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13 Piping installation
Stop valve size
Liquid side
(a)
Refrigeration side
Ø15.9
Air conditioner
Ø15.9
(a)
side
(a)
Reducers (field supply) may be required to connect the piping.
13.1.5
To select refrigerant branch kits
Always use K65 T-joints with a suitable design pressure for
refrigerant branching.
13.1.6
To select expansion valves for
refrigeration
The system controls liquid temperature and liquid pressure. Select
the expansion valves as indicated according to nominal conditions
and design pressure.
Nominal conditions
The following nominal conditions are valid for the liquid piping at the
outlet of the outdoor unit. They are based on an ambient
temperature of 32°C and an evaporate temperature of -10°C.
If showcases or blower coils are connected directly
Liquid temperature
Liquid pressure
Refrigerant condition
If capacity up unit is connected between outdoor unit and
showcases or blower coils
Liquid temperature (at outlet of capacity up
unit)
Liquid pressure (at outlet of capacity up unit) 6.8 MPaG
Refrigerant condition (at outlet of capacity up
unit)
(optional) If a pressure reduction kit is connected between
outdoor unit and showcases or blower coils
Liquid temperature (at outlet of pressure
reduction kit)
Liquid pressure (at outlet of pressure
reduction kit)
Refrigerant condition
Design pressure
Make sure all parts comply to the following design pressure:
1
A
A
A
3
A
4
B
B
B
1
Capacity up unit (LRNUN5*)
2
Outdoor unit (LRYEN10*)
3
Indoor unit (showcase)
4
Indoor unit (blower coil)
Installation and operation manual
20
Gas side
Ø19.1
Ø15.9
23°C
6.8 MPaG
Subcooled liquid
3°C
Subcooled liquid
3°C
4.8~5.6 MPaG
Subcooled liquid
2
C
C
5
C
5
Indoor unit (air conditioning)
A
Liquid piping (refrigeration side): 90 bar
B
Gas piping (refrigeration side): depends on design
pressure of showcase and blower coil. For example,
60 bar
C
Gas and liquid piping (air conditioning side): 120 bar
13.2
Using stop valves and service
ports
For more information about the card on the unit, see
ports" [ 4 12].
stop valves and service
WARNING
When stop valves are closed during service, the pressure
of the closed circuit will increase due to high ambient
temperature. Make sure the pressure is kept below the
design pressure.
13.2.1
To handle the stop valve
Take the following guidelines into account:
▪ Make sure to keep all stop valves open during operation.
▪ The gas and liquid stop valves are factory closed.
▪ Do NOT apply excessive force to the stop valve. Doing so may
break the valve body.
Open versus closed
All stop valves are of the backseat type and do not have a valve core
for the charge port.
A
a
b
A
Fully closed (connected between charge port and indoor
unit side)
B
Fully open (connected between outdoor unit and indoor
unit)
a
To outdoor unit
b
To indoor unit
To open the stop valve
1 Remove the valve cap with 2 spanners.
2 Loosen the packing holder by rotating counterclockwise from
1/8 to 1/2 turn.
3 Turn the valve stem counterclockwise until it stops.
1
To close the stop valve
1 Turn the valve stem clockwise until it stops. Tighten with the
appropriate tightening torque.
CO₂ Conveni-Pack outdoor unit and capacity up unit
"Card about
B
a
b
2
3
LRYEN10A7Y1+LRNUN5A7Y1
4P605461-1B – 2020.08
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Troubleshooting
