20 Electrical connection - Boiler
ST1: O
2
-sensor
ST2: Flue gas sensor AGF1500/ Pt100
ST3: Boiler- and STB-sensor (KF+STB2000)
ST5: Boiler-return sensor F3 Pt2000
KL1: STB-sensor Pt2000 (blue/red)
KL2: STB-sensor Pt2000 (blue/white)
KL3: Boiler sensor Pt2000 (white)
KL4: Boiler sensor Pt2000 (red)
T = 0°C R = 2000.0Ω
T = 20°C R = 2155.9Ω
T = 80°C R = 2617.9Ω
Please, be mindful of the right connection.
Note:
Double element sensor (2xPt2000)
Push the boiler- and STB-sensor (KF+STB2000) by means
of coupling spring and heat conducting paste completely
in the boiler immersion sleeve and protect it with a
retaining clamp against unintentional pulling out.
Do not extend the connection cables of the boiler- and
STB-sensor.
KL1: Boiler return sensor F3
KL2: Boiler return sensor F3
T = 0°C R = 2000.0Ω
T = 20°C R = 2155.9Ω
T = 80°C R = 2617.9Ω
Push the return sensor by means of coupling spring and
heat conducting paste completely in the boiler immersion
sleeve and protect it with a retaining clamp against
unintentional pulling out.
Either a UF2000- or a UFL2000-sensor can be used.
Alternatively this sensor can also be used as a contact
sensor KAF2000.
Connect O
2
-sensor.
Do not extend the connection cable.
The O
2
-sensor case and the boiler jacket cannot have an
electric connection.
Pay attention to density.
Before initial commissioning of the system, carry out an
“O
2
-calibration”.
Do not fix the sensor with silicone.
If the sensor is glued, use temperature-resistant, non-
evaporating adhesive.
KL1: Signal – (grey)
KL2: Signal + (black)
KL3: Heater 12V~ (white)
KL4: Heater 12V~ (white)
Heater: Equal polarity
KL1: Flue gas sensor AGF1500/ Pt100
KL2: Flue gas sensor AGF1500/ Pt100
T = 0°C R = 100.0Ω
T = 20°C R = 107.8Ω
T = 100°C R = 138.5Ω
T = 200°C R = 175.8Ω
Equal polarity
Use a bayonet cap to fix the flue gas sensor on to the flue
gas pipe.
Do not extent the connection cable of the flue gas sensor.
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