WMF 800 - 2;3.5.3 Hot Water Boiler Safety Valve T2-14

Engin eering
T2-14
© WMF800 / 900 / 1000S / 1000proS Edition 07/2014 - KMT
2/3.5.2 Thermostat
Thetemperaturelimiterspreventthe
boilertemperaturefromincreasingtoo
muchinthecaseofamalfunction.If
thecut-offtemperatureisexceeded,
thecontactsopenandarelocked.
Ifthereisaleak,theprotectivecovers
preventshort-circuits.
Theservicetechnicianisprotected
fromaccidentalcontactandpossible
electrocution.
Technical data: thermostat
Shut-offtemperature +130°C±6.5K correspondstoabout
3-3.5bar
Technician instructions
Aftercoolingdown,thecontactcanbeclosedagainbypressingtheresetbutton.
Thetemperaturelimitermaybescrewedinwithamaximumof100Ncm(proper
hand-tightening).
Ifyoutightenthetemperaturelimitermore,youwillstripthethreads.Thesensor
wouldthennotmakecontactcorrectlyandasaconsequenceitnolongertripsdue
toanovertemperaturecondition!
Ifthereismechanicaldamageorevidenceofcorrosion,thetemperaturesensormust
bereplacedforsafetyreasons.
Possible errors
• Trippingofthetemperaturelimitercanbetracedtofaultslistedinthehotwater
boilerchapter
2/3.5.3 Hot water boiler safety valve
Thesafetyvalvepreventsan
unallowedincreaseinpressureinthe
boilerduetofaults.
Technical data: safety valve
Openingpressure 16bar(1.6MPa)
Service life: safety valve
2years After2years,thesafetyvalvemustbereplacedfor
safetyreasons
See hot water boiler in chapter 2/3.5.4.2