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English

•  When piping work is complete, it is necessary to perform a pressure test 

and evacuate system with a vacuum pump.

•  If using additional refrigerant, purge the air from the refrigerant pipes and 

indoor unit using a vacuum pump, then charge additional refrigerant.

• 

Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.

•  All refrigerant pipe joints should be tightened with a torque wrench to the 

specified tightening torque.

Compound 

pressure gauge

Pressure 
meter

High-pressure 
valve

Gauge 
manifold

Low-pressure 
valve

Charging 

hoses

Vacuum pump

Service port

Valve caps

Liquid 
stop 
valve

Gas stop valve

1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 604psi (4.17MPa) (do not pressurize 

more than 604psi (4.17MPa)) for 1 hour minimum, 24 hours recommended. If there is a pressure drop, check for leaks, 

make repairs and perform the pressure test again.

2) Connect the gauge manifold’s charging hose to the gas stop valve’s service port.
3) Fully open the low-pressure valve (Lo) on the gauge manifold and fully close the high-pressure valve (Hi).

 

(High-pressure valve will require no further operation.)

4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.
5) Close the low-pressure valve (Lo) on the gauge manifold and stop vacuum pumping.

 

(Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing 

back.)*

1

6) 

Remove the valve caps from the liquid stop valve and gas stop valve.

7) To open the liquid stop valve, turn the rod of the valve 90° counter-clockwise using a hexagonal wrench.

 

Close it after 5 seconds, and check for gas leakage.

 

Using soapy water, check for gas leakage from the indoor unit’s flare and outdoor unit’s flare and valve rods.

 

After the check is complete, wipe all soapy water off.*

2

8) 

Disconnect the charging hoses from the service port for the gas stop valve, then fully open the liquid and gas stop valves. 

(Do not attempt to turn the valve rods further than they can go.)

9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified 

torques. 
Refer to 

“4. Refrigerant piping”

 on page 6 for details.

*

1

  If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a loose 

pipe joint. 

Check all pipe joints and retighten nuts as needed, then repeat steps 3) through 5).

*

2

 

 Under no circumstances shall potential sources of ignition be used in the searching for or detection of 
refrigerant leaks.  

A halide torch (or any other detector using a naked flame) shall not be used.

 

Do not use substances containing chlorine and electronic leak detection for gas leak detection.

English

01_EN_3P628775-3.indd   8

2021/02/09   13:40:06

Summary of Contents for RXM18VVJU

Page 1: ...English Fran ais Espa ol MODELS RXM18VVJU RXM24VVJU DAIKIN ROOM AIR CONDITIONER INSTALLATION MANUAL R32 Split Series Installation manual Manuel dinstallation Manual de instalaci n Manuel dinstallation...

Page 2: ...A massive leak can lead to oxygen depletion especially in basements and an asphyxiation hazard could occur leading to serious injury or death Do not ground units to water pipes gas pipes telephone wi...

Page 3: ...re to wear proper gloves Install drain piping to ensure proper drainage Improper drain piping may result in water leakage and property damage Insulate piping to prevent condensation Be careful when tr...

Page 4: ...one containing sulfate gas corrosion may shorten the life of the air conditioner 8 Since water will flow from the drain of the outdoor unit do not place anything under the unit which must be kept away...

Page 5: ...or other means CAUTION Keep the piping length between 10ft 3m and 98 1 2ft 30m Refrigerant piping must be protected from physical damage Install a plastic cover or equivalent If strong wind blows into...

Page 6: ...orientation of the outdoor unit outlet side or use the air direction adjustment grille sold separately Outdoor Unit Installation 1 Installing the outdoor unit When installing the outdoor unit refer t...

Page 7: ...the flare nut is fitted When flaring do not over tighten and crack Check Set exactly at the position shown below A Die Flare tool for R32 or R410A Conventional flare tool Clutch type Clutch type Rigid...

Page 8: ...e to keep dirt and water out Piping size Minimum bend radius Piping thickness Thermal insulation size Thermal insulation thickness Gas side O D 1 2 inch 12 7mm 1 9 16 inch 40mm or more 0 031 inch 0 8m...

Page 9: ...ve Lo on the gauge manifold and stop vacuum pumping Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing back 1 6 Remove the valve caps from t...

Page 10: ...ust be used make sure to use the round crimp style terminal for connection to the power supply terminal block Place the round crimp style terminals on the wires up to the covered part and secure in pl...

Page 11: ...and off when using facility settings Do not place humidifiers or other items which might raise the humidity in rooms where facility settings are being used A humidifier might cause dew condensation fr...

Page 12: ...as stop valve 2 Begin forced cooling operation 3 After 5 to 10 minutes close the liquid stop valve with a hexagonal wrench 4 After 2 to 3 minutes close the gas stop valve and stop forced cooling opera...

Page 13: ...vibration noise No refrigerant gas leaks Incomplete cooling heating function Refrigerant gas and liquid pipes and indoor drain hose extension are thermally insulated Water leakage Draining line is pro...

Page 14: ...The two dimensional bar code is a manufacturing code 3P628775 3 M20B075 2102 HT...

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