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13 - MAINTENANCE
Figure 44 - Replacing the pump motor
13.7 - Circulator
pump motor
replacement
To replace the circulator pump follow
the steps below while, refering to
fi gure 44:
1. follow the steps in section 13.10 to
2. follow the steps in section 13.2
3. remove screws "B";
4. remove the circulator pump motor
5. label the electrical wires of the
6. disconnect the electrical wires from
7. install the new circulator pump
8. open the heating system isolation
9. follow the steps in section 11.1.3
NOTE: If display shows L05 reverse
polarity (phase and neutral) to the
pump
13.8 - Expansion
tank pressure
To check the expansion tank pressure
follow the steps below:
1. follow the steps in section 13.10 to
2. follow the steps in section 13.2,
3. check the pressure of the
62
isolate and drain the water from the
boiler;
to gain access the internal
components;
"A";
circulator pump motor, phase and
neutral must be respected;
the circulator pump motor
motor and reassemble the boiler
valves and heating system fi ll valve
to bleed the air from the heating
system.
isolate and drain the water from the
boiler
to gain access the internal
components;
expansion tank, item "4" of fi gure
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.
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