whats the max/min temp differential allowed

before calling a mechanic thermostat deffective?

i have one that set at 40ºF will keep the unit working till 32ºF and will start back at 70ºF

I'm sure that is not normal so i opened the thermostat and everything seems to be ok.
i checked it was placed, exactly in the same place and way before unmounting it and the conections are correct.

it's a danfoss thermostat like one of these...

http://www.drillspot.com/pimages/433/43352_300.jpg



sorry if you find this post irrelevant but i could use a hint as to if these can be recalibtated or disposed for new ones.

thanks in advance

2 to 3 K is normal termostat differential for air conditioning applications.
For particular termostat you should found its technical literature, since differential depend on his usage field.

Apart from changing to an electronic control, Eliwell, Dixell etc., is the sensing bulb in good contact to the fluid being sensed?

If it worked before and now doesn't, technicaly its broked and needs a new one.

ok so either the thermostat is broken (because it does not work as it used to) or I reinstalled the temperature bulb incorrectly.

the thermostat as nike ponts out has a 3K differential and i placed the copper bullet at the air return side of the evaporator coil, where i found it in the first place, where should i place the temperature bulb to get the accurate measuring and prevent extended runtimes?

thanks

hi frostedflake, I seam to remember somthing about setting up the stat < file < it has to point downwards or the alchol or liquid inside the <file< migrates along the cappilary making the stat uncontrolable, also I remember there is a manual setting to give a max + min temp range,

thanks for the help