Refrigerant Piping; Purging Air And Checking Gas Leakage - Daikin Siesta ATXC20DV1B Installation Manual

Table of Contents

CAUTION

1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)

2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)

3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.

Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.

Apply refrigeration oil to the inner surface of the flare.

Do not apply refrigeration oil to the outer surface.

Do not apply refrigeration oil to the flare nut to

avoid tightening with excessive torque.

1. Cautions on pipe handling

1) Protect the open end of the pipe against dust and moisture.

2) All pipe bends should be as gentle as possible.

Use a pipe bender for bending.

2. Selection of copper and heat insulation materials

When using commercial copper pipes and fittings, observe the following:

1) Insulation material: Polyethylene foam

Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/(mh

Choose heat insulation materials that will withstand this

temperature.

2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.

Piping size, mm (in)

Minimum bend radius

6.4 (1/4")

30mm or more

9.5 (3/8")

30mm or more

12.7 (1/2")

40mm or more

15.9 (5/8")

50mm or more

19.1 (3/4")

50mm or more

NOTICE

Do NOT exceed the unit's maximum working pressure (see "Max. Allowable Pressure" on the unit name plate).

PURGING AIR AND CHECKING GAS LEAKAGE

• When piping work is completed, it is necessary to purge the air and check for gas leakage

WARNING

1) Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.

2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.

3) R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.

4) Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum

pump or the unit.

• If using additional refrigerant, perform air purging from the refrigerant pipes and indoor

unit using a vacuum pump, then charge additional refrigerant.

• Use a hexagonal wrench (4mm) to operate the stop valve rod.

• All refrigerant pipe joints should be tightened with a torque wrench at the specified

tightening torque.