18.5.13 Removing the overheat thermostat 1. Remove the casing as in step 18.2.1; 2. Pull off the thermostat connections. Then remove the thermostat from the pipe by releasing it’s securing clip (see Fig. 18.78); 18.5.14 Removing the temperature sensors (N.T.C’s) 1. Remove the casing as in step 18.2.1; 2. Pull off the NTC connections. Then remove the NTC from the pipe by releasing it’s securing clip (see Fig. 18.79). Fig. 18.78 Fig. 18.79 18.5.15 Removing the tank temperature sensor 1. Remove the casing as in step 18.2.1 ; 2. Pull off the NTC connections. Then remove the NTC from the tank by removing the screws (see Fig. 18.80). 18.5.16 Removing the water pressure gauge 1. Remove the casing as in step 18.2.1 ; 2. Pull off the connections. Then remove the clip from the pipe (see Fig. 18.81). Fig.18.80 Fig.18.81 18.5.17 Removing the flow switch 1. Remove the casing as in step 18.2.1 ; 2. Remove electrical connection and the two clips fixing the flow switch (see Fig. 18.82); 3. Pull down the lower pipe and remove the flow switch; 4. Reassemble in reverse order, the arrow must be positioned correctly (see Fig. 18.83 and 18.84); 5. Reassemble in reverse order Fig. 18.83 Fig. 18.84 Fig. 18.82 58
18.5.18 Removing the DHW temperature sensor 1. Carry out step 18.2.1; 2. Turn the sensor support anticlockwise to liberate it (see Fig.18.85); 3. Remove the connections (see Fig.18.86); 4. Reassemble in reverse order. Fig. 18.85 Fig. 18.86 18.5.19 Removing the non return valve 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip “X1” to liberate the DHW expansion vessel (see Fig. 18.87); 3. Remove the two clips “X2” and remove the pipe (see Fig. 18.87); 4. Remove the two screws from the bottom of the boiler (see Fig. 18.88) and pull the block toward you; 5. Remove the limiter from the block (see Fig.18.89); 6. Reassemble in reverse order. X2 X2 X1 Fig. 18.87 Fig. 18.88 Fig. 18.89 18.5.20 Removing the plate heat exchanger 1. Carry out step 18.2.1; 2. Remove the isolating cover by pulling it toward you (see Fig. 18.90); 3. Remove the screw “Y1” with a N°8 spanner (see Fig.18.91); 4. Remove the two clips “Y2” on the right part (see Fig.18.91); 5. Pull up the exchanger to disengage it from the pipes and remove the screw T20 “Y3” (see Fig.18.92); 6. Reassemble in reverse order. Y3 Y1 Y2 Fig. 18.90 Fig. 18.91 Fig. 18.92 59
18.5.13 Removing the overheat thermostat 1. Remove the casing as in step 18.2.1; 2. Pull off the thermostat connections. Then remove the thermostat from the pipe by releasing it’s securing clip (see Fig. 18.78); 18.5.14 Removing the temperature sensors (N.T.C’s) 1. Remove the casing as in step 18.2.1; 2. Pull off the NTC connections. Then remove the NTC from the pipe by releasing it’s securing clip (see Fig. 18.79). Fig. 18.78 Fig. 18.79 18.5.15 Removing the tank temperature sensor 1. Remove the casing as in step 18.2.1 ; 2. Pull off the NTC connections. Then remove the NTC from the tank by removing the screws (see Fig. 18.80). 18.5.16 Removing the water pressure gauge 1. Remove the casing as in step 18.2.1 ; 2. Pull off the connections. Then remove the clip from the pipe (see Fig. 18.81). Fig.18.80 Fig.18.81 18.5.17 Removing the flow switch 1. Remove the casing as in step 18.2.1 ; 2. Remove electrical connection and the two clips fixing the flow switch (see Fig. 18.82); 3. Pull down the lower pipe and remove the flow switch; 4. Reassemble in reverse order, the arrow must be positioned correctly (see Fig. 18.83 and 18.84); 5. Reassemble in reverse order Fig. 18.83 Fig. 18.84 Fig. 18.82 58
18.5.18 Removing the DHW temperature sensor 1. Carry out step 18.2.1; 2. Turn the sensor support anticlockwise to liberate it (see Fig.18.85); 3. Remove the connections (see Fig.18.86); 4. Reassemble in reverse order. Fig. 18.85 Fig. 18.86 18.5.19 Removing the non return valve 1. Carry out steps 18.2.1 and 18.2.2; 2. Remove the clip “X1” to liberate the DHW expansion vessel (see Fig. 18.87); 3. Remove the two clips “X2” and remove the pipe (see Fig. 18.87); 4. Remove the two screws from the bottom of the boiler (see Fig. 18.88) and pull the block toward you; 5. Remove the limiter from the block (see Fig.18.89); 6. Reassemble in reverse order. X2 X2 X1 Fig. 18.87 Fig. 18.88 Fig. 18.89 18.5.20 Removing the plate heat exchanger 1. Carry out step 18.2.1; 2. Remove the isolating cover by pulling it toward you (see Fig. 18.90); 3. Remove the screw “Y1” with a N°8 spanner (see Fig.18.91); 4. Remove the two clips “Y2” on the right part (see Fig.18.91); 5. Pull up the exchanger to disengage it from the pipes and remove the screw T20 “Y3” (see Fig.18.92); 6. Reassemble in reverse order. Y3 Y1 Y2 Fig. 18.90 Fig. 18.91 Fig. 18.92 59
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