ACCUMULATION OF EUROPEAN CLASS

ACCUMULATION OF EUROPEAN CLASS

Total comfort MODEL nominal output kw minimum output kw DUA PLUS B TN DUA PLUS B TFS natural draught room sealed forced draught 28 12.4 28 12.4 DUA PLUS B was born from the optimization of the accumulation design, which conjugates the maximum of the performances obtainable from a 60 liter D.H.W. storage tank with a fluid and strong drawing, designed to become instantaneous, without solution of continuity, thanks to the 28 kw completely exchanged in this refined wall hung boiler. The user will appreciate mainly: the quickness in the temperature recovering time of the storage tank, so that more warm water can be used; the quickness, for the heating system, in reaching the steady state conditions, thanks to the use of a new microprocessor which allows the optimization of the boiler operation in both systems, with modulating or On/Off control. Furthermore, special attention has been paid to the reduction of the noisy emissions for the completion of the comfort reachable with the DUA PLUS B.

The mechatronics of DUA PLUS B High efficiency copper mono-thermal heat exchanger with cylindrical pipes and silicon coating Ultra-silent stainless steel burner with 15 ramps Ultra-fast 60 liter storage tank, enameled according to DIN 4753, with closed cells PU insulation. Double safety with two ignition electrodes IMPULSE The pump is automatically activated for 5 seconds by the electronic card in order to avoid jammings. 0 h 16 h 32 h 48 h TIME (hours) Two specific circulating pumps with built-in air venter, for C.H. and storage tank loading Timer for pump anti-jam function Manual reset of non-return valves, without removing the valve Inspection flange for storage tank cleaning, with magnesium anode Independent NTC sensors, for C.H. and D.H.W. Automatic differential by-pass for a perfect calibration of the C.H. system flow rate Simple use of the boiler controls on the swinging panel board, with diagnostics by LED Anti-frost protection

The well-being controls Easy to use DUA PLUS B is designed to guarantee the maximum ease to the user. The panel board has been studied according to the most recent fundamental ergonomic rules: the selector switch of the primary functions is placed in the center, with, all around, the secondary controls. A series of led indicate the functions ON, show the temperatures of heating and domestic hot water and the type of fault which could have occurred within the boiler. Double scale thermometer Through this thermometer it is possible to read: - the C.H. flow temperature on the L.H. side scale; - the D.H.W. temperature on the R.H. side scale. Reset button Button resetting the boiler operation after a lock-out of the burner control. Lockout warning lamp Indicates the lock-out of the burner control. Fault signaling lamp Indicates a fault in the boiler operation. Burner On Lamp Indicates the good operation of the burner. Supply line On Lamp Indicates the power supply is On. Outer sensor calibration button Adjust the compensation curve for the control of the room temperature depending on the outer temperature (it works only when the outer temperature sensor is fitted). Heating only position Off/anti-frost position Summer position Winter position Multifunction switch the boiler works for C.H. only. the boiler is Off; only anti-frost protection is On. he boiler works for D.H.W. production only. the boiler works for heating and D.H.W. production. Signaling lamp The lamp is on when s.f.b. is selected. Special functions button Re-activates the boiler after certain technical services. Heating temperature adjustement This knob allows the adjustement of the C.H. flow temperature. Adjustement range: 35 to 85 C. D.H.W. temperature adjustement This knob allows the adjustement of the D.H.W. temperature. Adjustement range: 35 to 65 C.

From the power the best solutions DUA PLUS B 28 modulating kw The ultra-fast D.H.W. tank of DUA PLUS B has: Storage capacity of 60 liters Production of 200 liters of hot water at 45 C in 10 min, with an inlet temperature of 15 C Recovering time of 5.5 min (60 liters at 45 C) From 15 to 65 C in 8 min Output exchanged: 28 kw Exchange surface: 0.8 m 2 Length of the coil: 10.4 m Insulation thickness: 30 mm The storage tank is manufactured with an innovative glass lining system, with electrostatic powder deposit. It offers considerable advantages: Increase in the corrosion resistance, thanks to the pre-treatment of the whole steel surface to be enameled, with a pneumatic sand blasting, made with steel shots which removes all the machining residues and eliminates all eventual welding seams imperfections. Higher resistance to the scaling deposits, thanks to the glossy inner surfaces of the tank, which impede the grappling of the small scaling particles. High increase of the shock resistance, thanks to the elasticity of the lining. Special attention is paid to the insulation, made of two shells of PU foam, CFC free. 10 Detail of the D.H.W. storage tank D.H.W. PRODUCTION TIME Recovering time from 15 to 65 C in 8 min only. Continuous D.H.W. production: 15 l/min at 45 C. 200 liters in10 min! (with t 25 K at 45 C)

