Refrigerant pipe installation
96
Installation
Pipe diameter
Flare dimension A (mm)
Flare shape
Min
Max
1/4" (6.35)
8.3
8.7
R0.4~0.8
A
45°
90
°
4
-+
3/8" (9.52)
12.0
12.4
1/2" (12.7)
15.4
15.8
5/8" (15.9)
18.6
19.1
3/4" (19)
22.9
23.3
After flared the pipe, the opening part must be seal by end cover or adhesive tape to avoid duct or
exogenous impurity come into the pipe.
5.2.7 Drill holes if the pipes need to pass the wall.
5.2.8 According to the field condition to bend the pipes so that it can pass the wall smoothly.
5.2.9 Bind and wrap the wire together with the insulated pipe if necessary.
5.2.10 Set the wall conduit
5.2.11 Set the supporter for the pipe.
5.2.12 Locate the pipe and fix it by supporter
For horizontal refrigerant pipe, the distance between supporters should not be exceed 1m.
For vertical refrigerant pipe, the distance between supporters should not be exceed 1.5m.
5.2.13 Connect the pipe to indoor unit and outdoor unit by using two spanners.
Be sure to use two spanners and proper torque to fasten the nut, too large torque will damage the
bellmouthing, and too small torque may cause leakage. Refer the following table for different pipe
connection.
Pipe Diameter
Torque
Sketch map
(kgf.cm)
(N.cm)
1/4" (6.35)
144~176
1420~1720
3/8" (9.52)
333~407
3270~3990
1/2" (12.7)
504~616
4950~6030
5/8" (15.9)
630~770
6180~7540
3/4" (19)
990~1210
9270~11860
5.3 For Units with Twins Function
5.3.1 Length and drop height permitted of the refrigerant piping
Note: Reduced length of the branching tube is the 0.5m of the equivalent length of the pipe.
Summary of Contents for U2MRS-12
Page 7: ...Service Space Indoor Units 13 3 Service Space 1000mm 1000mm 1000mm 1000m m...
Page 13: ...Field Wiring Indoor Units 19 9 Field Wiring...
Page 20: ...Wiring Diagrams 26 Indoor Units 4 Wiring Diagrams 12K 12K 24K 30K 36K...
Page 21: ...Wiring Diagrams Indoor Units 27 MTB 24HWDN1 QRC4...
Page 28: ...Field Wiring 34 Indoor Units 10 Field Wiring 12K 18K 24K 30K 36K...
Page 32: ...Service Space 38 Indoor Units 3 Service Space...
Page 34: ...Wiring Diagrams 40 Indoor Units 36K...
Page 37: ...Indoor Units 43 9 Field Wiring...
Page 40: ...Dimensions 46 Indoor Units 2 Dimensions...
Page 41: ...Service Space Indoor Units 47 3 Service Space...
Page 42: ...Wiring Diagrams 48 Indoor Units 4 Wiring Diagrams 12K 18K...
Page 46: ...52 Indoor Units 10 Field Wiring 12K 18K...
Page 48: ......
Page 51: ...Dimensions Console Type 57 2 Dimensions MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...
Page 52: ...Service Space 58 Console Type 3 Service Space...
Page 53: ...Wiring Diagrams Console Type 59 4 Wiring Diagrams MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...
Page 58: ...Field Wiring 64 Console Type 10 Field Wiring MFAU 12HRFN1 QRC8 MFA 16HRFN1 QRC8...
Page 64: ...Wiring Diagrams 70 Outdoor Units 4 Wiring Diagrams U2MRS 12...
Page 65: ...Wiring Diagrams Outdoor Units 71 18K 24K 30K 36K...
Page 66: ...Wiring Diagrams 72 Outdoor Units...
Page 67: ...Wiring Diagrams Outdoor Units 73...
Page 92: ...Refrigerant pipe installation 98 Installation...
Page 123: ...Troubleshooting Electrical Control System 129 2 4 1 2 Outdoor unit malfunction...
Page 130: ...Troubleshooting 136 Electrical Control System 2 4 2 3 Up down panel is not closed...
Page 134: ...Troubleshooting 140 Electrical Control System 2 4 4 3 E3 malfunction...
Page 135: ...Troubleshooting Electrical Control System 141 2 4 4 4 E4 malfunction...
Page 141: ...Troubleshooting Electrical Control System 147 2 4 4 9 P1 malfunction For 36k models...
Page 142: ...Troubleshooting 148 Electrical Control System 2 4 4 10 P2 malfunction For 36k models...
Page 143: ...Troubleshooting Electrical Control System 149 2 4 4 11 P3 malfunction...