Manual Kaysun KEM-10 DVN (page 22 of 48) (English)

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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.

B1 A2

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

resistance

modification

1.000

0.000

0.984

0.998

1.118

1.019

-4.000

0.973

0.995

1.268

1.051

-9.000

0.965

0.992

1.482

1.092

-16.000

0.960

0.989

1.791

1.145

-23.000

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

resistance

modification

1.000

0.000

0.976

0.996

1.071

1.000

-3.000

0.961

0.992

1.189

1.016

-7.000

0.948

0.988

1.380

1.034

-13.000

0.938

0.984

1.728

1.078

-22.000

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.

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