Frost Protection; Fault Finding Chart - Grundfos BMP series Montage- Und Betriebsanleitung

15.3 Frost protection

Recommended procedure:
1. Disconnect the water supply to the pump/system.
2. Drain the pump by removing the lower drain plug. Fit and
tighten the plug when the pump has been drained of liquid.
3. Connect the suction port (I) to a container with anti-freeze liq-
uid. Connect one end of a hose to the discharge port (O) and
the other to the container.
4. Briefly start and stop the pump.
Note: The pump must not run dry.
5. Drain the pump of anti-freeze liquid by removing the lower
drain plug. Fit and tighten the plug.
The pump is now protected against internal corrosion and frost.
Storage temperature:
–20°C to 70°C (–4°F to 158°F) (factory-filled with anti-freeze liq-
uid).

17. Fault finding chart

Before starting work on the pump, make sure that the electricity supply has been switched off and that it cannot be acciden-
tally switched on.
Fault Possible cause
1. The pump stops during a) No water supply.
operation.
b) The fuses are blown.
c) The motor starter overload unit has tripped
d) The magnetic coil in the motor starter/con-
e) The control circuit has cut out or is defective. Check the control circuit and the contacts in the monitor-
f)
2. The pump runs, but a) No or insufficient water supply at the pump
gives no water or devel-
ops any pressure.
b) The piping system or pump is choked up.
c) The prefilter is clogged.
d) The pump is worn.
e) Wrong direction of rotation.
3. The pump runs at re- a) The pump is partly blocked by impurities.
duced capacity.
b) The pump is defective.
c) The prefilter is clogged.
d) The motor speed is too low.
The low-pressure switch has cut out.
The level switch has cut out.
out.
tactor is defective (not cutting in).
The motor/supply cable is defective.
suction port.
16. Service
Note: If a pump has been used for a liquid which is injurious to
health or toxic, the pump will be classified as contaminated.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are paid by the customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
pump has been used for liquids which are injurious to health or
toxic.
Remedy
Check that the low-pressure switch functions normally
and is adjusted correctly.
Check that the minimum inlet pressure is correct. If not,
check the feed pump.
Check the water level in the water tank.
Check and replace the main fuses and/or fuses for con-
trol circuit, if necessary.
Reset the starter overload, see also sections
8.2 Motor protection and 9. Start-up.
Replace the coil. Check the coil voltage.
ing devices (low-pressure switch, level switch, etc.).
Check motor and cable, see section 8. Electrical connec-
tion.
Check that the inlet pressure during operation is at least
0 bar, see section 7.1 Inlet pressure.
Restart the pump as described in section 9. Start-up.
Check the piping system and pump.
Clean the prefilter.
Replace the wear parts. Contact Grundfos Service.
See section 9. Start-up.
Dismantle, clean and check the pump.
Replace defective parts. Contact Grundfos Service.
Replace defective parts. Contact Grundfos Service.
Clean the prefilter.
Check the electricity supply.
Contact the electricity supply authorities, if necessary.
If a frequency converter is used, adjust the speed.
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