Bedienungsanleitung REMKO KWE serie 150-180-220-250-300-320-370-440 (Seite 24 von 60) (Englisch)

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3 Design and function

3.1 Unit description

In cooling mode, the unit (an air-cooled chiller)

takes heat out of the operating medium to be

cooled, water or a mixture of water and glycol,

within a closed medium cycle in the evaporator

(plate heat exchanger) and passes it on to the

closed cooling cycle.

As a consequence of the heat exchange, the

medium cools and the refrigerant in the cooling

cycle vaporises under low pressure. The gaseous

refrigerant enters an electric compressor (scroll

construction) which increases the pressure and the

temperature of the refrigerant.

The gaseous refrigerant is led into a finned con-

denser

, which, as a consequence of the heat

exchange, condenses the refrigerant under high

pressure to a liquid.

The air emerging at the condenser heats the envi-

ronment. The liquid refrigerant is fed by means of a

variable injector valve back to the evaporator

where the circuit begins again. In heating mode, a

chiller with heat pump functions (HP-function) can

take up heat from the ambient air in the finned con-

denser and pass it on to the operating medium. A

reversing valve switches the cooling cycle function.

A return temperature dependent, adaptive con-

troller, which ensures the unit's operation and all of

the safety functions, is used to control the cooling

or heating capacity. A potential-free contact pro-

vides for remote enabling.

The unit is designed for outdoor installation. Under

certain circumstances, it can also be used in

indoor areas.

The unit cooling cycle comprises an evaporator,

compressor, thermal injection valve, condenser,

condenser fan, fan control system and high and

low pressure switches. Units with heat pump func-

tion also have a reversing valve and a collecting

flask.

The medium cycle comprises a circulation pump,

expansion vessel, safety valve and differential

pressure switch.

A storage tank is not mandatory.

Winter pressure controls, cabled remote control,

crankcase heating, vibration dampers, heaters for

anti-freeze protection, external medium storage

tanks, glycol concentrate and a technical assis-

tance commissioning are available as accessories.

3.2 System layout

The unit is designed for a 2-conductor system.

The system has 2 medium pipes (conductors:

Supply and return flow) for cooling using a cold

medium. In combination with a corresponding

system, the output can be transmitted to the room

to be cooled via the floor, the building structure or

by means of ceiling cooling. For each of the dif-

ferent systems, a minimum flow volume and a min-

imum medium volume must be ensured for the

plant.

1 1

1c1b

B3B2

Fig. 3: System layout

A: Outdoor area

B1-3: Indoor area 1,2,3

1: Cold water drain

1a: Infrared remote control

1b: Room temperature controller

1c: Cabled remote control

2: Chiller

3: Condensate drainage line

3a: Condensate drainage line

(only units with HP-function)

4: Condensate collecting drainage

5: Medium outlet

6: Medium inlet

REMKO KWE

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