CAUTION
Safety features such as frost protection monitoring and excess temperature protection are not
active in the following cases:
•
Defective heating controller and failure of its functions
•
Sensors are faulty, not connected or have not been deactivated
•
No power supply to the controller
•
Mode switch set to manual operation
1.2 Sensor resistance values
Resistance thermometer with PTC measuring element
Sensors for outdoor temperature Type 5224, for flow and return flow temperature Types 5264
and 5265, for storage tank temperature Type 5264, sensor for room temperature with remote
control Type 5244
°C 20 10 0 +10 +20 +25 +30 +40 +50 +60 +70 +80 +90 +100 +110 +120
Ohm 694 757 825 896 971 1010 1050 1132 1219 1309 1402 1500 1601 1706 1815 1925
Room temperature
sensor with remote
control Type 5244
Switch position "clock", terminals 1 and 2 °C +10 +15 +20 +25 +30
Ohm 679 699 720 741 762
Resistance thermometer with Pt 100 measuring element
Sensors for outdoor temperature Type 5225, for flow and return flow temperature Types 5204
and 5205-47, for storage tank temperature Types 5205-46 and 5205-48, sensor for room tem-
perature Type 5255
°C -35 -30 -25 -20 -15 -10 -5 0 5 10
Ohm 86.25 88.22 90.19 92.16 94.12 96.09 98.04 100.00 101.95 103.90
°C15202530354045505560
Ohm 105.85 107.79 109.73 111.67 113.61 115.54 117.47 119.40 121.32 123.24
°C 65 70 75 80 85 90 95 100 105 110
Ohm 125.16 127.07 128.98 130.89 132.80 134.70 136.60 138.50 140.39 142.29
°C 115 120 125 130 135 140 145 150
Ohm 144.17 146.06 147.94 149.82 151.70 153.58 155.45 157.31
Resistance values with Pt1000 measuring element
Use the resistance values in the table for the Pt100 and multiply the values by the factor of 10.
Sensor for outdoor temperature Type 5227, for flow and return flow temperature Types 5207-
21, 5207-27, 5277 (thermowells required) and Type 5267 (surface sensor),
for storage tank temperature Type 5207-46 and Type 5207-48,
sensor for room temperature Type 5257-1,
room temperature sensor with remote control Type 5257-4.
6
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