Servicing
5
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
55
Subject to modifications resulting from technical improvements!
Boulter Buderus Ltd. • http://www.boulter-boilers.com
z
Reconnect all cables and connections.
5.3.9
Replacing the bi-sensor
z
Disconnect the boiler form the mains power supply.
z
Close gas valve.
z
Drain the system (see page 23).
z
Disconnect the plug of the bi-sensor (see fig. 84, item 1).
z
Remove spring clip (see fig. 84, item 2)
z
Remove the bi-sensor (see fig. 84, item 3).
Some remaining water may leak out.
z
Replace with new sensor and reassemble in reverse order.
z
Fill the system and purge the system of air
(see subsection 2.1.1).
z
Disconnect the boiler form the mains power supply.
z
Close gas valve.
z
Drain the system (see page 23).
z
Disconnect the plug of the return sensor (see fig. 85).
z
Remove the return sensor.
Some remaining water may leak out.
z
Replace with new sensor and reassemble in reverse order.
z
Fill the system and purge the system of air
(see subsection 2.1.1).
fig. 83 Measure resistance of hot water heat retaining sensor
Pin
1
28 55
Pin
81
Pin
16
Pin
1
KIM
81 pin connector laagspanning
16 pin connector hoogspanning
fig. 84 Replace bi-sensor
1
2
3
fig. 85 Disconnect plug return sensor
