Dismantling And Assembly; General Information; Removing The Control Box Cover; Removing The Pressure Tank - Grundfos SCALA 2 Service Instruction

5. Dismantling and assembly

5.1 General information

DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
5.1.1 Before dismantling
• Disconnect the power supply to the motor.
• Remove the power cable in accordance with local regulations.
• Open a tap to release the pressure in the pipe system.
• Gradually loosen the non-return valve (65a) to release the
pressure in the pump.
• Remove the drain plug (7) to drain the pump.
5.1.2 Before assembly
• Always replace gaskets and O-rings when you overhaul the
pump.
• Clean and check all parts.
• Replace defective parts.

5.2 Removing the control box cover

Always use an antistatic service kit when handling
electronic components. This will prevent static
electricity from damaging components.
1. Remove the six pan-head torx screws in the cover (164a).
2. Carefully lift off the control box cover and disconnect the HMI
plug.
Removing the control box cover
Fig. 2
Disconnecting the HMI plug
Fig. 3

5.3 Removing the pressure tank

1. Slowly unscrew the non-return valve (65a) to release any
pressure in the pump.
2. Remove the drain plug (7).
3. Remove the union nut (100) by turning it counterclockwise by
hand.
4. Pull out the nipples (100a).
5. Pull out the non- return valve (65) from the inlet.
6. Remove the O-rings from the nipples, valves and plugs.
7. Carefully remove the pump cover (403) using a flat-blade
screwdriver.
To avoid damage to the connection part, insert the
flat-blade screwdriver in the top slots and pop the
cover loose by moving the screwdriver handle
towards the pump body. See fig. 4.
Removing the cover
Fig. 4
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