Grundfos MTH 12, Installation And Operating Instructions Manual

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6
CONTENTS
Page
1. Applications 6
2. Type designation 6
2.1 Type key 6
3. Technical data 6
4. Installation 6
4.1 Suction conditions 7
5. Electrical connection 7
6. Start-up 7
7. Operation and maintenance 8
7.1 Lubrication and maintenance 8
7.2 Filters 8
7.3 Periodic checks 8
8. Service 8
9. Sound pressure level 9
10. Fault finding chart 10
11. Disposal 10
1. Applications
The Grundfos pumps, type MTH, are multistage
centrifugal pumps designed for pumping liquids for
machine tools, condensate transfer, liquid transfer
in industrial washing machines and similar applica-
tions.
The pumps are designed for pumping liquids with
a density and viscosity corresponding to those of
water. The pumped liquid must not contain abrasive
particles or fibres.
When pumping liquids with a density or viscosity
higher than that of water, the motor size should be
taken into consideration.
2. Type designation
The standard range of pumps encompasses com-
plete impeller in chamber combinations. On request,
other lengths, against duty combinations, can be
supplied by fitting empty intermediate chambers
instead of standard chambers with impellers.
The pump key on the pump nameplate indicates the
number of chambers and impellers fitted to the
pump.
2.1 Type key
3. Technical data
4. Installation
The pump is designed for tank mounting in vertical
position. The pump is positioned in a hole cut into
the cover of the tank (upper side) and is secured to
the tank by four hexagon head screws through the
holes in the mounting flange. It is recommended to fit
a sealing gasket between the pump flange and tank.
Note: MTH 2 and 4 can only be mounted vertically.
Fig. 1 Dimensional sketch
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local regula-
tions and accepted codes of good prac-
tice.
The pump must not be used for the trans-
fer of inflammable liquids such as diesel
oil, petrol or similar liquids.
Example MTH 4 - 20 / 2 -x -x -x -xxxx
Pump range
Nominal flow rate in m
3
/h
Number of stages x 10
Number of impellers
Code for pump version
Code for pipework connection
Code for materials
Code for shaft seal and rubber pump parts
Pump type MTH
Minimum liquid temperature [°C] –10
Maximum liquid temperature [°C] +90
Maximum ambient temperature [°C] +40
Maximum operating pressure [bar] 10
Enclosure class IP 54
The pump must be installed so that per-
sons cannot accidentally come into con-
tact with the hot surface of the motor.
TM
00
43
75
52
98
L
c
4 x X
D1
D2
D3