Grundfos ALPHA1 L Series User Manual

English (GB)
10
5.5 Accessories
5.5.1 Unions and valve kits
G-threads have a cylindrical form in accordance with the EN ISO
228-1 standard and are not sealing the thread. It requires a flat
gasket. You can only screw cylindrical male G-threads, into
female G-threads. The G-threads are standard thread on the
pump housing.
R-threads are tapered external threads in accordance with the
EN 10226-1 standard.
Rc- or Rp-threads are internal threads with either tapered or
cylindrical threads. You can screw conical male R-threads into
female Rc- or Rp-threads. See fig. 9.
Fig. 9 G-threads and R-threads
5.5.2 Insulating shells
The insulating shells, which are tailored to the individual pump
type, can be ordered as accessories. It is easy to fit the insulating
shells around the pump.
Product numbers, unions
ALPHAx Connection
3/4 1 1 1/4 1 1 1/4 3/4 1 1 1/4 ∅22 ∅28 ∅15 ∅18 ∅22 ∅28 ∅42
25-xx
G 1 1/2
529921 529922 529821 529925 529924
25-xx N 529971 529972 519805 519806 519807 519808 519809 529977 529978 529979
32-xx G 2 509921 509922
Rp
R
Rp
mm
mm
TM06 7632 3616
R
Rp
Rc
G
Pump type Product number
ALPHA1 L XX-XX (N) 99270706

Grundfos ALPHA1 L Series Specifications

General

Pump Type	Circulator
Series	ALPHA1 L
Max Head	6 m
Voltage	230 V
Frequency	50/60 Hz
Liquid Temperature Range	2°C to 110°C
Max Operating Pressure	10 bar
Insulation Class	F
Enclosure Class	IP42
Application	Heating systems
Control Modes	Proportional pressure, constant pressure
EEI	0.20
Material	Cast iron
Power Input	Varies by model (e.g., ALPHA1 L 25-40 180: 3-22 W)
Pipe Connection	G 1 1/2