Technical Information, Mffi | Ariston A/23 MFFI, A/27 MFFI guide

chamber visually.

4- Visual check of the combustion: clean burners if necessary.

5- With reference to point 3, dismantle and clean the combustion chamber if necessary.

6- With reference to point 4, dismantle and clean the injectors if necessary.

7- Visual check of the primary heat exchanger:

-check for overheating of the exchangers fins;

-clean the exhaust side of the exchanger and fan if necessary.

8- Regulate the gas pressure, ignition pressure, partial flame, maximum flame.

9- Check proper operation of the heating safety system:

-maximum safety temperature;

-maximum safety pressure.

10- Check the proper operation of the gas safety system:

-gas or flame safety device;

-gas valve safety device.

11- Check that the electrical connections have been made in compliance with the instructions shown in the installation instructions.

12- Check the efficiency of the hot water supply (flow and temperature).

13- Check general operation of the appliance.

14- Check the exhaust system for the combustion products.

1.2Technical Information

				A/23 MFFI	A/27 MFFI

CE Certification
Heat Input		max/min	kW	25.6/11.0	29.8/12.0
Heat Output		max/min	kW	23.1/9.2	27.3/10.1
Efficiency of Nominal Heat Input		%		90.2	91.6
Efficiency at 30% of Nominal Heat Input		%		87.8	88.3
Heat Loss to the Casing (³T=50°C)		%		1.2	1.3
Flue Heat Loss with Burner Operating		%		8.6	7.1
Flue Heat Loss with Burner Off		%		0.4	0.4
Maximum Discharge of Fumes (G20-G25)		Kg/h		59	62
Residual Discharge Head		mbar		1.15	1.4
Consumption at Nominal Capacity (G20-G25) m3/h				2.72/3.32	3.16/3.86
Gas Consumption after 10 Minutes*		m3		0.32/0.39	0.37/0.45
(15°C, 1013 mbar) (G30-G31)		Kg/h		2.02/2.00	2.35/2.32
Temp. of exhaust fumes at nominal
capacity (G20-G25)		°C		137	128
CO2 Content		%		5.8	6.6
O2 Content		%		9.2	8.0
CO Content		ppm		32	34
Minimum Ambient Temperature		°C		+5	+5
Head Loss on Water Side (max) (³T=20°C)		mbar		200	200
Residual Head of System		bar		0.25	0.25
Heating Temperature		max/min °C		82/42	82/42
Domestic Hot Water Temperature		max/min °C		56/36	56/36
D.H.W. Flow Rate ³T=35°C		l/min		9.5	11.2
D.H.W. Flow Rate ³T=35°C		gal/min		2.1	2.5
D.H.W. Minimum Flow Rate		l/min		2.6	2.6
Pressure of Domestic Hot Water		max/min bar		6/0.2	6/0.2
Expansion Vessel Capacity		l		7	7
Expansion Vessel Pre-load Pressure		bar		1	1
Maximum Water Content in System		l		145	145
Maximum Heating Pressure		bar		3	3
Nominal Pressure Natural Gas (G20-G25)		mbar		20-25	20-25
LPG	(G30-G31)	mbar		30-37	30-37
Electrical Supply		V/Hz		230 / 50	230 / 50
Power Consumption		W		150	190
Protection Grade of Electrical System		IP		44	44
Internal Fuse Rating				FAST 2 AT	FAST 2 AT
Weight		Kg.		47	47

G.C. Number

47-116-10

47-116-12

*Calculated at 70% maximum output

B023