Instruction manual

64
13 - MAINTENANCE
13.8 - Circulator
pump motor
replacement (only
for 45WN and
45WE models)
To replace the circulator pump follow
the steps below while, refering to figure
49:
 follow the steps in section 13.11 to
isolate and drain the water from the
boiler;
 follow the steps in section 13.3 to
gain access the internal
components;
 remove screws “B”;
 remove the circulator pump motor
“A”;
 label the electrical wires of the
circulator pump motor, phase and
neutral must be respected;
 disconnect the electrical wires from
the circulator pump motor
 install the new circulator pump
motor and reassemble the boiler
 open the heating system isolation
valves and heating system fill valve
 follow the steps in section 11.1.3 to
bleed the air from the heating
system.
NOTE: If display shows L05 reverse
polarity (phase and neutral) to the
pump
13.9 - Expansion
tank pressure (only
for 45WN and
45WE models)
To check the expansion tank pressure
follow the steps below:
 follow the steps in section 13.11 to
isolate and drain the water from the
boiler
 follow the steps in section 13.2 or
13.3, to gain access the internal
components;
 check the pressure of the expansion
tank, item “4” of figure 1 (The air
inlet probe is on the top of the
expansion tank). It must be 14 psi
(1 bar). If the pressure is lower
recharge the expansion tank while
letting the water run out of the
heating system drain valve.
Figure 49 - Replacing the pump motor (only for 45WN and 45WE
models)