Pipe Connection; Connecting The Refrigerant Piping - Daikin CMSQ200A7W1B Installation Manual

6.3.

Pipe connection

Be sure to perform a nitrogen blow when brazing and to read the
paragraph "Caution to be taken when brazing refrigerant piping" on
page 4 first.
NOTE The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
(See figure 9)
1 Refrigerant piping
2 Location to be brazed
3 Nitrogen
4 Taping
5 Manual valve
6 Regulator
7 Nitrogen
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
6.4.

Connecting the refrigerant piping

1 Front connection or side connection
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure.
1 2
1 Left-side connection
2 Front connection
3 Right-side connection
NOTE Precautions when knocking out knock holes
■
Be sure to avoid damaging the casing
■
After knocking out the holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using the repair paint to prevent
rusting.
■
When passing electrical wiring through the knock
holes, wrap the wiring with protective tape to
prevent damage.
CMSQ200+250A7W1B
Air conditioning system
4PW47543-1C – 07.2010
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2 Removing the pinched piping
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1 Remove the valve lid and make sure
that the stop valves are fully closed.
2 Connect a charge hose to service ports of all stop
valves.
3 Recover gas and oil from the pinched piping by
using a recovery unit.
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the pinched
piping, disconnect the charge hose and close the
service ports.
5 In case the pinched piping lower part looks like
A
detail in
procedure steps 7+8.
In case the pinched piping lower part looks like
B
detail in
procedure steps 6+7+8.
6 Cut off the lower part of the smaller pinched
piping with an appropriate tool (e.g. a pipe
cutter, a pair of nippers, ...) so that a cross-
section is open, allowing remaining oil to
drip out in case the recovery was not complete.
Wait until all oil is dripped out.
7 Cut the pinched piping off with a pipe cutter just
above the brazing point or just above the marking in
case there is no brazing point.
Never remove the pinched
piping by brazing.
8 Wait until all oil is dripped out in case the recovery
was not complete, and only then proceed with
connection of the field piping.
See figure 7.
1 Service port
2 Stop valve
3 Point of pipe cutting just above brazing point or above marking
A
Pinched piping
B
Pinched piping
(See figure 7)
figure 7, follow instructions as per
figure 7, follow instructions as per
Installation manual
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