Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Theromstat Spec
Thanks to advice from this group I have successfully fitted a room
thermostat to my central heating system. I noticed however on reading the spec sheet that came with the unit (Drayton Digistat 1) that there is a spec for "Differential 0.6 degrees c at 4 degrees c per hour" just curious to know what this means if anyone knows? Thanks Marc |
#2
|
|||
|
|||
Theromstat Spec
I noticed however on reading the spec sheet that came with the unit
(Drayton Digistat 1) that there is a spec for "Differential 0.6 degrees c at 4 degrees c per hour" just curious to know what this means if anyone knows? My guess is that the hysteresis is set for 0.6 degrees, provided that the temperature changes at or below 1C per 15 minutes. I may be wrong. Christian. |
#3
|
|||
|
|||
Theromstat Spec
"Marc Jennings" wrote in message ... Thanks to advice from this group I have successfully fitted a room thermostat to my central heating system. I noticed however on reading the spec sheet that came with the unit (Drayton Digistat 1) that there is a spec for "Differential 0.6 degrees c at 4 degrees c per hour" just curious to know what this means if anyone knows? Thanks Marc I can only guess! The differential is the amount of in-built hysteresis - i.e. the difference in temperature between opening and closing. This is less than 0.6 deg C. For example, if the stat opens at 20 degC, the room would have to cool to something approaching 19.4 degC before it would close again. The 4 degC per hour bit seems to be referring to the rate at which the room temperature is changing. It seems to suggest that the differential is 0.6 at a rate of 4 deg/Hr - but may be different at a different room temperature change rate (for reasons which are not immediately apparent to me!). Maybe someone who knows about these things rather than guessing can explain this better? Roger |
#4
|
|||
|
|||
Theromstat Spec
In article , Marc Jennings
writes Thanks to advice from this group I have successfully fitted a room thermostat to my central heating system. I noticed however on reading the spec sheet that came with the unit (Drayton Digistat 1) that there is a spec for "Differential 0.6 degrees c at 4 degrees c per hour" just curious to know what this means if anyone knows? They're telling you the conditions of the test: The chamber in which the thermostat was tested was heated at a rate of 4 degrees per hour until the thermostat switched (off) and the temperature was recorded, the room was (perhaps heated further) then cooled at a rate of 4 degrees per hour until the thermostat switched again (on) and the temperature was recorded. The difference between the two temperatures was less than 0.6 degrees. At a higher or lower rate of change temperature the thermostat may behave differently, eg. at a high rate of change the differential may be lower, or at a lower rate of change, the differential may be higher - or vice versa. HTH -- fred |
#5
|
|||
|
|||
Theromstat Spec
Marc Jennings wrote:
Thanks to advice from this group I have successfully fitted a room thermostat to my central heating system. I noticed however on reading the spec sheet that came with the unit (Drayton Digistat 1) that there is a spec for "Differential 0.6 degrees c at 4 degrees c per hour" just curious to know what this means if anyone knows? Thanks Marc A thermostat with a very low hysteresis and a quick response can cause the boiler to short cycle. In the one I have there is a switch inside to limit the number of boiler cycles per hour.. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Power Shower Spec | UK diy | |||
Battery Voltage spec | UK diy |