Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual Manual pdf 32 page image

10 Inspection and maintenance32 Installation and maintenance instructions ecoTEC exclusive 0020193966_0110.3.2 Cleaning the heat exchanger1. Protect the folded down electronics box against sprayedwater.1 2342. Never undo the four nuts on the stud bolt (1) or tightenthem.3. Clean the heating coil (3) of the heat exchanger (4) us-ing water or, if required, vinegar (to a maximum of 5%acid). Allow the vinegar to act on the heat exchanger for20 minutes.4. Rinse away any loose dirt with a sharp jet of water oruse a plastic brush. Do not point the water jet directlyat the insulating mat (2) on the back of the heat ex-changer.◁ The water flows out of the heat exchanger throughthe condensate trap.10.3.3 Checking the burner2311. Check the surface of the burner (1) for damage. If yousee any damage, replace the burner.2. Fit a new burner flange seal (3).3. Check the insulating mat (2) on the burner flange. If younotice any signs of damage, replace the insulating mat.10.3.4 Installing the compact thermal module13245761. Connect the compact thermal module (5) to the heatexchanger (4).2. Tighten the four nuts (1) in a cross-wise pattern until theburner flange fits closely and uniformly onto the matingsurfaces.– Tightening torque: 6 Nm3. Reconnect the plug (2) for the ignition line and the plug(3) for the earth line.4. Reconnect the plug (6) to the gas valve.5. Reconnect the plug (7) to the fan motor.6. Connect the gas line using a new seal. In the process,secure the gas pipe against twisting.7. Open the gas isolator cock.8. Make sure that there are no leaks.9. Check that the sealing ring in the air intake pipe is posi-tioned correctly in the seal seat.10. Reconnect the air intake pipe to the intake nozzle.11. Secure the air intake pipe with the retaining screw.12. Check the gas flow pressure. (→ Page 21)10.4 Cleaning the condensate trap1. Remove the lower section from the condensate trap.2. