18.5.7 Removing the temperature and pressure relief valve (7 bar) 1. Unscrew the nut and then unscrew the valve (see Fig. 18.63); 2. Reassemble in reverse order. Fig. 18.63 18.5.8 Removing & cleaning the condensate trap 1. Unscrew the cap of the condensate trap (see Fig. 18.64) 2. Empty the condensate products and rinse the condensate trap with clean water (see Fig. 18.65) 3. Reassemble in reverse order and fill the condensate trap with 1/2 litre of water before restarting the boiler. Fig. 18.64 Fig. 18.65 18.5.9 Removing the pressure gauge 1. Remove the casing as in step 18.2.1; 2. Pull the pressure gauge out (see Fig. 18.67); 3. Remove the clip “T4” securing the pressure gauge (see Fig. 18.68 ); 4. Reassemble in reverse order. T4 Fig. 18.66 Fig. 18.67 Fig. 18.68 56
18.5.10 Removing the pump 1. Carry out step 18.2.1; 2. Open the electrical box cover as in step 18.3.1 (Fig. 18.6); 3. Remove the pump plug from the control board and earth plug from earth socket “T1” (see Fig. 18.69); 4. Remove the pressure relief valve 3 bar as in step 18.6.5; 5. Unscrew the pump nut “T2” and remove the two clips “T3” on the pump volute (see Fig. 18.70); 6. Pull the pump toward you and remove the clip “T4” securing the pressure gauge (see Fig. 18.71 ); 7. Reassemble in reverse order. T3 T1 T2 T3 T4 Fig. 18.69 Fig. 18.70 Fig. 18.71 18.5.11 Removing the heating expansion vessel 1. Carry out step 18.2.1; 2. Remove the screw “U1” (see Fig. 18.72); 3. Pull the expansion vessel toward you and remove the nut “U2” with a No.17 spanner (see Fig. 18.73); 4. To ensure the easiest access to the hydraulic parts, hang the expansion vessel on the chassis without removing the nut (see Fig. 18.74); 5. Reassemble in reverse order. U2 U1 Fig. 18.72 Fig. 18.73 Fig. 18.74 18.5.12 Removing the D.H.W. expansion vessel 1. Remove the casing as in step 18.2.1; 2. Remove the nut “V1” with a No.24 spanner (see Fig. 18.75); 3. Remove the “Pal” nut 1/2 “V2” with a No.34 spanner (see Fig. 18.76); 4. Pull up the expansion vessel and unscrew the second “Pal” nut (see Fig. 18.77); 5. Reassemble in reverse order. V1 V2 Fig. 18.75 Fig. 18.76 Fig. 18.77 57
18.5.7 Removing the temperature and pressure relief valve (7 bar) 1. Unscrew the nut and then unscrew the valve (see Fig. 18.63); 2. Reassemble in reverse order. Fig. 18.63 18.5.8 Removing & cleaning the condensate trap 1. Unscrew the cap of the condensate trap (see Fig. 18.64) 2. Empty the condensate products and rinse the condensate trap with clean water (see Fig. 18.65) 3. Reassemble in reverse order and fill the condensate trap with 1/2 litre of water before restarting the boiler. Fig. 18.64 Fig. 18.65 18.5.9 Removing the pressure gauge 1. Remove the casing as in step 18.2.1; 2. Pull the pressure gauge out (see Fig. 18.67); 3. Remove the clip “T4” securing the pressure gauge (see Fig. 18.68 ); 4. Reassemble in reverse order. T4 Fig. 18.66 Fig. 18.67 Fig. 18.68 56
18.5.10 Removing the pump 1. Carry out step 18.2.1; 2. Open the electrical box cover as in step 18.3.1 (Fig. 18.6); 3. Remove the pump plug from the control board and earth plug from earth socket “T1” (see Fig. 18.69); 4. Remove the pressure relief valve 3 bar as in step 18.6.5; 5. Unscrew the pump nut “T2” and remove the two clips “T3” on the pump volute (see Fig. 18.70); 6. Pull the pump toward you and remove the clip “T4” securing the pressure gauge (see Fig. 18.71 ); 7. Reassemble in reverse order. T3 T1 T2 T3 T4 Fig. 18.69 Fig. 18.70 Fig. 18.71 18.5.11 Removing the heating expansion vessel 1. Carry out step 18.2.1; 2. Remove the screw “U1” (see Fig. 18.72); 3. Pull the expansion vessel toward you and remove the nut “U2” with a No.17 spanner (see Fig. 18.73); 4. To ensure the easiest access to the hydraulic parts, hang the expansion vessel on the chassis without removing the nut (see Fig. 18.74); 5. Reassemble in reverse order. U2 U1 Fig. 18.72 Fig. 18.73 Fig. 18.74 18.5.12 Removing the D.H.W. expansion vessel 1. Remove the casing as in step 18.2.1; 2. Remove the nut “V1” with a No.24 spanner (see Fig. 18.75); 3. Remove the “Pal” nut 1/2 “V2” with a No.34 spanner (see Fig. 18.76); 4. Pull up the expansion vessel and unscrew the second “Pal” nut (see Fig. 18.77); 5. Reassemble in reverse order. V1 V2 Fig. 18.75 Fig. 18.76 Fig. 18.77 57
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