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LA 28AS

Air-to-water heat pump with two performance levels

LA 28AS
LA 28AS

Air-to-water heat pumps for outdoor installation with external temperature controlled WPM 2006 plus heat pump manager and two compressors for output reduction when operating at partial load. Sound-optimised through the use of low-noise crescent wing axial fans and deflector hoods. Energy-efficient defrosting by reverse circulation and diagonally positioned evaporator. Universal design with optional domestic hot water preparation and flexible expansion possibilities for:

  • Bivalent or bivalent-renewable operating mode
  • Distribution systems with unmixed and mixed heating circuits
Integrated flow sensor and soft starter; return sensor and outside temperature sensor included in the scope of supply.
The EVL ... electric cable for connecting the heat pump and the heat pump manager, must be ordered separately.

Information on leak tests and refrigerant quantities can be found here.

Technical data

Air-to-water heat pump with two performance levels (Low temperature)
Order reference LA 28AS
Heat pump code1001
Casing colourWhite aluminium (similar to RAL 9006)
Max. flow temperature58 °C
Lower operating limit heat source (heating operation) / Upper operating limit heat source (heating operation)-25 to 35 °C
Heat output with 1 compressor / COP A-7/W35*9,4 kW / 2,4
Heat output with 2 compressor / COP A-7/W35 (2 compressors)*17,4 kW / 2,7
Heat output 1 compressor / COP A2/W35*12,4 kW / 3
Heat output 2 compressors at A2/W35 / COP A2/W35 (2 compressors)*20,8 kW / 3,1
Heat output with 1 compressor / COP A7/W35*13,9 kW / 3,2
Heat output with 2 compressor / *25 kW / 3,4
Heat output with 1 compressor / COP A10/W35*14,3 kW / 3,2
Heat output with 2 compressor / COP A10/W35 (2 compressors)*28,2 kW / 3,6
Nominal power consumption according to EN 14511 at A2/W356,84 kW
Nominal power consumption according to EN 14511 at A7/W356,7 kW
Sound power level device68 dB (A)
Sound pressure level in 10 m41 dB (A)
Refrigerant / Amount of refrigerantR404A / 4,2 kg
Max. heating water flow rate / Pressure drop4,9 m³/h / 13600 Pa
Heat source flow (min.)8000 m³/h
Dimensions (W x H x D)**1680 x 1710 x 1000 mm
Weight355 kg
Connection voltage3/N/PE ~400 V, 50 Hz
Starting current with soft starter25 A
Fuse protectionC 25 A
Type of defrostingReverse circulation
Connection heating1 ¼ inch

*Heat output and COP according to EN 14511 at A2/W35 (A2 = air intake temp. +2 °C, W35 = heating water outlet temp. +35 °C)

**Please note that additional space is required for pipe connections, operation and maintenance.

Documents and downloads

Data sheetProduct data sheet with system accessories» via e-mail
Instruction for useInstruction for use» via e-mail
Product informationProduct information» via e-mail
Operating limits diagramOperating limits diagram» via e-mail
Declaration of conformityDeclaration of conformity» via e-mail
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