RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
Installation and operation manual
20
10.3.3. Cautions on handling the stop valve cover
The stop valve cover is sealed where indicated by the arrow.
Take care not to damage it.
After handling the stop valve, make sure to tighten the stop
valve cover securely. For the tightening torque, refer to the table
below.
Check for refrigerant leaks after tightening the stop valve cover.
10.3.4. Cautions on handling the service port
Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
After handling the service port, make sure to tighten the service
port cover securely. For the tightening torque, refer to the table
below.
Check for refrigerant leaks after tightening the service port
cover.
10.3.5. Tightening torques
10.4. Leak test and vacuum drying
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 initialize.
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.
10.4.1. General guidelines
Use a 2-stage vacuum pump with a non-return valve which can
evacuate to a gauge pressure of –100.7 kPa (5 Torr absolute,
–755 mm Hg).
Connect the vacuum pump to the service port of all 3 stop valves
to increase efficiency (refer to
"10.4.4. Setup" on page 21
).
10.4.2. Installation of refrigerant piping, leak test, vacuuming
before electrical installation is done (regular installation
method)
When all piping work is complete, it is necessary to:
Check for any leakages in the refrigerant piping.
Perform 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, rainwater may have entered the piping), 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.
See
"10.4.4. Setup" on page 21
and
"10.4. Leak test and vacuum
drying" on page 20
.
10.4.3. Installation of refrigerant piping, leak test, vacuuming
after electrical installation is done on any indoor or
outdoor unit
Apply outdoor unit setting [2-21]=1 (refer to
"15.2. Monitoring function
and field settings" on page 38
) before starting leak test and
vacuuming. This setting will open field expansion valves to guarantee
a R410A piping pathway.
When all piping work is complete, it is necessary to:
Check for any leakages in the refrigerant piping.
Perform 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, rainwater 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 stop valves are firmly closed before performing
leak test or vacuum drying.
See
"10.4.4. Setup" on page 21
and
"10.4. Leak test and vacuum
drying" on page 20
.
Stop valve
size (mm)
Tightening torque N•m (turn clockwise to close)
Shaft
Valve body
Hexagonal
wrench
Cap (valve
lid)
Service port
Ø9.5
5.4~6.6
4 mm
13.5~16.5
11.5~13.9
Ø12.7
8.1~9.9
18.0~22.0
Ø15.9
13.5~16.5
6 mm
23.0~27.0
Ø19.1
27.0~33.0
8 mm
22.5~27.5
Ø25.4
Refrigerant piping works are
finished?
No
Finish piping work
Yes
The indoor units and/or
outdoor unit were already
powered ON?
No
Use procedure
"10.4.2. Installation of
refrigerant piping, leak test,
vacuuming before electrical
installation is done (regular
installation method)" on
page 20
.
Yes
Use procedure
"10.4.3. Installation of
refrigerant piping, leak test,
vacuuming after electrical
installation is done on any
indoor or outdoor unit" on
page 20
.
NOTICE
Do not purge the air with refrigerants. Use a vacuum pump
to evacuate the installation.
NOTICE
Make sure that all (field supplied) field piping valves are
OPEN (not outdoor unit stop valves!) before you start leak
test and vacuuming.
NOTICE
Make sure that all (field supplied) field piping valves
are OPEN (not outdoor unit stop valves!) before you
start leak test and vacuuming.
Make sure that all indoor units connected to the
outdoor unit are powered on.
Wait until the outdoor unit has finished the initialisation
to apply setting [2-21].
Содержание RYYQ8T7Y1B
Страница 68: ......
Страница 69: ......
Страница 70: ......
Страница 72: ...4P329765 1 2012 09 Copyright 2012 Daikin 4P329765 1 0000000U...