Setting Of Level Switch; Start-Up; Maintenance And Service - Grundfos Unilift AP12 Bedienungsanleitung

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Note: Do not lift the pump by means of the electric

cable.

Position the pump so that the suction strainer will not

be blocked or partly blocked by sludge, mud or simi-

lar materials.

In the case of permanent installation, the pit must be

cleared of sludge, pebbles, etc. before the pump is

installed.

It is recommended to place the pump on a solid

base, see fig. 4.

The pump must not be installed hanging from the

discharge pipe.

‹

Fig. 4

4.3 Setting of level switch

For pumps supplied with a level switch, the differ-

ence in level between start and stop can be set by

adjusting the free cable between the level switch and

the pump handle.

The longer the length of free cable, the larger the dif-

ference in level between start and stop.

Maximum length of free cable: 350 mm, see fig. 5.

Minimum length of free cable: 100 mm, see fig. 6.

The stop level must be above the suction strainer to

prevent the pump from taking in air.

Fig. 5

‹

Max. 350 mm

Start

450 mm

Stop

100 mm

Fig. 6

5. Start-up

‹

Note: Before starting the pump, check that the suc-

‹

tion strainer is fitted to the pump and submerged in

the pumped liquid.

Open the isolating valve, if fitted, and check the level

switch setting.

Note: The pump may be run briefly to check the

direction of rotation without being submerged in the

pumped liquid.

6. Maintenance and service

Before starting work on the pump, make

sure that the electricity supply to the pump

has been switched off and that it cannot be

accidentally switched on.

Before carrying out maintenance and service, it must

be ensured that the pump has been thoroughly

flushed with clean water. Rinse the pump parts in

water after dismantling.

Check the pump and replace the oil once a year.

If the pump is used for pumping liquids containing

abrasive particles or it is operating continuously, the

pump must be checked at shorter intervals.

In the case of long operating time or continuous

operation, the oil should be replaced as follows:

Liquid

temperature

20°C

40°C

55°C

Out of consideration for the personal

safety and health, this work must be car-

ried out by specially trained persons. Fur-

thermore, all rules and regulations cover-

ing safety, health and environment must

be observed.

During dismantling, caution should be

exercised as there will be access to sharp

edges, etc. which may cut.

Min. 100 mm

Start

200 mm

Stop

300 mm

The oil should be

replaced after

4500 operating hours

3000 operating hours

1500 operating hours

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Diese Anleitung auch für:

Unilift ap35 Unilift ap50

Setting Of Level Switch; Start-Up; Maintenance And Service - Grundfos Unilift AP12 Bedienungsanleitung

4.3 Setting of level switch

5. Start-up

6. Maintenance and service

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