7.2 Tightening torques
7.2 Tightening torques
See the recommended torque for tightening the bolts in
Table 4: Tightening torques for bolts grade 8.8 (EN
on page 42. All bolts used are grade 8.8 according to EN ISO 898-1. Do not use other type of
bolts. For motors and related components, follow the torques given in the separate motor manual. Use max 50
Nm torque for the bolts fastening the impeller to the motor shaft.
Table 4: Tightening torques for bolts grade 8.8 (EN ISO 898-1)
Size
Torque (Nm)
M6
9.5
M8
20.0
M10
30.0
M12
50.0
M16
120.0
For the standard service switch (KEM 16-40A), the tightening torque for the cover screws (PZ2/1x5-7) is max
2.0 Nm. For electric connections, the max torque for the screws PZ2/1x5 is 1.8 Nm.
7.3 Positioning
7.3.1 Individual units
Position air cooled liquid coolers so that there is no obstruction to the air flow and that hot air recirculation
does not occur.
Direct the units' air flow away from the wind blowing against them. This concerns especially the horizontal air
flow models and models with low rpm fans.
When necessary, use fairings.
In dimensioning, take into account the actual site temperature in the sun. Also note the effect of snow for the
installation level of the unit.
Note:
Contact the manufacturer for further information on positioning the forced draught fans (FD).
©
Alfa LU-VE, Rev-04
42
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
