Precaution On Installation - Midea MSCI-07HRIN1 User Manual

MCAC-HTSM-2007-11

2. Precaution on Installation

1). Measure the necessary length of the connecting pipe, and make it by the following way.
a. Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Do not harm them.
Specially Notice the pipe length/height/dimension of each capacity.
Model
M2OA-18HRDN1
M2OB-18HRDN1
M3OA-27HRDN1
M4OA-27HRDN1
Piping sizes
Model
18,000 BTU/H
27,000 BTU/H
CAUTIONS
l Daub the surfaces of the flare pipe and the joint nuts with frozen oil, and wrench it for 3~4 rounds
l With hands before fasten the flare nuts.
l Be sure to use two wrenches simultaneously when you connect or disconnect the pipes.
Tubing size
6.35
9.52
12.7
16
19
b. The stop valve of the outdoor unit should be closed absolutely (as original state). Every time you
connect it, first loosen the nuts at the part of stop valve, then connect the flare pipe immediately (in 5
minutes). If the nuts have been loosened for a long time, dusts and other impurities may enter the pipe
system and may cause malfunction later. So please expel the air out of the pipe with refrigerant before
connection.
c. Expel the air after connecting the refrigerant pipe with the indoor unit and the outdoor unit. Then fasten
the nuts at the repair-points.
2) Locate The Pipe
a. Drill a hole in the wall (suitable just for the size of the wall conduit), then set on the fittings such as the
wall conduit and its cover.
b. Bind the connecting pipe and the cables together tightly with binding tapes. Do not let air in, which will
cause water leakage by condensation.
c. Pass the bound connecting pipe through the wall conduit from outside. Be careful of the pipe allocation
to do no damage to the tubing.
3) Connect the pipes.
4) Then, open the stem of stop valves of the outdoor unit to make the refrigerant pipe connecting the
indoor unit with the outdoor unit in fluent flow.
Installation
Maximum pipe length
Max. Length
30
30
45
60
Liquid(mm/inch)
6.35(1/4")
6.35(1/4")
Torque
1420~1720N.cm(144~176kgf.cm)
3270~3990N.cm(333~407kgf.cm)
4950~6030N.cm(504~616kgf.cm)
6180~7540N.cm(630~770kgf.cm)
9720~11860N.cm(990~12106kgf.cm)
Precaution on Installation
Max. Elevation
10
10
10
10
Gas(mm/inch)
9.53(3/8")
9.53(3/8")
129