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7.3 Removing the circulation pump
1. Disconnect the power supply and secure against
reconnection.
2. Remove the pump unit front cover.
3. Close the shut-off valves.
4. Disconnect the circulation pump wiring.
5. Undo the flange and remove the circulation pump.
Severe scalding from hot water!
• Allow the pump unit to cool down before
carrying out maintenance work.
• Do not put hands into hot medium when
draining the pump unit.
7.4 Installing the circulation pump
1. Replace damaged or defective seals if necessary.
2. Insert the circulation pump and tighten the flange (see
"Technical features" on page 3 for tightening torques).
3. Connect the circulation pump wiring.
4. Slowly open the ball valve using the lever.
5. Slowly pressurise the pump unit and bleed the system if
necessary.
6. Check the seals on the pump unit are not leaking.
7. Reconnect the power supply to the pump unit.
8. Refit the front cover.
IM-HKM40-50_HK40-50-DE-W-UK-12-2019-Rev.1 | Part no. 10083684
7.5 Removing the 3-way mixing valve (HKM
only)
1. Disconnect the power supply and secure against
reconnection.
2. Remove the pump unit front cover.
3. Close the shut-off valves.
4. Move the regulating insert (spindle) to centre position using
the lever on the actuator.
5. Remove the actuator.
9 Instructions for fitting/removing the actuator can be
found in the relevant manufacturer's manual.
6. Loosen the bolts and remove the 3-way mixing valve.
7.6 Fitting the 3-way mixing valve (HKM only)
1. Replace damaged or defective seals.
2. Fit the 3-way mixing valve and tighten the bolts.
3. Fit the actuator.
4. Slowly open the ball valve using the lever.
5. Reconnect the power supply to the pump unit.
6. Refit the front cover.
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