11
HM 6Split
HM 12Split
4 Pipe connections
General information
Pipe installation must be carried out in accordance with
the current standards and directives.
The pipe dimensions should not be less than the rec-
ommended pipe diameter according to the table below.
However, in order to achieve the recommended flow,
each installation must be dimensioned individually.
The system can be used with a low- and medium-tem-
perature climate system. The recommended temper-
ature of the heating medium at the dimensioned out-
door temperature DOT must not exceed 55°C on the
supply and 45°C on the return circulation from the cli-
mate system. HM 6Split / HM 12Split can reach up to
70°C when using the electric additional heat or anoth-
er peak heat source. An overflow pipe must be rout-
ed from the safety valve to a suitable drain. The entire
length of the overflow pipe must be inclined towards
the floor drain to prevent water pockets and must also
be frost-proof. In order to reach maximum system
efficiency, we recommend installing HM 6Split / HM
12Split as close as possible to the outdoor heat pump.
The HM 6Split / HM 12Split unit is not equipped with
a shut-off valve for the climate system. In order to
facilitate future servicing, the shut-off valves should
be installed on the outside of the indoor unit.
The HM 6Split / HM 12Split unit can be docked to the
central heating, cooling operation and hot water sys-
tems. It is absolutely necessary to install the safety
assembly on connection XL11.
Air/water
heat pump
Minimum flow
during defrosting
(100% pump
capacity [l/s])
Minimum
recommend-
ed pipe
dimension
(DN)
Minimum
recommend-
ed pipe
dimension
(mm)
HM 6Split
+ L 6Split
0,19
20
22
HM 12Split
+ L 8Split
0,19
20
22
HM 12Split
+ L 12Split
0,29
20
22
CAUTION
All high points in the climate system must be equipped
with suitable air vents.
CAUTION
In the installation before the HM 6Split / HM 12Split,
a particulate filter should be used, dedicated for heat-
ing installations. The filter will protect the unit against
pollution.
CAUTION
The pipelines need to be flushed out before the indoor
unit is connected so that any debris cannot damage
component parts.
CAUTION
Until the system’s heating/cooling circuit has been
filled with heating medium, the switch (SF1) in the
controller must not be set to “I” or „ ”. If you do
not comply with the above instructions, many com-
ponents of the HM 6Split / HM 12Split unit may be
damaged.
Minimum system flow
The installation must be dimensioned at least to the
extent required to manage the minimum defrosting
flow at 100% circulation pump operation, see table.
CAUTION
An incorrectly dimensioned climate system can result
in damage to the appliance and lead to malfunctions.
The unit is equipped with an ex-
pansion vessel with a 12 capac-
ity. The pressure setting in the
level vessel should be set ac-
cording to the maximum height
(H) between the vessel and the
highest-positioned radiator, see
drawing. An initial pressure of
0.5 bar (5 mvp) means a maxi-
The expansion vessel’s volume must be at least 5%
of the system’s total volume. HM 6Split / HM 12Split
appliances have been equipped with an expansion
vessel with a 12l volume. If the capacity of the built-in
expansion vessel is insufficient, an additional expan-
sion vessel meeting the above requirements should
be added to the installation.
Table with examples:
Total volume [l]
(indoor unit and climate system)
Volume [l],
expansion vessel
500
12+13
750
12+23
1000
12+38
Expansion vessel
H
mum permissible height difference of 5 m.
Section 4 |
Pipe connections
CAUTION
Ensure that incoming heating medium is without pol-
lution. When using a private well, it maybe necessary
to supplement with an extra water filter.
CAUTION
When the heat pump is used for cooling below 18 °C, the
insulation of heating system must be impermeable to va-
por diffusion tight. In addition, in cooling mode, a dew point
monitor must always be installed at the most unfavorable
point in the pipeline system, which switches off the heat
pump if the temperature drops below the dew point.
