Refrigeration Piping Work; Connection Between Indoor And Outdoor Units - Gree R410A Service Manual

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5 REFRIGERATION PIPING WORK

5.1 Connection between Indoor and Outdoor Units

a. Wiring of the Power Cord
CUATION
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
Indoor Unit
Outdoor Unit
Total capacity of the indoor units can be among 50%-150% of that of the outdoor unit.
1) The outdoor unit with capacity level 36 can drive up to four sets of indoor units, while the outdoor unit 42 can
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
Total Length(m)
Max. Length for Single Unit(m)
Max. installation
altitude
Capacity Level of the Indoor Unit
d. Piping between the Indoor and Outdoor Units
1) Refer to Fig.6 for the moments of torque for tightening screws.
3) After that, tighten the screw by the torque wrench unit it clatters.
50
Outdoor unit and indoor unit
Indoor unit and indoor unit
Dimension of the Refrigerant Pipe of the Indoor Unit
09,12
18
21,24
Capacity Level
09
12
18
21
24
36
42
Allowable Length
36 42
70 80 L +L
1
20 25
15 15
7.5 7.5
Gas Pipe
Capacity Code
25
35
50
60
71
100
120
Refrigerant Pipe
36 42
+L + L L +L +L + L + L
2 3 4 1 2 3 4 5
L
X
H1
H2
unit:mm
Liquid Pipe