Grundfos ALPHA2 L Series Installation And Operating Instructions Manual
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Grundfos ALPHA2 L Series Installation And Operating Instructions Manual

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

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  • Page 1 GRUNDFOS GRUNDFOS INSTRUCTIONS ALPHA2 L www.grundfos.com/ALPHA2L...
  • Page 2 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).
  • Page 5 Contents: 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.
  • Page 6 Contents: Pumped liquids and operating conditions GRUNDFOS ALPHA2 L is suitable for • systems with 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.
  • Page 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...
  • Page 8 Contents: Mounting the GRUNDFOS ALPHA2 L Arrows on the pump housing indicate the liquid flow direction through the pump. 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.
  • Page 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).
  • Page 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...
  • Page 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 •...
  • Page 12 Contents: ALPHA2 L 25-40 180 POWER GRUNDFOS ALPHA2 L control panel The control panel on the GRUNDFOS ALPHA2 L comprises: "POWER ON" indicator light Seven light fields indicating the pump setting Push-button for selection of pump setting The "POWER ON" indicator light, see fig. 7, pos. 1, is on when the electricity has been switched on.
  • Page 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. POWER III II I Seven light fields Highest proportional-pressure curve...
  • Page 14 Contents: Selection of pump setting for system type Factory setting = Highest proportional-pressure curve (PP2). Recommended and alternative pump settings according to fig. 9: Lowest constant-pressure curve Highest constant-pressure curve Underfloor heating (CP1)* (CP2)* Highest proportional-pressure Lowest proportional-pressure Two-pipe systems curve (PP2)* curve (PP1)* Lowest proportional-pressure...
  • Page 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.
  • Page 16 Contents: 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 •...
  • Page 17 Follow this procedure: 1. Adjust the bypass valve with the pump in setting I (speed I). The minimum flow (Q ) for the system must always be observed. min. Consult the manufacturer's instructions. 2. When the bypass valve has been adjusted, set the pump to the lowest or highest constant-pressure curve.
  • Page 18 Contents: 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 Venting the pump The pump is self-venting. It need not be vented before start-up. Air in the pump may cause noise.
  • Page 19 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.
  • Page 20 Contents: Figure shows the relation between pump setting and pump performance by means of curves. See also POWER AUTO Pump setting in relation to pump performance The duty point of the pump will move up or down on the lowest Lowest proportional-pressure curve, see fig.
  • Page 21 ALPHA2 L runs at a constant speed and consequently on a constant curve. Speed II In speed II, the pump is set to run on the medium curve under all operating conditions. See fig. 13. ALPHA2 L runs at a constant speed and consequently on a constant curve.
  • Page 22 1. The pump Light off. a) One fuse in the Replace the fuse. does not run. installation is blown. b) The current-operated or Cut in the circuit breaker. voltage-operated circuit breaker has tripped out. c) The pump is defective. Replace the pump. "POWER a) Electricity supply failure.
  • Page 23 Contents: Supply voltage 1 x 230 V – 10 %/+ 6 %, 50 Hz, PE Motor protection The pump requires no external motor protection. Enclosure class IP 42 Insulation class Relative air humidity Maximum 95 % System pressure Maximum 1.0 MPa, 10 bar, 102 m head Inlet pressure ≤...
  • Page 24 Dimensional sketches, ALPHA2 L XX-40, XX-50, XX-60 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 *) For the UK market only. **) For UK 1 1/2.
  • Page 25 Contents:...
  • Page 26 Each pump setting has its own performance curve (Q/H curve). A power curve (P1 curve) belongs to each Q/H curve. The power curve shows the pump power consumption (P1) in Watt at a given Q/H curve. The P1 value corresponds to the value that can be read from the pump display, see fig.
  • Page 27 The guidelines below apply to the curves on the next pages: • Test liquid: Airless water. • The curves apply to a density of ρ = 983.2 kg/m and a liquid temperature of +60 °C. • All curves show average values and should not be used as guarantee curves.
  • Page 28 [kP a] Q [m³/h] Q [l/s] [W ] Q [m³/h] Performance curves, ALPHA2 L XX-40...
  • Page 29 Performance curves, ALPHA2 L XX-50...
  • Page 30 Performance curves, ALPHA2 L XX-60...
  • Page 31 0.05 PC 0833 TF110 Max. 0.19 IP 42 230V ~ 50Hz MADE IN DENMARK Nameplate, GRUNDFOS ALPHA2 L Rated current [A]: Pump type • Min.: Minimum current [A] • Max.: Maximum current [A] Input power P [W]: Product number • Min.: Minimum input power P •...
  • Page 32 Pump type Nominal diameter (DN) of suction and discharge ports [mm] Maximum head [dm] Port-to-port length [mm]...
  • Page 33 Accessories Accessories for GRUNDFOS ALPHA2 L. See fig. 20. Accessories include • fittings (unions and valves) • insulation kits (insulation shells) • plug.
  • Page 34 This product or parts of it must be disposed of in an environmentally sound way: 1. Use the public or private waste collection service. 2. If this is not possible, contact the nearest Grundfos company or service workshop. Subject to alterations.
  • Page 35 A-5082 Grödig/Salzburg Telefax: +60-3-5569 2866 Telefax: +46(0)31-331 94 60 Tel.: +43-6246-883-0 GRUNDFOS GMBH Telefax: +43-6246-883-30 Schlüterstr. 33 Bombas GRUNDFOS de México S.A. de GRUNDFOS Pumpen AG 40699 Erkrath C.V. Bruggacherstrasse 10 N.V. GRUNDFOS Bellux S.A. Tel.: +49-(0) 211 929 69-0 Boulevard TLC No.
  • Page 36 Being responsible is our foundation Thinking ahead makes it possible Innovation is the essence 0908 www.grundfos.com...

This manual is also suitable for:

Alpha2 l 15-40 130Alpha2 l 15-50 130Alpha2 l 25-40 130Alpha2 l 25-40 180Alpha2 l 32-40 180Alpha2 l 15-60 130 ... Show all

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