Midea MFA-76CRN1, Technical Manual

Page: 139 / 166

R410A Tropical Split Type Technical Manual Installation of Connective Pipe
Installation
139
b. Pull the pipe into the rear flare of the connective nut.
Fig-29
•
Tighten the nut
Align with the connective pipe
Screw up the connection pipe nut manually, and use a spanner to tighten it as shown in Fig-38
Fig-30
NOTE:
According to the installation conditions, too large torque will damage the flaring, and too small torque will lead to looseness and
leakage. Determine the tightening torque by reference to the following table.
•
Replenishment quantity of refrigerant required for air conditioner
The single-pass pipe is shorter than 5 m, and no additional length is required (note: The unit has been
replenished before being shipped).
If the single-pass pipe length is 5 m or more, the quantity of fluorine required to be replenished is 0.060X (L-5).
(Unit: kg)
Record the replenishment quantity of the refrigerant and keep the record properly for reference in future
maintenance.
Table 3:
Pipe diameter Torque
φ
6.35
1420~1720N.cm
(144~176kgf.cm)
φ
9.53
3270~3990N.cm
(333~407kgf.cm)
φ
12.7
4950~6030N.cm
(504~616kgf.cm)
φ
16.0
6180~7540N.cm
(630~770kgf.cm)
φ
19.0
9720~11860N.cm
(990~1210kgf.cm)