Unical KUTter R 28, Installation And Servicing Manual

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2.4 - OPErATINg DATA AccOrDINg TO UNI 10348
For the adjustment data: NOZZLES - PRESSURE - DIAGRAMS - FLOW RATES - CONSUMP-
TION refer to the paragraph ADAPTATION TO OTHER TYPES OF GAS.
2.3.2 - PrODUcTION Of DOMESTIc HOT WATEr KUTTEr B 28
12 l/min.
47 °C
15 °C
Time (sec)
w
ithdrawal T
emperature (°C)
KUTTER r 28 B 28
Nominal heat input in CH / DHW mode kW 28 / 28 28 / 28
Minimum heat input with Nat. Gas / Propane kW
4,4 / 5,6 4,4 / 5,6
Nominal heat output kW 26,9 26,9
Minimum heat output kW 4,2 4,2
Nominal output in condensation 50/30 °C kW 28,6 28,6
Minimum heat output in condensation 50/30 °C kW 4,52 4,52
Combustion efficiency at full load % 97,41 97,41
Combustion efficiency at part load % 98,13 98,13
Heat losses through the casing (min.-max.) %
3,81 - 1,18 3,81 - 1,18
(*) Net flue gas temperature tf-ta (max.) °C 53,5 53,5
Flue gas mass flow rate (min.-max) g/s 1,93 - 12,27 1,93 - 12,27
Air excess λ % 20,57 20,57
CO
2
%
9,5 - 9,5 9,5 - 9,5
CO at 0% of O
2
(min. - max) ppm
111 - 9 111 - 9
Maximum production of condensate kg/h
4,51 4,51
NOx class 5 5
Chimney heat losses with burner ON (min. - max.)
%
1,87 - 2,59 1,87 - 2,59
Chimney heat losses with burner OFF % 0,30 0,30
Chimney base maximum pressure available min. / max. Pa 2 - 70 2 - 70
Notes: (*) Room Temperature = 20°C Data obtained with appliance operated with Nat Gas (G20)