WMF 800 - 2;3.5.1 Hot Water Boiler and Temperature Sensor T2-12

Engin eering
T2-12
© WMF800 / 900 / 1000S / 1000proS Edition 07/2014 - KMT
2/3.5.1 Hot water boiler and temperature sensor
TheheatisswitchedusinganSSR
(Solid-StateRelay).Thereleasevalve
isswitchedoneverytimetheheater
isswitchedon,howevernotduring
beveragedispensingorwhensupplying
thesteamboiler.Thetemperatureis
measuredwithanNTCresistor.
Thehotwaterboilerisprotectedby
thefollowingsafetysystemsagainst
overheatingandbursting:
• Thetemperaturesensorswitchesthe
heateronandoffdependingupon
thewatertemperature
• Thesafetythermostatinterrupts
theheatingcircuitifthesurface
temperatureofthehotwaterboiler
exceeds130°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hotwaterboilerisinsulated
sothataslittleheatenergyaspossibleislost.
Technical data: hot water boiler
Heatingcapacity/voltage/
powerconsumption
Standard:1kW/230V/4.3A Purchaser-supplied
fuse:atleast10A
Hotwaterboilervolume about0.35liters
Pureheatingtimetoheat
from20°Cto89°C
<2minutes
Operatingtemperature 86°C-102°C Customersetting:
60°C-95°C
Operatingpressure 12bar/maximum14bar
Testpressure 14bar
Technical data: safety valve
16bar Seehotwaterboiler
safetyvalvechapter.
Technical data: temperature sensor (NTC)
Resistanceat20°C about12.500ohms
Resistanceat80°C about1.200ohms
Resistanceat90°C about900ohms
Service life: hot water boiler and temperature sensor
maximum6years After6years,thehotwaterboilermustbereplaced
forsafetyreasons.
Descalingmayonlybeperformedwiththedescalingprogramandwiththeintended
descaler.