Daikin RXYHQ12P8W1B, Installation Manual

Installation manual

19

RX(Y)Q5-10-1 RXQ RXYQ

RXYHQ1 RX(Y)Q14~18P7W1BA

VRVIII System air conditioner

4PW48461-1

11.2. Precautions when adding R410A

Be sure to charge the specified amount of refrigerant in liquid state to
the liquid pipe.

Since this refrigerant is a mixed refrigerant, adding it in gas form may
cause the refrigerant composition to change, preventing normal
operation.

■

Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.

■

Be sure to use tools exclusively for R410A to ensure required
pressure resistance and to prevent foreign materials from mixing
into the system.

11.3. Stop valve operation procedure

Size of stop valve

The sizes of the stop valves connected to the system are as listed in
the table below.

Opening stop valve 

(See figure 14)

1.

Remove the cap and turn the valve counterclockwise with the
hexagon wrench.

2.

Turn it until the shaft stops.

3.

Make sure to tighten the cap securely. Refer to the table below

Closing stop valve 

(See figure 14)

1.

Remove the cap and turn the valve clockwise with the hexagon
wrench.

2.

Securely tighten the valve until the shaft contacts the main body
seal.

3.

Make sure to tighten the cap securely.
For the tightening torque, refer to the table above.

11.4. How to check how many units are connected

It is possible to find out how many indoor units are active and
connected by operating the push-button switch on the printed circuit
board (A1P) of the working outdoor unit. In a multiple outdoor unit
system, you can find out how many outdoor units are connected to
the system by using the same procedure.

Make sure that all the indoor units connected to the outdoor unit are
active. 

Follow the 5-step procedure as explained below.

■

The LEDs on the A1P shows the operating status of the outdoor
unit and the number of indoor units that are active.

■

The number of units that are active can be read from the LED
display in the "Monitor Mode" procedure below.
Example: in the following procedure there are 22 units active: 

Charge the liquid 
refrigerant with the 
cylinder in upright 
position.

Charge the liquid 
refrigerant with the 
cylinder in up-side-down 
position.

Charging with an unsuitable substance may cause
explosions and accidents, so always make sure that the
appropriate refrigerant (R410A) is charged.

Refrigerant containers must be opened slowly.

■

Do not open the stop valve until all piping and
electrical steps of 

"10. 

Checking of unit and

installation conditions" on page 18

  are completed. If

the stop valve is left open without turning on the
power, it may cause refrigerant to build up in the
compressor, leading to insulation degradation.

■

Always use a charge hose for service port connection.

■

After tightening the cap, check that no refrigerant
leaks are present.

Type

5

8

10

12

14

16

18

Liquid line stop valve

Ø9.5

(a)

(a) The model RX(Y)Q12 + RXYHQ12 supports field piping of Ø12.7 on the 

accessory pipe supplied with the unit.

Ø12.7

(b)

(b) The model RX(Y)Q18 supports field piping of Ø15.9 on the accessory pipe 

supplied with the unit.

Gas line stop valve

Ø15.9 Ø19.1

Ø25.4

(c)

(c) The model RX(Y)Q10 supports field piping of Ø22.2 on the accessory pipe 

supplied with the unit.
The model RX(Y)Q12~18 + RXYHQ12 supports field piping of Ø28.6 on the 
accessory pipe supplied with the unit.

1

Service port

2

Cap

3

Hexagon hole

4

Shaft

5

Seal

Do not apply excessive force to the stop valve. Doing
so may break the valve body, as the valve is not a
backseat type. Always use the special tool.

Stop valve size

Tightening torque N•m (Turn clockwise to close)

Shaft

Cap (valve lid)

Service port

Valve body

Hexagonal 

wrench

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

x

OFF

w

ON

c

Blinking

NOTE

Wherever during this procedure, press the

 button if something becomes unclear.

You will return to setting mode 1 (H1P= 

x

 "OFF").

1

Setting mode 1 (default system status)

H1P

H2P

H3P

H4P

H5P

H6P

H7P

Default status (normal)

x

x w x

x

x

x

Press the 

button to switch from setting mode 1 to monitor 

mode.

2

Monitor mode

H1P

H2P

H3P

H4P

H5P

H6P

H7P

Default status display

c x

x

x

x

x

x

To check the number of indoor units, press the 

button 5 times

To check the number of outdoor units, press the 

button 8 times

BS1  MODE

BS1  MODE

BS2  SET

BS2  SET