Grundfos MQ 3-45 Service Instructions

28.04.2003
GB
17 / 24
A6
TM02 2374 4201
At a pressure above 2.5 bar, the switch is closed, and the
multimeter must show approx. 0 Ω.
If the multimeter shows “OL” or M Ω, the contact is open,
and the pressure switch must be replaced.
A7
TM02 2375 4201/TM02 2376 4201
Turn on the tap. The pressure is removed from the system.
A8
TM02 2377 4201
At a pressure below 2 bar, the switch is open, and the mul-
timeter must show “OL” or M Ω.
If the multimeter shows approx. 0 Ω, the contact is
closed, and the pressure switch must be replaced.
If the pressure switch is OK, replace the controller.
P > 2.5 bar
0 Ω
OK
Ω
Replace
8

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