Connecting The Refrigerant Piping; Using The Stop Valve And Service Port; To Route The Refrigerant Piping - Daikin VRV 5 RXYA8A7Y1B Installation And Operation Manual

15 Piping installation
If
>2 m
>2 m
b
a
≤2 m
a To indoor unit
b Piping between outdoor units
NOTICE
There are restrictions on the refrigerant pipe connection
order between outdoor units during installation in case of a
multiple outdoor unit system. Install according to following
restrictions. The capacities of outdoor units A and B must
fulfill the following restriction conditions: A≥B.
A B
a b
a To indoor units
b Outdoor unit multi connecting piping kit (first branch)
15.2

Connecting the refrigerant piping

15.2.1

Using the stop valve and service port

To handle the stop valve
Take the following guidelines into account:
▪ The gas and liquid stop valves are factory closed.
▪ Make sure to keep all stop valves open during operation.
▪ Do NOT apply excessive force to the stop valve. Doing so may
break the valve body.
To open the stop valve
1 Remove the dust cap.
2 Insert a hexagon wrench into the stop valve.
3 FULLY turn the stop valve counterclockwise and tighten until
the correct tightening torque value is achieved (see
torques" [ 4 32]).
NOTICE
Stop valves need to be opened on torque specified in this
manual. It is not allowed to turn valve "a quarter turn" back
when opening it.
4 Install the dust cap.
Result: The valve is now open.
Installation and operation manual
32
Then
"Tightening
NOTICE
Reinstall dust cap to prevent aging of O-ring and risk of
leakage.
To close the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench into the stop valve and turn the stop
valve clockwise.
3 When the stop valve cannot be turned any further, stop turning.
4 Install the stop valve cover.
Result: The valve is now closed.
To handle 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.
Tightening torques
Stop valve Tightening torque [N•m]
size [mm]
Valve body
Ø9.5 5~7
Ø12.7 8~10
Ø15.9 14~16
Ø19.1 19~21
Ø25.4
(a) When opening or closing.
15.2.2

To route the refrigerant piping

Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in the
figure below.
c
a
b
a Left-side connection
b Front connection
c Right-side connection
Note: For side connections, remove the knockout hole on the bottom
plate as shown below:
(a)
Hexagonal Service port
wrench
4 mm 10.7~14.7
6 mm
8 mm
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P739915-1 – 2023.12