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11.4
Observing inspection and maintenance
intervals
▶
Adhere to the minimum inspection and maintenance in-
tervals. Carry out all of the work that is listed in the "In-
spection and maintenance work" table in the appendix.
▶
Carry out maintenance work on the product at an earlier
point if the results of the inspection that was carried out
during previous maintenance make this necessary.
11.5
Preparing for inspection and maintenance
▶
Only carry out the work if you are competent and have
knowledge about the special features and risks of R32
refrigerant.
Danger!
Risk of death caused by fire or explosion
if there is a leak in the refrigerant circuit!
The product contains the combustible refri-
gerant R32. In the event of a leak, escaping
refrigerant may mix with air to form a flam-
mable atmosphere. There is a risk of fire and
explosion. In the event of a fire, toxic or cor-
rosive substances, such as carbonyl fluoride,
carbon monoxide or hydrogen fluoride, are
produced.
▶
If you are working on the product when it
is open, before starting work, use a gas
sniffer that is free of ignition sources to
ensure that there is no leak.
▶
If you notice a leak, close the product's
housing, inform the end user and notify
customer service.
▶
Keep all ignition sources away from the
product. Ignition sources are, for example,
open flames, hot surfaces with temper-
atures above 550 °C, electrical devices
or tools that are not free from electrical
sources, or static discharges.
▶
Ensure that the room is sufficiently aer-
ated around the product.
▶
Use a restriction to ensure that unauthor-
ised personnel are kept away from the
product.
Danger!
Risk of death from electric shock when
opening the electronics box!
Capacitors are installed in the product's
electronics box. Even after switching off the
power supply, residual voltage is still present
in electrical components for 60 minutes.
▶
Only open the electronics box after a wait-
ing period of 60 minutes.
▶
Observe the basic safety rules before carrying out in-
spection and maintenance work or installing spare parts.
▶
Switch off the disconnector to which the product is con-
nected in the building.
8000017440_FT Installation and maintenance instructions
▶
Disconnect the product from the power supply but ensure
that the product is still earthed.
▶
Secure the product against being switched back on
again.
▶
Before working in the electronics box, comply with a wait-
ing period of 60 minutes after switching off the power
supply.
▶
When working on the product, protect all electric com-
ponents from spraying water.
▶
Remove the front casing.
11.6
Checking the pre-charge pressure of the
expansion vessel
1.
Close the service valves and drain the heating circuit.
(→ Page 235)
2.
Measure the pre-charge pressure of the expansion
vessel at the valve (1).
Result:
Note
The required pre-charge pressure of the
heating installation may vary depending
on the static pressure (0.1 bar per metre in
height).
Pre-charge pressure is below 0.75 bar (±0.1 bar/m)
▶
Fill the expansion vessel with nitrogen. If nitrogen is
not available, use air.
3.
Fill the heating circuit. (→ Page 224)
11.7
Checking and, if required, replacing the
magnesium protection anode
1
2
1.
Drain the product's domestic hot water circuit.
(→ Page 235)
2.
Swivel the electronics box to the side. (→ Page 214)
3.
Remove the heat insulation (1) on the magnesium pro-
tection anode.
4.
Unscrew the magnesium protection anode (2) from the
domestic hot water cylinder.
5.
Check the anode for corrosion.
Result:
The anode is corroded by more than 60%.
The anode is more than 5 years old.
▶
Replace the magnesium protection anode with a
new one.
6.
Seal the threaded connection with Teflon tape.
7.
Screw the old and/or new magnesium protection anode
into the cylinder. The anode must not touch the walls of
the cylinder.
8.
Fill the domestic hot water cylinder.
9.
Check the threaded connection for tightness.
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