Charging Additional Refrigerant - Technibel CAV250R5TA Série Manuel D'installation

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CAUTION

• Be sure to use a manifold valve for air purging. The

"Lo" knob of the manifold valve must always be kept

closed.

(3)

Pressurized the system to no more than 30 kg/cm

with dry nitrogen gas and close the cylinder valve when

the gauge reading reaches 30 kg/cm

Then, test for leaks with liquid soap.

CAUTION

• To avoid nitrogen entering the refrigerant system in a

liquid state, the top of the cylinder must be higher than

its bottom when you pressurize the system.

Usually, the cylinder is used in a vertical standing po-

sition. (Refer to the previous page).

(4)

Do a leak test of all joints of the tubing (both indoor

and outdoor) and both wide and narrow service valves.

Bubbles indicate a leak. Be sure to wipe of the soap

with a clean cloth after a leak test.

(5)

After the system is found to be free of leaks, relieve the

nitrogen pressure by opening the "Lo" knob of the

manifold valve. When the system pressure is reduced

to normal, disconnect the hose from the cylinder.

Evacuation

(1)

Attach the charge hose to the low side end and to the

vacuum pump. Close the "Hi" knob of the manifold

valve.

Confirm that the "Lo" knob of the manifold valve is

open. Then, run the vacuum pump. The operation time

for evacuation varies with the tubing length and capacity

of the pump. The following tables shows the amount

of time for evacuation:

Required time for evacuation

when 100 l/h vacuum pump is used

If tubing length is

less than 15 m

45 min. or more

NOTE

The required time in the above table is calculated based on

the assumption that the ideal (or target) vacuum condition is

around 10 mmHg abs.

(2)

When the desired vacuum is reached, close the "Lo"

knob of the manifold valve and stop the vacuum pump.