McQuay M5MSX 020 A, Руководство пользователя, Страница: 20 / 67

Piping Works
•
Do not use contaminated or damaged copper tubing. Do
not remove plastic, rubber plugs and brass nuts from the
valves, fittings, tubings and coils until you are ready to
connect suction or liquid line into valves or fittings.
• If any brazing work is required, ensure that the nitrogen
gas 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.
• 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.
• Insert the flare 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 flaring tool as
shown in the table below.
• The flare edge must be even and not cracked or
scratched.
Copper tube
Swaging block
∅
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
PIPE CONNECTION PIPE CONNECTION PIPE CONNECTION
INDOOR
UNIT A
INDOOR
UNIT B
INDOOR
UNIT C
INDOOR
UNIT B
INDOOR
UNIT A
INDOOR
UNIT C
INDOOR
UNIT B
INDOOR
UNIT A
INDOOR
UNIT D
Pos. M5MSX020A/AR M5MSX025A/AR M5MSX030A/AR
Liquid Gas Liquid Gas Liquid Gas
A 1/4” 3/8” 1/4” 3/8” 1/4” 3/8”
B 1/4” 3/8” 1/4” 3/8” 1/4” 3/8”
C 1/4” 3/8” 1/4” 3/8”
D 1/4” 3/8”
Cutting copper tube
1/4t
Remove burr Indoor
Piping connection to the units
•
The outdoor unit is equipped with two to
four sets of flare joints depending on O/D
unit model. Refer to table below for flare
joint size and location.
•
In the case where gas pipe from the indoor
unit does not match the outdoor flare joints,
two different flare joint connectors are
provided. The connector should be connected
as shown in figure.
No Flare Joint Connectors
1 3/8” to 1/2” connector
2 1/2” to 3/8” connector
•
Align the center of the piping and tighten the
flare nut sufficiently with fingers.
•
Finally, tighten the flare nut with the torque
wrench until the wrench clicks.
Pipe Size mm / (in) Torque Nm /(ft - Ib)
6.35 (1/4) 18 (13.3)
9.53 (3/8) 42 (31.0)
12.70 (1/2) 55 (40.6)
FLARE JOINT CONNECTOR
FLARE TUBE
INDOOR PIPING
FLARE NUT
SPANNER
TORQUE WRENCH
18