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11
Taking out of operation
11
Taking out of operation
DANGER: RISK OF BURNING
When opening the solar return flow connection and the
heating and hot water connections, there is a danger of
scalding and flooding from escaping hot water.
▪ Only empty the storage tank or heating system when it
has cooled down sufficiently and if it is provided with a
suitable device for safely draining off or collecting the es-
caping water.
▪ Wear suitable protective clothing.
11.1
Temporary shutdown
CAUTION
A heating system which is shut down can freeze in the
event of frost and may suffer damage.
▪ Drain the heating system that is shut down if there is
danger of frost.
▪ If the heating system is not drained, the oil and power
supplies must be secured and the main switch must re-
main switched on.
If no heating and no hot water supply are needed for a long period,
the GCU compact can be temporarily shut down.
However, we recommend putting the system into standby mode (see
the documentation concerning the "Controller"). The heating system
is then protected from frost. The pumps and valve protection func-
tions are active.
If it is not possible to guarantee the gas and power supply when
there is danger of frost, then
▪ the GCU compact must be completely drained
▪ suitable antifreeze measures must be taken for the connected
heating system and hot water storage tank (e.g. draining).
INFORMATION
If there is a danger of frost for only a few days with uncer-
tainly in the gas and power supply, the GCU compact does
not need to be drained because the heat insulation is very
good as long as the storage tank temperature is observed
regularly and does not fall below + 3 °C.
However, this provides no frost protection for the connec-
ted heat distribution system.
11.1.1
Draining the storage tank
1
Switch off the main switch and secure against restarting.
2
Close the gas stop valve.
3
Connect the drain hose to the combined filling and draining
filling connection (combined filling and draining BA ac-
cessories)
(Fig.
11-1, item A) and to a waste water drainage
point which is at least at ground level.
INFORMATION
If no KFE filling connection is available, the connecting
piece
(Fig.
11-1, item C) can be detached from the safety
overflow
(Fig.
11-1, item B) and used.
This must be re-installed after the draining process before
the heating system is put back into operation.
Installation and operating instructions
64
Fig. 11-1
Installing the drain hose; optional: Detaching the con-
necting piece from the safety overflow
Item.
Name
A
Combined filling and draining connection (combined
filling and draining accessory)
B
Safety overflow
C
Hose connecting piece for safety overflow
D
Clamping piece
E
Threaded piece
F
Sealing plug
G
connecting angle
H
Assembly wrench
J
cover panel
X
Valve insert
Tab. 11-1 Legend for
Fig. 11-1
Without
solar system
1
Remove the cover plate
(Fig.
draining connection.
2
When using the combined filling and draining connection
(combined filling and draining BA accessory):
▪ Remove the cover panel on the handle and unscrew the
threaded piece
(Fig.
11-2, item E) from the storage tank.
Fig. 11-2
Unscrewing the threaded piece
3
Insert the KFE filling connection in the threaded piece
item E) and secure with the clamping piece
4
Place a suitable collecting tray under the filling and draining con-
nection.
5
Unscrew the threaded piece on the filling and draining connec-
tion
(Fig.
11-4, item E), remove the sealing plug
item F) and immediately screw in the pre-installed threaded in-
sert with combined filling and draining filling connection into
the filling and draining connection
CAUTION
After removing the sealing plug, storage tank water surges
out.
There is no valve or check valve on the filling and draining
connection.
Floor-standing gas condensing boiler with integrated heat storage
to
Fig. 11-6
11-2, item J) from the filling and
(Fig.
11-3,
(Fig.
11-3, item D).
(Fig.
11-4,
(Fig.
11-4) again.
Gas Combi Unit
008.1543899_02 – 04/2019 – EN
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