Vacuuming And Charging - Daikin FDM75DXV1 Installation Manual

Air cooled, ducted split type air-conditioners (d & e series) r22 cooling only r407c cooling only r22 heatpump r407c heatpump

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Table Of Contents

Table of Contents

Vacuuming is necessary to eliminate all moisture and air from the system. The series II Outdoor Unit is provided with flare

valve fittings.

Vacuuming The Piping And The Indoor Unit

Except for the outdoor unit which is pre-charged with

refrigerant, 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. Confirm that the charging gauge needle has

moved towards -760mmHg.

Caution

•

If the gauge needle does not move to -760mmHg, be sure to

check for gas leaks (using the refrigerant detector) at flare

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 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.

•

R407C must be charged as liquid. Usually R407C cylinder is equipped with a dip-pipe for liquid withdrawal. If there

is no dip-pipe, the cylinder should be inverted so as to withdraw liquid R407C from the valve.

•

Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit thoroughly and then

charge the unit with fresh R407C according to the amount recommended in the speciﬁ cation.