safety thermostat on eabearpasher

[albert]

allo ray do you have some tech.information for the over heating safety thermostat (the round thermo couple ) at 5 inch from glowplug , this thermostat make short cicuit on the fuse for to stop the heather on the overheat , on my car it is burn (deffective) he stay n.o , for my test , i put the thermostat on my stove élément (red) and i year the click but inside the contact stay off , and i make good clining on and i see this no. exact reproduction,,,,,(..... (10-63) 250-1200....) i dnt,know if my déduction are good ,,(10-63) month and year of production and 250-1200 (for me it is for temp. ,,degrées fr. my question is 250,d,f. i axept that,, but 1200 i thing, that is to hi before short circuit , the air heather hose take a fire ,for me the good temp. before short-circuit is 250-350or400degr.fr. ,,,,,my question is, have you more information on that, i need the exact degrées f. for to change that, for to find that not a problem, i have 100 with différent degrées ,,, big thanks for your help,,,,

[raygreenwood]

From memory, the overheat...or high limit switch, is supposed to break circuit at just over 500F. I have never had it actually turn off the heater because there was an overheat. The two main things that actually cause this switch to function....or the heater to overheat, are large clogs in the cooling air fan flow to the heater, or grossly too high fuel flow.

There is one more problem. This switch looks like a small disk. It has a drimped connector at each side. If those connectors are bent somewhat, the underside of the rolled connector crimp, will contact the metal of the body on the disc of the switch. It may be naked to the eye. But...it will cause the switch to short. If you follow the green wires down to the inline fuse...and to the black safety switch...those are the two parts that keep tripping when the high limit switch is shorted. Ray

[albert]

thanks ,,ray for tech,inf. you are ok for the disk but on mine the 2 wire have rubber for insulation and he is solder on the contact , the rubber is good , close at the perfection the combustion room , i try wat you said , and i do the test by 250d, and i going more up afther to 500d.f. thanks ,,albert

[raygreenwood]

Yes,i have one like that also, The rubber cover is very nice, and the two terminals are soldered on. But they can have the same problem. Be very careful in inspecting the places where the solder is. If either termina lmakes contact to the body of the switch, it can cause a short.
It is also possible to replace this switch with a fusible link. It is just an emergency device....important..yes! But exceedingly rare to be used...except on systems that have been allowed to fall in disrepair or age. With a fusible link, you will have to rewire the system to make this a ground breaker for the black safety reset switch...instea of a current line. Ray

[albert]

thanks ray for attention ,,, for the contact , i replace ,the thermostat by new one not from vw ,, you ar elect.ing. you know what i speak ,,, on my daylay job i use same model of this clixon safety thermostat , the utilisation of that is ,,,(fournas burner with oil or électric and at your home on the home dryer we have lot of différent degrées and they have same dimention except the 2or 4 contact are slut contact in that you can buy ( single pole single troow or dl.dt. ) or with heating élément inside ) 100 application at 10.$

[albert]

ops,,,ps ,, i put same model on my 412 for to replace cold start thermostat for cold start valve and at(-30 d.f. ) he start at 1/4 rpm i use the model for 32d.f.,,, normal close at 32 ,,,,(at your choyse ) 40 deg. is good to