Sight Glasses - Bitzer K033N Instructions De Service

Size
M16
M18
M20
Case A: Screws without flat gasket, property class 8.8
Case B: Screws with flat gasket, property class 5.6
Plugs without gasket
Size Steel
1/8-27 NPTF 15 .. 20 Nm
1/4-18 NPTF 30 .. 35 Nm
3/8-18 NPTF 50 .. 55 Nm
1/2-14 NPTF 60 .. 65 Nm
3/4-14 NPTF 80 .. 85 Nm
Wrap thread with sealing tape before mounting.
Sealing nuts with O-ring
Thread
3/4-16 UNF
1-14 UNS
1 1/4-12 UNF
1 3/4-12 UN
2 1/4-12 UN
AF: width across flats in mm
Set screw A2 and nut .8 at reversing cover with
elastomer gasket
Size
M10
M16
Pipelines at coolant connections
Size
G1/2
G3/4
G1
G1 1/4
G1 1/2
G2
Internal thread at connection nipple
DB-200-6
Case A Case B
150 Nm 98 Nm
136 Nm
220 Nm 175 Nm
AF
22 50 Nm
30 85 Nm
36 105 Nm
50 150 Nm
65 180 Nm
22 Nm
60 Nm
40 Nm
60 Nm
80 Nm
90 Nm
150 Nm
150 Nm

9.3 Sight glasses

Also mind when mounting or replacing:
▶ Tighten sight glasses only with calibrated torque
spanner to indicated torque.
▶ Do not use a pneumatic impact wrench.
▶ Tighten flanges of sight glasses in several steps to
indicated torque.
▶ Check sight glass visually in detail before and after
mounting.
▶ Test changed component for tightness.
Sight glasses with sealing flange
Screw size
M8
M10
Sight glasses with union nut
Size
1 3/4-12 UN
2 1/4-12 UN
①: also prism unit of OLC-D1
AF: width across flats in mm
Screwed sight glass
Size
1 1/8-18 UNEF
②: also prism unit of OLC-D1-S
14 Nm
18 Nm
AF
50 150 Nm ①
65 180 Nm
AF
36 50 Nm ②
53