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6-1  Pipe size selection

Select the size of piping between the outdoor unit (refrigerant branch kit) and the BS unit and between the 
BS unit and indoor units (refrigerant branch kits) based on example connections 1 and 2 below and Tables 
3 through 5.

Example connection 1 : When connecting 1 indoor unit downstream of the BS unit

Upstream

Downstream

Downstream

Indoor unit

BS unit

Suction gas pipe

HP/LP gas pipe

Liquid pipe

Liquid pipe

Gas pipe

To outdoor unit 

or refrigerant 

branch kit

Table 5

Select a size from Table 3 based on the 

total capacity of the indoor units to be 

connected downstream. 

Select a size from Table 4 based on the 

indoor unit capacity type.

Example connection 2 : When there is a branch downstream from the BS unit

Select a size from Table 3 
based on the total capacity 
of the indoor units to be 
connected downstream. 

Refer to the installation manual 
included with the outdoor unit or the 
equipment design materials to deter-
mine the size of the pipes between the 
BS unit and the refrigerant branch kits 
and between the refrigerant branch 
kits and indoor units.

Upstream

Suction gas pipe

HP/LP gas pipe

Liquid pipe

BS unit

Downstream

Indoor unit

Indoor unit

Indoor unit

Refrigerant branch kit

Liquid pipe

Gas pipe

Table 5

To outdoor unit 

or refrigerant 

branch kit

Table 3  Total indoor unit capacity and pipe size 

Unit: mm

Total indoor unit capacity 

(Q)

Pipe size (outside diameter × minimum thickness)

Upstream

Downstream

Suction pipe

HP/LP gas pipe

Liquid pipe

Gas pipe

Liquid pipe

Q < 150

ϕ

15.9 

×

 1.0

ϕ

12.7 

×

 0.8

ϕ

9.5 

×

 0.8

ϕ

15.9 

×

 1.0

ϕ

9.5 

×

 0.8

150 ≤ Q < 200

ϕ

19.1 

×

 1.0

ϕ

15.9 

×

 1.0

ϕ

19.1 

×

 1.0

200 ≤ Q < 290

ϕ

22.2 

×

 1.0

ϕ

19.1 

×

 1.0

ϕ

22.2 

×

 1.0

290 ≤ Q < 420

ϕ

28.6 

×

 1.0

ϕ

12.7 

×

 0.8

420 ≤ Q < 640

ϕ

28.6 

×

 1.0

ϕ

15.9 

×

 1.0

640 ≤ Q ≤ 750

ϕ

34.9 

×

 1.2

ϕ

19.1 

×

 1.0

• 

In case of connection to the main pipe, refer to the installation manual included with the outdoor unit or 
the equipment design materials.

Table 4  Indoor unit connection pipe size 

Unit: mm

Indoor unit capacity type

Pipe size (outside diameter × minimum thickness)

Gas pipe

Liquid pipe

20, 25, 32, 40, 50

ϕ

12.7 

×

 0.80

ϕ

6.4 

×

 0.80

63, 80, 100, 125

ϕ

15.9

×

 1.0

ϕ

9.5 

×

 0.80

200

ϕ

19.1 

×

 1.0

250

ϕ

22.2 

×

 1.0

01_EN_3P194121-8U.indd   8

2/21/2014   3:31:07 PM

Summary of Contents for BS4Q14AV1

Page 1: ...ANTES DE INSTALAR GUARDE ESTE MANUAL EN UN LUGAR A MANO PARA LEER EN CASO DE TENER ALGUNA DUDA PRIMA DELL INSTALLAZIONE LEGGERE ATTENTAMENTE QUESTE ISTRUZIONI TENERE QUESTO MANUALE A PORTATA DI MANO P...

Page 2: ...ay result in minor or moderate injury It may also be used to alert against unsafe practices WARNING Ask your local dealer or qualified personnel to carry out installation work Improper installation ma...

