How to re-programme a Drayton wireless thermostat?
Feb 23, 2009 by Tealeaf | Posted in Maintenance & Repairs
I have a Drayton RF2 Wireless thermostat, and for some reason the screen went blank yesterday. It has come back on now but I need to re-programme it and dont have a manual. The screen reads 34c and wont change- I can change the time but nothig else. Any
Once you chang the batteries it should find the boiler receiver automatically. if this doesn't work then put Drayton and the model no. into Google and you can down load the Information for setting up the RF. connection.
Telmah | Feb 26, 2009
More thoughts on Boiler Hacking
At the weekend the house was cold so I measured the time taken for the boiler to get the house back up to temperature. Now that it's hovering around the set point on the thermostat, I'm monitoring how long the boiler cycle periods are, and see if I can reduce the cycling by direct manipulation of the water temperature control pot. I've also discovered a subtlety about my Drayton Digistat wireless thermostat. In order to save battery life, it restricts the sending of messages to every 4 minutes. So if the thermistor in the thermostat reaches temperature, the boiler off command is only sent when the next message is scheduled. The timing of these messages is probably derived from a 1 second interrupt from a real time clock routine running of a 32kHz watch crystal. The effect of this is that the boiler appears to turn on and off, exactly synchronised to the seconds counter of my PC clock - i.e. all on and off activity appears to be when it's 32 seconds past the minute. The Worcester Bosh Greenstar boiler, has a 2 minute start up sequence. If the boiler is cycling on and off every 20 minutes, it means that it goes through 3 start-ups per hour. If it is possible to reduce the number of start-ups and the cycling, then some of the wasteful start-up period would be removed and the heating would be more efficient. It would also be advantageous to introduce some hysteresis into the thermostat control. Although the set point might be 19C, the user is not going to notice if you turn the boiler off at 20.0C and back on again at 18.0C. The boiler will have a longer runtime, and less time will be spent repeatedly reheating the pipes and radiators. By way of some figures. Yesterday morning was about 1C outside. When the boiler came on at 4:30am it took 3hrs 30 mins to raise the room temperature by 3 degrees, and in the process used 46kWH of gas (ВЈ1.50 worth) and the room was still chilly. The boiler was restarted at 1pm and then only used a further 130kWh to keep the...
