Grundfos alpha2 l User Manual

English (GB)
3
English (GB) Installation and operating instructions
Original installation and operating instructions.
CONTENTS
Page
1. Symbols used in this document
1. Symbols used in this document
3
2. General description
4
2.1 Advantages of installing a GRUNDFOS ALPHA2 L
4
3. Identification
5
3.1 Nameplate
5
3.2 Type key
5
4. Applications
6
4.1 System types
6
4.2 Pumped liquids
6
4.3 System pressure
6
4.4 Relative air humidity (RH)
6
4.5 Enclosure class
6
4.6 Inlet pressure
6
5. Mechanical installation
7
5.1 Mounting
7
5.2 Control box positions
8
5.3 Changing the control box position
8
5.4 Insulation of pump housing
9
6. Electrical installation
10
7. Control panel
11
7.1 Elements on the control panel
11
7.2 "POWER ON" light field
11
7.3 Light fields indicating the pump setting
11
7.4 Push-button for selection of pump setting
11
8. Setting the pump
12
8.1 Pump setting for system type
12
8.2 Pump control
12
9. Systems with bypass valve between flow and return
pipes
13
9.1 Purpose of bypass valve
13
9.2 Manually operated bypass valve
13
9.3 Automatic bypass valve (thermostatically controlled)
13
10. Startup
14
10.1 Before start-up
14
10.2 Venting the pump
14
10.3 Venting of heating systems
14
11. Pump settings and pump performance
15
11.1 Relation between pump setting and pump performance
15
12. Fault finding
16
13. Technical data and installation dimensions
17
13.1 Technical data
17
13.2 Installation dimensions, GRUNDFOS ALPHA2 L XX-
40, XX-50, XX-60
18
14. Performance curves
19
14.1 Guide to performance curves
19
14.2 Curve conditions
19
14.3 Performance curves, ALPHA2 L XX-40
20
14.4 Performance curves, ALPHA2 L XX-50
21
14.5 Performance curves, ALPHA2 L XX-60
22
15. Accessories
23
16. Disposal
23
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
The use of this product requires experience with
and knowledge of the product.
Persons with reduced physical, sensory or
mental capabilities must not use this product,
unless they are under supervision or have been
instructed in the use of the product by a person
responsible for their safety.
Children must not use or play with this product.
Warning
If these safety instructions are not observed,
it may result in personal injury.
Warning
If these instructions are not observed, it may lead
to electric shock with consequent risk of serious
personal injury or death.
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Note
Notes or instructions that make the job easier
and ensure safe operation.

Grundfos alpha2 l Specifications

General

Pump Type	Circulator Pump
Series	ALPHA2 L
Max Head	6 m
Voltage	230 V
Frequency	50/60 Hz
Temperature Range	2°C to 110°C
Material	Cast iron
Max Operating Pressure	10 bar
Installation Length	180 mm
Enclosure Class	IP42
Insulation Class	F
Weight	2.1 kg
Protection Class	Class I