New Drayton RF601 Thermostat Too Sensitive?

getmore4less

Swap the old stat back it easy to do.

The spec says control is 0.5c(k).

Not sure what the under over an hours setting does it might change the hysteris.

getmore4less

While trying to get this working read up on the benefits of a programable stat.

If the one you bought is broken you can change.

Drayton do them that works with the receiver you have.
No need to call out your heating engineer.

M271

getmore4less wrote: »

Swap the old stat back it easy to do.

The spec says control is 0.5c(k).

Not sure what the under over an hours setting does it might change the hysteris.

Well the control on my new unit is far less than 0.5 degrees, maybe it's faulty.
When I email or phone Drayton if they confirm that it is not faulty or that it can't be adjusted in some way (like the hours one) then I will swop the old one back.

getmore4less

Why wait even if they say it is OK you don't like it

notbritishgas

M271 wrote: »

Interesting to hear from you the similarity of our experiences including the radiator temperatures. Maybe the temperature operating window for switching the heating on and off is tighter on the newest controls but my experience is that it is too sensitive (less than 0.1 degree)

It just doesn't seem right to me that the heating is firing up that frequently, my receiver unit won't last 11 years like the last one at this rate, let alone the other system components.
Did you have to re-pair your old thermostat to the new receiver or did it just recognise it?

Yes the old thermostat paired to the new receiver ok.

M271

I've just had a phone call from Drayton and they talked me through altering 2 installer settings and changed the Application Type from Gas to Oil (even though my boiler is Gas) and the System Capability from Fast to Slow. Apparently this should slow the frequency of cycling.
I'll monitor my system and see what difference it makes.

stator

Another possible thing to consider is the range of the wireless thermostat.
When the boiler turns off it could be because the signal from the thermostat isn't getting through.
Brand new batteries always worth a try when anything wireless is naughty

M271

stator wrote: »

Another possible thing to consider is the range of the wireless thermostat.
When the boiler turns off it could be because the signal from the thermostat isn't getting through.
Brand new batteries always worth a try when anything wireless is naughty

Thanks for your suggestion however this is a new unit with new batteries and I can see that the signal is being sent to the receiver.


I hope that my earlier Drayton instructed Thermostat adjustments help but early indications are not looking promising!

DavidFx

This is a feature of the thermostat - Drayton call it On/Off load conpensation


"On/Off load compensation is a feature of temperature control products such as room thermostats and programmable thermostats.On/Off load compensation is a proven method of minimising energy use by calculating the demand from a thermostat. As the temperature approaches the required setting, the boiler will fire for shorter periods of time, ensuring a constant temperature is maintained. This not only enhances comfort levels, but also uses less energy. On/Off load compensating products are ideal for use with modern systems in well-insulated houses."


It is a form of proportional control - by cycling the boiler, the circulating water temperature is reduced and the temperature control is improved. Without it, the room temperature will always overshoot the setpoint as the radiators will still be full of hot water and will continue to heat the room.

M271

DavidFx wrote: »

This is a feature of the thermostat - Drayton call it On/Off load conpensation


"On/Off load compensation is a feature of temperature control products such as room thermostats and programmable thermostats.On/Off load compensation is a proven method of minimising energy use by calculating the demand from a thermostat. As the temperature approaches the required setting, the boiler will fire for shorter periods of time, ensuring a constant temperature is maintained. This not only enhances comfort levels, but also uses less energy. On/Off load compensating products are ideal for use with modern systems in well-insulated houses."


It is a form of proportional control - by cycling the boiler, the circulating water temperature is reduced and the temperature control is improved. Without it, the room temperature will always overshoot the setpoint as the radiators will still be full of hot water and will continue to heat the room.

Thanks for the information looks like it is doing what it is supposed to do I guess it will take a bit of time to get used to. I'll see if the adjustments I made today have slowed the frequency of cycling a bit. Drayton didn't say what the difference would be just 'it will cycle less'.

I thought that the Thermostat was supposed to go on and then off in a 0.5 degree window but what is described in the load compensation explanation seems to be keeping it tighter than this. Last evening I could see my Thermostat calling for heat and then not every 4 to 6 minutes with not even a 0.1 degree change in a thermometer that I had next to the Thermostat (certainly not 0.5 degrees) but I suppose if the load compensation keeps temperatures that constant it is a good thing.

However it may be one of these energy 'green' devices which minimises fuel used and keeps a more constant temperature but at the expense of cycling boiler components, pump, thermostat receiver relay switch etc more and possibly shortening their life!? Hopefully not.