supply.

A bridge rectifier is fitted to allow the system to be polarity independent. Original design of the system was polarised but adding the bridge allowed for the system to tolerate errors in wiring that reversed the polarity without causing damage.

 

[picasso]

Wave uses wifi to send data to the boiler, the bus connection is power only.

 

[bernardgreen]

Wave uses wifi to send data to the boiler, the bus connection is power only.

Seems an awful waste of the EMS bus data facility if it has been reduced to being nothing more than a power supply.

Might be worth checking if the data from thermostat to boiler really does go via a WiFi link.

 

[StuartB4]

Wow that was quick and really helpful.
Thankyou all very much.
I'm not going to mess with it because the engineer said he will be back next week.
I just like to know whats going on when things dont work, especially when they are brand new.
Thanks again.

 

[picasso]

Might be worth checking if the data from thermostat to boiler really does go via a WiFi link.

Yes because maybe I cant read properly.....

 

[jedi]

Wave uses wifi to send data to the boiler, the bus connection is power only.

What a load of sh!te.....

Are you a professional?

 

[jedi]

Wow that was quick and really helpful.
Thankyou all very much.
I'm not going to mess with it because the engineer said he will be back next week.
I just like to know whats going on when things dont work, especially when they are brand new.
Thanks again.

If the wave never powered up then it wasn't fitted properly and he done a runner....he probably wired it to the standard stat connection...Thick tw@t..

 

[jedi]

Yes because maybe I cant read properly.....

View attachment 137167

You can't. ..

 

[Dan Robinson]

Bell end.

 

[picasso]

If I make a mistake I put my hands up.

 

[picasso]

After a bit more digging I was wrong and jedi was right to pull me up on it, the wave uses the 2 wire to communicate with the boiler, I (wrongly) assumed it was the same idea as the nest should have put a bit more thought into it.

 

[bernardgreen]

.

Amazing. the thermostat knows that it must connect to the boiler but not until after the plastic screen protector has been removed.

 

[jedi]

Bell end.

Are your speciality. ...you still sucking on em?