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LIA 0608HWCF M - LIA 0911HWCF M English
Fig. 6.1:Guide values for filling water and supplementary water as well as
heating water
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends the use of fully demineralised
water and a pH stabiliser to minimise the risk of corrosion in the
heat pump and heating system.
CAUTION!
!!
With fully demineralised water, it is important to ensure that
the minimum permissible pH value of 7.5 (minimum
permissible value for copper) is complied with. Failure to
comply with this value can result in the heat pump being
destroyed.
The buffer tank and heating system must be filled via the filling
and drain cock on the indoor unit. The heat pump hydraulic sys-
tem is purged via the automatic air-relief cock located on the
pump group of the indoor unit.
To fully purge the indoor unit, the 3-way mixer valve must be
set manually to the "middle position" (reset once purging is
complete).
NOTE
ººººº
If the unit is connected to an existing hydraulic water circuit,
the hydraulic pipes must be cleaned to remove residues and
limescale.
Hot water outlet
The hot water outlet connection supplies domestic hot water
throughout the building and must be distributed to different
water-consuming outlets as required.
The connection on the indoor unit is a 3/4 inch copper pipe
connection.
CAUTION!
!!
Pipe runs should be made as short as possible and oversizing
should be avoided. All pipework should be laid in accordance
with legal requirements to prevent heat loss from the system
and avoid the build up of condensate.
A suitable purging facility must also be installed in the heating
circuit on site.
It is recommended to install a shut-off device in the return be-
fore integration into the indoor unit is carried out.
Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating system.
CAUTION!
!!
If the minimum heating water flow rate is undershot, the plate
heat exchanger in the refrigeration circuit can freeze, which
can lead to total damage of the heat pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into
account during planning. With design temperatures below
30 °C in the flow, the design must be based on the max. volume
flow with 5 K spread for A7/W35.
The specified nominal flow rate (see “Device information” on
page 29.) must be assured in all operating states. A built-in flow
rate sensor is used only for switching off the heat pump in the
event of an unusual and abrupt drop in the heating water flow
rate and not for monitoring and fusing the nominal flow rate.
Frost protection
If the indoor unit is installed where there is a risk of frost, manual
drainage must be provided. A method of manual drainage must
be provided for heat pump internal components which are ex-
posed to frost. The frost protection function of the heat pump
manager is active whenever the heat pump manager and the
heat circulating pump are ready for operation. The system must
be drained if the heat pump is taken out of service or in the
event of a power failure. The hydraulic network should be oper-
ated with suitable frost protection if heat pump systems are im-
plemented in buildings where a power failure cannot be de-
tected (e.g. holiday homes).
Filling and supplementary water as well as heating water, depending on
heat output
Overall heat output in kW
Total alkaline earths in mol/m³
(Total hardness in dGH)
Specific system volume in l/kW
Heat output
1
1. For the purpose of calculating the specific system volume, the smallest indi-
vidual heat output is to be used for systems with several heat generators.
20
20 to
50
50
50
specific water content
heat generator > 0.3 k per kW
2
2. In systems with several heat generators with different specific water con-
tents, the smallest specific water content is decisive.
none
3.0 (16.8)
< 0.05 (0.3)
50
specific water content
(e.g. circulating water heaters)
and systems with electric heat-
ing elements
3.0 (16.8)
1.5 (8.4)
> 50 kW to
200 kW
2.0 (11.2)
1.0 (5.6)
> 200 kW to
600 kW
1.5 (8.4
< 0.05 (0.3)
> 600 kW
< 0.05 (0.3)
Heating water, depending on heating output
Operating mode
Electrical conductivity in µS/cm
Low-salt
3
3. For systems with aluminium alloys, full softening is recommended.
> 10 to
100
Containing salt
> 100 to
1500
Appearance
clear, free from sedimentary substances
Materials in the system
pH value
Without aluminium alloys
8.2 to 10.0
With aluminium alloys
8.2 to 9.0
Domestic hot water outlet
Cold water inlet
Return
Flow
Split pipes connection
Cable entry
Содержание LIA 0608HWCF M
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