Starting Up The Product; Venting The Pump; First Startup; Product Introduction - Grundfos ALPHA2 Instructions D'installation Et D'utilisation

5. Starting up the product

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.

5.1 Venting the pump

The pump is self-venting. It need not be vented
before startup.
The pump must not run dry.
Air in the pump may cause noise. This noise
ceases after a few minutes running.
You obtain quick venting of the pump by setting
the pump to speed III for a short period. How
fast the pump is vented depends on the system
size and design.
When you have vented the pump, i.e. when the
noise has ceased, set the pump according to the
recommendations. See section
pump.
You cannot vent the system through the pump.

5.2 First startup

• The light in the control panel shows that the
power supply has been switched on. See
fig. 9.
• Factory setting: AUTO
8.3 Setting the
.
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6. Product introduction

6.1 Product description

The ALPHA2 circulator pump incorporates a
permanent-magnet motor and differential-
pressure control enabling continuous
adjustment of the pump performance to the
actual system requirements.
The pump has a user-friendly front-mounted
control panel. See sections
8. Control functions.
When you install an ALPHA2, it means:
• Easy installation and start-up.
– The pump is easy to install.
Thanks to the AUTO
(factory setting), you can start the pump, in
most cases, without making any settings.
• High degree of comfort.
• Minimum noise from valves, etc.
• Low energy consumption.
– Low energy consumption compared to
conventional circulator pumps.

6.2 Applications

DANGER
Explosion hazard
Death or serious personal injury.
- Do not use the pump for transfer of
flammable liquids such as diesel
oil, gasoline, and similar liquids.
DANGER
Electric shock
Death or serious personal injury.
- This pump has not been
investigated for use in swimming
pool or marine areas.
The ALPHA2 circulator pump is designed for the
circulation of water in heating systems, domestic
hot-water systems as well as air-conditioning
and cold-water systems.
Cold-water systems are defined as systems
where the ambient temperature is higher than
the temperature of the pumped liquid.
The pump is the best choice for the following
systems:
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
The pump is suitable for the following:
• systems with constant or variable flows
where you want to optimize the setting of the
pump duty point.
• systems with variable flow-pipe temperature.
• balancing of domestic heating systems.
7. Identification and
function
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