WMF 800 - 2;3.6.1 Steam Boiler with Temperature Sensor and Electrode (Level Sensor) T2-20

Engin eering
T2-20
© WMF800 / 900 / 1000S / 1000proS Edition 07/2014 - KMT
2/3.6.1 Steam boiler with temperature sensor and electrode (level sensor)
TheheatisswitchedusinganSSR(Solid-
StateRelay).Thetemperatureismeasured
withanNTCresistor.
Thesteamboilerisprotectedbythe
followingsafetysystemsagainst
overheatingandbursting:
• Thetemperaturesensorswitchesthe
heatingelementonandoffdepending
uponthesteamtemperature.
• Thesafetythermostatinterrupts
theheatingcircuitifthesurface
temperatureofthesteamboilerexceeds
155°C.
• Thesafetyvalveopensat16barand
ventsanyexcesspressure.
Bothheatingelements(hotwaterandsteamboiler)disableeachother.Ifthereis
achangeinheatingcontrol,thereisapause(icker).Thesteamboilerisinsulatedso
thataslittleheatenergyaspossibleislost.
Technical data: steam boiler system
Steam boiler
Steamboilervolume 0.35litres
Volumetotheelectrode
Heating element
Heatingcapacity/voltage/
powerconsumption
Standard:1kW/230V Purchaser-suppliedfuse:at
least10A
Desiredtemperature 130°C
Safety valve
16bar Seesteamboilersafety
valvechapter.
Testpressure (2.4MPa)
Temperature sensor
ResistanceatNTCat20°C about12.500ohms
ResistanceatNTCat95°C about800ohms
ResistanceatNTCat125°C about350ohms
Service life for the steam boiler and temperature sensor
Maximum6years After6years,thesteamboilermustbereplacedfor
safetyreasons.
Descalingmayonlybeperformedwiththedescalingprogramandwiththeintended
descaler.
Fundamental temperature controls:
Ifbelowthedesiredtemperature,theheatturnsonuntilthedesiredtemperatureis
reached.
See safety valve chapter 2/3.5.3