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Kaysun KEM-14 DTN Seite 22

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2. Check that the total water volume in the entire water circuit
is lower than this value.
If this is not the case, the expansion vessel inside the unit is too small
for the installation.
A1
B1 A2
B2
pre-pressure = pre-pressure of the expansion vessel maximum
water volume = maximum water volume in the system
A1 System without glycol for the 10~16 kW unit
A2 System without glycol for the 5/7 kW unit
B1 System with 25% propylene glycol for the 10~16 kW unit
B2 System with 25% propylene glycol for the 5/7kW unit
(Refer to “Caution: Use of glycol” on Page 21.)
Example 1
The 10kW unit is installed 5 m below the highest point in the
water circuit.
The total water volume in the water circuit is 60 L.
In this example, no action or adjustment is required.
Example 2
The 10kW unit is installed at the highest point in the water circuit. The
total water volume in the water circuit is 100 L. Result:
■ Since 100 L is more than 88 L, the pre-pressure must
be decreased (see table above).
■ The required pre-pressure is:
Pg(bar) = (H(m)/10+0.3) bar = (0/10+0.3) bar = 0.3 bar
■ The corresponding maximum water volume can be read from
the graph: approximately 158 L.
■ Since the total water volume (100 L) is below the maximum water
volume (158 L), the expansion vessel suffices for the installation.
5.5.4 Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the
expansion vessel (1.5 bar), 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 malfunctioning of the system. Pre-pressure should only
be adjusted by a licensed installer.
5.5.5 Connecting the water circuit
Water connections must be made in accordance with the outlook
diagram delivered with the unit, with respect to the water intake
and water outlet.
Be careful not to deform the unit’s piping by using excessive
force when connecting the piping. Deforming the piping can
cause the unit to malfunction.
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 sealing 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 tools for connecting the
water circuit.
Inappropriate tools will cause
damage to the pipes.
NOTE
The unit is only to be used in a closed water system. Application
in an open water circuit can lead to excessive corrosion of the
water piping:
■ Never use Zn-coated parts in the water circuit. Excessive
corrosion of these parts may occur as copper piping is used in
the unit's internal water circuit.
■ When using a 3-way valve in the water circuit. Preferably
choose a ball type 3-way valve to guarantee full separation
between the domestic hot water and floor heating water circuit.
■ When using a 3-way valve or a 2-way valve in the water circuit.
The recommended maximum changeover time of the valve
should be less than 60 seconds.
5.5.6 Protecting the water circuit against freezing
Frost can cause damage to the hydraulic system. As this unit is
installed outdoors and thus the hydraulic system is exposed to
freezing temperatures, care must be taken to prevent freezing of
the system.
All hydraulic parts are insulated to reduce heat loss. Insulation must
be present on the field piping.
The unit is already equipped with several features to prevent
freezing. For example: the software contains special functions using
pump and heat pump to protect the entire system against freezing.
When the temperature of the water flow in the system drops to a
certain value, the software will heat the water, either using the heat
pump, the electric heating tap. The freeze protection function will turn
off only when the temperature increases to a certain value. Refer to
“7.3 Operating characteristics” .
In case of a power failure, the features mentioned above cannot
protect the unit from freezing.
Since a power failure could happen when the unit is unattended,
the supplier recommends adding glycol to the water system. Refer
to “Caution: Use of glycol” .
Depending on the expected lowest outdoor temperature, make sure
the water system is filled with a concentration of glycol as mentioned
in the table below.
When glycol is added to the system, the performance of the unit
will be affected. The correction factor of the unit capacity, flow rate
and pressure drop of the system is listed in the table below:
Ethylene Glycol
Quality of
Modification coefficient
Freezing
glycol/%
Cooling capacity
Power
Water
Water flow
point/℃
modification
modification
resistance
modification
0
1.000
1.000
1.000
1.000
0.000
10
0.984
0.998
1.118
1.019
-4.000
20
0.973
0.995
1.268
1.051
-9.000
30
0.965
0.992
1.482
1.092
-16.000
40
0.960
0.989
1.791
1.145
-23.000
50
0.950
0.983
2.100
1.200
-37.000
Propylene Glycol
Quality of
Modification coefficient
Freezing
glycol/%
Cooling capacity
Power
Water
Water flow
point/℃
modification
modification
resistance
modification
0
1.000
1.000
1.000
1.000
0.000
10
0.976
0.996
1.071
1.000
-3.000
20
0.961
0.992
1.189
1.016
-7.000
30
0.948
0.988
1.380
1.034
-13.000
40
0.938
0.984
1.728
1.078
-22.000
50
0.925
0.975
2.150
1.125
-35.000
If no glycol is added, the water must be drained out when there is
a power failure.
21
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