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

7. Replacing components

Warning!
Before starting any work on this
circulator, make sure electrical
supply has been switched off and
that it cannot be accidentally
switched on.

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. Remove the vent plug to relieve any
system pressure retained in the pump.
Exercise caution as the fluid may be
scalding hot and under pressure. Only
after the pressure has been relieved and the
pump drained should you proceed with the
next steps.
4. Disconnect the electrical leads from the
terminal box.
5. Disconnect and remove the conduit from the
terminal box.
6. Loosen and remove the four 5 mm
allen-head screws which connect the pump
head housing to the pump housing.
7. Remove the pump head from the pump
housing. Exercise care as the rotor may
fall out of the stator or pump housing.
8. Clean the machined surfaces in the pump
housing of any foreign material.
Allen
screws
(4) 5 mm
Pump head/stator housing
Fig. 17 Removing and fitting the pump head
14

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 plate,
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. Ensure 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
4.2.1 Rotating the terminal box.
6. Ensure that 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. Cross-tighten the allen-head screws
evenly.
Torque to: 7 ft lb / 9.5 Nm.
7. Check to make sure the rotor turns freely. Do
this by removing the vent plug in the middle
of the pump nameplate. Insert a
medium-size, flat-blade screwdriver into the
slot at the exposed end of the shaft. Gently
turn the shaft. If it does not turn easily,
repeat steps 1 through 6 above.
If the rotor spins freely, proceed to step 8. Do
not put the vent plug back into the pump until
the end of step 10.
8. The position of the nameplate can be
changed by easing the outer edge of the
plate at the cutout with a screwdriver. Turn
the nameplate to the required position and
push into place.
9. Follow electrical instructions in section
3.3 Electrical connection.
10. Refill the system, open the isolation valves
and vent the system. Also allow air to vent
out of the pump, once water flows out the
vent hole, replace the vent plug removed in
step 7. See additional instructions in
section 4.1 Vent the piping system.
Bearing plate
Terminal box
O-ring
Thrust bearing
Rotor assembly
Impeller
Pump housing