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Table 4 Branch/Header Tube Selection
Use the following branch tubing sets or tubing sets for branching the system's main tube and indoor unit
tubing.
Gas tube (mm)
φ31.75
Over 72.8 kW
φ28.58
Over 45.0 kW to 72.8 kW
φ28.58
Over 35.5 kW to 45.0 kW
φ25.4
Over 28.0 kW to 35.5 kW
φ22.22
Over 22.4 kW to 28.0 kW
φ19.05
Over 16.0 kW to 22.4 kW
φ15.88
Over 5.6 kW to 16.0 kW
φ12.7
5.6 kW or below
(*1)
Make a selection so as not to exceed the main tubing size.
Even when 5.6 kW or below, make the gas tube diameter φ15.88 if 2 or more indoor units are connected after
(*2)
branching.
(*3)
As the tube diameter for the supplied reducer does not match, another reducer must be provided by the installer.
Table 5 Tubes Connecting Outdoor Units and Indoor Units
Tubing connecting to
outdoor units (ℓA to ℓB)
Tube size
Tubing
connecting to
Unit type
indoor units
(ℓ1 to ℓ48)
Gas tube (mm)
Tube size
Liquid tube (mm)
Note: Keep the maximum length between ℓ1 to ℓ48 within 30 m.
Gas trip-valve kit (SGP-VK32K)
As shown in Fig. 6, install the gas trip-valve kit between the outdoor unit and the refrigerant gas tube (wide) of
the main tubing.
* Refer to "7. USING A VIBRATION-RESISTANT FRAME" when using a vibration-resistant frame.
Main tubing
Liquid tube (narrow)
Gas tube (wide)
Branch tube size
(*1)
Liquid tube (mm)
APR-P160BG
φ19.05
φ15.88
φ12.7
φ12.7
φ 9.52
φ 9.52
φ 9.52
φ 9.52
(*2)
Unit type
35.5 kW
φ25.4
Gas tube (mm)
Liquid tube (mm)
Balance tube (mm)
28
36
45
56
φ12.7
φ6.35
Tubing anchor
Gas trip-valve kit
SGP-VK32K (purchased separately)
Fig. 6
GB - 7
Branch tube number
Branch tubing
APR-P680BG
―
―
―
●
―
●
―
●
―
●
●
●
●
●
(*3)
●
●
(*3)
45.0 kW
56.0 kW
φ28.58
φ12.7
φ9.52
71
80
90
112
140
φ15.88
φ9.52
Balance tube
Tubing anchor
APR-P1350BG
●
●
●
●
●
●
●
(*3)
●
(*3)
71.0 kW
φ15.88
160
224
280
φ22.22
φ25.4
φ12.7
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