4
Fig. 4.1
4 Preliminary measures
•
Completely remove the front panels
according to the instructions for
installation and servicing supplied
with the boiler.
•
Remove the combustion chamber
front cover.
•
Turn off appliance by switching off
main switch.
•
Pull off air orifice (1); see fig. 4.1.
High flow temperatures may cause
burns and scalds.
Check flow temperature and cool
appliance, if necessary.
Cooling the appliance
•
Turn on appliance by switching on
main switch.
•
Ensure heat demand,
For VUW, open a hot water tap.
For VU, turn on all external controls.
The appliance remains in the start
mode. There is, however, no igniti-
on and no gas supply. The pump
and the fan are in operation and
cool the appliance. The ignition
cycle is stopped by the control after
3 minutes. (Fault signalling F 30).
During this period the boiler should
be sufficiently cooled.
•
Check appliance temperature,
repeat above procedure if required.
•
Turn off appliance by switching off
main switch.
•
Isolate the boiler from the electrical
supply by disconnecting the plug at
the socket outlet (if there is an isola-
ting switch only, then remove the
fuse from the switch).
GW 879/0
