18.5.21 Removing the tank 1. Remove the casing as in steps 18.2.1 and 18.2.2; 2. Remove all clips, nuts (No. 24, 25, 30 spanner) and eletrical connections (sensor) from the tank (see Fig. 18.93 & 18.94); - Temperature and relief valve (7bar) in step 18.5.6 - Pressure relief valve (7bar) in step 18.5.7 - DHW expansion vessel in step 18.5.12 - Tank temperature sensor in step 18.5.15 - DHW temperature sensor in step 18.5.18 - Plate heat exchanger in step 18.5.20 3. Remove the nut “Z1” (N°30 spanner) and the “Pal” nut “Z2” (N°34 spanner) on the bottom of the boiler to disengage the pipe between the chassis and the thermal valve (see Fig. 18.95); 4. Remove the two screws “Z3” on the left side panel (see Fig. 18.96); 5. Remove the nut (No. 10 spanner ) on the top of the tank (see Fig. 18.97); 6. Pull up the tank to disengage it, and then toward you to remove it. 7. Reassemble in reverse order Fig.18. 93 Fig. 18.94 Z2 Z3 Z1 Fig. 18.95 Fig. 18.96 Fig. 18.97 60
19. FAULT FINDING GUIDE (Flow-chart) It is possible to detect and correct defects by using the standard fault finding diagrams described in this chapter. NOTE: THESE CHECKS ARE NOT EXHAUSTIVE. PRELIMARY CHECKS MAKE SURE THAT: 1 - There is sufficient water in the system 2 - The gas is turned on 3 - The electrical supply is turned on TURN THE SELECTOR KNOB TO IS THE POWER L.E.D. ON? NO YES 1 - Check the fuses 2 - Check the power supply cable, plug and outlet 3 - Check/replace the power supply to the P.C.B. 4 - Check/replace the P.C.B ESTAT E TURN THE DHW CONTROL KNOB TO MAX AND PUSH ON COMFORT BUTTON NO YES IS DHW BEING DRAWN NO YES TURN THE CH CONTROL KNOB TO MAX NO YES IS CLOCK TURNED ON AND THE ROOM THERMOSTAT TURNED UP NO YES A FC P012 61
18.5.21 Removing the tank 1. Remove the casing as in steps 18.2.1 and 18.2.2; 2. Remove all clips, nuts (No. 24, 25, 30 spanner) and eletrical connections (sensor) from the tank (see Fig. 18.93 & 18.94); - Temperature and relief valve (7bar) in step 18.5.6 - Pressure relief valve (7bar) in step 18.5.7 - DHW expansion vessel in step 18.5.12 - Tank temperature sensor in step 18.5.15 - DHW temperature sensor in step 18.5.18 - Plate heat exchanger in step 18.5.20 3. Remove the nut “Z1” (N°30 spanner) and the “Pal” nut “Z2” (N°34 spanner) on the bottom of the boiler to disengage the pipe between the chassis and the thermal valve (see Fig. 18.95); 4. Remove the two screws “Z3” on the left side panel (see Fig. 18.96); 5. Remove the nut (No. 10 spanner ) on the top of the tank (see Fig. 18.97); 6. Pull up the tank to disengage it, and then toward you to remove it. 7. Reassemble in reverse order Fig.18. 93 Fig. 18.94 Z2 Z3 Z1 Fig. 18.95 Fig. 18.96 Fig. 18.97 60
19. FAULT FINDING GUIDE (Flow-chart) It is possible to detect and correct defects by using the standard fault finding diagrams described in this chapter. NOTE: THESE CHECKS ARE NOT EXHAUSTIVE. PRELIMARY CHECKS MAKE SURE THAT: 1 - There is sufficient water in the system 2 - The gas is turned on 3 - The electrical supply is turned on TURN THE SELECTOR KNOB TO IS THE POWER L.E.D. ON? NO YES 1 - Check the fuses 2 - Check the power supply cable, plug and outlet 3 - Check/replace the power supply to the P.C.B. 4 - Check/replace the P.C.B ESTAT E TURN THE DHW CONTROL KNOB TO MAX AND PUSH ON COMFORT BUTTON NO YES IS DHW BEING DRAWN NO YES TURN THE CH CONTROL KNOB TO MAX NO YES IS CLOCK TURNED ON AND THE ROOM THERMOSTAT TURNED UP NO YES A FC P012 61
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