Suitable for

HVAC: Heating
Plumbing: Hot Water Recirculation
Residential hot water recirculation

Featuring AUTOADAPT and constant-pressure control modes, the Grundfos ALPHA2 provides the lowest energy consumption and greatest flexibility in a high-efficiency ECM variable speed circulator designed for a wide variety of heating and hot water recirculation applications.

The Grundfos ALPHA2 is a high-efficiency, variable speed circulator fitted with electronically commutated motor. Designed for circulating liquids in heating systems.

It features a constant pressure control mode and a constant curve with each three settings. The factory default setting is AUTOADAPT which continuously adjusts the pump performance to the actual heat demand, i.e. the size of the system and the changing heat demand during the year. The function will find the setting that provides optimal comfort with minimal energy consumption. It contributes to fast, safe and easy commissioning.

The intuitive one-button operation and LED display makes the selection of the settings easy. The large LED display shows the current energy consumption in Watts and estimated flow in gallons per minute.

ALPHA2 materials and design are resistant to blockage from magnetite found in hydronic systems.

The robust startup enables ALPHA2 to continuously attempt to restart – indefinitely – in blocked rotor conditions.

ALPHA2 is complete with an integrated check-valve, and nut captures for flanges.

For power connection two options are available with either line cord or terminal box for conduit connections.

performance-curve

Product name	ALPHA2 15-55F/LC
Product No.	99163906
EAN	5712607918354

Technical

Head max	18.05 ft
TF class	110
Approvals on nameplate	ETL, FCC

Materials

Pump housing	Cast iron
	EN 1561 EN-GJL-150
Impeller	Composite

Installation

Range of ambient temperature	32 .. 104 °F
Maximum operating pressure	145.04 psi
Type of connection	GF
Pipe connection	1 1/2
Pressure stage	PN 10
Port-to-port length	6 1/2 in

Liquid

Pumped liquid	Water
Liquid temperature range	35.6 .. 230 °F
Selected liquid temperature	140 °F
Density	61.35 lb/ft³

Electrical data

Power input - P1	5 .. 45 W
Main frequency	60 Hz
Rated voltage	1 x 115 V
Maximum current consumption	0.1 .. 0.65 A
Enclosure class (IEC 34-5)	IP42
Insulation class (IEC 85)	F
Built-in motor protection	NONE
Thermal protec	ELEC

Controls

Pos term box

6H

Others

Net weight	6.91 lb
Gross weight	7.53 lb
Shipping volume	0.28 ft³
Sales region	USA

Grundfos 99163906 ALPHA2 15-55F/LC Circulator Pump w/ Line Chord 115V Cast Iron

Shipping

Specifications