Handleiding Kaysun Aquantia PRO Monobloc - KHP-MO (pagina 33 van 80) (Engels)

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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.

CAUTION

Selecting the additional expansion vessel

If the expansion vessel of the unit is too small for the

installation, an additional expansion vessel is needed.

calculate the pre-pressure of the expansion vessel:

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

the expansion vessel equipped in the unit should

adjust the pre- pressure also.

calculate the volume needed of the additional expan-

sion vessel:

V1=0.0693*Vwater/(2.5-Pg)-V0

Vwater is volume of water in the system, V0 is volume

of expansion vessel which the unit is equipped(8L).

9.4.3 Water circuit connection

Water connections must be made correctly in

accordance with labels on the outdoor unit, with respect

to the water inlet and water outlet.

Use clean pipes only.

Hold the pipe end downwards when removing burrs.

Cover the pipe end when inserting it through a wall to

prevent dust and dirt entering.

Use a good thread sealant for sealing the connec-

tions. The sealing must be able to withstand the

pressures and temperatures of the system.

When using non-copper metallic piping, be sure to

insulate two kind of materials from each other to

prevent galvanic corrosion.

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:

For copper is a soft material,

use appropriate tools for

connecting the water circuit.

Inappropriate tools will cause

damage to the pipes.

Pre-pressure = pre-pressure of the expansion vessel

Maximum water volume = maximum water volume in the

system

A1 System without glycol

A2 System without 25% propylene glycol

Example 1：

The unit is installed 5m below the highest point in the

water circuit. The total water volume in the water circuit is

100 L. In this example, no action or adjustment is

required.

Example 2：

The unit is installed at the highest point in the water

circuit. The total water volume in the water circuit is 250

Result:

Since 250 L is more than 230 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 310L.

Since the total water volume (250L) is below the

maximum water volume (310L), the expansion vessel

suffices for the installation.

Setting the pre-pressure of the expansion vessel

When it is required to change the default pre-pressure of

the expansion vessel (1.0 bar), 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.

Determine the calculated pre-pressure (Pg) for the

corresponding maximum water volume using the

graph below.

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.

NOTE

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.

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:

0.3

0.8

1.3

1.8

2.3

2.8

3.3

0 50 100 150 200 250 300 350

Pre-pressure [bar]

Max. water volume [L]

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