Vacuuming And Charging - Daikin FTXK09P Manuel D'installation

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SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

R410A is a new HFC refrigerant which does not damage

the ozone layer. The working pressure of this new refriger-

ant is 1.6 times higher than conventional refrigerant (R22),

thus proper installation/servicing is essential.

• Never use refrigerant other than R410A in an air conditioner

which is designed to operate with R410A.

• POE or PVE oil is used as lubricant for R410A

compressor, which is different from the mineral oil used

for R22 compressor. During installation or servicing, extra

precaution must be taken not to expose the R410A system

too long to moist air. Residual POE or PVE oil in the

piping and components can absorb moisture from the air.

• To prevent mischarging, the diameter of the service port on

the ﬂ are valve is different from that of R22.

Vacuuming is necessary to eliminate all moisture and air from the system.

Vacuuming The Piping And The Indoor Unit

Except for the outdoor unit which is pre-charged with refri-

gerant, the indoor unit and the refrigerant connection pipes

must be air-purged because the air containing moisture that

remains in the refrigerant cycle may cause malfunction of

the compressor.

• Remove the caps from the valve and the service port.

• Connect the center of the charging gauge to the vacuum

pump.

• Connect the charging gauge to the service port of the

3-way valve.

• Start the vacuum pump. Evacuate for approximately 30

minutes. The evacuation time varies with different vacuum

pump capacity. Conﬁ rm that the charging gauge needle

has moved towards -14.7psi (-760mmHg).

Caution

• If the gauge needle does not move to -14.7psi (-760mmHg),

be sure to check for leakage at ﬂ are type connection of

the indoor and outdoor unit and repair the leak before

proceeding to the next step.

• Close the valve of the changing gauge and stop the vacuum

pump.

• On the outdoor unit, open the suction valve (3 way) and

liquid valve (2 way) (in anti-clockwise direction) with

5/32" (4mm) key for hexagon sacked screw.

Charge Operation

This operation must be done by using a gas cylinder and a

precise weighing machine. The additional charge is topped-

up into the outdoor unit using the suction valve via the

service port.

• Remove the service port cap.

• Connect the low pressure side of the charging gauge to the

suction service port center of the cylinder tank and close

the high pressure side of the gauge. Purge the air from the

service hose.

• Start the air conditioner unit.

• Open the gas cylinder and low pressure charging valve.

• When the required refrigerant quantity is pumped into the

unit, close the low pressure side and the gas cylinder valve.

• Disconnect the service hose from service port. Put back

the service port cap.

• Use tools and materials exclusively for refrigerant R410A.

Tools exclusively for R410A are manifold valve, charging

hose, pressure gauge, gas leak detector, ﬂ are tools, torque

wrench, vacuum pump and refrigerant cylinder.

• As an R410A air conditioner incurs higher pressure

than R22 units, it is essential to choose the copper pipes

correctly.

• If the refrigerant gas leakage occurs during installation/

servicing, be sure to ventilate fully. If the refrigerant gas

comes into contact with ﬁ re, a poisonous gas may occur.

• When installing or removing an air conditioner, do not

allow air or moisture to remain in the refrigerant cycle.