Daikin BRC7E61W Service Manual download pdf (Page 43)

Field Piping and Wiring SiE25-110

34 Field Piping and Wiring

Precautions for Installation Work

Several dedicated tools are required for the installation work of R-407C models. Some of conventional tools can be used except tools

actually used to the installation work for R-22 models.

Tools

Tool name Work process / Usage Interchangeability with conventional tool

Pipe cutting

Interchangeable and can be used.

Interchangeable and can be used. (Be strictly sure that oil does

not flow in reverse to the unit during pump stop.)

Pipe flaring

Applying to flared section

Use dedicated ether oil, ester oil, alkyl-benzene oil or mixture of those oil.

Dedicated gauge is required due to high pressure.

Not required since charging work conducted with weighing scale.

Interchangeable and can be used.

Dedicated detector is required (Detector for R134a can be used).

For preventing refrigerant leakage and mixing of foreign matters,

dedicated charging hose is required.

Interchangeable and can be used.

Flare nut jointing

Pipe expanding in connection of pipe

Pipe bending

Oxidation proof for inside pipe

Refrigerant charging using

vacuum and operation check

Pipe brazing

Pipe cutter

Flaring tool

Refrigeration oil

Torque wrench

Pipe expander

Pipe bender

Nitrogen

Welder

Refrigerant

piping work

Air tight test

Gauge manifold

Charging hose

Charging cylinder

Weighing scale for

refrigerant charging

Gas leakage detector

Vacuum pump

From air tight test

to refrigerant

additional charging

Vacuum drying

Refrigerant additional charging

Gas leakage check

Since stricter caution should be necessary for R-407C to

prevent intrusion of foreign matters into the refrigerant piping

line, be sure to conduct N2 blowing when brazing is required.

Other than brazing, a stricter work control including pipe

covering and drying is required to prevent pipe from intrusion of

foreign matters.

Joint brazing

Charge R-407C from service port at liquid side stop value of

outdoor unit in liquid phase. At that time, conduct vacuum

drying using vacuum pump.

Refrigerant charging

Make sure to conduct air-tightness test.

Air-tightness test

Make sure to conduct chamfering (filing) at cut section, since a

large wall thickness of pipe results large burr. Be aware of no

cutting chips left inside pipe.

Apply appropriate amount of refrigeration oil on outer / inner

surface of flared section to prevent leakage. Make sure to

use synthetic oil (ether oil, ester oil, archi-benzene oil or

mixture of those oils) as refrigeration oil.

Conduct installation work for R-407C model following above mentioned piping work procedure. Otherwise, unit

may have trouble. Refer to the "Work execution and control for R-407C model" for the details on handling of R-407C,

installation works and tools.

Flaring

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Daikin BRC7E61W Service Manual Page 43

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