Daikin RXQ18P7W1BA Installation Manual download pdf (Page 24)

Installation manual

RX(Y)Q5-10-12P7W1B + RXQ8P7W1B + RXYQ8P8W1B +

RXYHQ12P8W1B + 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)

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 portValve 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

OFF

Blinking

NOTE

Wherever during this procedure, press the

button if something becomes unclear.

You will return to setting mode 1 (H1P=

x "OFF").

Setting mode 1 (default system status)

H1P H2P H3P H4P H5P H6P H7P

Default status (normal)

xxwxxxx

Press the button to switch from setting mode 1 to monitor

mode.

Monitor mode

H1P H2P H3P H4P H5P H6P H7P

Default status display

c xxxxxx

To check the number of indoor units, press the button 5 times

To check the number of outdoor units, p

ress the button 8 times

BS1 MODE

BS2 SET

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 37 38

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Daikin RXQ18P7W1BA Installation Manual Page 24

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