McQuay MWM 007F, Manual

Page: 83 / 108

8) 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:
* 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.
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.
9) 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).
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INDOOR UNIT
Flare Joint
Flare Valve
OUTDOOR UNIT
CHARGE SET
VACUUM PUMP
A(mm)
PIPE
∅
, D (mm)
IMPERIAL DIE RIGID 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
MWM 030F/FR MODEL
DATA
MWM
010F/FR
MWM
015F/FR
MWM
020F/FR
MWM
025F/FR MLC 030B/BR MLC 030C/CR
Max. Length (m) 12 12 15 15 35 45
Max. Elevation (m) 5 5 8 8 15 25
Max. No of bends 10 10 10 10 10 10