Starting Up The Product; Venting The Pump; First Startup; Product Introduction - Grundfos ALPHA1 Instrucciones De Instalación Y Operación

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 needs not to 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 "Constant Pressure III" for a short
period. How fast the pump is vented depends on
the system size and design.
When you have vented the pump, that is when
the noise has ceased, set the pump according to
the recommendations. See section
the 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.
7.
• Factory setting: Constant Pressure III.

6. Product introduction

6.1 Product description

The ALPHA1 circulator 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 ALPHA1, it means:
• Easy installation and startup.
– The pump is easy to install.
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.
8.3 Setting
7. Identification and

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 ALPHA1 circulator 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.
9