Bedienungsanleitung REMKO MVV 2000 DC Duo (Seite 27 von 68) (Englisch)

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6.2 Leak testing

Once all the connections have been made, the

pressure gauge station is attached to the Schrader

valve as follows (if fitted):

red = small valve = high pressure

blue = large valve = suction pressure

Once the connection has been made successfully

the leak test is carried out with dry nitrogen.

Leak testing involves spraying a leak detection

spray onto the connections. If bubbles are visible,

the connections have not been made properly. In

that case, tighten the connection or, if necessary,

create a new flange.

After completing a successful leak test, the excess

pressure in the refrigerant piping is removed and a

vacuum pump with an absolute final partial pres-

sure of min. 10 mbar is used to remove all of the

air and empty the pipes. Any moisture present in

the pipes will also be removed.

NOTICE!

A vacuum of at least 20 mbar must be pro-

duced!

The time required to generate the vacuum is

dependent on the final pressure pipe volume of the

indoor units and the length of the refrigerant piping.

However

, the process will take at least 60

minutes. Once any foreign gases and humidity

have been completely extracted from the system,

the valves on the pressure gauge station are

closed and the valves on the outdoor unit are

opened as described in the "Commissioning" sec-

tion.

6.3 Additional notes on connecting

the refrigerant piping

When combining the outdoor unit with the different

indoor units, the refrigerant piping connection may

differ. Install the corresponding expansion fittings

(sleeves) on the distributors. Depending on the

number of distributors and total length of the liquid

line, add refrigerant when commissioning the

system for the first time (see

Chapter

6.4 ‘Adding refrigerant’ on page 27).

6.4 Adding refrigerant

The unit contains a basic quantity of refrigerant.

Furthermore, an additional amount of refrigerant

must be added, in accordance with the following

table:

Component Fill factor

Length of the liquid pipe 1/4" 0.023 kg/m

Length of the liquid pipe 3/8" 0.060 kg/m

Number of distribution units (4-fold) 0.1 kg/unit

Number of Y-pieces 0.1 kg/unit

CAUTION!

ear protective clothing when handling refrig-

erant.

DANGER!

Only refrigerant in a liquid state may be used to

fill the cooling cycle!

NOTICE!

Check the overheating to determine the refrig-

erant fill quantity

NOTICE!

The escape of refrigerant contributes to climatic

change. In the event of escape, refrigerant with

a low greenhouse potential has a lesser impact

on global warming than those with a high

greenhouse potential. This device contains

refrigerant with a greenhouse potential of 1975.

That means the escape of 1 kg of this refrig-

erant has an ef

fect on global warming that is

1975 times greater than 1 kg CO

, based on

100 years. Do not conduct any work on the

refrigerant circuit or dismantle the device -

always enlist the help of qualified experts.

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