Component Resistance Characteristics; Flow Temperature Ntc Sensor; Dhw Ntc Sensor; Flue Overheat Thermostat - Worcester Greenstar i System ErP Series Installation, Commissioning And Servicing Instructions

Fault finding and diagnosis
8.2

Component resistance characteristics

8.2.1

Flow temperature NTC sensor

Temperature ( °C)
Resistance ( ) Measurement tolerance  10%
35,975
28,516
22,763
18,279
14,772
11,981
9,786
8,047
6,653
5,523
4,608
3,856
3,243
2,744
2,332
1,990
1,704
1,464
1,262
1,093
950
Table 50 Central heating flow sensors
8.2.2

DHW NTC sensor

Temperature ( °C)
Resistance ( ) Measurement tolerance  10%
36,005
28,540
22,782
18,294
14,785
11,991
9,794
8,054
6,658
5,527
4,612
3,859
3,246
2,747
2,334
1,991
1,705
1,465
1,263
1,094
951
Table 51 Domestic hot water sensors
70
8.2.3
Normally closed thermostat
Opening temperature
Close temperature
0
5
Table 52 Flue overheat thermostat
10
8.2.4
15
Normally closed thermostat
20
Opening temperature
25
Close temperature
30
Table 53 Overheat thermostat
35
40
8.2.5
Resistance ( )
45
50
55
60
65
70
75
80
85
90
95
100
0
5
10
15
Table 54 Outdoor weather compensation sensor
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100

Flue overheat thermostat

Resistance ( ) Temperature ( °C)
3,500
6,500

Overheat thermostat

Resistance
 50M 
5,000 

Outdoor weather compensation sensor

Temperature ( °C)
 4,111
3,669
3,218
2,775
2,360
1,983
1,650
1,363
1,122
922
759
624
515
427
354
296
247
207
 174
Greenstar i System
 112
 111
Temperature ( °C)
 120
 119
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
- 6 720 806 945 (2015/07)
ErP