12 Inspection and maintenance
34
Installation and maintenance instructions flexoTHERM exclusive 0020196687_03
12.3
Checking maintenance messages
If the
symbol is shown in the display, the product requires
maintenance work or the product is in the comfort protection
mode.
▶
To obtain further information, call up the
Live Monitor
.
(
→
Page 32)
▶
Carry out the maintenance work that is listed in the table.
Maintenance messages (
→
Page 47)
Conditions
:
Lhm. 37
is displayed
The product is in Comfort protection mode. The product has
detected a permanent fault and continues to run with restric-
ted comfort.
If the temperature sensor for the building circuit outlet, en-
vironment circuit inlet or environment circuit outlet fails, the
product continues to run with replacement values. Active
cooling mode is no longer possible.
▶
To determine which component is defective, read the
fault memory. (
→
Page 33)
Note
If a fault message is present, the product re-
mains in comfort protection mode after it is
reset. After the product is reset, the fault mes-
sage is displayed first before the message
Limp home mode (comfort protection)
ap-
pears again.
▶
Check the component that is displayed and replace it.
12.4
Inspection and maintenance check-list
The following table shows the inspection and maintenance
work that must be carried out at specific intervals.
No.
Work
Inspection
(every year,
within 24
months at
the latest)
Main-
tenance
(every
two
years)
1
Check the general condi-
tion of the product and that
it is leak-tight.
x
x
2
Check the pressure in
the heating circuit and, if
required, top up the heating
water.
x
x
3
Check and clean the dirt
filters in the heating circuit.
x
x
4
Check the volume and
concentration of the brine
fluid and the pressure in
the brine circuit. Top up
with brine fluid if required.
x
x
5
Check that the expansion
vessel and the expansion
relief valve in the brine cir-
cuit are working correctly.
x
x
6
Check that the expansion
vessel and the expansion
relief valve in the heating
circuit are working cor-
rectly.
x
x
No.
Work
Inspection
(every year,
within 24
months at
the latest)
Main-
tenance
(every
two
years)
7
Check for leaks in the
brine and heating circuit,
and repair these leaks if
necessary.
x
x
8
Check that the circuit
breaker in the electron-
ics box is working correctly.
x
x
Warning.
Risk of ignition when performing solder-
ing work on the refrigerant circuit
When performing soldering work on the refri-
gerant circuit as part of a repair, flammable oil
in the refrigerant circuit poses a risk of igni-
tion.
▶
Before performing soldering work, drain
the refrigerant circuit and flush it with inert
gas.
12.5
Checking and correcting the filling
pressure of the heating installation
If the filling pressure falls below the minimum pressure, a
maintenance message is shown on the display.
–
Min. heating circuit pressure:
≥
0.05 MPa (
≥
0.50 bar)
▶
Top up the heating water in order to start up the heat
pump again, Filling and purging the heating installation
(
→
Page 19).
▶
If you notice frequent losses in pressure, determine and
eliminate the cause.
12.6
Checking and correcting the brine circuit's
filling pressure
If the filling pressure falls below the minimum pressure, the
heat pump is automatically shut down and a maintenance
message is shown on the display.
–
Minimum brine fluid pressure:
≥
0.05 MPa (
≥
0.50 bar)
▶
Top up the pre-mixed brine fluid in order to restart the
heat pump, Filling the brine circuit (
→
Page 20). Never
top up with pure water.
–
Min. brine fluid operating pressure:
≥
0.07 MPa
(
≥
0.70 bar)
▶
If you notice frequent losses in pressure, determine and
eliminate the cause.
