DROPS Air-to-Water Heat Pump - Technical Description

DROPS Air-to-Water Heat Pump

The air-to-water heat pump is designed for heating domestic hot water (DHW). The rotary compressor used has been optimized for condensation at high temperatures, meaning high DHW temperatures. Airflow through the heat exchanger is forced by an energy-efficient, high-performance, and modern EBM PAPST fan. Water heating takes place in a stainless steel plate heat exchanger, and water circulation is provided by a Wilo circulation pump – also suitable for potable water operation. The entire system is controlled by a controller equipped with an algorithm optimized for the design and operation of the heat pump. The housing is made of ABS plastic.

Air outlet
Air inlet
Hot water outlet
Cold water inlet
Control panel
Air outlet
Air inlet

AIR DRAWN FROM ONE ROOM AND EXHAUSTED INTO ANOTHER ROOM

AIR DRAWN FROM A ROOM AND EXHAUSTED OUTSIDE THROUGH A WALL

AIR DRAWN FROM OUTSIDE THROUGH A WALL AND EXHAUSTED OUTSIDE THROUGH A WALL

AIR DRAWN FROM OUTSIDE THROUGH A WALL AND EXHAUSTED OUTSIDE THROUGH THE ROOF

SEPARATION OF SUPPLY AND EXHAUST AIR

HEAT PUMP OPERATING WITH A HEAT RECOVERY UNIT

The heat pump and the heat recovery unit operate independently, so the ventilation ducts should also be separated. This ensures that when the heat recovery unit is running but the heat pump is not, air flows freely to the ventilation exhaust and not into the heat pump. Otherwise, it would reduce the efficiency of the heat recovery unit’s fan.

Application range		Inlet air temperature: 20°C	Inlet air temperature: 35°C
Outdoor temperature	min/max [°C]	+5 / +43	+5 / +43
Maximum DHW temperature with heat pump	°C	60	60
DHW temperature with electric heater	°C	75	75
Minimum installation area	m²	1	1
Heat transfer medium	-	Water	Water
Electrical parameters
Electrical supply	-	1/N/PE 220-240V/50Hz	1/N/PE 220-240V/50Hz
Recommended fuse	A	C6	C6
Max. start-up current of heat pump	A	15.2	15.2
Max. operating current of heat pump	A	3	3
Fan / pump power consumption	W	90 / max 55	90 / max 55
Power consumption for inlet air temperature:		min 0.29 kW, max 0.560 kW	min 0.29 kW, max 0.650 kW
Maximum heating capacity for inlet air temperature		1.98 kW	2.57 kW
Average heating capacity for inlet air temperature and DHW heating 10-60°C:		1.49 kW	1.9 kW
COP, water heating 10 ÷ 40°C:		4.33	6.9
COP, water heating 10 ÷ 45°C:		3.98	6.6
COP, water heating 10 ÷ 50°C:		3.55	5.7
COP, water heating 10 ÷ 55°C:		3.22	4.9
Heating time for 100 L water 10 ÷ 40°C:		2h:30min	1h:30min
Heating time for 100 L water 10 ÷ 45°C:		3h:12min	1h:54min
Heating time for 100 L water 10 ÷ 50°C:		4h:00min	2h:36min
Heating time for 100 L water 10 ÷ 55°C:		4h:42min	3h:24min

The above COP values and heating times were determined under the following conditions: inlet air temperature 20°C / 35°C. Pump connected directly to the water tank. Air drawn directly from the room. In different conditions, the values given above may change.

Refrigeration circuit
Compressor type		rotary
Compressor oil type		ATMOS-RB68EP/FVC68D Quantity: 320 ml ±20
Refrigerant / quantity	type / kg	R134a / 0.6 kg
Max. allowable pressure (low pressure)	bar	7
Max. allowable pressure (high pressure)	bar	23
Dimensions
Diameter	Ø mm	661
Height	mm	563
Weight	kg	45
Heating circuit parameters
Heating circuit connection fittings	inch	2xGW 3/4"
Minimum internal pipe diameter	mm	20
Flow rate	m³/h	0.280
Working medium	-	water / propylene glycol

The installed WILO pump allows direct connection of the DROPS heat pump to the domestic hot water installation.

Data sheet

Class	A
Weight [ kg ]	45
Height [ mm ]	563
Exhaust gas pipe size [ mm ]	200
Diameter [ mm ]	661
Outlet and inlet supply size [ inch ]	³⁄₄''
Installation	Horizantal, Floor, Internal
Steering	CUW pump
Mains voltage [ V ]	230
Warranty	2 years
Colour	White