Grundfos MQ 3-25, Инструкция по установке и эксплуатации

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103
CONTENTS
Page
1. General description 103
1.1 Applications 103
1.2 Type key 103
1.3 MQ pump 104
2. Pumped liquids 104
3. Technical data 104
3.1 Operating conditions 104
3.2 Electrical data 105
3.3 Dimensions 105
3.4 Approvals 105
4. Functions 105
4.1 Control panel 105
4.2 Pump stop 107
5. Mounting and connection 107
5.1 Mounting the pump 107
5.2 Electrical connection 107
5.3 Generator or inverter 108
5.4 Start-up 108
6. Maintenance 108
6.1 Service kits 108
6.2 Start-up after a long time of inactivity 109
7. Service 109
8. Disposal 109
9. Fault finding chart 110
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The in-
stallation and operation should also be in
accordance with local regulations and ac-
cepted codes of good practice.
1. General description
The MQ is a compact water supply system consisting
of a pump, motor, pressure tank and controller com-
bined in an integral unit.
The pump starts automatically when water is con-
sumed in the installation and stops when the con-
sumption ceases. The MQ is a low-noise pump which
can be installed both indoors and outdoors.
The pump is self-priming and has a non-return valve
incorporated in the suction port, see fig. 1. The pump
features a user-friendly control panel.
The pressure tank incorporated in the pump reduces
the number of starts and stops in case of leakage in
the installation.
The MQ pump has built-in overtemperature and dry-
running protection.
1.1 Applications
Typical applications:
• Water pressure boosting in storage tanks
(maximum inlet pressure 3 bar) and
• water supply from wells (maximum suction lift
8 metres), e.g.
- in private homes,
- in summer houses and weekend cottages,
- on farms,
- in market gardens and other large gardens.
The pump can be used for rain water and has been
approved for drinking water.
The maximum suction lift of the pump can be deter-
mined from the diagram on page 120.
Example:
If the suction lift is 2.5 metres, the length of the suc-
tion pipe must not exceed 24 metres.
1.2 Type key
Example MQ 3 -35 A -O -A BVBP
Pump type
Nominal flow rate [m³/h]
Head [m]
Code for pump version
A: Standard
Code for pipework connection
Code for materials
A: Standard
Code for shaft seal