Removing The Pump - Worcester Greenstar 4000 Installation And Maintenance Instructions Manual

Variant with screws
Checking 3-way valve motor.
▶ Carry out function check of 3-way valve motor in Function check
menu.
– Service menu > Function check > Activate test
valve > Hot water.
Detaching the motor.
▶ Set the 3-way valve to mid position.
– Service menu > Settings > Special function > 3-WV mid. pos.>
Yes.
The 3-way valve remains at the middle position for approx. 15 minutes.
▶ Detach the motor in the sequence shown.
– Unplug the plug.
– Remove the screws.
– Pull on the motor gently and lift it up.
– Remove the motor.
2. 2.
2. 2.
1.
Fig. 91 Detaching the motor from the 3-way valve (variant with screws)
Installing the motor.
When suspending the motor, do not push against the ball head, as it will
be hard to pull it out again.
▶ Install the motor in the sequence shown.
– Lower the new motor from above and suspend it from the ball
head.
– Push the motor in and fasten it in place using 2 screws.
– Connect the plug.
1) When the Function Check menu is entered only Burner will be visible for the first
10 seconds, after this period of time the other components that can be tested
will appear in the menu. Components such as HC1 pump, DHW circulation pump
and Solar pump will show if connected to the control board.
Greenstar 4000 – 6 720 891 161 (2020/09)
1)
> 3-way
4. 4. 4.
4mm
3.
0010031702-001
3. 3. 3.
4.
3. 3.
Fig. 92 Installing the motor in the 3-way valve (variant with screws)
9.6

Removing the pump

▶ Unplug the electrical connections [4].
▶ Release the ratchet connection [1] between pump and heat
exchanger assembly.
▶ Loosen the securing screws [3].
▶ Remove pump assembly [2].
3
4
3
3
Fig. 93 Removing the pump
▶ Install the pump in reverse order.
Replacement parts
1. 1. 1.
1. 1. 1.
2.
0010031703-001
1
2
67