Daikin SERHQ020BAW1, Installation And Operation Manual

Page: 14 / 60

5 Installation
Installation and operation manual
14
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508019-2B – 2018.01
5.4 Connecting the refrigerant piping
5.4.1 Using the stop valve and service port
To handle the stop valve
Take the following guidelines into account:
▪ The stop valves are factory closed.
▪ The following illustrations show each part required in handling the
valve.
c
d
a
b
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
a b
c d e
a Service port
b Stop valve cover
c Hexagon hole
d Shaft
e Seal
▪ Keep both stop valves open during operation.
▪ Do NOT apply excessive force to the stop valve. Doing so may
break the valve body.
To open/close the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench (liquid side: 4 mm, gas side: 8 mm)
into the stop valve and turn the stop valve:
Counterclockwise to open.
Clockwise to close.
3 When the stop valve CANNOT be turned any further, stop
turning. The valve is now open/closed.
INFORMATION
▪ The SERHQ020 supports Ø22.2 field piping on the
accessory pipe supplied with the unit.
▪ The SERHQ032 supports Ø28.6 field piping on the
accessory pipe supplied with the unit.
To handle the service port
Location of service ports:
For the service port location, refer to the "Caution" label attached on
the front panel of the outdoor unit.
▪ 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.
Tightening torques
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
Ø25.4 27.0~33.0 8 mm 22.5~27.5
5.4.2 To connect the refrigerant piping to the
outdoor unit
NOTICE
All field piping must be installed by a licensed refrigeration
technician and must comply with thye relevant local and
national regulations.
Seal the piping and wiring intake holes using sealing material (field
supply), otherwise the capacity of the unit will drop and small
animals may enter the machine.
Example: passing piping out through the front
a b c
a Plug the grey areas (piping routed through the front panel)
b Gas side piping
c Liquid side piping
NOTICE
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak detection.
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.
NOTICE
Use a 2-stage vacuum pump with a non-return valve that
can evacuate to a gauge pressure of −⁠100.7 kPa
(−⁠1.007 bar)(5 Torr absolute). Make sure the pump oil
does not flow oppositely into the system while the pump is
not working.