About Connecting The Refrigerant Piping; To Route The Refrigerant Piping; To Connect The Refrigerant Piping To The Outdoor Unit; To Connect The Multi Connection Piping Kit - Daikin VRV IV+ RYYQ12U7Y1B Series Installer And User Manual

6 Installation
WARNING
Take sufficient precautions in case of refrigerant leakage. If
refrigerant gas leaks, ventilate the area immediately.
Possible risks:
▪ Excessive refrigerant concentrations in a closed room
can lead to oxygen deficiency.
▪ Toxic gas may be produced if refrigerant gas comes
into contact with fire.
WARNING
ALWAYS recover the refrigerant. Do NOT release them
directly into the environment. Use a vacuum pump to
evacuate the installation.
▪ Only use phosphoric acid deoxidised seamless copper.
NOTICE
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak detection.
6.4.2

About connecting the refrigerant piping

Before connecting the refrigerant piping, make sure the outdoor and
indoor units are mounted.
Connecting the refrigerant piping involves:
▪ Routing and connecting the refrigerant piping to the outdoor unit
▪ Protecting the outdoor unit against contamination
▪ Connecting the refrigerant piping to the indoor units (see the
installation manual of the indoor units)
▪ Connecting the multi-connection piping kit
▪ Connecting the refrigerant branching kit
▪ Keeping in mind the guidelines for:
▪ Brazing
▪ Using the stop valves
▪ Removing the pinched pipes
6.4.3

To route the refrigerant piping

Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in the
figure below.
c
a b
a Left-side connection
b Front connection
c Right-side connection
For side connections, the knockout hole on the bottom plate should
be removed:
a
b
c
a Large knockout hole
Installer and user reference guide
22
b Drill
c Points for drilling
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.
6.4.4 To connect the refrigerant piping to the
outdoor unit
INFORMATION
All local inter unit piping are field supplied except the
accessory pipes.
NOTICE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
≤Ø25.4
1
1
NOTICE
▪ Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
▪ Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel. Especially
for the bottom and side connection, be sure to protect
the piping with suitable insulation, to prevent it from
coming into contact with the casing.
Connect the stop valves to the field piping using the accessory pipes
supplied with the unit.
The connections to the branch kits are the responsibility of the
installer (field piping).
6.4.5

To connect the multi connection piping kit

NOTICE
Improper installation may lead to malfunction of the
outdoor unit.
▪ Install the joints horizontally, so that the caution label (a) attached
to the joint comes to the top.
▪ Do not tilt the joint more than 7.5° (see view A).
▪ Do not install the joint vertically (see view B).
7.5°
A
7.5°
a
a Caution label
>Ø25.4
1
2 2
1
B
a
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09