Pump Insulation In Heating, Refrigeration And Air-Conditioning Systems - Wilo Yonos MAXO-D Installation And Operating Instructions Manual

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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.
DN 32, 40, 50, 65
Screw diameter
Strength class
Permitted tightening torque
Min. screw length for
• DN 32/DN 40
• DN 50/DN 65
DN 80, 100
Screw diameter
Strength class
Permitted tightening torque
Min. screw length for
• DN 80
• DN 100
• 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.
10
Nominal pressure PN6
M12
4.6 or higher
40 Nm
55 mm
60 mm
Nominal pressure PN6
M16
4.6 or higher
95 Nm
65 mm
70 mm
Nominal pressure PN10/16
M16
4.6 or higher
95 Nm
60 mm
65 mm
Nominal pressure PN10/16
M16
4.6 or higher
95 Nm
65 mm
70 mm
WILO SE 03/2015