Replacement of Main Units
TD831077
VII-8
7
11. Proceed as instructed below to check whether any oil has accumulated in the suction pipe.
¶ Loosen the lower flare part of the oil sensor, and drain off the oil until no more comes out. (Be absolutely sure to
provide a pan large enough to collect about a liter of oil.)
¶ Remove the oil sensor.
¶ Place the cap over the installation hole of the oil sensor.
12. Prepare to remove the welded areas.
¶ Protect the plate, rubber, leads and clampers around these areas.
13. Remove the three welded areas.
Do not perform the work inside the unit when the discharge and suction pipes are to be discon-
nected.
14. Lift and draw the compressor out toward you.
[Installation]
1. Prepare to install the compressor. (Ref. Fig. 4)
¶ Remove the stoppers over the outlet and intake ports of the new compressor.
¶ Mount the oil sensor onto the compressor.
¶ Connect the oil return pipe to the compressor.
¶ Mount the flare nuts and other parts which were removed from the new compressor onto the failed compressor.
2. Install the compressor in the outdoor unit. (Be absolutely sure to check the compressor’s model number.)
3. Shape the pipes and insert them into the welded areas.
4. Replace the air inside the pipes with nitrogen. (If the pipes have not been inserted, discharge a small amount of the
nitrogen while using a burner to apply heat to them, and insert. Use wet cloths or other suitable materials to cool off
the surrounding pipes.)
5. Braze with silver (in two places: discharge pipe and suction pipe). Braze with copper (in one place).
Remove the paint, oil and other foreign matter from the silver brazing areas. Failure to do this may cause leaks.
6.
Close valve V9 and open valve V6 and inspect for leaks. (Keep the pressure within the 1.27 to 1.47 MPa (13-15 kg/cm
2
)
range in order to protect the low-pressure switch.) (Ref. Fig. A)
Under no circumstances do not exceed pressure 1.47 MPa (15 kg/cm
2
).
7. Close valve V6 and open valve V9, and prepare for establishing a vacuum.
8. In the silver brazing areas, remove the flux, and touch up the paint-work. (Ref. Fig. A)
Be absolutely sure to attach the discharge sensor.
1. Compressors
NOTE
NOTE
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