20
Table 6.6b Compressor free internal volume for 1 phase motor
Table 6.6a Compressor free internal volume for 3 phase motor
6.5 SIGHT GLASS
Compressors are equipped and delivered with threaded
oil sight glass of size 1 ¼” 12UNF.
It can be used for visual check of oil, its quantity,
composition or used for parallel multi compressor
connections. Recommended size of wrench for sight
glass nut is 36mm applying torque 55÷60Nm.
6.6 FREE INTERNAL VOLUME
COMPRESSOR SIZE
FREE INTERNAL VOLUME L
LOW SIDE HIGH SIDE
2 HP
4.1 1
2.5 3 HP
3.8 1
3.5 5 HP
3.6 1
6 HP
3.2 1
7 HP
7.3 0.9
8 9 HP
6.5 0.9
10 13 HP
6.3 0.9
COMPRESSOR SIZE
FREE INTERNAL VOLUME L
LOW SIDE HIGH SIDE
2 3 HP
3.6 1
3.5 4 HP
3.2 1
Figure 6.5 Sight glass
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