18.5 Access to the Water Circuit Important ! Before any component is removed (except the 3 way valve motor), the boiler must be drained of all water. 18.5.1 Drain down For the primary circuit : 1. Carry out steps 18.2.1 & 18.2.2; 2. Open the pressure relief valve (on the pump) (see Fig. 18.50) or the drain screw “P1” on the right hydraulic block (see Fig.18.51); For the D.H.W. circuit : 1. Close the water inlet tap; 2. Open a D.H.W. hot water tap; 3. Open the drain screw “P2” on the boiler (see Fig. 18.51) To drain the tank more quickly remove the cap on the tank (see Fig. 18.52); Important!! Take care when removing the cap to drain the cylinder P2 P1 Fig. 18.50 Fig. 18.51 Fig. 18.52 18.5.2 Removing the 3 way valve 1. Carry out steps 18.2.1 and 18.2.2 ; 2. Remove the clip “Q1” and the three way valve motor (see Fig.18.53); 3. Remove the two screws “Q2” (see Fig.18.54); Q1 Fig. 18.53 Q2 Fig. 18.54 4. Then pull up the three way valve shutter (see Fig.18.55). 5. Reassemble in reverse order. Fig. 18.55 54
18.5.3 Removing the heating return filter 1. Unscrew 1/4 ball screw “R” (see Fig. 18.56); 2. Pull it down (see Fig. 18.57); 3. Reassemble in reverse order. 18.5.4 Removing the by-pass 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the heating filter as in step 18.6.3 ; 3. Remove the clip and pull out the By-pass (see Fig. 18.58 and 18.59); 4. Reassemble in reverse order. R Fig. 18.56 Fig. 18.58 Fig. 18.57 Fig. 18.59 18.5.5 Removing the pressure relief valve (3 bar) 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip securing the valve and disconnect the safety valve outlet (see Fig. 18.60) and pull it toward the left; 3. Disconnect the flexible pipe (see Fig. 18.61); 4. Reassemble in reverse order. Fig. 18.60 Fig. 18.61 18.5.6 Removing the pressure relief valve (7 bar) 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip securing the valve and unscrew the nut with a N°24 spanner (see Fg. 18.62); 3. Reassemble in reverse order. Fig. 18.62 55
18.5 Access to the Water Circuit Important ! Before any component is removed (except the 3 way valve motor), the boiler must be drained of all water. 18.5.1 Drain down For the primary circuit : 1. Carry out steps 18.2.1 & 18.2.2; 2. Open the pressure relief valve (on the pump) (see Fig. 18.50) or the drain screw “P1” on the right hydraulic block (see Fig.18.51); For the D.H.W. circuit : 1. Close the water inlet tap; 2. Open a D.H.W. hot water tap; 3. Open the drain screw “P2” on the boiler (see Fig. 18.51) To drain the tank more quickly remove the cap on the tank (see Fig. 18.52); Important!! Take care when removing the cap to drain the cylinder P2 P1 Fig. 18.50 Fig. 18.51 Fig. 18.52 18.5.2 Removing the 3 way valve 1. Carry out steps 18.2.1 and 18.2.2 ; 2. Remove the clip “Q1” and the three way valve motor (see Fig.18.53); 3. Remove the two screws “Q2” (see Fig.18.54); Q1 Fig. 18.53 Q2 Fig. 18.54 4. Then pull up the three way valve shutter (see Fig.18.55). 5. Reassemble in reverse order. Fig. 18.55 54
18.5.3 Removing the heating return filter 1. Unscrew 1/4 ball screw “R” (see Fig. 18.56); 2. Pull it down (see Fig. 18.57); 3. Reassemble in reverse order. 18.5.4 Removing the by-pass 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the heating filter as in step 18.6.3 ; 3. Remove the clip and pull out the By-pass (see Fig. 18.58 and 18.59); 4. Reassemble in reverse order. R Fig. 18.56 Fig. 18.58 Fig. 18.57 Fig. 18.59 18.5.5 Removing the pressure relief valve (3 bar) 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip securing the valve and disconnect the safety valve outlet (see Fig. 18.60) and pull it toward the left; 3. Disconnect the flexible pipe (see Fig. 18.61); 4. Reassemble in reverse order. Fig. 18.60 Fig. 18.61 18.5.6 Removing the pressure relief valve (7 bar) 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip securing the valve and unscrew the nut with a N°24 spanner (see Fg. 18.62); 3. Reassemble in reverse order. Fig. 18.62 55
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