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ALPHA1 Glandless Circulation Pump

ALPHA1 Glandless Circulation Pump
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ALPHA1 Glandless Circulation Pump
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272.01€
Ex Tax: 272.01€
  • Stock: In Stock
  • Brand: Grundfos
  • Model: 93074176
  • Weight: 3.00кг
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Grundfos ALPHA1 GO – submersible circulation pump

Grundfos ALPHA1 GO is a high-efficiency, submersible circulator pump designed for heating and air conditioning systems in residential buildings. It offers proportional pressure, constant pressure and constant characteristic, each setting having three performance levels.

High efficiency permanent magnet motor and low power consumption.
Quiet operation Sound pressure level up to 25 dB(A) when properly installed.
Reliable start Dry running protection and robust start in the event of dirt and deposits.

Key benefits of ALPHA1 GO

  • Circulation pump with electronically commutated permanent magnet motor.
  • Suitable for heating systems and air conditioning installations.
  • Suitable for radiator systems and underfloor heating.
  • Suitable for systems with a domestic hot water boiler.
  • Suitable for mixed systems with radiators, underfloor heating and domestic hot water.
  • Proportional pressure, constant pressure and constant characteristic.
  • Three performance settings for each mode.
  • Dry running protection during normal operation.
  • Robust start with high starting torque when blocked by dirt or limescale.
  • Ceramic shaft and ceramic bearings with minimal wear.
  • Low noise level up to 25 dB(A).
  • Built-in installer plug for quick electrical connection without tools.
  • Compatible with Grundfos GO for checking and setting when replacing.
  • Advanced mode option for reproducing UPS pump characteristics.

Applications

  • Radiator heating systems.
  • Underfloor heating.
  • Domestic hot water boiler systems.
  • Mixed heating systems.
  • Air conditioning systems.
  • Replacement of built-in and stand-alone circulation pumps.

Suitable liquids

  • Clean, thin, non-aggressive and non-explosive liquids.
  • Water in heating systems meeting accepted quality standards.
  • Mixtures of water with antifreeze, e.g. glycol or ethanol, with a kinematic viscosity below 15 cSt.
The pump is not intended for liquids containing solids, fibers, mineral oils, fuels, flammable liquids or aggressive chemicals.

Installation guidelines

  • The pump is installed with a horizontal motor shaft with a deviation of up to 5°.
  • The arrows on the housing indicate the direction of flow.
  • When installing in the pipeline, use the seals supplied.
  • Before starting, the system must be filled with liquid.
  • The electrical connection is made via an installer plug.
  • No external motor protection is required.
  • The pump is intended for indoor installation only.

Select model ALPHA1 GO

Both models have a maximum head of 8 m and a port length of 180 mm. The main difference is in the nominal diameter and the threaded connection.

Model Nominal diameter Maximum pressure Port length Joining Product number
25-80 DN 25 8 m 180mm G 1 1/2 93074176
32-80 DN 32 8 m 180mm G2 93074174

25-80 (Model: 93074176)

Circulation pump with submerged rotor DN 25, maximum head 8 m and port length 180 mm. The model has a G 1 1/2 connection and is suitable for radiator, underfloor and mixed heating systems.

The ALPHA1 GO 25-80 offers three control modes with three performance settings each and is suitable for replacing an existing pump in DN 25 pipelines.

32-80 (Model: 93074174)

Circulation pump with submerged rotor DN 32, maximum head 8 m and port length 180 mm. The model has a G 2 connection and is designed for heating systems with larger pipe diameters.

ALPHA1 GO 32-80 provides quiet and energy-efficient circulation with proportional pressure, constant pressure and constant characteristic.

Select the model according to the diameter and thread of the existing pipe connections. The DN 25 model has a G 1 1/2 connection, and the DN 32 model has a G 2 connection.

Control modes

Proportional pressure

With proportional pressure, the pump automatically adjusts its performance to the heat demand. The pressure decreases at lower flow rates and increases at higher flow rates.

This mode is suitable for radiator systems with thermostatic radiator valves that change the flow rate according to the room temperature.

  • Setting I: Minimum curve.
  • Setting II: Average curve.
  • Setting III: Maximum curve.

Constant pressure

At constant pressure, the pump maintains a stable pressure difference regardless of heat demand and the number of open zones.

This mode is particularly suitable for underfloor heating and systems with a common collector supplying several heating zones.

  • Setting I: Low constant pressure.
  • Setting II: Medium constant pressure.
  • Setting III: High constant pressure.

Permanent characteristic

With a constant characteristic, the pump operates at a constant speed or power, regardless of the actual flow rate in the system.

This mode is suitable for systems with constant characteristics and radiators that require a constant flow rate.

  • Setting I: Minimum speed.
  • Setting II: Medium speed.
  • Setting III: Maximum speed.

Advanced mode

Advanced mode allows the pump to replicate the characteristics of an existing UPS pump. This makes it easier to replace when upgrading the heating system.

Dry-running protection

The dry-running protection function protects the pump in the event of a lack of water. If dry-running continues, the pump stops and a warning code is shown on the display. After the cause has been eliminated, the pump can be restarted by pressing the button.

The factory setting is proportional pressure, level II. The setting can be changed from the control panel according to the type of heating system.

ALPHA1 GO model comparison

Characteristics ALPHA1 GO 25-80 ALPHA1 GO 32-80
Product number 93074176 93074174
Nominal diameter DN 25 DN 32
Maximum pressure 8 m 8 m
Port length 180mm 180mm
Joining G 1 1/2 G2
Maximum flow rate Up to 3.9 m³/h Up to 3.9 m³/h
Maximum power consumption Up to 60W Up to 60W
Power supply 220–240V, 50/60Hz 220–240V, 50/60Hz
Maximum system pressure 10 bar 10 bar
Liquid temperature 2–110°C 2–110°C
Degree of protection IP44 IP44
Noise level Up to 25 dB(A) Up to 25 dB(A)
Energy index EEI 0.20 EEI 0.20

Which model to choose?

  • ALPHA1 GO 25-80: Choose this model for DN 25 pipes and G 1 1/2 threaded connection. It is suitable for domestic radiator, underfloor and mixed heating systems.
  • ALPHA1 GO 32-80: Choose this model for DN 32 pipes and G 2 threaded connection. It is suitable for systems with a larger diameter and higher possible flow rate.
Both models have the same maximum head of 8 m, port length of 180 mm, maximum flow rate and functions. The main difference is in the nominal diameter and threaded connection.

Main technical indicators

Indicator Value
Maximum flow rate 3.9 m³/h
Maximum pressure 8 m
Minimum power 4W
Maximum power 60W
Maximum ambient temperature 55 °C at optimal continuous operation
Maximum system pressure 10 bar
Maximum relative humidity 95%

The data is in accordance with the provided technical catalogue for Grundfos ALPHA1 GO. Please check the specific diameter, connection, port length, liquid temperature and operating conditions before ordering and installation.

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