Bedienungsanleitung Kaysun KEM-12 DTN (Seite 21 von 48) (Englisch)

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5.5 Water pipe installation

NOTE

■ If there is no glycol (anti-freeze) in the system there is a power

supply or pump failure, drain the system (as shown in the

figure below).

WARNING

A <A

When water is not moving inside the system in

cold weather, freezing is very likely and will

damage the system.

5.5.1 Water quality control

1 Water quality control

When industrial water is used as chilled water, little furring may

occur; however, well water or river water, used as chilled water,

may cause much sediment, such as furring, sand, and so on.

Therefore, well water or river water must be filtered and softened

in softening water equipment before flowing into chilled water

system. If sand and clay settle in the evaporator, circulation of

chilled water may be blocked, and thus leading to freezing

accidents; if hardness of chilled water is too high, furring may

occur easily, and the devices may be corroded. Therefore, the

quality of chilled water should be analysed before being used,

such as PH value, conductivity, concentration of chloride ion,

concentration of sulphide ion, and so on.

2 Applicable standard of water quality for the unit

PH value

6～8

Total hardness

<50ppm

Conductivity

<200μV/cm(25℃)

Sulfide ion

Chloride ion

<50ppm

Ammonia ion

Sulfate ion

<50ppm

Silicon

<30ppm

Iron content

<0.3ppm

Sodium ion

No requirement

Calcium ion

<50ppm

5.5.2 Checking the water circuit

The units are equipped with a water inlet and outlet for connection to

a water circuit. This circuit must be provided by a licensed technician

and must comply with local laws and regulations.

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.

Before continuing installation of the unit, check the following:

■ The maximum water pressure can not exceed 3 bar.

■ The maximum water temperature is 60°C according to safety

device setting.

■ Always use materials that are compatible with the water used in the

system and with the materials used in the unit.

■ Ensure that components installed in the field piping can withstand

the water pressure and temperature.

■ Drain taps must be provided at all low points of the system to

permit complete drainage of the circuit during maintenance.

■ Air vents must be provided at all high points of the system. The

vents should be located at points that are easily accessible for

servicing. An automatic air purge is provided inside the unit. Check

that this air purge valve is not tightened too much so that

automatic release of air in the water circuit remains possible.

5.5.3 Checking the water volume and expansion vessel

pre-pressure

The unit is equipped with expansion vessel that has a

default pre-pressure of 1.5 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.

1. Check that the total water volume in the installation, excluding

the internal water volume of the unit, is at least 20L. Refer to 14

Technical specifications to find the total internal water volume of

the unit.

NOTE

■ In most applications this minimum water volume will

be satisfactory.

■ In critical processes or in rooms with a high heat load

though, extra water might be required.

■ When circulation in each space heating loop is controlled by

remotely controlled valves, it is important that this minimum water

volume is kept even if all the valves are closed.

2. Using the table below, determine if the expansion vessel

pre- pressure requires adjustment.

3. Using the table and instructions below, determine if the total

water volume in the installation is below the maximum allowed

water volume.

Installation

Water volume

height

5/7kW

≤58 L

5/7kW

＞58 L

difference(a)

10~16kW ≤88 L

10~16kW ＞88 L

Actions required:

• pre-pressure must be decreased,

calculate according to "Calculating

≤7 m

No pre-pressure adjustment

the pre-pressure of the expansion

vessel"

required.

• check if the water volume is lower

than maximum allowed water

volume (use graph below)

Actions required:

• Pre-pressure must be increased,

calculate according to "Calculating

>7 m

the pre-pressure of the expansion

Expansion vessel of

the unit too

vessel" below.

small for the installation.

•

Check if the water volume is lower

than maximum allowed water

volume (use graph below)

(a) Installation height difference: height difference (m) between the

highest point of the water circuit and the unit. If the unit is located

at the highest point of the installation, the installation height

should be 0 m.

Calculating pre-pressure of the expansion vessel

The pre-pressure (Pg) to be set depends on the maximum installation

height difference (H) and is calculated as follows:

Pg(bar)=(H(m)/10+0.3) bar

Checking the maximum allowed water volume

To determine the maximum allowed water volume in the entire circuit,

proceed as follows:

1. Determine the calculated pre-pressure (Pg) for the

corresponding maximum water volume using the graph below.

Kaysun KEM-12 DTN Seite 21

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