Inspection and maintenance 12
0020213394_01 flexoTHERM exclusive Installation and maintenance instructions
35
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 33)
▶
Carry out the maintenance work that is listed in the table.
Maintenance messages (
→
Page 48)
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, building circuit outlet, environment
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 34)
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 condition
of the product and that it is
leak-tight.
x
x
2
Check the pressure in the
heating circuit and, if re-
quired, 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 con-
centration 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 circuit
are working correctly.
x
x
6
Check that the expansion
vessel and the expansion
relief valve in the heating
circuit are working correctly.
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 re-
pair these leaks if necessary.
x
x
8
Check that the circuit
breaker in the electronics
box is working correctly.
x
x
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 18).
▶
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 brine fluid to start up the heat pump again,
Filling the brine circuit (
→
Page 19).
–
Min. brine fluid operating pressure:
≥
0.07 MPa
(
≥
0.70 bar)
▶
If you notice frequent losses in pressure, determine and
eliminate the cause.
12.7
Carrying out a restart and test operation
Warning.
Risk of burns due to hot and cold com-
ponents.
There is a risk of burns from any uninsulated
pipelines and from the auxiliary electric heat-
ing.
▶
Before starting up the unit, install any cas-
ing sections that have been removed.
1.
Start up the heat pump system.
2.
Check that the heat pump system is working without
any problems.
