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7.2
Getting started
The pump must not run dry as this can result in the
$77(17,21
destruction of the bearing in a very short time. Fill it with
liquid before first start-up.
Before starting, the system must be:
- Rinsed thoroughly to prevent the presence of foreign objects and
impurities which could block the pump.
- Fully filled with the pumped media (water or water-glycol mix).
8.
Maintenance/Disassembly
Pumps are subject to wear. If the pump is blocked (see section 9) or
grinding noises are audible, check the pump and replace it if
necessary. Procedure:
- Disconnect the pump from the mains.
- Shut off supply and drain lines. If there are no shut-off
devices, drain the system so that the fluid level is
beneath that of the pump.
- Loosen the union nut by hand or with an appropriate
tool (such as a strap wrench) and carefully pull the
motor out of the pump housing.
Residual water may leak out of the rotor cavity. Prevent
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the pump's electrical connection from getting wet.
For figure 4:
- Carefully but firmly pull the rotor / impeller upward by hand and
remove it.
- If necessary, remove foreign bodies and impurities/deposits with
appropriate agents. Reinsert the rotor / impeller.
- The bearing is worn if the rotor / impeller cannot be freely moved or if
wear marks are visible. In this case, replace the rotor, the pump
motor, or the entire pump.
6
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