To Connect The Refrigerant Piping To The Indoor Unit - Daikin SERHQ020BAW1 Installer And User Reference Manual

6 Installation
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
WARNING
Never remove the pinched piping by brazing.
WARNING
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.
CAUTION
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 If the pinched piping lower part looks like detail A in the figure
below, perform the last 2 steps of this procedure.
6 If the pinched piping lower part looks like detail B in the figure
below, perform the last 3 steps of this procedure.
7 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 has
dripped out.
8 Cut the pinched piping off with a pipe cutter just above the
brazing point or just above the marking if there is no brazing
point.
9 Wait until all oil is dripped out in case the recovery was not
complete, and only then proceed with connection of the field
piping.
Installer and user reference guide
22
a
b
b
c
c
B
A
a Service port
b Stop valve
c Point of pipe cutting just above brazing point or above
marking
A+B Pinched piping
6.5.5 To connect the refrigerant piping to the
indoor unit
▪ For the SEHVX20+32BAW, remove the top knockout hole in the
side service plate and add the grommet (accessory) to cover any
burrs. For the SEHVX40+64BAW, remove both top and bottom
knockout holes in the side service plate and add the grommets
(accessory) to cover any burrs.
a
a Knockout hole
b Grommet
▪ First cut off the refrigerant liquid piping inside the unit
approximately 7 cm before the clamp and the refrigerant gas
piping 4 cm before the clamp. This is necessary in order to avoid
the piping cutter tool from interfering with the piping. Remove any
burrs from the piping.
▪ Use accessory pipes to connect field refrigerant piping to the
piping connections on the indoor unit. For SEHVX20BAW, after
cutting off the end of both the liquid and gas refrigerant piping,
braze accessory pipe 1 to the liquid connection and accessory
pipe 2 to the gas connection. For SEHVX32BAW, after cutting off
the end of both the liquid and gas refrigerant piping, braze the field
piping directly to the liquid connection and accessory pipe 2 to the
gas connection. For SEHVX40BAW, perform the procedure for
SEHVX20BAW twice. For SEHVX64BAW, perform the procedure
for SEHVX32BAW twice.
NOTICE
After brazing, fix the pipes to the unit using the clamps in
the pipe supports.
SERHQ020~032BAW1 + SEHVX20~64BAW
b
Split packaged air-cooled water chiller
4P508020-1B – 2018.04