Grundfos MQ 3-45 Service Instructions

28.04.2003
GB
15 / 24
4.10 Fault finding overview
Start the pump and allow it to run for a minimum of 5 minutes with the tap turned on. Then observe how the
system reacts.
Typical faults
If the tap is opened
too quickly, there
will be no alarm
indication.
If the flow is lower
than 1.2 l/min., the
pump does not
start and there will
be no alarm indica-
tion.
See 4.10.1
Observation
A on page 16.
Water comes out of
the tap, but the
pump stops every
15 seconds for a
short period and
starts again right
away. The alarm
indicator light is off.
See 4.10.2
Observation
B on page 18.
No water comes
out of the tap. The
alarm indicator
light is on.
See 4.10.3
Observation
C on page 20.
No water comes
out of the tap. The
alarm indicator
light is off.
See 4.10.4
Observation
D on page 23.
Pressure
switch
Controller
15 sec.
Pressure
switch
Flow sensor Controller
Controller
Capacitor
Motor Hydraulics
Controller

Grundfos MQ 3-45 Specifications

General

Power consumption	1000 W
Maximum head	45 m
Maximum flow rate	3 m³/h
Protection class	IP54
Weight	13 kg
Maximum liquid temperature	35 °C
Maximum operating pressure	7.5 bar
Pumped liquid	Clean water
Liquid temperature range	0 - 35 °C
Maximum ambient temperature	45 °C
Supply voltage	220-240 V
Rated power - P2	0.75 kW
Mains frequency	50/60 Hz
Rated current	4.5 A
Enclosure class	IP54
Inlet connection	1 inch
Outlet connection	1 inch
Power supply	220-240 V, 50/60 Hz
Pump type	Centrifugal
Built-in pressure tank	Yes
Approvals	CE
Material	Stainless steel