To heat and economize HEATING NTC TEMPERATURE ON OFF A BAND ANTIFAST 3 minutes DUA PLUS B is a wall hung boiler designed to speedily and silently heat medium and large size houses. ANTI-FAST DIAGRAM PRE-SET TEMPERATURE BOILER RE-STARTING TEMPERATURE B BAND ANTIFAST < 3 minutes BOILER TIME t 15 C The 28 kw, to avoid energy waste, are controlled by a microprocessor which modulates the output from 12.5 to 28 kw through the heating NTC temperature sensor. Its ANTI-FAST system reduces the On and Off cycles, responsible for the high consumptions. The ANTI-FAST system is an electronic ignition delaying device which acts after the switch Off of the burner, due to the temperature attainment (the pre-set temperature). If the room thermostat stays on demand, the boiler is switched On after about three minutes (A BAND), time which is reduced to zero if the boiler temperature goes down quickly of 15 C against the pre-set temperature (B BAND). Advantages: The quickness, for the heating system, in reaching the steady state conditions. On-Off cycles reductions, with consequent consumption reduction and components wear. AVAILABLE AS ACCESSORY Code No. 00261950 The TM 2000 clever comfort TM 2000 is a compensator which optimizes, automatically all the parameters, by modulation of: the output the central heating temperature the ignition delaying device ANTI-FAST up to 10 min interval, if necessary. So, it is possible to install DUA PLUS B boilers in installations which demand for a small heating output, thus avoiding high fuel waste and having, in the mean time, the advantage of the large availability of D.H.W., specific of the DUA PLUS B. The functions of TM 2000 are: Control of the requested room temperature Two changeable heating programs On/off times Continuous adjustments Economic reduction Visualization and modification of the operation and safety parameters of the boiler Anti-frost protection

Accessories and mounting jig KIT A KIT B Thanks to the mounting jig supplied with the boiler, to the flue duct kits and to a series of chrono-thermostat, DUA PLUS B offers excellent solutions for each installation. AIR/SMOKE COAXIAL DUCTS Code No. KIT5500C AIR/SMOKE SEPARATE DUCTS Code No. 00360535 R - C.H. return 3/4" G - Gas 3/4" M - C.H. flow 3/4" C - Hot water outlet 1/2" F - Cold water inlet 1/2" OUTER TEMPERATURE SENSOR DIGITAL WEEKLY CHRONO-THERMOSTAT ELECTRONIC ANALOGUE DAILY CHRONO- METAL MOUNTING JIG Code No. SND 0140C SD 700 Code No. 00260738 THERMOSTAT Code No. 00260737 Code No. 00211079 Technical data Model NOMINAL AND MINIMUM OUTPUT NOMINAL INPUT WATER EFFICIENCY AT 100 LOAD WATER EFFICIENCY AT 30 LOAD COMBUSTION EFFICIENCY AT 100 LOAD HEAT LOSSES THROUGH THE CASING MIN/MAX MAX SMOKE TEMPERATURE SMOKE FLOW RATE MIN/MAX CO 2 CHIMNEY HEAT LOSSES WITH BURNER IN OPERATION MIN/MAX CHIMNEY HEAT LOSSES WITH BURNER OFF MIN/MAX APPLIANCE CATEGORY MIN WATER THROUGHPUT IN THE C.H. CIRCUIT WITH t = 20K C.H. CIRCUIT MIN/MAX WORKING PRESSURE PRIMARY CIRCUIT WATER CONTENT D.H.W. MIN/MAX WORKING PRESSURE D.H.W. TANK/CLOSED EXPANSION VESSEL CAPACITY C.H. CIRCUIT MAX WATER CONTENT * D.H.W. FLOW ADJUSTER CONTINUOUS D.H.W. PRODUCTION ** AVAILABILITY OF D.H.W. ELECTRICAL SUPPLY TENSION/FREQUENCY MAIN FUSE MAXIMUM OUTPUT ABSORBED DEGREE OF PROTECTION NET WEIGHT OPTIONAL: D.H.W. CIRCUIT SUPPLEMENTARY EXPANSION VESSEL Code No. 00360636 kw kw C g/s l/min bar l bar l l l/min l/min l V-Hz A(F) W IP kg DUA PLUS BTN 28 27,9 / 12,5 31 89,95 / 89,89 89,21 / 87,34 92,2 / 88,6 2,47 / 2,25 68,9 / 87,5 22,8 / 25,6 2,35 / 4,6 11,4 / 7,8 0,449 II2H3+ 8,9 0,5 / 3 3,25 0,5 / 6 60 / 7,5 139,9 12 15,99 175 230/50 4 89 X4D 82 DUA PLUS BTFS 28 28,2 / 12,4 31 90,97 / 89,9 88,21 / 87,35 91,9 / 85,8 0,23 / 0,93 98,5 / 116,9 18,7 / 18,8 2,7 / 6,2 14,2 / 8,1 0,489 II2H3+ 8,8 0,5 / 3 3,25 0,5 / 6 60 / 7,5 139,3 12 16,17 175 230/50 4 148,5 X4D 89 Manometric Head H (m) 870 600 485 DIAGRAM FLOW RATE/MANOMETRIC HEAD 6 5 4 3 2 1 0 V1 V2 100 300 500 700 900 1100 1300 Flow rate (Q) l/h (*) Calculated for a maximum temperature of 90 C (**) Medium flow rate for a t = 25 K V3

AG S.p.A. 46033 casteldario - mantova - italy -tel. 0376/57001 (r.a.) - telefax 0376. 660556 - e-mail: info@unical-ag.com Unical AG declines any liability for the inaccuracies that may appear due to errors in transcription or printing. It also reserves the right to introduce those modifications to its products that it considers necessary or useful, without compromising the essential characteristics of the said products.