Pos. Component Material EN/DIN
15 Pump housing
Cast iron GG15 EN-GJL-150
Stainless steel 1.4308
Composite PA 6.6 30
%GF
Composite PPS 40 %GF
16 Neck ring Stainless steel 1.4301
17 O-ring EPDM
Description of components
The Grundfos UMP3 pumps are of the canned-rotor type
as pump and motor form an integral unit without shaft seal
and with only one gasket for sealing and four screws for
fastening the stator housing to the pump housing. The
bearings are lubricated by the pumped liquid as the rotor
can is filled with water. The focus has been on using eco-
friendly materials as well as on limiting the number of
materials.
Motor description
The efficiency of the three-phase, 4-pole, synchronous,
electronically commutated permanent-magnet (ECM/PM)
motor type is considerably higher compared to a
conventional asynchronous squirrel-cage motor.
The ECM/PM motor is designed according to the canned-
rotor principle. The design of the mechanical motor
components has mainly focused on these features:
• reliable with stainless steel rotor can in one part and
a specific formed EPDM gasket
• simple design meaning as few components as
possible, each with several functions
• high efficient due to permanent magnets and low-
friction bearings.
The motor is cooled by the pumped liquid which reduces
the sound pressure level to a minimum. Being software-
protected, the pump requires no further motor protection.
Stator housing
The aluminium die-cast stator housing with four fixing
holes is following the design of the well-accepted
Grundfos UP pumps. It enables easy change of motor
positions by removing the four screws holding the stator
housing and turning the housing to the desired position.
There are two versions: one without drain hole as IP44,
and one with one drain hole in two possible positions as
IPX4D. During operation, the drain hole must always point
downwards. UPM3 is IP44 as standard for non-
condensing applications and IPX4D in UPM3 Solar. As K-
variant for condensing applications, the stator housing
IPX4D version is CED electrocoated.
TM059258
Stator housing
Stator and windings
The UPM3 have a three-phase stator with six concentric
positioned in-slot windings.
TM059260
Stator
Rotor can
The rotor can is drawn out of one sheet of stainless steel.
It contains the ground and honed upper radial bearing. On
top the rotor can has a hole on which the deblocking
device is welded.
TM059247
Rotor can with bearing holder and ceramic bearing
Deblocking device
The deblocking device consists of an axial moving plunger
tightened by an O-ring and pulled back by a spring inside
a stainless steel housing that is welded to the rotor can.
The deblocking device is designed for pumps integrated in
appliances to give access to the shaft from the front of the
pump without demounting the control box.
By pushing and turning a screw driver, Phillips No. 2, the
plunger pushes the shaft in axial direction into the pump,
while it can be turned as well. The force is high enough to
deblock pumps which are seized by lime e.g. if an
UPM3
9
36
Technical description
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