Wilo Pump TOP-S25/10

8.2 Rotation direction monitoring

Verify the following conditions for three-phase pumps

Is the direction of rotation light green when the pump is briefly switched on?

If the direction of rotation is incorrect, was the pump electrically isolated and two phases interchanged in the terminal box before restarting?

Ensure all poles of the power supply are disconnected before working on the pump

Wait 5 minutes before commencing work on the module for 1~ systems to allow hazardous voltages to dissipate

Electrical Connection Verification

Verify that all connections, including potential-free contacts, are voltage-free

Is the module/terminal box undamaged?

Does the current type and voltage of the mains connection correspond to the specifications on the rating plate?

Ensure the electrical connection is established via a fixed connection line with a connector device or an all-pole switch with a contact opening width of at least 3 mm

Verify mains-side fuse protection is 10 A, slow

Verify installation and connection

Is the sealing screw including the flat gasket in place?

Prime and vent the unit correctly

Is the pump rotor compartment vented automatically after a short operating period?

Is dry running for short periods permissible?

Ensure motor head, differential pressure screw, and flange connection/threaded pipe union are not removed for venting

7.1.3 Insulation of the pump in cooling/air-conditioning systems

Verify that the two half-shells of the thermal insulation are correctly fitted

Check that the guide pins are engaged in the opposite holes

For cooling/air-conditioning systems, verify that commercially-available diffusion-proof thermal insulation materials are used instead of the supplied shells

9.1 Dismantling/installation of the motor

Read the relevant chapters before maintenance

Comply with safety instructions

Close check valves on both sides of the pump before dismantling the motor

Allow the pump to cool to room temperature

Drain the isolated branch of the system

Drain the entire system if no check valves are fitted

Observe manufacturer's information and safety data sheets on possible additives