Manual Dimplex LAW 9IMR (page 40 of 100) (English, German, French)

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EN-14 452162.66.04 · FD 9912 www.gdts.one

English LAW 9IMR - LAW 14ITR

8.4 Leak test and evacuation

Air and moisture in the cooling system have unwanted effects

as outlined below.

1) The pressure in the system increases.

2) The operating current increases.

3) The cooling (or heating) output falls.

4) Moisture in the cooling circuit can freeze and block the

capillary tubes.

5) Water can cause corrosion on parts in the cooling

system.

This means that the indoor and outdoor unit, as well as the con-

nection pipe, must be checked for leaks and pumped empty to

remove any non-condensable gases and moisture from the

system.

8.4.1 Preparation

Ensure that each pipe (liquid and air side) between the indoor

and outdoor unit is connected correctly and the wiring for the

test operation has been carried out. Remove the maintenance

valve caps from both the gas and liquid side of the outdoor unit.

Ensure that both maintenance valves on the liquid and air side

of the outdoor unit are closed at this point.

8.4.2 Leak test

Connect the multi-way valve (with pressure gauges) and

dry nitrogen gas cylinder with the filling hoses on this

maintenance connection.

NOTE

A multi-way valve must be used for the leak test. If no multi-

way valve is available, an isolating valve can also be used. The

"Hi" lever on the 3-way valve must be closed at all times.

The system may be charged with max. 3.0 MPa dry nitro-

gen. The cylinder valve must be closed with a pressure of

3.0 MPa. The next step is to search for leaks with liquid

soap.

NOTE

In order to prevent liquid nitrogen from entering the cooling

system, the top side of the gas cylinder must be higher than

the bottom side when pressure is building in the system.

1) The gas cylinder is usually used in an upright position.

Check all pipe connections (indoor and outdoor) and main-

tenance valves of the air and liquid side for leaks. Bubbles

indicate a leak. The soap must be wiped away with a clean

cloth.

2) If no leaks are identified in the system, reduce the nitrogen

pressure by removing the filling hose connection from the

gas cylinder. When the system pressure is normal again,

the hose must be removed from the gas cylinder.

8.4.3 Evacuation

1) Connect the end of the filling hose mentioned above to the

vacuum pump to pump the pipework and indoor unit

empty. The levers "Lo" and "Hi" on the multi-way valve

must be open. Start the vacuum pump. The duration of the

pumping empty process varies with different lengths of

the pipework and the pump output. The following table

shows the time required for pumping empty.

2) Close the levers "Lo" and "Hi" on the multi-way valve at the

desired vacuum pressure and switch off the vacuum

pump.

Finally

1) Open the valve handle on the liquid side completely in an

anti-clockwise direction with a maintenance valve key.

2) Open the handle of the valve on the gas side completely in

an anti-clockwise direction.

3) Loosen the filling hose connected to the air side slightly

from the maintenance connection to reduce the pressure,

then remove the hose.

4) Tighten the screw nuts and caps on the air side mainte-

nance connection again with an adjustment key. This pro-

cess is very important to prevent leaks on the system.

5) Position the valve caps on the air and liquid side mainte-

nance valves again and tighten. The purging with the vac-

uum pump is complete. The split-heat pump is now ready

for test operation.

Siphon

TrapSiphon

Seal a small opening Seal a small opening

around the pipings

with gum type sealer.

Seal small gaps around

the pipe, e.g. with silicon.

Time required for pumping empty with a

0.11m_/hour vacuum pump

Length of the pipework

less than 10 m

Length of the pipework

more than 10 m

30 min. or longer 60 min. or longer

0.6 mbar or less

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Dimplex LAW 9IMR Manual

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