78
Installation and maintenance instructions 0020297933_07
8.5
Available remaining feed pressure
The following characteristics apply to the heating circuit for
the outdoor unit and relate to a heating water temperature of
20 °C.
0
10
20
30
40
50
60
70
80
90
100
1200
1600
800
400
2000
A
B
1
2
A
Volume flow, in l/h
B
Remaining feed pres-
sure, in kPa
1
VWL 35/6 and VWL
55/6
2
VWL 65/6 and VWL
75/6
9
Handing over to the end user
9.1
Instructing the end user
▶
Explain to the end user how the product operates. Inform
them about whether a system separation is present and
how the frost protection function is guaranteed.
▶
Point out, in particular, the safety warnings to the end
user.
▶
Point out to the end user the particular risks and rules of
conduct that are associated with R290 refrigerant.
▶
Make the end user aware of the need for regular main-
tenance.
10 Troubleshooting
10.1
Fault messages
In the event of a fault, a fault code is shown on the display of
the indoor unit's control.
▶
Use the "Fault messages" table (
→
installation instruc-
tions for the indoor unit, Appendix).
10.2
Other faults
▶
Use the "Troubleshooting" table (
→
installation instruc-
tions for the indoor unit, Appendix).
11 Inspection and maintenance
11.1
Preparing for inspection and maintenance
▶
Only carry out the work if you are competent and have
knowledge about the special features and risks of R290
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 R290. 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.
▶
If you are working on the product when it
is open, before starting work, use a gas
sniffer to ensure that there is no leak.
▶
In the case of a leak: Close the product's
housing, inform the end user, and notify
customer service.
▶
Keep all ignition sources away from the
product. In particular, open flames, hot
surfaces with temperatures above 370 °C,
electrical devices that are not free from
electrical sources, static discharges.
▶
Ensure that the room is sufficiently aer-
ated around the product.
▶
Use a restriction to ensure that unauthor-
ised personnel cannot enter the protective
zone.
▶
Observe the basic safety rules before carrying out in-
spection and maintenance work or installing spare parts.
▶
When working in an raised position, observe the occupa-
tional safety rules (
▶
Switch off all of the disconnectors to which the product is
connected in the building.
▶
Disconnect the product from the power supply but ensure
that the product is still earthed.
▶
When working on the product, protect all electric com-
ponents from spraying water.
