Grundfos MQ 3-45 Service Instructions

Service instructions
MQ 3-35, MQ 3-45
50/60 Hz
1~
1 / 24
28.04.2003
GB
Contents
1. Type identification ..........................................................................................................................................................2
1.1 Nameplate.........................................................................................................................................................................2
1.2 Type key .............................................................................................................................................................................3
2. Service tools ..................................................................................................................................................................... 4
2.1 Special tools ..................................................................................................................................................................... 4
2.2 Standard tools ................................................................................................................................................................. 4
3. Dismantling and assembly............................................................................................................................................5
3.1 General information .......................................................................................................................................................5
3.2 Replacing the shaft seal, chambers and impellers................................................................................................. 6
3.3 Replacing the pressure tank ........................................................................................................................................ 8
3.4 Replacing the electronic unit, flow sensor and pressure switch ........................................................................ 9
3.5 Replacing the motor unit............................................................................................................................................ 10
4. Operation.........................................................................................................................................................................11
4.1 Priming .............................................................................................................................................................................11
4.2 Start...................................................................................................................................................................................11
4.3 Stop ...................................................................................................................................................................................11
4.4 Alarm ................................................................................................................................................................................11
4.5 Auto-reset........................................................................................................................................................................11
4.6 Manual reset...................................................................................................................................................................11
4.7 Control panel ..................................................................................................................................................................12
4.8 Overview..........................................................................................................................................................................13
4.9 Fault finding....................................................................................................................................................................14
4.10 Fault finding overview .................................................................................................................................................15
5. Wiring diagram ............................................................................................................................................................. 24
5.1 Winding resistence measurement........................................................................................................................... 24

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