Grundfos MQ 3-45 Service Instructions

28.04.2003
GB
8 / 24
3.3 Replacing the pressure tank
3.3.1 Removing the pressure tank
1. Remove the cover pos. 43.
2. Remove the pressure tank pos. 42 including the O-ring pos. 44. It can be loosened using the fingers.
3. If the union nut including O-ring pos. 44 is not removed with the pressure tank, remove it using a 42 mm
socket.
3.3.2 Fitting the pressure tank
1. If the pressure tank pos. 42 has been screwed out of the union nut, lubricate the threads of the pressure
tank with Loctite 5331 and screw the tank into the union nut.
2. Fit the O-ring pos. 44 and screw the pressure tank pos. 42 into the motor housing pos. 180 by hand.
3. Fit the cover pos. 43.

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