Product Introduction; Product Description; Intended Use; Pumped Liquids - Grundfos ALPHA2 Series Installation And Operating Instructions Manual

5. Product introduction

5.1 Product description

The pump is designed for circulating liquids in systems with
variable flow rates where it is desirable to optimise the setting of
the pump duty point to reduce energy costs.
The table below shows the ALPHA2 models with built-in functions
and features.
Comparison of ALPHA2 models according to built-in functions and features
Functions/features
Starts from
AUTO
ADAPT
Proportional pressure
Constant pressure
Constant curve
Automatic night setback
Manual summer mode
Dry-running protection
ALPHA Reader compatible
High-torque start
ALPHA2XX-40
ALPHA2XX-50
ALPHA2XX-60
ALPHA2XX-80
* Production code (Year-Week).

5.2 Intended use

The pump is designed for circulating liquids in heating and
air-conditioning systems with temperatures equal to or higher
than 2 °C. You can also use pumps with stainless-steel pump
housing in domestic hot-water systems.

5.3 Pumped liquids

The pump is suitable for the following liquids:
• clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles or fibres
• cooling liquids, not containing mineral oil
• softened water.
The kinematic viscosity of water is 1 mm
pump is used for a liquid with a higher viscosity, the hydraulic
performance of the pump will be reduced.
Example: 50 % glycol at 20 °C means a viscosity of approx. 10
2
mm /s (10 cSt) and a reduction of the pump performance by
approx. 15 %.
Do not use additives that can or will disturb the functionality of the
pump.
When selecting a pump, take the viscosity of the pumped liquid
into consideration.
For more information about the pumped liquids, warnings and
operating conditions, see section
models according to built-in functions and
8
ALPHA2 model B
PC 12xx*
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2
/s (1 cSt) at 20 °C. If the
Comparison of ALPHA2
features.
ALPHA2 model C ALPHA2 model D
PC 14xx* PC 15xx*
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ALPHA2 model E
PC 17xx*
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