Toshiba MMY-MUP0961HT6P-UL Service Manual page 268

Model: MMY-MUP1921*
For Standard 16 ton
[When replacing normal as well as troubled compressor] - applicable to
<Remove the normal compressor>
• Remove the normal compressor in the same way as the troubled compressor.
Note:
• Be sure to insulate the removed compressor leads using insulation tape, etc.
WARNING
When detaching a pipe by heating with a burner at brazed joint, take care as any oil left in the piping may burn
in a momentary flash of fire when the brazing filler metal melts.
<Measuring amount of oil in normal compressor>
• As was the case with the troubled compressor, measure the amount of oil contained by placing the
compressor on a scale.
Amount of oil in normal compressor: A [gal] = (Weight of compressor as it was dismantled (Ibs) - 57.3Ibs) × 0.1249
(Specific volume of oil: 0.1249 [gal/Ibs])
* The weight of the compressor without oil inside is 57.3Ibs.
<Adjusting amount of oil in new compressors>
• Perform the adjustment on the basis of how much oil the failure compressor contained, A [gal], and how
much oil the normal compressor contained, B [gal], by following the steps below.
1
Combined amount of oil in troubled and normal compressors A+B [gal]: 0
(1) Adjust the amount of oil in the two new compressors to 0.264 gal each (total 0.581).
• Lay the compressors down and draw .0211 [gal] of oil from each of them via their oil equalization pipes.
Notes:
• Do not draw more than 0.211 [gal] of oil from a compressor as it may cause damage.
• If the troubled compressor contained 0.132 gal or less, there may have been a problem with the oil
equalization circuit, etc. Perform checks in accordance with "11-3. Check Procedure to Search Cause of
Compressor Oil Shortage".
2
Combined amount of oil in troubled and normal compressors
A+B [gal]: 0.581
(1) Adjust the amount of oil in the two new compressors to (A+B)/2 gal each.
• Lay the compressor down and draw [1.004-(A+B)][gal] of oil from
each of them via their oil equalization pipes.
3
Combined amount of oil in troubled and normal compressors
A+B [gal]: 1.004
(1) Adjust the amount of oil in the two new compressors to (A+B)/2 gal
each.
(Insert a hose into the discharge pipe or oil equalization pipe of each
compressor and inject (A+B)/2-0.502 [gal] of oil using a funnel, etc.)
A+B < 1.004
A+B
- 268 -
A+B < 0.581
Compressor