Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin RXYSCQ5TMV1B Installation And Operation Manual

5 Installation
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing and underlying piping.
▪ After making the knockout holes, we recommend to
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.
3 Do the following:
▪ Connect the liquid pipe (a) to the liquid stop valve.
▪ Connect the gas pipe (b) to the gas stop valve.
b
a
▪ In case of RXYSCQ6: Connect the gas piping accessory (c).
This is necessary because the size of the gas stop valve is
Ø15.9 while the piping between outdoor unit and first
refrigerant branch kit is Ø19.1. The connection of this gas
piping accessory with the Ø19.1 field piping is made with a
flare connection.
c Gas piping accessory (only for RXYSCQ6)
4 Reattach the service cover and the piping intake plate.
5 Seal all gaps (example: a) to prevent snow and small animals
from entering the system.
a
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
NOTICE
Make sure to open the stop valves after installing the
refrigerant piping and performing vacuum drying. Running
the system with the stop valves closed may break the
compressor.
Installation and operation manual
10
c
5.4

Checking the refrigerant piping

5.4.1

About checking the refrigerant piping

Refrigerant piping works are
finished?
No
Yes
The indoor units and/or
outdoor unit were already
No
powered ON?
Yes
Use procedure:
"Method 2: After power ON".
It is very important that all refrigerant piping work is done before the
units (outdoor or indoor) are powered on.
When the units are powered on, the expansion valves will initialise.
This means that they will close. Leak test and vacuum drying of field
piping and indoor units is impossible when this happens.
Therefore, there will be explained 2 methods for initial installation,
leak test and vacuum drying.
Method 1: Before power ON
If the system has not yet been powered on, no special action is
required to perform the leak test and the vacuum drying.
Method 2: After power ON
If the system has already been powered on, activate setting [2‑21]
(refer to "6.1.4 To access mode 1 or 2" on page
will open field expansion valves to guarantee a R410A piping
pathway and make it possible to perform the leak test and the
vacuum drying.
NOTICE
Make sure that all indoor units connected to the outdoor
unit are powered on.
NOTICE
Wait to apply setting [2‑21] until the outdoor unit has
finished the initialisation.
Leak test and vacuum drying
Checking the refrigerant piping involves:
▪ Checking for any leakages in the refrigerant piping.
▪ Performing vacuum drying to remove all moisture, air or nitrogen
in the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, water may have entered the piping), first carry
out the vacuum drying procedure below until all moisture has been
removed.
All piping inside the unit has been factory tested for leaks.
Only field installed refrigerant piping needs to be checked.
Therefore, make sure that all the outdoor unit stop valves are firmly
closed before performing leak test or vacuum drying.
NOTICE
Make sure that all (field supplied) field piping valves are
OPEN (not outdoor unit stop valves!) before you start leak
test and vacuuming.
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
16). This setting
RXYSCQ4~6TMV1B
VRV IV-S system air conditioner
4P555881-1 – 2019.07