Servicing
5
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 02/2006
53
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
5.3.18 Changing the hot water / boiler sensor
z
Shut the servicing valve.
z
Drain the 600 - 11S / 19S / 24S / 24C as per the
"Installation and Servicing Instructions".
z
Disconnection plug-and-socket connection on cable to
hot water / boiler sensor.
z
Remove insulation mounting (fig. 76, item 1) and detach
insulation.
z
Pull out the sensor fuses (fig. 77).
z
Unscrew hot water / boiler sensor and replace with new
unit.
z
Refit insulation and corresponding mounting elements.
z
Plug cable connection in once more.
z
Open servicing valves.
z
Fill the 600 - 11S / 19S / 24S / 24C and purge the system
of air as indicated in the installation and servicing
instructions.
5.3.19 Checking the hot surface ignitor
z
Disconnect the system from the power supply.
z
Loosen crosshead screw on UBA housing.
z
Swivel UBA housing downwards.
z
Open the UBA housing.
z
Unplug and remove hot surface ignitor from UBA housing
(fig. 78).
z
Check hot surface ignitor for free throughput.
If throughput is free, the hot surface ignitor is in order.
z
If the hot surface ignitor is in order, plug the cable into the
UBA housing.
z
Shut the UBA housing.
z
Swivel the UBA housing upwards and screw into place.
z
Connect system to mains power supply.
Fig. 76 Changing the hot water / boiler sensor
1
Fig. 77 Changing the hot water / boiler sensor
1
2
Fig. 78 Checking the
hot surface ignitor