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CAUTION

CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
“Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filter metal 
(BCuP) which does not require flux.”
(Flux has an extremely negative effect on refrigerant piping systems. For instance, if chlorine based flux is 
used, it will cause pipe corrosion. If the flux contains fluorine, it will damage the refrigerant oil.)

When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution 
(NOTE 1) or while inserting nitrogen into the refrigerant piping (NOTE 2). Once this is done, connect the 
indoor unit with a flared or a flanged connection.

DANGER

Use of oxygen may cause an explosion resulting in serious injury or death. Only use nitrogen gas.

NOTE

1.

Refer to the “Manual for Multi Installation for Buildings” for directions on how to carry out nitrogen 
substitution. (Inquire with your dealer.)

2.

Nitrogen should be set to 2.9 psi with a pressure-reducing valve if brazing while inserting nitrogen into the 
piping. 

(Refer to Fig. 14)

After checking for gas leaks, be sure to insulate the pipe connections using the supplementary piping 
insulation tubing and insulating tape (4). The insulating tape (4) should be wrapped from the L-shaped bend 
all the way to the end inside the unit.

 (Refer to Fig. 15)

CAUTION

Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping 
may cause condensate or burns if touched.

Refrigerant piping

Part to be 
brazed

Taping

Pressure-reducing valve

hands valve

Nitrogen

Fig. 14

Nitrogen

Insulating tubing tape

Insulating tubing tape

Local piping

Indoor unit piping

Indoor unit piping insulation tubing

Clamping material large 
(accessory) (5)

Insulating tape (accessory) (4)

L-shaped 
bend

Start wrapping

See “ 4.INDOOR UNIT 
INSTALLATION ”

Indoor unit piping insulation tubing

Insulating tubing tape

Insulation tubing seam

Attach the insulation tubing 
tape so that there are no gaps 
in the insulation tubing seam.

Fig. 15

01_EN_3PN07521-1.fm  Page 12  Monday, June 19, 2006  5:05 PM

Summary of Contents for FXAQ07MVJU

Page 1: ...4MVJU INSTALLATION MANUAL Read these instructions carefully before installation Keep this manual in a handy place for future reference This manual should be left with the equipment owner SYSTEM Invert...

Page 2: ...n how to operate the unit and keep it maintained Also inform customers that they should store this installation manual along with the operation manual for future reference This air conditioner comes u...

Page 3: ...ater leakage electric shocks or fire Be sure to use only the specified accessories and parts for installation work Failure to use the specified parts may result in water leakage electric shocks fire o...

Page 4: ...electrical parts can cause malfunctions smoke or fire Please instruct the customer to keep the area around the unit clean NOTE Install the indoor and outdoor units power supply wiring and connecting...

Page 5: ...r is suitable for installation in a commercial and light industrial environment If installed as a household appliance it could cause electromagnetic interference WARNING Entrust installation to the pl...

Page 6: ...s the air passage Where condensate can be properly drained Items to be checked If not properly done what is likely to occur Check Are the indoor and outdoor unit fixed firmly The units may drop vibrat...

Page 7: ...fore proceeding with the installation Also reinforce the place to prevent vibration and noise before installing The installation pitch can be found on the paper pattern for installation 3 so refer to...

Page 8: ...at least a 3 1 2 gap between the ceiling and the main unit b Temporarily attach the installation panel 1 at the temporary securing position on the paper pattern for installation 3 and use a level to m...

Page 9: ...and back left piping Remove the front grill Refer to Fig 7 How to remove the front grill Remove the front grill as described below when securing the indoor unit with screws or when attaching Optional...

Page 10: ...e refrigerant piping to the wall 7 Pass power supply wiring and ground wiring threaded through conduit For connecting the con duit to the unit see 8 1 HOW TO CONNECT WIRINGS and remote controller wiri...

Page 11: ...p to approximately 250 F so use insulation which is sufficiently resistant Also in cases where the temperature and humidity of the refrigerant piping sections might exceed 86 F or RH80 reinforce the r...

Page 12: ...nt to leak Use the flare nut included with the unit Refer to Table 1 for tightening torque Table 1 Not recommended but in case of emergency You must use a torque wrench but if you are obliged to insta...

Page 13: ...ould be set to 2 9 psi with a pressure reducing valve if brazing while inserting nitrogen into the piping Refer to Fig 14 After checking for gas leaks be sure to insulate the pipe connections using th...

Page 14: ...eter of drain piping which adapts to the capacity of the unit connected 2 Make sure the drain works properly After drain work is complete perform a drain check by opening the front panel removing the...

Page 15: ...it for the size of power supply wiring connected to the outdoor unit the capacity of the circuit breaker and switch and wiring instructions Be sure to ground the air conditioner DANGER Do not ground u...

Page 16: ...22 Transmission wiring and remote controller wiring Unscrew and remove the service lid Thread the remote controller wiring and transmission wiring through the included insulating tube long 7 and secur...

Page 17: ...oller wiring and transmission wiring between the units and other electrical wir ing do not pass through the same locations outside the unit separating them by at least 5 otherwise elec trical noise ex...

Page 18: ...e terminal screws 3 Do not connect wires of different gauge to the same ground terminal Looseness in the connection may lessen protection 4 Keep transmission wiring at least 5 away from power supply w...

Page 19: ...D OUT D F1 F2 F1 F2 Control box P1 P2 P1 P2 F1 F2 T1 T2 P1 P2 F1 F2 T1 T2 P1 P2 F1 F2 T1 T2 P1 P2 F1 F2 T1 T2 P1 P2 P1 P2 Outdoor unit No 2 System Indoor unit A Indoor unit B Indoor unit C Most downst...

Page 20: ...other remote controller set to M Refer to Fig 29 Wiring Method See 7 ELECTRIC WIRING WORK 3 Remove the service lid 4 Add remote control 2 slave to the terminal block 6P for remote controller P1 P2 in...

Page 21: ...NO and SECOND CODE NO Refer to the installation manual attached to the remote controller The Field Settings included with the remote controller lists the order of the settings and method of oper ation...

Page 22: ...onding trouble is provided in the installation manual of the outdoor unit If any of the items in Table 5 are displayed there may be a problem with the wiring or power so check the wiring again Table 5...

Page 23: ...0609 HT 3PN07521 1 EM04A013B 00_CV_3PN07521 1 fm Page 2 Monday June 19 2006 2 30 PM...

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