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5.  REFRIGERANT PIPING WORK

• 

For instructions for installing piping between the outdoor unit and the Branch Selector unit, selecting a 
refrigerant branch kit, and installing piping between the refrigerant branch kit and indoor units, refer to 
the installation manual and 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.)

• 

Insulate all of the piping, including the liquid pipes, high/low pressure gas pipes, suction gas pipes, gas 
pipes, and the pipe connections for these.  
Not insulating these pipes could result in water leaks or burns. 

In particular, low-temperature gas flows in the high/low pressure gas piping during full cooling opera

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tion, so the same amount of insulation as used for the suction gas pipes is required. 

In addition, high-temperature gas flows in the high/low pressure gas piping and gas piping, so use 

insulation that can withstand more than 250°F (120°C).

• 

Select insulation material as necessary for the installation environment. 

For details, refer to the Engineering Data Book.

 

If you fail to do so, condensation could form on the surface of the insulation.

5-1  Pipe size selection

Select the size of piping between the outdoor unit (refrigerant branch kit) and the Branch Selector unit 

and between the Branch Selector unit and indoor units (refrigerant branch kits) based on example con

-

nections 1 and 2 below and Tables 3, 4 and 5.

Example connection 1 : When connecting 1 indoor unit downstream of the Branch Selector unit

Upstream

Downstream

Downstream

Indoor unit

Branch 

Selector unit

Liquid pipe

Suction gas pipe

High/low pressure 
gas 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 Branch Selector 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 
Branch Selector unit and the refriger-
ant branch kits and between the 
refrigerant branch kits and indoor units.

Upstream

Liquid pipe

Suction gas pipe

High/low pres-
sure gas pipe

Branch 

Selector unit

Downstream

Indoor unit

Indoor unit

Indoor unit

Refrigerant branch kit

Liquid pipe

Gas pipe

Table 5

To outdoor unit 

or refrigerant 

branch kit

6

3P405106-9 English

01_EN_3P405106-9.indb   6

3/27/2015   1:53:09 PM

Summary of Contents for VRV IV Series

Page 1: ...HIS MANUAL IN A HANDY PLACE FOR FUTURE REFERENCE LIRE SOIGNEUSEMENT CES INSTRUCTIONS AVANT L INSTALLATION CONSERVER CE MANUEL A PORTEE DE MAIN POUR REFERENCE ULTERIEURE LEA CUIDADOSAMENTE ESTAS INSTRU...

Page 2: ...onnel must carry out the installation work Installation must be done in accordance with this installation manual Improper installation could result in water leakage electric shock or fire When install...

Page 3: ...stallation only Outdoor units can be installed either outdoors or indoors This unit is for indoor use Do not install the air conditioner or heat pump in the fol lowing locations a Where a mineral oil...

Page 4: ...NSTALLATION SITE 4 3 PREPARATIONS BEFORE INSTALLATION 5 4 BRANCH SELECTOR UNIT INSTALLATION 5 5 REFRIGERANT PIPING WORK 6 6 ELECTRIC WIRING WORK 11 7 INITIAL SETTING 17 8 ADDING AN ADDITIONAL CHARGE O...

Page 5: ...Insulation tube 2 Vinyl tube 3 Quantity BS4Q54TVJ 23 pcs 4 pcs 4 pcs 1 pc BS6Q54TVJ 32 pcs 6 pcs 6 pcs BS8Q54TVJ 40 pcs 8 pcs 8 pcs BS10Q54TVJ 49 pcs 10 pcs 10 pcs BS12Q54TVJ 57 pcs 12 pcs 12 pcs Sha...

Page 6: ...42 48 54 72 96 Example selection In case of the Branch Selector unit with connect a FXFQ12P and a FXMQ18P Total capacity 12 18 30 1 4 Checklist Exercise particular care concerning the following items...

Page 7: ...0 or more 20 500 or more 1 18 450 2 Control box 4 100 or more 3 4 100 or more Control box and motorized valve coil Maintenance space Indoor unit side pipe 1 Unit in mm Fig 1 1 Leave enough space to co...

Page 8: ...rts that conform to the designated specifications when installing the unit 1 Position the Branch Selector unit and secure it temporarily in place Attach the hanging brackets to the suspension bolts as...

Page 9: ...t the size of piping between the outdoor unit refrigerant branch kit and the Branch Selector unit and between the Branch Selector unit and indoor units refrigerant branch kits based on example con nec...

Page 10: ...6 4 24 30 36 42 48 54 f5 8 f15 9 f3 8 f9 5 72 f3 4 f19 1 96 f7 8 f22 2 Table 5 lists Branch Selector unit connection pipe size Table 5 Branch Selector unit connection pipe size Outdoor unit side 1 Bra...

Page 11: ...a enough to feel a slight breeze on your cheek 2 Do not use flux when brazing the refrigerant pipe Use phosphor copper B Cu93P 710 795 ISO 3677 which does not require flux as the filler metal for braz...

Page 12: ...ng joint may be required field supply if the local pipe size does not suit on the pipe size of the Branch Selector unit Table 5 If there are branch ports left unused not connected to an indoor unit If...

Page 13: ...piping and gas piping so use insulation that can withstand more than 250 F 120 C When reinforcing the insulation material in accordance with the installation environment also reinforce the insulation...

Page 14: ...wire installation work Follow the WIRING DIAGRAM attached to the unit body to wire the outdoor unit and indoor units Properly connect wire of the specified wire type and copper thickness Also use the...

Page 15: ...rrent Use copper conductors only Use insulated wire for the power cord Select the power supply cable type and size in accordance with relevant local and national regulations Use vinyl cord with sheath...

Page 16: ...d 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 TO IN D UNIT Never connect to power supply wiring In case joining branch pipes Note 2 IN...

Page 17: ...ed screwdriver to tighten the terminal screws Use of a screwdriver that is too small could damage the screw head and prevent proper tightening Overtightening the terminal screws could damage the screw...

Page 18: ...the included clamps 1 to securely hold the wires For more information about how much insulation to strip off transmission wir ing refer to the following figure Transmission wiring 3 8 in 10 mm 2 in 50...

Page 19: ...e wire use the included clamp 1 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 that the control bo...

Page 20: ...D I J K L 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 po...

Page 21: ...N 1 Verify that the control box cover is closed 2 Refer to the installation manual included with the outdoor unit and conduct a check and a test run after all the work on the Branch Selector unit and...

Page 22: ...5151 San Felipe Suite 500 Houston TX 77056 3P405106 9 EM14A003A 1506 HT 00_CV_3P405106 9 indd 2 4 20 2015 3 08 14 PM...

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