Grundfos alpha2 l User manual

GRUNDFOS
ALPHA2 L
GRUNDFOS INSTRUCTIONS
www.grundfos.com/ALPHA2L

We
       
declare under our sole responsibility that the products
              
, to which this declaration relates, are in conformity
with the Council Directives on the approximation of the laws of the EC
Member States relating to
— Machinery (98/37/EC).
— Electrical equipment designed for use within certain voltage limits
(2006/95/EC).
Standards used: EN 60335-1: 2002 and EN 60335-2-51: 2003.
— Electromagnetic compatibility (2004/108/EC).
Standards used: EN 61000-6-2 and EN 61000-6-3.
Bjerringbro, 15th May 2008
Svend Aage Kaae
Technical Director
2

3
   
                                                                !
              "                                                     #
$   " "                                                               %
!  &   '
#  (                                                                
%  )       "                                                           
*           "   "                                                    !
'         +      "    ,   ,     +       +          "  "                    %
- ."  '
 /     "            "   " "                                            /
                                                                     
   0                                                                  $
 $              ,                                                    #
!     $
#      $$
%   "   $!

4
1 2 3 4 5 4 6
7 3 5 8 3 9 8 5 4 : 9 2 ; ; 2 9 5 8 4 < 3 = 2 > 9 ? = : = 5 4 : 9 2 ; ; 2 9 5 8 4 2 4 > 8 @ = 3 2 9 5 4 6
5 4 : 9 3 A B 9 5 8 4 : C D 4 : 9 2 ; ; 2 9 5 8 4 2 4 > 8 @ = 3 2 9 5 8 4 E A : 9 B 8 E @ ; F G 5 9 ? ; 8 B 2 ;
3 = 6 A ; 2 9 5 8 4 : 2 4 > 2 B B = @ 9 = > B 8 > = : 8 H 6 8 8 > @ 3 2 B 9 5 B = C
1 2 3 4 5 4 6
D H 9 ? = : = : 2 H = 9 F 5 4 : 9 3 A B 9 5 8 4 : 2 3 = 4 8 9 8 I : = 3 J = > < 5 9 E 2 F 3 = : A ; 9 5 4
@ = 3 : 8 4 2 ; 5 4 K A 3 F L
M N O P Q R S
D H 9 ? = : = : 2 H = 9 F 5 4 : 9 3 A B 9 5 8 4 : 2 3 = 4 8 9 8 I : = 3 J = > < 5 9 E 2 F 3 = : A ; 9 5 4
E 2 ; H A 4 B 9 5 8 4 8 3 > 2 E 2 6 = 9 8 9 ? = = T A 5 @ E = 4 9 L
U R P V W
8 9 = : 8 3 5 4 : 9 3 A B 9 5 8 4 : 9 ? 2 9 E 2 X = 9 ? = K 8 I = 2 : 5 = 3 2 4 > = 4 : A 3 = : 2 H =
8 @ = 3 2 9 5 8 4 C

5
Contents:
Y Z [ \ ] ^ _ ` a b c d e f g h i j g Y h k l m k n o p q r m s n t s
Y Z Y g u v p w q p x ^ y r z l w y q p o o l w x p _ ` a b c d e f g h i j g Y h
.
The GRUNDFOS ALPHA2 L circulator pump is designed for the
circulation of water in heating systems.
Install the GRUNDFOS ALPHA2 L in
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
GRUNDFOS ALPHA2 L incorporates a permanent-magnet motor and
differential-pressure control enabling continuous adjustment of the pump
performance to the actual system requirements.
GRUNDFOS ALPHA2 L has a user-friendly front-mounted control panel.
See
{
Z | r w q m r o s p w ^ o
and
[ } Z d ^ p q n m ^ y
.
The installation of a GRUNDFOS ALPHA2 L means
                        .  "
• GRUNDFOS ALPHA2 L is easy to install.
With the factory setting, the pump can, in most cases, be started
without making any settings.
                 
• Minimum noise from valves, etc.
  +            "    
• Low energy consumption compared to conventional circulator pumps.
The GRUNDFOS ALPHA2 L is A-labelled.
    
Energy label, A-labelled
TM03 0868 0705

6
Contents:
~ Z [ f  y q ^ t q  s ^ y
~ Z Y i n t s ^ u o l  n l u y
~ Z ~ f  y q ^ t s m ^ y y n m ^
~ Z } ` ^ o p q l v ^ p l m ] n t l u l q   ` j 
~ Z   w k o r y n m ^ k o p y y
~ Z
{ 
w o ^ q s m ^ y y n m ^
.
    
