Wilo HC 20.1 + EMU FA Serie Manual De Instrucciones página 184

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max
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Fig. 10: Check the coolant
184
Maintenance and repair
WARNING
Scalding from hot operating fluids!
Hot operating fluids can also spray out when pressure is released. This can result in
scalding! To avoid injuries, the following instructions must be observed:
• Allow the motor to cool down to the ambient temperature before opening the
screw plugs.
• Wear closed safety goggles or face protection and gloves.
1 Overpressure valve
2 Interior hexagonal head screw for motor cover fixation
- Drain the coolant
2
‡
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.
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 in a crosswise
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manner.
8. Remove the motor cover.
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 spe-
cified coolant P35 for topping up! Note the information on the permissible
concentrates 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!
WILO SE 2019-01