Daikin BRC1E51A7 Installation Manual download pdf (Page 12)

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6. REFRIGERANT PIPING WORK

〈For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉

〈Execute thermal insulation work completely on both sides of the gas piping and the liquid piping. Otherwise,

a water leakage can result sometimes.〉

(When using a heat pump, the temperature of the gas piping can reach up to approximately 120°C, so use

insulation which is sufficiently resistant.)

〈Be sure to check the type of R410A refrigerant to be used before doing any work. (Using an incorrect refrig-

erant will prevent normal operation of the unit.)〉

CAUTION

• Use a pipe cutter and flare suitable for the type of R410A refrigerant.

• Apply ester oil or ether oil around the flare section before connecting.

• Use the flare nut provided to the unit. Do not use a different flare nut (class 1), or otherwise refrigerant

leakage may result.

• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or cover

it with tape.

•

Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such

as air, etc. If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.

• The outdoor unit is charged with refrigerant.

• Be sure to use both a spanner and torque wrench together, as shown in the

drawing, when connecting or disconnecting pipes to/from the unit.

(Refer to Fig. 15)

• Refer to “Table 3” for the dimensions of flare nut spaces.

• Use the flare nut included with the unit main body.

• When connecting the flare nut, apply ester oil or ether oil to the

inside of the flare section, and spin 3-4 times before screwing in.

(Refer to Fig. 16)

CAUTION

• Overtightening may damage the flare and cause a refrigerant leakage.

• Do not let oil get on the screw holders on the dressing board. Oil can weaken the screw holders.

Ta bl e 3

CAUTION

• Be careful not to damage the flare section.

• Refer to “Table 3” to determine the proper tightening torque.

Pipe size Tightening torque

Flare dimensions

A (mm)

Flare

φ 9.5 (3/8”) 32.7 – 39.9 N·m 12.8 – 13.2

φ 15.9 (5/8”) 61.8 – 75.4 N·m 19.3 – 19.7

To rque wrench

Spanner

Pipe union

Flare nut

Fig. 15

Coat here with ester or ether oil.

Fig. 16

R0.4-0.8

90°±2°

45°±2°

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

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Daikin BRC1E51A7 Installation Manual Page 12

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