Pumped liquids and operating conditions
GRUNDFOS ALPHA2 L is suitable for
• systems with
      
or
,           + 
where it is desirable to
optimise the setting of the pump duty point
• systems with
,           + . "  "     "       
.
Clean, thin, non-aggressive and non-explosive liquids, not containing
solid particles, fibres or mineral oil. See fig. 2.
In
             
, the water should meet the requirements of accepted
standards on water quality in heating systems, e.g. the German standard
VDI 2035.
TM04 2521 2608
1 2 3 4 5 4 6
 ? = @ A E @ E A : 9 4 8 9 I = A : = > H 8 3 9 ? = 9 3 2 4 : H = 3 8 H H ; 2 E E 2 I ; = ; 5 T A 5 > :
: A B ? 2 : > 5 = : = ; 8 5 ; < @ = 9 3 8 ; 2 4 > : 5 E 5 ; 2 3 ; 5 T A 5 > : C

7
Maximum 1.0 MPa (10 bar). See fig. 2.
Maximum 95 %. See fig. 2.
IP 42. See fig. 2.
Minimum inlet pressure in relation to liquid temperature. See fig. 2.
         "        
           "       


      
≤75 °C 0.005 0.05
90 °C 0.028 0.28
110 °C 0.108 1.08

8
Contents:
} Z [  r n w q l w x
} Z Y | r w q m r o  r  s r y l q l r w y
} Z ~ | ] p w x l w x q ] ^ k r w q m r o  r  s r y l q l r w
} Z }

w y n o p q l r w r z s n t s ] r n y l w x
.
    $
Mounting the GRUNDFOS ALPHA2 L
Arrows on the pump housing indicate the liquid flow direction through the
pump.
See
[ Y Z Y

w y q p o o p q l r w u l t ^ w y l r w y  _ ` a b c d e f g h i j g Y h    }        

{

.
1. Fit the two gaskets supplied when the pump is mounted in the pipe.
See fig. 3, pos. A.
2. Install the pump with the motor shaft horizontal. See fig. 3, pos. B.
TM04 2522 2608

9
    !
Control box positions
The control box can be rotated in steps of 90 °.
Possible/permissible positions and the procedure of changing the position
of the control box are illustrated in fig. 4, pos. A.
Procedure:
1. Slacken and remove the four hexagon-socket head screws holding the
pump head with a tee key (M4).
2. Turn the pump head to the desired position.
3. Insert and cross-tighten the screws.
TM04 2523 2608
A
1 2 3 4 5 4 6
 ? = @ A E @ = > ; 5 T A 5 > E 2 F I = : B 2 ; > 5 4 6 ? 8 9 2 4 > A 4 > = 3 ? 5 6 ? @ 3 = : : A 3 = L
 3 2 5 4 9 ? = : F : 9 = E 8 3 B ; 8 : = 9 ? = 5 : 8 ; 2 9 5 4 6 J 2 ; J = : 8 4 = 5 9 ? = 3 : 5 > = 8 H 9 ? =
@ A E @ I = H 8 3 = 9 ? = : B 3 = G : 2 3 = 3 = E 8 J = > C
M N O P Q R S
1 ? = 4 9 ? = @ 8 : 5 9 5 8 4 8 H 9 ? = B 8 4 9 3 8 ; I 8  ? 2 : I = = 4 B ? 2 4 6 = > < H 5 ; ; 9 ? =
: F : 9 = E G 5 9 ? 9 ? = ; 5 T A 5 > 9 8 I = @ A E @ = > 8 3 8 @ = 4 9 ? = 5 : 8 ; 2 9 5 4 6 J 2 ; J = : C

10
    #
Insulation of pump housing
The heat loss from the pump and pipework can be reduced by insulating
the pump housing and the pipe. See fig. 5.
As an alternative, polystyrene insulation shells can be ordered from
Grundfos. See
[  Z g k k ^ y y r m l ^ y
.
TM04 2524 2608
U R P V 
5 E 5 9 9 ? = ? = 2 9 ; 8 : : H 3 8 E 9 ? = @ A E @ ? 8 A : 5 4 6 2 4 > @ 5 @ = G 8 3 X C
M N O P Q R S
 8 4 8 9 5 4 : A ; 2 9 = 9 ? = B 8 4 9 3 8 ; I 8  8 3 B 8 J = 3 9 ? = B 8 4 9 3 8 ; @ 2 4 = ; C

11
    %
Electrical connection
The electrical connections and protection must be carried out in
accordance with local regulations.
• The motor requires no external motor protection.
• Check that the supply voltage and frequency correspond to the values
stated on the pump. See
[ } Z [ b p t ^ s o p q ^
.
• Connect the pump to the mains with the plug supplied with the pump
as shown in fig. 6, steps 1 to 8.
• Light in the control panel shows that the electricity supply has been
switched on.
TM04 2525 2608
1 2 3 4 5 4 6
 ? = @ A E @ E A : 9 I = B 8 4 4 = B 9 = > 9 8 = 2 3 9 ? C
 ? = @ A E @ E A : 9 I = B 8 4 4 = B 9 = > 9 8 2 4 =  9 = 3 4 2 ; E 2 5 4 : : G 5 9 B ? G 5 9 ? 2
E 5 4 5 E A E B 8 4 9 2 B 9 6 2 @ 8 H  E E 5 4 2 ; ; @ 8 ; = : C

