Replacing Components; Removing The Pump Head; Fitting The Pump Head - Grundfos UP 200 Serie Instrucciones De Instalacion Y Operacion

7. Replacing components

7.1 Removing the pump head

1. Disconnect or TURN OFF the power supply.
2. Close isolation valves on either side of the
pump to avoid draining the system of liquid.
3. Disconnect the leads from the terminal box.
4. Disconnect and remove the conduit from the
terminal box.
5. Loosen and remove the four hex socket
head screws (8 or 10 mm) which connect the
pump head to the pump housing.
6. Remove the pump head from the pump
housing.
7. Clean the machined surfaces in the pump
housing of any foreign material.
Terminal box
Hex socket head
screws (4)
Pump head
Fig. 13 Removing and fitting the pump head

7.2 Fitting the pump head

1. Carefully remove the new pump head from
its packaging. Separate the impeller/rotor
assembly from the new pump head.
2. While holding the thrust bearing, carefully
place the impeller/rotor assembly into the
pump housing. The bearing plate should fit
snugly into the lowest machined surface in
the pump housing.
3. Make sure that the impeller/rotor assembly
can rotate freely.
4. Place the O-ring over the rotor and locate it
into the inner diameter of the pump housing.
5. Carefully place the pump head over the rotor
and rotate it so the terminal box is in the
position you wish, see section
preparation under "Terminal box position".
14
Impeller/rotor
assembly
O-ring
Grooves
Thrust bearing
6. Make sure the pump head is properly seated
on the pump housing.
Do not force the two together - if there is
binding, disassemble them and repeat steps
2 to 6. Tighten the hex socket head screws
evenly to secure the pump head.
Torque to:
8 mm............15 ft lb
10 mm...........25 ft lb.
7. Check to make sure the motor shaft turns
freely, as explained in section
preparation
box".
4.1 Electrical
Bearing plate
Pump housing
under "Rotating the terminal
4.1 Electrical