Bedienungsanleitung REMKO KWE serie 150-180-220-250-300-320-370-440 (Seite 41 von 60) (Englisch)

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Minimum / maximum flow volume

The circulation pump of the chiller generates a

constant medium flow rate; the result is a loss of

pressure in the system and in the chiller

The differential pressure switch in the chiller meas-

ures the medium pressure loss over the evaporator

and switches the unit off if the flow rate drops

below the minimum medium volume.

The medium flow rate limit may likewise not be

exceeded (maximum flow volume).

A 3-way valve with bypass and a hydraulic com-

pensator to establish a primary and secondary cir-

cuit or a volume-dependent bypass are necessary

to ensure a constant medium flow rate.

Minimum medium volume, per unit

As a consequence of the adaptive controller a

storage tank is not mandatory. However, the flow

rate shall not drop below the minimum medium

volume in order to ensure trouble-free operation of

the unit.

NOTICE!

The product and safety data sheets of the

glycol type used must be observed during use

and disposal.

NOTICE!

Use the required type and mix ratio appropriate

for the application area to ensure the freezing

point.

To adjust the circulation pump, we recommend

that a main hydronic balancing valve is pro-

vided in the vicinity of the unit.

Medium piping

Medium piping can be made of copper, steel or

plastic. T

o minimise pressure losses, only stream-

lined fittings should be used.

When designing the layout, the large medium flow

rates in cold water systems, high pressure losses

in connection with water-glycol mixtures and the

chiller's minimum flow volume must be taken into

account.

The lines are to be insulated against vapour diffu-

sion and, if necessary, the current German Energy-

Savings-Ordinance (EnEV) must be observed. UV

resistance must be realised outdoors.

Pressure and temperature displays

The pressure and temperature displays to be

installed on-site at the intake and outlet serve to

set the medium flow rate. The display should be

able to be shut off.

Temperature sensors are located in the chiller's

medium inlet and outlet. Sensor values can be

queried via the controller.

Valves for hydronic balancing

The calculated individual pressure losses in the

pipeline network layout for each individual unit are

adjusted to the entire system with hydronic bal-

ancing valves to be provided by the customer. The

nominal flow rates for the medium adjust to the

values needed as a consequence of the pressure

loss.

Anti-freeze protection (accessories)

A water glycol mix is generally used as the medium

for a cold water system. Depending on the use to

which the glycol type and quantity is put, the vis-

cosity changes, the loss in pressure increases and

the unit's cooling or heating capacity reduces. All

system components must be approved for use with

glycol.

As a rule, the addition to the water of ethylene

glycol, in a proportion of 34%, with inhibitors for

corrosion protection is recommended. This con-

centration ensures anti-freeze protection to -20 °C;

at lower temperatures, an ice porridge forms which

has no explosive effect.

The toxicologically harmless propylene glycol

should be used if there is a risk that the medium

can come into contact with drinking water or food

stuffs. To inhibit the explosive effects, a proportion

of 38% is necessary as a rule.

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REMKO KWE serie 150-180-220-250-300-320-370-440 Seite 41

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