Oil Change In Sealing Chamber - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

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max
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Fig. 10: Check the coolant
9.5.7

Oil change in sealing chamber

40
Maintenance and repair
1 Overpressure valve
2 Interior hexagonal head screw for motor cover fixation
- Drain the coolant
2
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Pump is not installed.
‡
Pump is not connected to the mains.
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Protective equipment must be put on!
1. Place the pump on a firm surface in a vertical position. WARNING! Risk of hands being
crushed. Make sure that the pump can not fall over or slip!
2. Position a suitable tank to collect the operating fluid.
3. To vent possible overpressure, unscrew the overpressure valve by around 3-4 turns.
WARNING! Overpressure in motor! Stop turning the screw plug further if hissing or
whistling is audible! Wait until the pressure has completely dissipated.
4. Once the overpressure has vented, unscrew the overpressure valve completely.
5. Change the seal ring and O-ring on the overpressure valve.
6. Screw the overpressure valve back in. Max. tightening torque: 55 Nm (40.5 ft·lb)!
7. Unscrew the interior hexagonal head screws on the motor cover diametrically opposite.
8. Remove the motor cover.
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9. Unscrew screw plug (-) and drain the operating fluid. If a ball valve is installed on the
outlet opening, open the shut-off ball cock.
10.Check the operating fluid: Notify customer service if the operating fluid contains metal
swarf!
11.To drain the cooling system completely, rinse it thoroughly with clean water.
12.If a ball valve is installed on the outlet opening, close the shut-off ball cock.
13.Clean the screw plug (-), replace the seal ring and screw it back in. Max. tightening
torque: 8 Nm (5.9 ft·lb)!
14.Pour the new operating fluid in through the motor opening.
15.Two marks are worked into the inside of the housing. The operating fluid must be filled
up to the upper "max." mark.
⇒ Observe the information on operating fluid type and quantity!
NOTICE! To ensure long-term frost and corrosion protection, use the specified
coolant P35 for topping up! Note the information on the permissible concen-
trates and mixing ratio !
16.Clean the motor cover and renew the O-ring.
17.Place the motor cover on the motor housing and re-tighten the interior hexagonal head
screws. Max. tightening torque: see appendix!
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.
WILO SE 2019-01