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BU Module
13
Install the optional piping adapters to the BU module, so that the piping connection size of BU
module can match with that of the outdoor unit and indoor units.
1) Piping adapter(Optional accessories)
Table 9
NO. Name
Port A
(mm/inch)
Port B
(mm/inch)
1 Φ15.9→Φ19.05 Φ15.9(5/8) Φ19.05(3/4)
2 Φ9.52→Φ12.7 Φ9.52(3/8) Φ12.7(1/2)
3 Φ9.52→Φ15.9 Φ9.52(3/8) Φ15.9(5/8)
4 Φ6.35→Φ9.52 Φ6.35(1/4) Φ9.52(3/4)
Fig. 16
2) Install the piping adapter
① Refer to the piping connection size of the outdoor unit and indoor units, the appropriate piping
adapter should be adopted.
② Align the flared end of copper tube with the center of pipe joint. Tighten the nuts with hands.
Then tighten the flaring nuts with torque wrench until you hear a “click”.
Fig. 17
3) Sealing the unconnected port
If the port of BU module indoor side does not connected to one indoor unit, the port must be
sealed to prevent refrigerant leaks. Please tighten the copper flaring nuts to the unconnected port
with torque wrench until you hear a “click”.
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