Installation manual

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Air-to-Water Heat Pumps 2.8.2
2.8.2 Low-temperature heat pumps with 2 compressors LA 20AS to LA 28AS
Device information for air-to-water heat pumps for heating purposes
1 Type and order code
LA 20AS LA 24AS LA 28AS
2Design
2.1 Degree of protection according to EN 60 529 for compact devices and
heating components
IP24 IP24 IP24
2.2 Installation location Outdoors Outdoors Outdoors
3 Performance data
3.1 Operating temperature limits:
Heating water flow/return flow
1
°C / °C
1. See operating limits diagram
up to 55 / above 18 up to 55 / above 18 up to 55 / above 18
Air °C -25 to +35 -25 to +35 -25 to +35
3.2 Temperature spread of heating water (flow/return flow) at A2 / W35K 7.9 8.4 9.4
3.3 Heat output / COP at A-7 / W35
2
kW / ---
3
2. This data indicates the size and capacity of the system according to EN 255 or EN14511. For an analysis of the economic and energy efficiency of the system, other parameters,
particularly the defrosting capacity, the bivalence point and regulation, should also be taken into consideration. The specified values, e.g. A2 / W55, have the following meaning:
2 °C external air temperature and 55 °C heating water flow temperature.
3. Operation with 1 compressors
7.0 / 2.5 8.9 / 2.6 9.9 / 2.4
4
4. Operation with 2 compressors
12.4 / 2.7 16.1 / 2.7 19.1 / 2.7
at A2 / W35
2
kW / ---
3
9.3 / 3.1 10.9 / 3.0 12.8 / 3.0
4
14.9 / 3.0 19.2 / 3.2 22.3 / 3.0
at A2 / W50
2
kW / ---
3
8.5 / 2.4 9.9 / 2.3 10.8 / 2.0
4
14.2 / 2.3 18.0 / 2.4 21.1 / 2.3
at A7 / W35
2
kW / ---
3
9.8 / 3.2 13.1 / 3.4 14.2 / 3.1
4
16.6 / 3.1 24.8 / 3.6 25.8 / 3.4
at A10 / W35
2
kW / ---
3
10.3 / 3.3 14.1 / 3.5 14.7 / 3.1
4
17.8 / 3.3 26.6 / 3.8 29.1 / 3.6
3.4 Sound power level dB(A) 64 68 68
3.5 Sound pressure level at a distance of 10 m (air outlet side) dB(A) 37 41 41
3.6 Heating water flow with an internal pressure differential of m³/h / Pa 1.8 / 6500 2.3 / 5900 2.3 / 5900
3.7 Air flow m³/h 5500 8000 8000
3.8 Refrigerant; total filling weight type / kg R404A / 3.7 R404A / 4.2 R404A / 4.2
4 Dimensions, connections and weight
4.1 Device dimensions H x W x L cm 157 x 155 x 85 171 x 168 x 100 171 x 168 x 100
4.2 Device connections to heating system Inch
Thread 1 1/4''
external
Thread 1 1/4''
external
Thread1 1/4'' external
4.3 Weight of the transportable unit(s) incl. packing kg 284 351 355
5 Electrical connection
5.1 Nominal voltage; fuse protection V / A 400 / 20 T 400 / 25 T 400 / 25 T
5.2 Nominal power consumption
2
A2 W35 kW
4.9 6.1 7.4
5.3 Starting current with soft starter A 23 24 25
5.4 Nominal current A2 W35 / cosϕ A / --- 8.8 / 0,8 10.9 / 0.8 13.4 / 0.8
6 Complies with the European safety regulations
5
5. See CE declaration of conformity
55
7 Additional model features
7.1 Defrosting Automatic Automatic Automatic
Type of defrosting Reverse circulation Reverse circulation Reverse circulation
Defrosting tray included Yes (heated) Yes (heated) Yes (heated)
7.2 Heating water in device protected against icing
6
6. The heat circulating pump and the heat pump controller must always be ready for operation.
Yes Yes Yes
7.3 Performance levels 222
7.4 Controller internal/external External External External