Close Maintenance Isolating Valves; Drain The 800 Series - Buderus 800-24 Installation And Servicing Instructions

5.3.10 Replacing the flow, return and safety sensors

Close maintenance isolating valves.

Drain the 800 Series.

Unplug.
Unscrew sensor and replace with new unit.
Plug in cable connection.
Open maintenance isolating valves.
NOTE
Fill the 800 Series and purge the system of air.
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 10 Resistance values (indicative values) of the sensors
(˚C)
Outside temperature sensor
25
20
15
10
5
0
-5
-10
-15
-20
10,000 20,000
fig. 69 Outside temperature sensor diagram
Subject to modifications resulting from technical improvements !
Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
Temperature Resistanc
e 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 1,940
100 1,817
30,000 40,000 50,000
fig. 67 Replacing the flow/return sensors
(˚C)
Boiler temperature sensor
90
80
70
60
50
40
30
20
10
0
0
5,000
fig. 68 Boiler temperature sensor diagram
60,000 70,000 80,000
Servicing
R (Ω)
10,000 15,000
R (Ω)
Buderus • http://buderus-domestic.co.uk
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