Bosch ZWB24-1AR Series - Electrical Datas

26 | Failures / Errors
3.5 Electrical Datas
Description Supply Voltage Value Tolerance Remarks
Termperature Limiter
Pramiary HE
24 VDC 0 Ohm - Temp. Limit = 110 ºC
Termperature Limiter
(Recuperator-Flue gas)
24 VDC 0 Ohm - Temp. Limit = 100 ºC
DHW Temp. Sensor (NTC) 5 VDC 20 ºC => 12,4 kOhm
60 ºC => 2,5 kOhm
± 0,5 kOhm --
Flow Temp. Sensor (NTC) 5 VDC 20 ºC => 14,8 kOhm
60 ºC => 3,2 kOhm
± 0,5 kOhm see resistance table
Flue gas safety (Combus-
tion chamber ) Sensor
(NTC, behind burner)
5 VDC 20 ºC => 12,1 kOhm
60 ºC => 2,9 kOhm
± 0,5 kOhm ---
Pump 230 VAC I = 495 Ohm
II = 355 Ohm
III = 220 Ohm
± 10 Ohm ---
Ionisation Electrode -- ca. 3 - 5 µA -
Gas Safety Valve 1 230 VAC 1,55 kOhm ± 10 Ohm
Gas Safety Valve 2 230 VAC 8 kOhm ± 20 Ohm common (neutral) (black
cable)
Gas Regulator 0 - 24 VDC ca. 80 Ohm
min. 25 mA
max. 130 (LPG
165)mA
± 5 Ohm
Fan 230 VAC 38 Ohm ± 5 Ohm
Fan Sensor 1. Vcc = 5VDC (supply)
2. GND (-)
3. Vout (Signal) 5 VDC
check physical - ---
2 ad. Fuse T 1,6 A,
230 VAC (L + N.)
230 VAC 0 Ohm - Cut supply !
Water level switch 24 VDC 300 kOhm
(during operation)
In case of short circuit : <
300 kOhm.
Water Flow Rate Sensor
(Turbine)
1 = “-” 0 VDC
2 = Signal 0-5 VDC
3 = “+” 5 VDC
9,6 Hz = 1,5 l/dk.
68,7 Hz = 10 l/dk.
± 2 Hz
± 6 Hz
Can measured in Hz
between 1. and 2. cable.
Tab. 7