Wilo HC 20.1 E3 Series - Page 19

Installation and electrical connection en
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 19
1. Place the pump upright on a firm surface. WARNING!Risk of hands being crushed.
Ensure that the pump cannot fall over or slip away!
2. Carefully and slowly reach into the hydraulics housing through the pressure port
and rotate the impeller.
6.4.2.2 Check the coolant
- -
1
2
max
Fig.4: Check the coolant
1 Overpressure valve
2 Interior hexagonal head screw for motor cover fixation
- Drain the coolant
‡ Pump is not installed.
‡ Pump is not connected to the mains.
‡ 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 to 4
turns.
CAUTION!Do not unscrew the overpressure valve completely!
4. Once the overpressure has vented, screw the overpressure valve back in. Max.
tightening torque: 55Nm (40.5ft·lb)!
5. Unscrew the interior hexagonal head screws on the motor cover in a crosswise
manner.
6. Remove the motor cover.
7. Two marks are worked into the inside of the housing. The operating fluid must
reach the upper “max.” mark. If there is not enough operating fluid, fill the operat-
ing fluid up to the marking. Note information on operating fluid type, see chapter
“Maintenance and repair”.
8. Take a sample of operating fluid using a test pipette.
9. Check the operating fluid:
⇒ If the operating fluid is clear, continue to use the operating fluid.
⇒ If the operating fluid is contaminated (cloudy/dark), add new operating fluid,
see chapter “Maintenance and repair”. Dispose of operating fluid in accord-
ance with local regulations!
⇒ Notify customer service if the operating fluid contains metal swarf!
10.Clean the motor cover and renew the O-ring.
11.Place the motor cover on the motor housing and re-tighten the interior hexagonal
head screws. Max. tightening torque: see appendix!