Bedienungsanleitung Kaysun KEM-12 DTN (Seite 17 von 48) (Englisch)

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5.4.3 Application 3

Space cooling and heating application with a standard controller (or optional wired controller) connected to the unit. Heating

is provided through floor heating loops and fan coil units. Cooling is provided through the fan coil units only.

9.1

FCU1

FCU2

FCUn

9.2

FHL1

FHL2

FHLn

1 outdoor unit

2 Y-shape filter

3 shut-off valve (field supply)

4 wired controller (optional)

5 non-return valve (field supply)

6 drain valve (field supply)

7 fill valve (field supply)

8 buffer tank (field supply)

9 balance tank (field supply)

9.1 air purge valve

9.2 drain valve

10 expansion vessel (field supply)

11 Pump 2: outside circulation pump (field supply)

12 collector (field supply)

13 mixing station (field supply, field control)

14 Motorised 2-way valve to shut off the floor heating loops during

cooling operation (field supply, field control)

15 by-pass valve (field supply)

FHL 1...

floor heating loop

FCU 1...

fan coil units

M1...n

motorised valve to control loop FHL1...3 (field supply)

T1…n

room thermostat (field supply)

NOTE

If the volume of balance tank (9) larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the

total volume of buffer tank and balance tank should larger than 30L.The drain valve (6) should be installed at the lowest position of the

system.

An independent backup heater can be selected and installed in the door, which can provide additional heating source and ensure better

performance of the system when the ambient temperature is low.

■ Mixing station

As the unit is mainly to provide middle-temperature and high-temperature water, when connecting floor heating, the need to increase the

mixing station (13) before the floor heating.

■ Pump operation and space heating and cooling

According to the season, the unit (1) will switch to either heating or cooling mode according to the temperature detected by the standard

controller (or optional wired controller (4)). When space heating/cooling is requested standard controller (or optional wired controller (4)), the

pump will start operating and the unit (1) will switch to heating mode/cooling mode. The unit (1) will operating to achieve the target cold/hot

water leaving temperature.

In the cooling mode. the motorized 2-way valve (14) will be set to closed to prevent cold water running through the floor heating loops (FHL).

CAUTION

When circulation in each fan coil units (FCU 1...3) is controlled by remotely controlled valves (M1...3), it is important to provide a

by-pass valve (15) to avoid the flow switch safety device from being activated. The pass-by valve should be selected as such that

at all time the minimum water flow. It is recommended to select a pressure difference controlled by-pass valve.

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Kaysun KEM-12 DTN Seite 17

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