Grundfos MQ 3-45 Service Instructions

28.04.2003
GB
13 / 24
4.8 Overview
Before starting the fault finding procedure, check the external installation conditions of the pump. For this
purpose, see the installation and operating instructions.
Note: It is important to read this section as well as 4.9
Fault finding and 4.10 Fault finding overview thor-
oughly.
The pictures below show the essential parts that control the MQ pump.
TM02 2365 4201
Pressure switch.
• P < 2 bar => open contact.
(Tolerance: 1.8 - 2.2 bar)
• P > 2 bar => closed contact.
(Tolerance: 1.8 - 2.2 bar)
TM02 2366 4201
Flow sensor.
It is important that the magnet part of the flow wheel is
pointing upwards against the sensor part. The sensor is
positioned in the part with the wire connections.
TM02 2367 4201/P1010031
Capacitor.
Note the wiring of the capacitor.
Blue wire from the control panel together with the red
wire from the motor. The white wire is solitary.
TM02 2368 4201
Motor (see 5. Wiring diagram).
TM02 2466 4301
Controller and connections.
Blue
Red
White
Electricity
supply
Flow sensor
Pressure switch

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