Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
43
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
Maintenance
4
4.1.2 Cleaning the heat exchanger after
dismantling
z
Disconnect the system from the power supply.
z
Close the gas service valve.
z
Loosen the retaining screw and remove the casing.
z
Close the heating shutoff valves and drain the
system.
To drain the boiler take the following steps:
z
First drain the system.
z
In case of frost, drain the boiler.
z
Loosen the draining nipple with a screwdriver see
fig. 42.
z
Attach temporary hose to the nipple. Connect the
other side of the temporary hose to a draining pipe.
z
When the boiler is drained, tighten the draining nipple
screw.
z
Release plug-in connection of fan power lead
(fig. 37, item 1, page 41), burner-control unit fan
control lead (fig. 37, item 2, page 41) and gas-burner
assembly (fig. 37, item 3, page 41).
z
Loosen union nut on gas valve assembly (fig. 37,
item 4, page 41).
z
Push safety plate out of way.
z
Turn air silencer tube and pull off from below.
z
Swivel the gas-air unit forward (fig. 38, item 1,
page 41).
z
Pull the gas-air unit up and out of bayonet connector
(fig. 38, item 2, page 41) and remove via front of unit.
z
Remove rubber seal in combustion chamber from top
(fig. 39, item 2, page 41).
CAUTION!
CAUTION!
The burner gasket must match the shape
of the groove in the housing.
CAUTION!
CAUTION!
Check the heat exchanger for leaks
BEFORE reassembling the casing shells.
CAUTION!
CAUTION
Shut off the system water supply side by
closing the heating shutoff valve.
Fig. 42 Draining the boiler
NOTE
If the boiler is going to be out of service for
prolonged period, drain the boiler.
