Manual Kaysun KEM-12 DTN (page 23 of 48) (English)

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WARNING

ETHYLENE GLYCOL AND PROPYLENE GLYCOL ARE TOXIC

a.The concentrations mentioned in the table above will not

prevent the medium freezing, but will prevent the hydraulics from

bursting.

b.The maximum allowed water volume is then reduced according to

the figure “Maxiumum allowed water volume” on Page 21 C.

CAUTION

Use of glycol

■ For installations with a domestic hot water tank, the use of

propylene glycol, including necessary inhibitors, is only

EN1717 or equivalent based on the applicable legislation.

■ in case of over-pressure when using glycol, be sure to connect the

safety valve to a drain pan in order to recover the glycol.

Connecting a drain pipe is not required if no glycol is used, the

discharged water is then drained via the bottom of the unit.

NOTE

Corrosion in the system due to glycol

Uninhibited glycol will turn acidic under the influence of oxygen.

This process is accelerated by presence of copper and at higher

temperatures. The acidic uninhibited glycol attacks metal surfaces

and forms galvanic corrosion cells that cause severe damage to the

system.

It is of extreme importance:

■ That the water treatment is correctly executed by a qualified

water specialist.

■ That a glycol with corrosion inhibitors is selected to counteract

acids formed by the oxidation of glycols.

■ That in case of an installation with a domestic hot water tank, only

the use of propylene glycol is allowed. In other installations

the use of ethylene glycol is fine.

■ That no automotive glycol is used because their corrosion

inhibitors have a limited lifetime and contain silicates that can

foul or plug the system;

■ That galvanized piping is not used in glycol systems since it may

lead to the precipitation of certain elements in the glycol’s

corrosion inhibitor;

■ To ensure that the glycol is compatible with the materials used in

the system.

NOTE

■ Be aware of the hygroscopic property of glycol. It

absorbs moisture from the environment.

■ Leaving the cap off the glycol container causes the

concentration of water to increase. The glycol

concentration is then lower and the water could freeze.

■ Preventive actions must be taken to ensure

minimal exposure of the glycol to air.

5.5.7 Fouling factors

The performance data given refer to conditions with clean

evaporator plates (fouling factor=1). For different fouling factors,

multiply the figures in the performance tables by the coefficient given

in the following table.

Fouling factors

Evaporator

(m2 °C/W)

capacity

compressor power

total power input

correction factor

input correction factor

correction factor

4.4 x 10-5

0.86 x 10-4

0.96

0.99

1.72 x10-4

0.93

0.98

5.5.8 Filling with water

1. Connect the water supply to the fill valve and open the valve.

2. Make sure the automatic air purge valve is open (at least 2 turns).

3. Fill with water until the manometer indicates a pressure of

approximately 2.0 bar. Remove air in the circuit as much as

possible using the air purge valves. Air present in the water circuit

might cause malfunctioning of the backup heater.

Do not fasten plastic cover

on the air purge valve at the

topside of the unit when the

system is running. Open air

purge valve, turn

anticlockwise at least 2 full

turns to release air from the

system.

NOTE

During filling, it might not be possible to remove all air in the

system. Remaining air will be removed through the automatic

air purge valves during the first operating hours of the

system. Topping up the water afterwards might be required.

■ The water pressure indicated on the manometer will vary

depending on the water temperature (higher pressure at

higher water temperature).

However, at all times water pressure should remain

above 0.3 bar to avoid air entering the circuit.

■ The unit might drain-off too much water through the

pressure relief valve.

■ Water quality must be according to "Safe Drinking

water Act "

5.5.9 Piping insulation

The complete water circuit including all piping, must be insulated to

prevent condensation during cooling operation and reduction of the

heating and cooling capacity as well as prevention of freezing of the

outside water piping during winter. The thickness of the sealing

materials must be at least 13 mm with λ= 0.039 W/mK in order to

prevent freezing on the outside water piping.

If the temperature is higher than 30°C and the humidity is higher than RH

80%, then the thickness of the sealing materials should be at least 20 mm

in order to avoid condensation on the surface of the seal.

5.6 Field wiring

WARNING

■ A main switch or other means of disconnection, having a contact

separation in all poles, must be incorporated in the fixed wiring in

accordance with relevant local laws and regulations.

■ Switch off the power supply before making any connections.

■ Use only copper wires.

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