
P.064
MOTOR HEAD MODULEX HYBRID
3 - Instructions for motor replacement
A. Disconnect the nain power switch of the
electric system.
B. Make sure there is a real power failure
using a voltmeter.
C. Disconnect the supply wires of the old
circulator
D. Close the power tap oft he water in the
heating system
E. If the circulator is equipped with
shut-off valves at the inlet and outlet, close
it. If there are none, the system must be
completely emptied.
F. Once empty with appropriate Allen key
diam 4-5 with T handle :
loosen the four bolts (in some cases only
two) fixing the motor to the pump body.
G. Let out the remaining water.
H. Loosen and remove the fixing bolts
completely, witout throwing them away,
and remove the faulty motor.
I. Insert the new motor in flange, inserting
one or two washers provided in the package
between the motor flange and the body.
ATTENTION: in some models of old circulator
bodies it is necessary to apply a second washer
to avoid the impeller rubbing on the pump body.
It is therefore necessary, before fixing the bolts,
to check in advance that the coupling does not
cause the impeller to rub on the body, in which
case you will insert a second spacer washer.
Most frequently encountered when using 1 mm
washers.
●Wilo: no washers
●Grundfos: - Bodies in cast iron: no washers
- Bodies in plastic: 1 or 2 washers
J. Insert the bolts and tighten them
completely
K. Use the appropriate Allen key to tighten the
bolts progressively with the corresponding
counter elements.
L. Open the circulator shut-off valves, if
present.
M. Open the water supply tap of the heating
system until the defined filling is reached.
N. Check that there are no leaks between
pump flange and motor.
O. Connect the wiring in the supply box of the
new motor.
P. At the end oft he motor replacement it is
advisable to set correctly the function of
the circulator with button (fig. 1 ref. 6) as
specified in the following pages.
The function of the motor/circulator is factory
pre-set in CS mode - constant speed.
If after having removed the motor, you notice on the old body of the circulator the
presence of sludge, fine sand due to the crystallization formed by mineral salts
(manganese, iron, calcium or others) or similar dirt, it is advisable to perform or
to have performed the total washing of the system, in order to avoid a possible
and repeated blockage of the motor.
9 UK