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Operating hours for heating mode, hot
water handling mode, cooling mode and
the overall operation
5.8 Setting the language
Menu → Basic settings → Language
– Setting the desired language
6 Maintenance and care
6.1 Checking and maintaining
6.1.1 Fulfilling requirements for the
installation site
The installation site must be dry and frost-
proof throughout.
Conditions: Outdoor air heat source
The air/brine collector is designed to be
operated with outdoor air. The air intake
and blow-off route of the outdoor unit must
be kept clear at all times in order to guar-
antee that the air can flow unhindered and
as intended. Vegetation and, in winter,
snowfall, must be cleared.
You are not permitted to make any sub-
sequent structural alterations which
may result in a reduced room volume
or a change to the temperature at the
installation site.
6.1.2 Caring for the product
Caution.
Risk of material damage
caused by unsuitable clean-
ing agents.
▶
Do not use sprays, scouring
agents, detergents, solvents
or cleaning agents that con-
tain chlorine.
▶
Clean the casing with a damp cloth and
a little solvent-free soap.
0020213396_00 flexoTHERM Operating instructions
Maintenance and care 6
6.1.3 Checking the system pressure
▶
Check the filling pressure of the heating
installation every day for a week after
initial start-up and maintenance work,
and then twice a year.
– Filling pressure: ≥ 0.07 MPa
( ≥ 0.70 bar)
Filling pressure too low
▶
Inform your competent person so
that he can add heating water and
increase the filling pressure.
6.1.4 Checking the brine circuit's
filling pressure
▶
Check the brine circuit's filling pressure
at regular intervals. Read the brine cir-
cuit's filling pressure in the heat pump's
display.
– Brine fluid operating pressure range:
0.07 ... 0.20 MPa (0.70 ... 2.00 bar)
7 Troubleshooting
7.1 Fault message
If several faults occur at the same time,
the display shows the corresponding fault
messages for two seconds each in alterna-
tion.
F.714 Environment circuit: Pressure too
low
If the filling pressure falls below the min-
imum pressure, the heat pump will be
switched off automatically.
– Minimum brine fluid pressure:
≥ 0.05 MPa ( ≥ 0.50 bar)
– Min. brine fluid operating pressure:
≥ 0.07 MPa ( ≥ 0.70 bar)
▶
Inform your competent person so that
he can top up the brine fluid.
F.723 Building circuit: Pressure too low
If the filling pressure falls below the min-
imum pressure, the heat pump will be
switched off automatically.
13
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