Operation And Maintenance; Frost Protection; Fault Finding Chart; Disposal - Grundfos CHV Serie Instrucciones De Instalación Y Funcionamiento

5. Operation and maintenance

If the liquid temperature exceeds +68°C,
the pump must cool before any
maintenance work is carried out.
Care should be taken to ensure that
persons cannot come into contact with the
pump during operation, e.g. by installing
a guard.
Under normal operating conditions, the pump does
not require any maintenance.
If the pump has been used for pumping liquids that
may leave impurities in the pump, it should be
flushed through with clean water immediately after
use.

6. Fault finding chart

Before removing the terminal box cover and before any removal/dismantling of the pump, make sure
that the electricity supply has been switched off and that it cannot be accidentally switched on.
Fault
1. Pump does not start.
2. Pump runs but gives no
water.
3. Pump runs at reduced
capacity.
4. Pump stops during
operation.

7. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
10

5.1 Frost protection

Pumps which are not being used during periods of
frost should be drained to avoid damage.
Remove the priming and drain plugs P and V, fig. .
Do not replace the plugs until the pump is to be used
again.
Cause
a) Supply failure.
b) Control circuit has cut out or is defective.
c) Motor is defective.
d) Pump is blocked by impurities.
a) Pump is not filled with liquid.
b) Suction or discharge pipe is blocked by impurities.
c) Pump is blocked by impurities.
d) Suction lift is too great.
e) Leakage in suction pipe.
f) Foot or non-return valve is blocked.
g) Wrong direction of rotation (three-phase).
a) Wrong direction of rotation (three-phase).
b) Suction lift is too great.
c) Suction or discharge pipe is blocked.
d) Pump is blocked by impurities.
e) Foot or non-return valve is partly blocked.
a) Thermal overload switch in motor or external motor protection cuts out.
b) Control circuit has cut out.
Fig. 6
P
(Rp 3/8)
V
(Rp 3/8)
Subject to alterations.