11
10.1 Exploded views of pumps
When ordering spare parts, see pages 174 and 175.
11. 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 Grund-
fos company or service workshop.
4.
Frequent starts
and stops.
a) The differential of the pressure
switch between the start and stop
pressures is too small.
Increase the differential. However, the stop
pressure must not exceed the operating
pressure of the pressure tank and the start
pressure should be high enough to ensure
sufficient water supply.
b) The float switch has not been ad-
justed correctly.
Adjust the float switch to ensure suitable
time between the cutting-in and cutting-out
of the pump, see section
.
c) The non-return valve is leaking or
stuck half-open.
Clean or replace the non-return valve.
d) The supply voltage is unstable.
Check the electricity supply.
e) The motor temperature is too high.
Check the water temperature.
f) The pump is blocked.
Clean the pump and check that the rotating
parts of the pump can rotate freely.
g) The precharge pressure of the
pressure tank is too low.
Adjust the tank precharge pressure in ac-
cordance with the installation and operating
instructions supplied with the tank.
h) The pressure tank is too small.
Increase the capacity of the pressure tank
by replacing the tank or supplementing with
an additional tank.
i) The diaphragm of the tank is de-
fective.
Check and replace the pressure tank, if
necessary.
Fault
Cause
Remedy
Subject to alterations.
