Specifications

80
7) Refrigerant Piping
Maximum Pipe Length And Maximum Number Of Bends
Always choose the shortest path for refrigerant piping and follow the recommendations as tabulated below:
MWM031F MWM030FR
MODEL
DATA
MWM
007F/FR
MWM
010F/FR
MWM
015F/FR
MWM
020F/FR
MWM
025F/FR
MLC031B MLC031C* MLC030BR MLC030CR
Max. Length, L (m) 12 12 12 15 15 35 45 35 45
Max. Elevation, H (m) 5 5 5 8 8 15 25 15 25
Max. No. of Bends 10 10 10 10 10 10 10 10 10
* Need to add external accumulator
Flare Connection
• Cut the pipe stages by stages, advancing the blade of pipe cutter slowly.
• Remove burr with the burr remover. Hold the flaring end down to prevent burrs from dropping inside pipe.
• The exact length of pipe protruding from the face of the flare die is determined by the flaring tool. The table shows the
use of an imperial die and riged die.
A(mm)
PIPE ∅, D (mm)
IMPERIAL DIE RIGED DIE
6.35 (1/4”) 1.3 0.7
9.52 (3/8”) 1.6 1.0
12.7 (1/2”) 1.9 1.3
15.88 (5/8”) 2.2 1.7
Fix the pipe firmly on the flare die. Match the centers of both the flare die and the flaring punch, and tighten flaring punch
fully.
8) Vacuuming And Charging
• The precharged outdoor unit does not need any vacuuming or charging. However once it is connected, the
connecting pipe line and the indoor need to be vacuumed before releasing the R22/R407C from the outdoor unit.
1) Open the service port core cap.
2) Connect pressure gauge to the service port.
3) Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum to –0.1 MPa
(-760mmHg) or lower. (Evacuation time varies by the pump but averagely in 1 hour).
Note : R407C – Fix filter dryer
R22 - Nil