Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

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ESIE09-08A Test Operation
Test Operation 81
enter the pipe during work).
After evacuating the system for 2 hours, pressurize the system to 0.05 MPa (vacuum break) with nitrogen
gas and evacuate the system again using the vacuum pump for 1 hour to –100.7 kPa (vacuum drying). If
the system cannot be evacuated to –100.7 kPa within 2 hours, repeat the operation of vacuum break and
vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does not rise.
If the indoor unit is changed by another indoor unit, do the above described leaktest again.
1.3 Additional Refrigerant Charge

Refrigerant cannot be charged until field wiring has been completed.

Refrigerant may only be charged after performing the leak test and the vacuum drying (see above).

When charging a system, care shall be taken that its maximum permissible charge is never exceeded,
in view of the danger of liquid hammer.

Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the
appropriate refrigerant (R-410A) is charged for outdoor unit, use (R-134a) for indoor unit.

Refrigerant containers shall be opened slowly.

Always use protective gloves and protect your eyes when charging refrigerant.

When performing service on the unit requiring the refrigerant system to be opened, refrigerant must
be evacuated according to local regulations.

When the power is on, please close the front panel when leaving the unit.
To avoid compressor breakdown. Do not charge the refrigerant more than the specified amount.

This outdoor unit is factory charged with refrigerant and depending on pipe sizes and pipe lengths
some systems require additional charging of refrigerant.

In case re-charge is required, refer to the nameplate of the unit. The nameplate states the type of
refrigerant and necessary amount.
Precautions when recharging/adding R-410A & recharging R-134a
Be sure to charge the specified amount of refrigerant in liquid state to the liquid pipe.
Since this refrigerant is a mixed refrigerant, adding it in gas form may cause the refrigerant composition
to change, preventing normal operation.

Before charging, check whether the refrigerant cylinder is equipped with a siphon tube or not.

Filling using a cylinder with a syphon attached.

Remark for R-134a: Never recharge more than mentioned on factory name plate.
Charge the liquid
refrigerant with the cylinder
in upright position. Charge the liquid
refrigerant with the cylinder
in up-side-down position.