22
English
9
7
8
5
3
4
1
2
1
3
Note:
Do not allow the power wire
to come into contact with
the port pipe.
6
1
Compressor wiring
1
Power/ground wires
6
Clamp (3) (accessory)
2
Clear over 2 in. (50 mm)
7
Power wiring
3
Transmission wiring
8
Ground wire
4
Clamp (1) (accessory)
9
Port pipes
5
Clamp (2) (accessory)
NOTE
Do not touch the port pipes during wiring work. Damages of pipes may
cause refrigerant leak.
Precautions when knocking out knockout holes
• To punch out a knockout hole, hit it with a hammer.
• Open an appropriate hole as needed.
• After knocking out the holes, trim off the burr, then we recommend
you to paint the edges and areas around the edges using the repair
paint to prevent rusting.
• Power line: Open a knockout hole as shown at right and connect it
using a conduit.
Choose an appropriate knockout hole for conduit size suitable for
the power and ground line to be used.
• Transmission line: Connect it using a conduit in the knockout hole
on the left.
Knockout hole (Transmission line)
f
7/8 in. (22.2 mm)
Knockout hole (Power line)
Burr
f
7/8 in. (22.2 mm)
f
1-1/8 in. (27.8 mm)
f
1-3/8 in. (34.5 mm)
NOTE
After wiring work is completed, check to make sure there are no loose
connections among the electrical parts in the control box.
10. Air tight test and vacuum drying
•
After finished piping work, carry out air tight test and vacuum drying.
NOTE
• Always use nitrogen gas for the air tightness test.
• Absolutely do not open the stop valve until the main power circuit
insulation measurement has been completed. (Measuring after the
stop valve is opened will cause the insulation value to drop.)
<Needed tools>
Gauge manifold
Charge hose
valve
• To prevent entry of any impurities and insure
sufficient pressure resistance, always use the
special tools dedicated for R410A.
• Use charge hose that have pushing stick for con-
necting to service port of stop valves.
Vacuum pump • The vacuum pump for vacuum drying should be
able to lower the pressure to 500 microns.
•
Take care the pump oil never flow backward into
the refrigerant pipe during the pump stops.
<The system for airtight test and vacuum drying>
•
Referring to the figure below, connect a nitrogen tank, refrigerant
tank, and a vacuum pump to the outdoor unit.
The refrigerant tank and the charge hose connection to service port
of all valves in the figure below are needed in
14. Charging refrigerant on page 26.
1
2
3
4
5
6
A
B
C
9
10
10
11
13
12
14
15
7
8
1 Pressure reducing valve
2 Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 High/low pressure gas pipe stop valve
8 Suction gas pipe stop valve
9 Liquid pipe stop valve
10 Outdoor unit
11 To Branch Selector unit (indoor unit)
12 Stop valve
13 Field piping
14
Gas flow
15 Stop valve service port
A Valve A
B Valve B
C Valve C
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03_EN_3P734038-1.indd 21
2023/05/29 10:20:14
2023/05/29 10:20:14
