SB-110-4
56
▶ Install components from which refrigerant may leak
(e.g. low and high pressure limiter or low and high
pressure cut-out) only outside the switch cabinet!
▶ Only use tools and devices that are suitable for A2L
refrigerants. See also A-541 (HTML).
9.3
Disposing of the compressor
Drain the oil from the compressor. Dispose of waste oil
properly! Have the compressor repaired or dispose of it
properly!
When returning compressors that have been operated
with flammable refrigerant, mark the compressor with
the symbol "Caution flammable gas", as the oil may still
contain refrigerant.
10 Mind when mounting or replacing
WARNING
The system is under pressure!
Serious injuries are possible.
Wear safety goggles!
Assess the risk of intervention and take appropriate
measures, for example: wear additional personal pro-
tective equipment, shut off system or shut off the valves
before and after the respective system part and depres-
surise.
Before mounting
▶ Clean threads and threaded bores carefully.
▶ Use new gaskets only!
▶ Do not oil gaskets with metallic support.
▶ Flat gaskets may be moistened slightly with oil.
Admissible screwing methods
• Tighten with calibrated torque spanner to indicated
torque.
• Tighten with pneumatic impact wrench and retighten
with calibrated torque spanner to indicated torque.
• Tighten with electronically controlled angled wrench
to indicated torque.
Tolerance range of tightening torques: ±6% of nominal
value
Flange connections
▶ Tighten them crosswise and in at least 2 steps
(50/100%).
10.1 Screwed connections
Metric screws
Size
Case A
Case B
M5
7 Nm
M6
9 Nm
16 Nm
M8
23 Nm
40 Nm
M10
42 Nm
80 Nm
M12
80 Nm
125 Nm
M16
150 Nm
220 Nm
M20
220 Nm
220 Nm
M20 with CS.105
400 Nm
Case A: Screws without flat gasket, property class 8.8
or 10.9
Case B: Screws with flat gasket or gasket with metallic
support, property class 10.9
Metric screws of shut-off valves and counter
flanges
Size
Case C
Case D
M10
50 Nm
M12
36 Nm
100 Nm
M16
98 Nm
150 Nm
M18
136 Nm
200 Nm
M20
175 Nm
200 Nm
M24
320 Nm
Case C: Screws of property class 5.6
Case D: Screws of property class 8.8. They can be
used for welding flanges as well.
Plugs without gasket
Size
Brass
Steel
1/8-27 NPTF
35 .. 40 Nm
15 .. 20 Nm
1/4-18 NPTF
50 .. 55 Nm
30 .. 35 Nm
3/8-18 NPTF
85 .. 90 Nm
50 .. 55 Nm
1/2-14 NPTF
95 .. 100 Nm
60 .. 65 Nm
3/4-14 NPTF
120 .. 125 Nm
80 .. 85 Nm
Wrap thread with sealing tape before mounting.
