Worcester Greenstar i System ErP Series User Manual

Fault finding and diagnosis
Greenstar i System
ErP
- 6 720 806 945 (2015/07)70
8.2 Component resistance characteristics
8.2.1 Flow temperature NTC sensor
8.2.2 DHW NTC sensor
8.2.3 Flue overheat thermostat
8.2.4 Overheat thermostat
8.2.5 Outdoor weather compensation sensor
Resistance ( )
Temperature ( °C)
Measurement tolerance  10%
35,975 0
28,516 5
22,763 10
18,279 15
14,772 20
11,981 25
9,786 30
8,047 35
6,653 40
5,523 45
4,608 50
3,856 55
3,243 60
2,744 65
2,332 70
1,990 75
1,704 80
1,464 85
1,262 90
1,093 95
950 100
Table 50 Central heating flow sensors
Resistance ( )
Temperature ( °C)
Measurement tolerance  10%
36,005 0
28,540 5
22,782 10
18,294 15
14,785 20
11,991 25
9,794 30
8,054 35
6,658 40
5,527 45
4,612 50
3,859 55
3,246 60
2,747 65
2,334 70
1,991 75
1,705 80
1,465 85
1,263 90
1,094 95
951 100
Table 51 Domestic hot water sensors
Normally closed thermostat Resistance ( ) Temperature ( °C)
Opening temperature 3,500  112
Close temperature 6,500  111
Table 52 Flue overheat thermostat
Normally closed thermostat Resistance Temperature ( °C)
Opening temperature  50M   120
Close temperature 5,000   119
Table 53 Overheat thermostat
Resistance ( ) Temperature ( °C)
 4,111 -40
3,669 -35
3,218 -30
2,775 -25
2,360 -20
1,983 -15
1,650 -10
1,363 -5
1,122 0
922 5
759 10
624 15
515 20
427 25
354 30
296 35
247 40
207 45
 174 50
Table 54 Outdoor weather compensation sensor

Worcester Greenstar i System ErP Series Specifications

General

Brand	Worcester
Model	Greenstar i System ErP Series
Category	Boiler
Language	English