Removing The Burner - Viessmann B0KA Installation And Service Instructions Manual

Burner adjustment when connecting multiple...
For multiple connection, in the commissioning assis-
tant use "C.5" and "C.6" to match the burner setting
to the flue system. See page 30.
System conditions:
Shared flue in shaft 100 mm
■
7
Balanced flue connection pipe from boiler to shaft,
■
80/125 mm
7

Removing the burner

Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
■ Never touch the wiring chambers (control unit
and power supply connections).
■ When working on the appliance, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
■ Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
1. Turn off the ON/OFF switch.
2. Close the gas shut-off valve and safeguard against
reopening.
3. Disconnect cables and leads from:
■ Fan motor (2 plugs)
A
■ Ionisation electrode
■ Ignition unit
C
■ Earth
D
B
Commissioning, inspection, maintenance
(cont.)
Minimum shaft cross-section
■
– Square: 175 x 175 mm
– Round: 195 mm
7
■ Height between floors min. 2.5 m
■ Max. 6 boilers with the same rated heating output
connected to the flue system
4x
F
D
C
B
A
Fig. 28
4. Undo gas supply pipe fitting
5. Undo 4 screws and remove the burner.
F
Note
Cover gas connection
can fall into it.
E
.
E
so that no small parts
E
41