English
10 WILO SE 03/2015
WARNING! Risk of injuries to personnel and property damage!
The flange connection can be damaged and develop leaks if the pump is not installed
correctly. There is a risk of injury and damage to property due to hot fluid escaping.
• Never connect two combination flanges to each other!
• Pumps with combination flanges are not suitable for PN16 operating pressures.
• The use of securing elements (e.g. spring rings) can result in leaks at the flange con-
nection. They are therefore not permitted. The washers supplied (fig. 3b, item 1) must
be inserted between screw/nut heads and the combination flange.
• The permissible tightening torques listed in the table below must not be exceeded,
even if screws of higher strength (≥ 4.6) are used, since otherwise splintering can
occur at the edges of the long holes. This causes the screws to lose their pretension
and the flange connection can become leaky.
• Use screws of sufficient length. The screw thread must protrude at least one thread
turn beyond the nut (fig. 3b, item 2).
fig.
• Install appropriate flat gaskets between pump and counter flanges.
• Tighten the flange bolts crosswise in two steps to the prescribed tightening torque
(see Table 7.1.2).
• Step 1: 0.5 x permissible tightening torque
• Step 2: 1.0 x permissible tightening torque
• Check the flange connections for leaks.
7.1.3 Pump insulation in heating, refrigeration and air-conditioning systems
WARNING! Risk of burns!
The entire pump can become very hot. When retrofitting the insulation during normal
operation there is a risk of burns.
• Thermal insulation shells (optional accessories) are only permissible in heating applica-
tions with fluid temperatures starting from +20°C, since these thermal insulation shells
are not diffusion-proof when enclosing the pump housing. Install a thermal insulation
shell before commissioning the pump.
• For refrigeration system and air-conditioner applications, use commercially available dif-
fusion-proof insulation materials.
DN 32, 40, 50, 65 Nominal pressure PN6 Nominal pressure PN10/16
Screw diameter M12 M16
Strength class 4.6 or higher 4.6 or higher
Permitted tightening torque 40 Nm 95 Nm
Min. screw length for
• DN 32/DN 40 55 mm 60 mm
• DN 50/DN 65 60 mm 65 mm
DN 80, 100 Nominal pressure PN6 Nominal pressure PN10/16
Screw diameter M16 M16
Strength class 4.6 or higher 4.6 or higher
Permitted tightening torque 95 Nm 95 Nm
Min. screw length for
• DN 80 65 mm 65 mm
• DN 100 70 mm 70 mm