Uno - Installation Manual

3.6 COMBUSTION ANALYSIS

3.6 COMBUSTION ANALYSIS FIG. 3.1 FU008A The flue connector has two apertures, readings can be taken for the temperature of the combustion by-products and of the combustion air, as well as of the concentrations of O2 and CO2, etc. . The best test conditions can be achieved by using the test points on the flue manifold. Knob “A” must be in either the “Summer” or Winter” setting and knob “C” must be turned to the reset position for 10 seconds. The yellow L.E.D. will begin to flash. To carry out the test in “Summer” mode the D.H.W. must be withdrawn. The boiler will revert to its normal operation after 5 minutes or by turning knob “C” to the off position. 3.7 BOILER SAFETY SYSTEMS The boiler is fitted with the following devices (see section 3.2 for references). 1 - IGNITION FAILURE: This control signals an ignition failure on the burner 10 seconds after a lighting failure. The L.E.D. “B” will illuminate to signal the shutdown status. The system can be reset by turning and releasing the knob “C” in Reset position after checking to make sure that the gas cock is open. 2 - CIRCULATION FAILURE: This shut down is controlled by 2 probes, it stops the boiler in the event of there being; no water in the primary circuit or no water circulation. In the event of this shut down the red L.E.D. “B” and the yellow L.E.D. “D” will illuminate. To reset the boiler it is necessary to turn knob “C” to the reset position and then release it, once the water pressure in the system has been checked on the pressure gauge. 3 - OVERHEATING: This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 105°C. The red L.E.D.s “B” and “D” will illuminate to signal this shutdown status. The system can be reset by waiting a few minutes for the primary exchanger to cool down and then by turning and releasing the “C” knob in Reset position. 4. LIMESCALE BUILD-UP: The boiler is equipped with a device that limits the formation of Limescale in the secondary exchanger by controlling the temperature of the domestic hot water (max 65°C) 5. ANTI-FROST DEVICE: The boiler is equipped with a device that in the event of the water temperature in the boiler falling below 8°C causes the pump to activate until the water reaches a temperature of approx. 18°C. Should the temperature fall below 5°C the diverter valve switches to the D.H.W. circuit and the burner ignites at minimum power until a temperature of approx. 33°C is reached. This device operates only if the boiler is functioning perfectly and: - the system pressure is sufficient; - the boiler is powered electrically; - the gas is distributed. 6 - EXHAUST DISCHARGE ANOMALY SHUTDOWN: The boiler is fitted with safety devices, which in the event of defective discharge of exhaust fumes, automatically interrupts the gas supply, thereby shutting off the boiler. The shutdown of the boiler is temporary and is indicated by the illumination of the yellow L.E.D. “D” . Once this the discharge state of exhaust fumes has returned to normal, the boiler automatically turns back on. 7 - SAFETY SHUTDOWN: At the start of every lighting phase, the P.C.B. performs a series of internal controls. If a malfunction occurs, the boiler will shutdown until the problem has been resolved. 18

3.8 DRAINING THE SYSTEM Draining the heating system. The heating system must be emptied as follows: - Turn off the boiler; - Open the drain valve for the system and place a container below to catch the water that comes out; - Empty the system at the lowest points (where present). If you plan on not using the heating system for an extended period of time, it is recommended that you add antifreeze with an ethylene glycol base to the water in the heating lines and radiators if the ambient temperature drops below 0°C during the winter. This makes repeated draining of the entire system unnecessary. Draining the domestic hot water system. Whenever there is the danger of the temperature dropping below the freezing point, the domestic hot water system must be drained as follows: -Turn off the general water valve for the household plumbing system; -Turn on all the hot and cold water taps; - Empty the remaining water from the lowest points in the system (where present). 19