Grundfos CM series, Service Instructions Manual

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English (GB) Service instructions
Original service instructions
Table of contents
1. General information . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Hazard statements . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Type identification . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Type key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Key to codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Tightening torques and lubricants . . . . . . . . . . . . . . . 8
4. Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Standard tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Torque tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5. Dismantling and assembly . . . . . . . . . . . . . . . . . . . 10
5.1 General information . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 CM 1, 3, 5, cast iron . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 CM 1, 3, 5, stainless steel . . . . . . . . . . . . . . . . . . . . 12
5.4 CM 10, 15, 25, cast iron. . . . . . . . . . . . . . . . . . . . . . 14
5.5 CM 10, 15, 25, stainless steel . . . . . . . . . . . . . . . . . . 15
5.6 MG 71 and MG 80 motors . . . . . . . . . . . . . . . . . . . . 17
5.7 MG 90, MG 100, MG 112 and MG 132 motors . . . . . . . . 17
5.8 Checking and replacing impellers and chambers . . . . . . 18
5.9 Replacement of impellers and spacing pipes . . . . . . . . . 18
6. Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 The pump does not run.. . . . . . . . . . . . . . . . . . . . . . 19
6.2 Motor-protective circuit breaker has tripped (trips out
immediately when supply is switched on).. . . . . . . . . . . 19
6.3 The motor-protective circuit breaker trips out
occasionally.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.4 The motor-protective circuit breaker has not tripped out,
but the pump is inadvertently out of operation. . . . . . . . . 21
6.5 The pump performance is unstable. . . . . . . . . . . . . . . 21
6.6 The pump runs, but gives no water. . . . . . . . . . . . . . . 21
6.7 The pump runs backwards when switched off. . . . . . . . . 21
6.8 The pump runs with reduced performance. . . . . . . . . . . 21
7. Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 CM 1, 3, 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2 CM 10, 15, 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8. Order of assembly for chambers and impellers . . . . . 26
8.1 Key for CM 1, 3, 5 . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.2 CM 1, 3, 5, cast iron . . . . . . . . . . . . . . . . . . . . . . . . 26
8.3 CM 1, 3, 5, stainless steel . . . . . . . . . . . . . . . . . . . . 26
8.4 Key for CM 10, 15, 25 . . . . . . . . . . . . . . . . . . . . . . . 27
8.5 CM 10, 15, 25, cast iron. . . . . . . . . . . . . . . . . . . . . . 27
8.6 CM 10, 15, 25, stainless steel . . . . . . . . . . . . . . . . . . 28
1. General information
Read this document before you install the product. Instal-
lation and operation must comply with local regulations
and accepted codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may appear in Grundfos
installation and operating instructions, safety instructions and
service instructions.
DANGER
Indicates a hazardous situation which, if not avoided, will
result in death or serious personal injury.
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious personal injury.
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate personal injury.
The hazard statements are structured in the following way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
•
Action to avoid the hazard.
1.2 Notes
The symbols and notes below may appear in Grundfos installation
and operating instructions, safety instructions and service
instructions.
Observe these instructions for explosion-proof products.
A blue or grey circle with a white graphical symbol indi-
cates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with a
black graphical symbol, indicates that an action must not
be taken or must be stopped.
If these instructions are not observed, it may result in mal-
function or damage to the equipment.
Tips and advice that make the work easier.
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English (GB)