Drain The Leakage Chamber; Coolant Change - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

9.5.4.3 Testing the resistor of the exter-
nal electrode for sealing chamber
control
9.5.5

Drain the leakage chamber

-
Fig. 9: Drain the leakage chamber
9.5.6

Coolant change

Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Maintenance and repair
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the oil – change the oil!
- Drain off the leakage
‡
Protective equipment has been put on!
‡
Pump is removed and cleaned (if necessary decontaminated).
1. Place the pump upright on a firm surface.WARNING! Risk of hands being crushed.
Make sure that the pump cannot fall over or slip!
2. Place a suitable tank to collect the operating fluid.
3. Unscrew the screw plug slowly (-) but do not unscrew it completely. WARNING! Over-
pressure in the motor! If you hear hissing or whistling sounds, do not turn any fur-
ther! Wait until the pressure has fully dissipated.
4. After the pressure has dissipated, fully unscrew the screw plug (-) and drain the operat-
ing fluid.
5. Clean the screw plug (-), replace the seal ring and screw it back in. Max. tightening
torque: 8 Nm (5.9 ft·lb)!
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up inside the motor! This pressure escapes when
opening the screw plugs. Screw plugs opened carelessly can be ejected at high speed! To
avoid injuries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew screw plugs slowly but never fully. As soon as the pressure escapes (audible
whistling or hissing of air), do not turn any further!
• When the pressure has fully dissipated, fully unscrew screw plugs.
• Wear closed safety goggles.
WARNING
Scalding due to hot operating fluids!
When the pressure escapes, hot operating fluid can also be ejected. This can result in
scalding! To avoid injuries, the following instructions must be observed:
• Allow the mixer to cool to ambient temperature, then open the screw plugs.
• Wear closed safety goggles or face protection as well as gloves.
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