12
Contents:
{
Z [  o ^ t ^ w q y r w q ] ^ k r w q m r o s p w ^ o
{
Z Y  i e   ` e b  l w u l k p q r m o l x ] q
{
Z ~ h l x ] q z l ^ o u y l w u l k p q l w x q ] ^ s n t s y ^ q q l w x
{
Z } i n y ]   n q q r w z r m y ^ o ^ k q l r w r z s n t s y ^ q q l w x
.
    *
GRUNDFOS ALPHA2 L control panel
The control panel on the GRUNDFOS ALPHA2 L comprises:
The "POWER ON" indicator light, see fig. 7, pos. 1, is on when the
electricity has been switched on.
When the "POWER ON" indicator light is on only, a fault preventing the
pump from operating properly (e.g. seizing-up) has occurred.
If a fault is indicated, correct the fault and reset the pump by switching the
electricity supply off and on.
TM04 2526 2608
         "    
1 "POWER ON" indicator light
2 Seven light fields indicating the pump setting
3 Push-button for selection of pump setting
1
2
3
A
ON
POWER
ALPHA2 L 25-40 180

13
GRUNDFOS ALPHA2 L has seven optional settings which can be
selected with the push-button. See fig. 7, pos. 3.
The pump setting is indicated by seven different light fields. See fig. 8.
    '
Seven light fields
See
[  Z i n t s y ^ q q l w x y p w u s n t s s ^ m z r m t p w k ^
for information about the
function of the settings.
Every time the push-button is pressed, see fig. 7, pos. 3, the pump setting
is changed.
A cycle is seven button presses. See
{
Z ~ h l x ] q z l ^ o u y l w u l k p q l w x q ] ^ s n t s
y ^ q q l w x
.
TM04 2527 2608
    
"      
               "    
0PP2
(factory setting) Highest proportional-pressure curve
1CP1 Lowest constant-pressure curve
2CP2 Highest constant-pressure curve
3 III Constant curve, speed III
4 II Constant curve, speed II
5 I Constant curve, speed I
6PP1 Lowest proportional-pressure curve
7PP2 Highest proportional-pressure curve
III II I PP1
PP2 CP2
CP1
ON
POWER

14
Contents:
Z [ i n t s y ^ q q l w x z r m y  y q ^ t q  s ^
Z Y i n t s k r w q m r o
.
    -
Selection of pump setting for system type
Factory setting = Highest proportional-pressure curve (PP2).
Recommended and alternative pump settings according to fig. 9:
)                                 ,  "   "       
Heating systems are "slow" systems that cannot be set to the optimum
operation within minutes or hours.
If the recommended pump setting does not give the desired distribution of
heat in the rooms of the house, change the pump setting to the shown
alternative.
Explanation to pump settings in relation to performance curves,
see
[  Z i n t s y ^ q q l w x y p w u s n t s s ^ m z r m t p w k ^
.
TM04 2528 2608
            " 
   "       
                   , 
A Underfloor heating Lowest constant-pressure curve
(CP1)*
Highest constant-pressure curve
(CP2)*
B Two-pipe systems Highest proportional-pressure
curve (PP2)*
Lowest proportional-pressure
curve (PP1)*
C One-pipe systems Lowest proportional-pressure
curve (PP1)*
Highest proportional-pressure
curve (PP2)*
* See
[ ~ Z [ _ n l u ^ q r s ^ m z r m t p w k ^ k n m v ^ y
.

15
During operation, the pump head will be controlled according to the
principle "proportional-pressure control" (PP) or "constant-pressure
control" (CP).
In these control modes, the pump performance and consequently the
power consumption are adjusted according to the heat demand in the
system.
   "         . "             
In this control mode, the differential pressure across the pump is
controlled according to the flow.
The proportional-pressure curves are indicated by PP1 and PP2 in the
Q/H diagrams. See
[  Z i n t s y ^ q q l w x y p w u s n t s s ^ m z r m t p w k ^
.
)        . "             
In this control mode, a constant differential pressure across the pump is
maintained, irrespective of the flow.
The constant-pressure curves are indicated by CP1 and CP2 and are
the horizontal performance curves in the Q/H diagrams. See
[  Z i n t s
y ^ q q l w x y p w u s n t s s ^ m z r m t p w k ^
.

