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Draining
54 Instruction manual SGE
6
gis
Caution
The installation diagram shows a pump station with an integrated non-return
valve. This type of pump unit may only be used with closed systems. In systems
with drain-back, installation of a pump unit with non-return valve is prohibited.
There are special pump units for these systems. Please contact the pump unit
supplier for this.
6.1 Draining unvented
installations
Some service activities require the water heater to be drained. The procedure
is as follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
4. Wait until the fan has stopped. The icon is then dimmed.
Caution
Failure to wait until the fan stops can cause damage to the water heater.
5. Switch the water heater OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by setting the isolator
between the water heater and the mains power supply to position 0.
7. Shut off the gas supply (10).
8. Close the stop valve (11) in the hot water pipe.
9. Close the supply valve (4) in the cold water inlet (A).
10. Open the drain valve (9).
6.2 Draining vented
installations
Some service activities require the water heater to be drained. The procedure
is as follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
4. Wait until the fan has stopped. The icon is then dimmed.
Caution
Failure to wait until the fan stops can cause damage to the water
heater.
5. Switch the water heater OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by setting the isolator
between the water heater and the mains power supply to position 0.
7. Shut off the gas supply (10).
8. Close the stop valve (11) in the hot water pipe.
9. Close the stop valve (4) between the cold water head tank and the cold
water inlet (A).
10. Open the drain valve (9).
11. Bleed the water heater (or installation) so that it drains completely.
MENU
»OFF
^ ON
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