Servicing The Product - Grundfos MTH Serie Instrucciones De Instalación Y Funcionamiento

4.2.2 Type key
Example MTH 2 -6 /3 -A -W -A -A QQ V
Pump type
3
Rated flow rate [m /h]
Number of chambers
Number of impellers
Pump version
A Basic version
C Inlet pipe
X Special version
Pipe connection
W Internal thread
WB NPT internal thread
Materials
A Basic version
I Stainless steel pump head
Shaft seal
A O-ring seal with fixed seal driver
B Bellows seal, rubber
C O-ring seal with spring as seal driver
R O-ring seal, type A, with reduced
seal faces
A Carbon, metal-impregnated
B Carbon, resin-impregnated
Q Silicon carbide
U Tungsten carbide
V Metal oxides, ceramic
E EPDM
V FKM
10

5. Servicing the product

WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
- Connect the pump to an external main
switch close to the pump and to a
motor-protective circuit breaker or a
CUE frequency converter.
- Make sure you can lock the main switch
in OFF position (isolated). Type and
requirements as specified in EN 60204-
1, 5.3.2.
CAUTION
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.