Daikin VRV IV RXMLQ8T7Y1B Series, Инструкция по установке и эксплуатации

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5 Installation
Installation and operation manual
13
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1 – 2018.07
5.3.7 To remove the pinched pipes
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 cover and make sure that the stop valves are
fully closed.
c
d
a
b
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
2 Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
p< p>
R410A N2
b c e
a
f g
d
A B
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
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 Cut off the lower part of the gas, liquid and equalising stop
valve pipes along the black line. Use an appropriate tool (e.g. a
pipe cutter).
WARNING
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
6 Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
5.4 Checking the refrigerant piping
5.4.1 About checking the refrigerant piping
Refrigerant piping works are
finished?
The indoor units and/or
outdoor unit were already
powered ON?
Use procedure:
"Method 2: After power ON".
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
Yes
No
No
Yes
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 21 ). This setting
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 until the outdoor unit has finished the initialisation to
apply setting [2‑21].
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.