water outlet pipes. Please make sure the dropping condensate will not result in damage of
your furniture and other devices.
Checking the water volume and expansion vessel pressure
The unit is equipped with an expansion vessel of 6.5 liter which has a default pre-pressure of 1
bar.
To assure proper operation of the unit, the pre-pressure of the expansion vessel might need to
be adjusted and the minimum and maximum water volume must be checked.
Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the expansion vessel (1bar), keep in
mind the following guidelines:
● Use only dry nitrogen to set the expansion vessel pre-pressure.
● Inappropriate setting of the expansion vessel pre-pressure will lead to malfunction of the
system. Therefore, the pre-pressure should be adjusted by a licensed installer.
Calculating the water circuit pressure drop
If the water circuit pressure drop excluding the indoor is too high, an auxiliary pump is necessary
to be installed in the water circuit.
Caution
●An auxiliary pump should be installed while the water resistance is more than 30kpa.
●The auxiliary pump should be installed while the water resistance is more than 30kpa. The
pressure drop is too high may cause heating/cooling capacity reduction, the heat exchanger
freeing and the pump damage.
Warning
If the indoor unit is not running for 24 hours, the pump in the indoor unit and the auxiliary pump(if
installed) will turn on and run for 3 minutes to preventing pump from blocking.
Connecting the water circuit
WARNING
Be careful! the unit pipes may be deformed by using excessive force when connecting the piping.
Deformation of the piping can cause some malfunctions.
Water connections must be made in accordance with the outlook diagram delivered with the unit,
respecting the water in- and outlet.
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into
account the following when connecting the water circuit:
● Use clean pipes only.
● Hold the pipe end downwards when removing burrs.
● Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
● Use a good thread sealant for the sealing of the connections. The sealing must be able to
withstand the pressures and temperatures of the system.
● When using non-brass metallic piping, make sure to insulate both materials from each other to
prevent galvanic corrosion.
● Because brass is a soft material, use appropriate tooling for connecting the water circuit.
Inappropriate tooling will cause damage to the pipes.
WARNING
● The unit is only to be used in a closed water system. Application in an open water circuit can
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