Ntc Characteristic - Bosch HP270-2 Technical Manual

The NTC sensor for bottom water temperature measurement is with clip included to detect temperature by contact
and does not need conductivity thermal paste. In The HP270-3 and HP200/250-1 the same sensor becomes
discharge temperature control (T
The NTC sensors for air and hot water are the same component, but give different information to the software in
the electronic control. Following table indicates the measurable resistance value to check and identify each proper
function, depending on the correspondent assembly position.
These NTC sensors (air and hot) are from 10kΩ type. In case their minimum and maximum operation values are
below or above the expected temperature/resistance values, the display will present the correspondent error code.
The NTC sensor in the fins is a 8kΩ type with characteristic listed on table 9.
Temperature
(ºC)
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Model Model
HP270-2 HP270-2
+5ºC / +35ºC -10ºC / +35ºC
X X
X X
X X
X X
X X
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) as it is located between Electric heater and
dis
NTC Resistance (Ω)
(8kΩ type)
(fins NTC)
37450
29710
23730
19090
15450
12580
10310
8495
7037
5860
4905
4125
3485
2957
2521
2157
1853
1598
1384
1202
1048
916
804
Table 9 – NTC characteristic
Model Model
HP270-3 HP200/250-1
-10ºC / +35ºC +5ºC / +35ºC
X X
X X
X X
X X
X
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
tank.
NTC Resistance (Ω)
(10kΩ type)
(air & hot NTC)
55330
42320
32650
25390
19900
15710
12490
10000
8057
6531
5327
4369
3603
2986
2488
2083
1752
1481
1258
1072
917
788
680
Component
Air Flow NTC (T air)
Hot Water NTC (T top)
Cold Water NTC (T
bottom)
Discharge water NTC
(after e-heater)
Fins NTC (T fins)
Pump Wilo
(ZRS12-2/3 Ku-C)
NTC Resistance (Ω)
(10.1kΩ type)
(cold or discharge NTC)
30400
25902
20247
15950
12657
10115
8138
6589
5367
4398
3624
3002
2500
2092
1759
1486
1260
1074
918
788
680
Characteristics
R 10k = 25ºC = 10000 Ω
R 10k = 25ºC = 10000 Ω
R 10k = 25ºC = 10115 Ω
R 10k = 25ºC = 10115 Ω
R 8k = 25ºC = 8400 Ω
230 (196 – 253) V ac
50 (47,5 – 52,5) Hz
19 / 32 / 48 W
(0,10 / 0,15 / 0,21 A)