Service manual

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5 REFRIGERATION PIPING WORK
5�1 Connection between Indoor and Outdoor Units
a. Wiring of the Power Cord
CAUTION
！
A breaker must be installed, capable of cutting off the power supply for the whole system�
1) Open the side plate.
2) Let the power cord go through the rubber ring.
3) Connect the power card to the terminals “L”, “N” and also the earthing bolt, and then connect the wiring terminals
“N(1),2,3” of the indoor unit to those of the outdoor unit correspondingly.
4) Fix the power cord with wire clips.
b. Capacity Level and Capacity Code of the Indoor and Outdoor Units
Capacity Level Capacity Code
Indoor Unit
09 25
12 35
18 50
21 60
24 71
Outdoor Unit
36 100
42 120
1) The outdoor unit with capacity level 36 can drive up to four sets of indoor units, while the outdoor unit 42 can
drive up to ve.
2) The sum of the capacity codes of the indoor units should be among 50%-150% of that of the outdoor unit.
c. Allowable Length and Height Fall of the Refrigerant Pipe
Allowable Length Refrigerant Pipe
36 42 36 42
Total Length(m) 70 80 L
1
+L
2
+L
3
+ L
4
L
1
+L
2
+L
3
+ L
4
+ L
5
Max. Length for Single Unit(m) 20 25 L
X
Max. installation
altitude
Outdoor unit and indoor unit 15 15 H1
Indoor unit and indoor unit 7.5 7.5 H2
Dimension of the Refrigerant Pipe of the Indoor Unit
unit:mm
Capacity Level of the Indoor Unit Gas Pipe Liquid Pipe
09,12 φ9.52 φ6.35
18 φ12.7 φ6.35
21,24 φ15.9 φ9.52
d. Piping between the Indoor and Outdoor Units
1) Refer to Fig.6 for the moments of torque for tightening screws.
2) Let the are end of the copper pipe point at the screw and then tighten the screw by hand.
3) After that, tighten the screw by the torque wrench unit it clatters.
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