Bedienungsanleitung REMKO ML680 (Seite 18 von 24) (Englisch)

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Oil recirculation

If the outdoor unit is set up at a higher level than the in-

door unit, appropriate steps must be taken for oil recir-

culation.

This is usually accomplished by creating an oil elevation

arc that is installed every 2.5 meters of pipe going up.

Radius:

50 mm

Outdoor unit

max. 8/10 m

Indoor unit

Oil elevation arc in the suction pipe

to the outdoor unit

1x for every 2.5 meters of

pipe going up

A vacuum with a minimum of 0.05 mbar must be

created!

Prior to performing any work on the unit, it must

be unplugged from the power supply and secured

against being inadvertently switched on!

How long it takes to create the vacuum is based on the

hose line volume of the indoor unit and the length of the

refrigerant pipes. However, this process takes a mini-

mum of 30 minutes.

Once foreign gases and moisture have been completely

removed from the system, the manometer station

valves are closed and the valves of the outdoor unit are

opened as described in the "Initial Operation" section.

Impermeability Test

Once all connections have been made, the manometer

station is connected to the corresponding valve connec-

tions as described below:

red = small valve = injection pressure.

blue = large valve = suction pressure.

After the connection has been made, an impermeability

test is conducted using dry nitrogen.

The connections that have been established are

sprayed with a leak locator spray to test for imperme-

ability. Tighten the bolts more firmly or, if necessary,

create a new flare.

After this test has been successfully conducted, any ex-

cess pressure is removed from the refrigerant pipes and

a vacuum pump with an absolute final partial pressure

of at least 0.01 mbar is put into operation to create a

vacuum in the pipes. This also removes any moisture

from the pipes.

Electrical Connection

All electrical installations may only be performed by

authorised service centres in line with the relevant regula-

tions. Local guidelines for operation as well as the re-

quirements established by local energy supply compa-

nies must be observed for setup and initial operation.

The diameter of the power supply line is based on the

structural conditions and the power supply capacity of

the unit.

A power supply must be installed to the outdoor unit

and a 4-wire control line must be installed from the out-

door unit to the indoor unit.

We recommend using a shielded line with a diameter of

at least 1.5 mm² for the control lines.

Connecting the indoor unit

Prior to installing the connection, observe the following:

Power is supplied to the indoor unit via a control line

from the outdoor unit.

The system’s fuse protection must comply with the

technical data.

The terminals of the connections are located on the

right-hand side of the indoor unit.

Terminal

Cover

Strain relief

Control line

To connect the units, proceed as follows:

1. Open the air inlet grille.

2. Using a Phillips screwdriver, loosen the cover on the

right side.

3. Connect the unit to the current-free line from the

outer unit.

See Wiring Diagram.

4. Reassemble the unit.

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REMKO ML680 Seite 18

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