Page 3: ...fter completing the installation work check to make sure that there is no leakage of refrigerant gas Toxic gas may be produced if refrigerant gas leaks into the room and comes into contact with a sour...

Page 4: ...that the following accessories have been included in the packaging Important Do not throw away any accessories that may be needed in installation work until installation is complete Name Accessory pip...

Page 5: ...ta book Example selection In case of the BS unit with connect a FXCQ32M and a FXSQ40M Total capacity 31 25 40 71 25 2 4 Checklist Exercise particular care concerning the following items during install...

Page 6: ...unit 450 450 70 300 or more 500 or more 1 450 2 Control box 100 or more 3 100 or more Drain pan Maintenance space Control box and motorized valve coil Maintenance space Indoor unit side pipe 1 Unit m...

Page 7: ...ion pipe All the above parts must be supplied in the field Example installation 5 BS UNIT INSTALLATION Use only accessories and parts that conform to the designated specifications when installing the...

Page 8: ...nd included with the outdoor unit Before beginning the work be sure to verify that the type of refrigerant used is R410A The unit will not operate correctly with a different type of refrigerant Insula...

Page 9: ...of the pipes between the BS unit and the refrigerant branch kits and between the refrigerant branch kits and indoor units Upstream Suction gas pipe HP LP gas pipe Liquid pipe BS unit Downstream Indoo...

Page 10: ...new units Be sure to use the stop valve kit for extension KHFP26M224 sold separately for pipe that you plan to expand in the future Do not size pipe based on anticipated future expansion Instead reex...

Page 11: ...cut and connect as it is In case of others cut the outlet pipe and connect to the connecting pipe In accordance with the following instructions Cutting point Center of connection area Connect Local pi...

Page 12: ...and gas piping so use insulation that can withstand more than 120 C When reinforcing the insulation material in accordance with the installation environment also reinforce the insulation on the pipin...

Page 13: ...ulation material with the seam facing up Refer to Fig 3 7 DRAIN PIPING WORK 1 Drain piping work Install drain piping so that wastewater drains reliably Use a pipe diameter that is the same as or great...

Page 14: ...terval of 1 to 1 5 m so that the pipe does not droop Refer to Fig 4 Metal clamp 5 Sealing material 6 Accessories Accessories Drain hoses 4 Accessories To prevent condensation do not leave any gap Fig...

Page 15: ...nit body to wire the outdoor unit and indoor units Properly connect wire of the specified wire type and copper thickness Also use the included clamp to avoid applying excessive force to the terminal f...

Page 16: ...se insulated wire for the power cord Select the power supply cable type and size in accordance with relevant local and national regulations Specifications for local wiring are in compliance with IEC60...

Page 17: ...unit Note 1 Indoor unit A Indoor unit B 1 Indoor unit B 2 Note 3 Indoor unit C Note 2 Indoor unit Indoor unit OUT OUT OUT IN Never connect to power supply wiring When joining branch pipes Indoor unit...

Page 18: ...external force Use an appropriately sized screwdriver to tighten the terminal screws Use of a screwdriver that is too small could damage the screw head and prevent proper tightening Overtightening th...

Page 19: ...subject to tensile force Bundle transmission wiring together Clamps 2 Accessories Transmission wiring Remove the control box cover and connect the wires to the transmission wiring terminals outdoor un...

Page 20: ...hen fastening the wire use the included clamp 2 so as not to apply tensile force to the wire connec tion and then securely fasten the wire Also after the wiring is completed organize the wiring so tha...

Page 21: ...P Piping branch port number Terminal No to which to connect transmission wiring DIP switch Setting 1 Setting for branch ports to which no indoor unit is connected Setting Setting for branch ports to w...

Page 22: ...ional charge of refrigerant 11 CHECK OPERATION AND TEST OPERATION 1 Verify that the control box cover is closed 2 Refer to the installation manual included with the outdoor unit and conduct a check an...

Page 23: ...3P194121 8U EM13A025A 1402 HT 00_CV_3P194121 8U indd 2 2 15 2014 3 47 51 PM...

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