Panasonic U-16GE3E5 Verfahren Und Technische Punkte Für Die Installation Der Anlage Seite 16

Pressure reducing valve
Be sure to perform the following before brazing.
• The rubber that fastens the tubes is damaged easily by heat. Be sure to remove it before brazing.
• Cool the tubes with wet cloths or other materials to prevent the value inside the machine from being
damaged by the brazing heat.
• Be sure to replace the contents of the tube with nitrogen to prevent the formation of an oxide film. (Oxygen,
carbon dioxide or refrigerant may not be used)
• Do not use commercially available oxide film agents (antioxidants). They can adversely affect the
refrigerant and the refrigeration oil, and can cause malfunctions.
• If using flare connections (for the indoor connectors or other part), apply refrigeration oil to the flared part.
* With a 3WAY Multi system, there will be 3 tubes. Treat each of the tubes in the same way.
3-4. Tubing airtightness test and vacuum application
An airtightness test is required for gas heat pump A/C as part of industry installation guidelines. Follow the
procedure below to perform the test and confirm there is no leakage from any connections.
 Connect the manifold gauge to both service ports - on the wide tube side and narrow tube side. Then
connect the nitrogen tank, vacuum pump, and other items as shown in Fig. 17.
Connect an R410A control valve (Schrader valve) at the service port for the shut-off valve.
If an R410A control valve (Schrader valve) is not connected, it may cause a frost burn due to refrigerant
leaking when the charge hose is removed.
Use nitrogen to raise the pressure to the airtightness test pressure (4.15 MPaG)
and confirm that there is no leakage.
Refrigerant leakage can cause suffocation and injury to nearby persons.
Fig. 16
EN - 16
Liquid tube
Gas tube