Sanyo ECO G SGP-EW120M2G2W, Technical Data Manual

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Installation Work
1. Points regarding refrigerant pipe work
E-8
(4) Connecting the refrigerant tubing
1. Remove the fastening rubber.
2. Connect the tubes and perform brazing.
3. Reattach the gas tube, liquid tube fastening panel, and fastening rubber as they were originally.
Caution
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 clothes 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.
•
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.
(5) 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 con rm there is no leakage from any connections.
•
Connect the manifold gauge to both service ports - on the wide tube side and narrow tube size. Then
connect the nitrogen tank, vacuum pump, and other items as shown in Fig. 5.
•
When performing airtightness tests or creating vacuums, perform them for all service ports
simultaneously. (All outdoor unit valves should remain closed.)
•
Always use nitrogen for the airtightness test. (Do not use oxygen, carbon dioxide, other refrigerants, etc.)
•
When performing the airtightness test for newly installed indoor/outdoor unit tubing, we recommend
testing the tubes separately before connecting them to outdoor units.
Caution
•
The service ports are check valves.
•
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.
Figure 3
Figure 4
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