OXA-D — Hot water heating

Hot water heating (OXA-D). The classic high-efficiency option: it runs off district heating, a boiler house or a heat pump, which keeps running costs low and the installation dependable. A recirculating air heater with a vortex diffuser — and no ductwork.

Features

• 🔥 Copper-and-aluminium water coil
• 🌀 Vortex distribution, guide blades with Belimo actuator (0–90°)
• ♻️ Recirculation: draws the overheated air back down from ceiling level
• 🌬️ EBM-papst fan, stepless VAV control 0–100 %
• 🌡️ Temperature sensors on the inlet and on the supply air
• 📶 OXA control unit, OXA-V / V2 terminal, OXA-T2 sensors, Modbus RTU
• 🧽 Automatic dust removal by back-flushing

Technical data

Model	OXA-D-I	OXA-D-II
Fan speed, rpm	0~900	0~860
Recirculated air flow, m³/h	0~6700	0~9700
Voltage, V	380±5%	380±5%
Electrical power, kW	0~0.85	0~1.80
Current, A	0~1.65	0~3.60
Recommended mounting height, m	4~10	4~17
Control mode	Stepless VAV control
Sound level, dB	<60	<60

Dimensions and drawings

Dimension, mm	OXA-D-I	OXA-D-II
A	900	1100
B	990	1165
C	735	850
E	100	100
F	150	150
G	480	568
H	765	935
J	601	724
K	521	644
N (female thread)	DN32	DN40
Weight, kg	130	176
Water volume, l	5.8	9.8

Water supply and return connections are on the underside of the casing. DWG drawings are in the Downloads section.

Heating capacity table

Water temperature, °C	Model	Q, kW (10 °C)	ts, °C	Q, kW (15 °C)	Q, kW (20 °C)
90/70	D-I	66	43	61	56
80/60	D-I	57	39	52	47
70/50	D-I	46	34	42	38
60/40	D-I	38	29	33	28
90/70	D-II	103	43	96	88
80/60	D-II	88	37	81	74
70/50	D-II	74	33	66	59
60/40	D-II	59	28	51	44

Legend: Q — heating capacity · t_s — supply air temperature · m_w — water volume flow · Δp_w — water pressure drop. The 10/15/20 °C columns give the temperature of the recirculated air.

Maximum working pressure: 800 kPa · maximum supply air temperature: 60 °C · maximum ambient temperature: 40 °C. Full tables with water flow rates and pressure drops are in the PDF catalogue.

Non-standard versions (explosion-proof, anti-corrosion, with air purification, increased cooling capacity and other functional sections) are available on request through your regional sales representative. Where the mounting height falls outside the stated range, the unit is built to individual specification.