McQuay M5MSY20BR User Manual

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Application Information M5MSY-2010
Piping Works
Do not use contaminated or damaged copper
tubing. Do not remove plastic, rubber plugs and
brass nuts from the valves, fi ttings, tubings and
coils until you are ready to connect suction or liquid
line into valves or fi ttings.
If any brazing work is required, ensure that the
nitrogen gas is passed through coil and joints while
the brazing work is being done. This will eliminate
soot formation on the inside walls of the copper
tubings.
Cut the connection pipe with a pipe cutter.
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1/4t
Cutting copper tube
Remove burrs from cut edges of the pipes with
remover. Hold the end of the pipe downwards to
prevent metal chips from entering the pipe.
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Remove burr indoor
Insert the fl are nuts, mounted on the connection
parts of both the indoor unit and outdoor unit onto
the copper pipes.
Flare the pipe with extra length above the fl aring
tool as shown in the table.
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Copper tube
Swaging block
Ø Tube, D A (mm)
Inch mm Imperial Rigid
1/4” 6.35 1.3 0.7
3/8” 9.52 1.6 1.0
1/2” 12.70 1.9 1.3
5/8” 15.88 2.2 1.7
3/4” 19.05 2.5 2.0
The fl ared edge must be even and not cracked or
scratched.
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Piping Connection To The Units
The outdoor unit is equipped with two to four sets of
fl are joints depending on O/D unit model. Refer to
the table below for fl are joint size and location.
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Model Pipe A B C D
M5MSY20BR
Liquid 1/4” 1/4” - -
Gas 1/2” 1/2” - -
M5MSY25BR
Liquid 1/4” 1/4” 1/4” -
Gas 3/8” 1/2” 1/2” -
M5MSY30BR
Liquid 1/4” 1/4” 1/4” 1/4”
Gas 3/8” 3/8” 1/2” 1/2”
In the case where the gas pipe from the indoor unit
does not match the outdoor fl are joints, fl are joint
connectors shall be used. The piping connection
size shall follow the size of the indoor unit’s fl are
joint. The connector should be connected as shown
in fi gure.
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FLARE
TUBE
FLARE JOINT
INDOOR
PIPING
SPANNER
TORQUE WRENCH
FLARE NUT
CONNECTOR
Align the center of the piping and tighten the fl are
nut suffi ciently with fi ngers.
Finally, tighten the fl are nut with the torque wrench
until the wrench clicks.
Do not exceed the recommended tightening torque
as this may cause damage on the fl are surface and
refrigerant leakage.
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Pipe Size mm/(in) Torque Nm/(ft-lb)
6.35 (1/4) 18 (13.3)
9.52 (3/8) 42 (31.0)
12.70 (1/2) 55 (40.6)
15.88 (5/8) 65 (48.0)
19.05 (3/4) 78 (57.6)

McQuay M5MSY20BR Specifications

General

Brand	McQuay
Model	M5MSY20BR
Category	Air Conditioner
Language	English