Replacing Components; Removing The Pump Head; Fitting The Pump Head - Grundfos UPS 200 Serie Instrucciones De Instalación Y Funcionamiento

7. Replacing components

7.1 Removing the pump head

1. Disconnect or TURN OFF the power supply.
2. Close any isolation valves on either side of
the pump to avoid draining the system of
liquid.
3. Disconnect the electrical leads from the
terminal box.
4. Disconnect and remove the conduit from the
terminal box.
5. Loosen and remove the four allen-head
screws (8 or 10 mm) which connect the
pump head housing 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
Allen-head
screws (4)
Pump head housing
Fig. 20 Removing and fitting the pump head

7.2 Fitting the pump head

1. Carefully remove the new pump head
assembly 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 housing over
the rotor and rotate it so the terminal box is
in the position you wish, see section
under Terminal box
O-ring
4.1
position.
Bearing plate
Impeller/rotor
assembly
Grooves
Thrust bearing
6. Make sure the pump head housing 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 allen-head screws evenly
to secure the pump head.
Torque:
8 mm: 15 ft lb
10 mm: 25 ft lb.
7. Check to make sure the motor shaft turns
freely, as explained in section
under Rotating the terminal
Pump housing
4.1
box.
19