Table of Contents
Advertisement
Servicing
Measure the resistance of the return sensor (see fig. 77).
Disconnect the plugs of the hot water out flow sensor
(fig. 78, item 1) and the hot water heat retaining sensor
(fig. 78, item 2).
Measure the resistance of both sensors (see fig. 79 and
fig. 80).
Use a second-reading thermometer to measure the
temperature around the sensor.
Compare readings with values shown in the table below. If
there is any mismatch (i.e.
Resistance values of the sensors
Temperature
Resistance
in Ω
in °C
0
29.490
5
23.462
10
18.787
15
15.136
20
12.268
25
10.000
30
8.197
35
6.754
40
5.594
45
4.656
50
3.893
Table 11 Resistance values of the sensors
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
≤
10%), the sensor is defective.
Temperature
Resistance
in Ω
in °C
55
3.271
60
2.760
65
2.339
70
1.990
75
1.700
80
1.458
85
1.255
90
1.084
95
940
100
817
fig. 77 Measure resistance return sensor
2
1
fig. 78 Disconnect plugs of hot water sensors
fig. 79 Measure resistance of hot water out flow sensor
Boulter Buderus Ltd. • http://www.boulter-boilers.com
5
53
Advertisement
Table of Contents