16
Contents:
 Z [ i n m s r y ^ r z   s p y y v p o v ^
 Z Y  p w n p o o  r s ^ m p q ^ u   s p y y v p o v ^
 Z ~ g n q r t p q l k   s p y y v p o v ^  q ] ^ m t r y q p q l k p o o  k r w q m r o o ^ u 
.
     /
Systems with bypass valve
 "    ,   , 
The purpose of the bypass valve is to ensure that the heat from the boiler
can be distributed when all valves in the underfloor-heating circuits and/or
thermostatic radiator valves are closed.
System elements:
• bypass valve
• flowmeter, pos. A.
The minimum flow must be present when all valves are closed.
The pump setting depends on the type of bypass valve used, i.e. manually
operated or thermostatically controlled.
Follow this procedure:
1. Adjust the bypass valve with the pump in setting I (speed I).
The minimum flow (Qmin.) for the system must always be observed.
Consult the manufacturer's instructions.
2. When the bypass valve has been adjusted, set the pump according to
Z f ^ q q l w x q ] ^ s n t s
.
TM04 2529 2608
A

17
Follow this procedure:
1. Adjust the bypass valve with the pump in setting I (speed I).
The minimum flow (Qmin.) for the system must always be observed.
Consult the manufacturer's instructions.
2. When the bypass valve has been adjusted, set the pump to the lowest
or highest constant-pressure curve.
Explanation to pump settings in relation to performance curves, see
[  Z i n t s y ^ q q l w x y p w u s n t s s ^ m z r m t p w k ^
.

18
Contents:
 Z [  ^ z r m ^ y q p m q  n s
 Z Y  ^ w q l w x q ] ^ s n t s
 Z ~  ^ w q l w x r z ] ^ p q l w x y  y q ^ t y
.
Do not start the pump until the system has been filled with liquid and
vented. The required minimum inlet pressure must be available at the
pump inlet. See
~ Z g s s o l k p q l r w y
and
[ Y Z \ ^ k ] w l k p o u p q p p w u l w y q p o o p q l r w
u l t ^ w y l r w y
.
     
Venting the pump
The pump is self-venting. It need not be vented before start-up.
Air in the pump may cause noise. This noise ceases after a few minutes
running.
Quick venting of the pump can be obtained by setting the pump to speed
III for a short period, depending on system size and design.
When the pump has been vented, i.e. when the noise has ceased, set the
pump according to the recommendations. See
Z f ^ q q l w x q ] ^ s n t s
.
The system cannot be vented through the pump. See
 Z ~  ^ w q l w x r z
] ^ p q l w x y  y q ^ t y
.
TM04 2530 2608
M N O P Q R S
 ? = @ A E @ E A : 9 4 8 9 3 A 4 > 3 F C

19
     
Venting of heating systems
The heating system can be vented via an air escape valve installed above
the pump (1).
In heating systems that often contain much air, Grundfos recommends the
installation of pumps with pump housing with air separator, i.e. ALPHA2
pumps, type ALPHA2 XX-XX A.
When the heating system has been filled with liquid, follow this procedure:
1. Open the air escape valve.
2. Set the pump to speed III.
3. Let the pump run for a short period, depending on system size and
design.
4. When the system has been vented, i.e. when the possible noise has
ceased, set the pump according to the recommendations. See
Z f ^ q q l w x q ] ^ s n t s
.
Repeat the procedure, if necessary.
TM04 2531 2608
M N O P Q R S
 ? = @ A E @ E A : 9 4 8 9 3 A 4 > 3 F C

20
Contents:
[  Z [ ` ^ o p q l r w  ^ q  ^ ^ w s n t s y ^ q q l w x p w u s n t s s ^ m z r m t p w k ^
.
Figure 13 shows the relation between pump setting and pump
performance by means of curves. See also
[ ~ Z i ^ m z r m t p w k ^ k n m v ^ y
.
     $
Pump setting in relation to pump performance
TM04 2532 2608
III
II
I
AUTO
PP1 PP2CP1
CP2
H
Q
ON
POWER
          "   ,        
PP1
Lowest
proportional-
pressure curve
The duty point of the pump will move up or down on the lowest
proportional-pressure curve, see fig. 13, depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
PP2
(factory
setting)
Highest
proportional-
pressure curve
The duty point of the pump will move up or down on the highest
proportional-pressure curve, see fig. 13, depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
CP1
Lowest
constant-
pressure curve
The duty point of the pump will move out or in on the lowest
constant-pressure curve, see fig. 13, depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
CP2
Highest
constant-
pressure curve
The duty point of the pump will move out or in on the highest
constant-pressure curve, see fig. 13, depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
III Speed III
ALPHA2 L runs at a constant speed and consequently on a
constant curve.
In speed III, the pump is set to run on the max. curve under all
operating conditions. See fig. 13.
Quick venting of the pump can be obtained by setting the pump to
speed III for a short period. See
 Z Y  ^ w q l w x q ] ^ s n t s
.