To Select Refrigerant Branch Kits; To Select Expansion Valves For Refrigeration; Using Stop Valves And Service Ports; To Handle The Stop Valve - Daikin LRYEN10A7Y1 Installation And Operation Manual

a~g Gas piping (side showcases and blower coils)
a2~e2 Gas piping (side air conditioning)
H1~H4 Height difference
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the following
into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in the following chapters:
▪ For outdoor unit without capacity up unit:
additional refrigerant amount: method
▪ For outdoor with capacity up unit:
refrigerant amount: method
Piping size between outdoor unit and first branch
When the equivalent pipe length between outdoor unit and the
furthest indoor unit is 90 m or more (b+d), the size of the main gas
pipe (b) must be increased (size-up). If the recommended gas pipe
(size-up) is not available, you must use the standard size (which
might result in a small capacity decrease).
a
d
b
c
a Outdoor unit
b Main gas pipe
c First refrigerant branch
d Piping between indoor unit and refrigerant branch
e Furthest indoor unit
System side
Refrigeration
Air conditioner
(a)
For refrigeration piping (A, B, a) and for air conditioner piping (A2,
a2)
Piping size between branching areas or between
first and second branch
Indoor unit capacity Piping outer diameter size (mm)
index (kW)
Refrigeration side: liquid pipe
x ≤10.0
10.0< x
Refrigeration side: gas pipe
x ≤6.5
6.5< x ≤14.0
14.0< x
Air conditioner side: liquid pipe
—
Air conditioner side: gas pipe
—
(a)
Piping between branching areas (C, D, c, d)
(b)
Piping from first branch to second branch (B2, b2)
LRYEN10A7Y1+LRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit and capacity up unit
4P605461-1 – 2020.04
"14.2 To determine
1" [ 4 25]
"14.3 To determine additional
2" [ 4 25]
e
Piping outer diameter size
(a)
(mm)
Liquid side Gas side
Ø12.7 x t0.85 Ø15.9 x t1.05
(K65) (K65)
Ø15.9 x t1.05 Ø19.1 x t1.3
(K65) (K65)
(a)
Ø9.5 × t0.65 (K65)
Ø12.7 × t0.85 (K65)
(a)
Ø9.5 × t0.65 (K65)
Ø12.7 × t0.85 (K65)
Ø15.9 × t1.05 (K65)
(b)
Ø12.7 × t0.85 (K65)
(b)
Ø15.9 × t1.05 (K65)
Piping size from branch to indoor unit
Piping outer diameter size (mm)
Gas pipe
Refrigeration side
Same size as C, D, c, d.
If piping sizes of the indoor units are different, connect a reducer
close to the indoor unit to align piping sizes.
Air conditioner side
Ø12.7 × t0.85 (K65)
(a)
Piping from branch to indoor unit (E, F, G, J, e, f, g, j)
(b)
Piping from branch to indoor unit (C2, D2, E2; c2; d2; e2)
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 in the following table. These
conditions are valid for the liquid piping at the outlet of the outdoor
unit.
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
13.2 Using stop valves and service
ports
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.
13 Piping installation
Liquid pipe
(a)
(b)
Ø9.5 × t0.65 (K65)
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
Installation and operation manual
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