Inspecting And Adjusting The Impeller Clearance; Pressure Version; Maintaining Explosion-Proof Se, Sl Pumps; Contaminated Pumps - Grundfos SE Instrucciones De Instalación Y Funcionamiento

8.2 Inspecting and adjusting the impeller clearance

Check the impeller clearance every time service is
carried out to prevent hot surfaces in the hydraulic
parts.

Pressure version

E = Extra-low pressure
L = Low pressure
M = Medium pressure
H = High pressure
S = Super-high pressure
Impeller clearance table
DANGER
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.
The impeller clearance of installation types S and C can be
inspected directly through the pump inlet.
Installation types D and H can be inspected and adjusted with the
pump installed on the base stand and connected to the pipes.
8.2.1 Adjusting the impeller clearance
1. Loosen the set screws by two full turns each.
2. Close the impeller clearance by lightly tightening the fastening
screws diagonally until the impeller touches the pump
housing.
Do not use too much force when tightening the
fastening screws as this may damage the bearings.
The movement is usually 0.04 to 0.12 in (1 to 3 mm).
3. Loosen the fastening screws to make the correct gap under
the heads of the fastening screws. See fig. 18. Use the
clearance stated in the impeller clearance table above.
4. Tighten the set screws tightly. Torque: See service instruction.
5. Tighten the fastening screws diagonally.
Set screw
Fastening screw
Fig. 18 Impeller clearance adjustment.
20
Impeller clearance X
[in (mm)]
0.035 ± 0.004 (0.9 ± 0.1)
0.035 ± 0.004 (0.9 ± 0.1)
0.023 ± 0.004 (0.6 ± 0.1)
0.023 ± 0.004 (0.6 ± 0.1)
0.019 ± 0.004 (0.5 ± 0.1)
Fastening screw

8.3 Maintaining explosion-proof SE, SL pumps

Overhauled and repaired explosion-proof pumps are marked with
a repair plate giving the following information:
• the repair symbol R
• name or registered trade mark of the repairing workshop
• workshop reference number relating to the repair
• date of overhaul or repair.
In the event of subsequent repairs, the existing repair plate must
be replaced by a new updated plate and earlier markings must be
recorded.
The repairing workshop must keep records of performed
overhauls and repairs together with records of all previous
overhauls, repairs and possible modifications. Copies of the
repairing workshop's detailed records must be filled by the owner
or operator together with the original type certificate of the
explosion-proof motor in question.
8.3.1 Motor cable
Use only cables which are approved by the manufacturer and
suitable for the cable entry as to diameter, number of leads,
conductor cross section and sheath material.
8.3.2 Cable entry
Use only FM-approved cable entry parts corresponding to the
cable diameter. The correct cable dimension marking is stamped
on the cable entry.
8.3.3 Spare parts
Damaged motor parts, such as top cover and cable entry, must
always be replaced by new and approved parts. Motor parts must
not be reconditioned by machining, re-tapping, welding, etc.

8.4 Contaminated pumps

CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with clean water and
rinse the pump parts in water after dismantling.
The product will be classified as contaminated if it has been used
for a liquid which is injurious to health or toxic.
If you request Grundfos to service the product, contact Grundfos
with details about the pumped liquid before returning the product
for service. Otherwise, Grundfos can refuse to accept the product
for service.
Any application for service must include details about the pumped
liquid.
Clean the product in the best possible way before you return it.
Costs of returning the pump are to be paid by the customer.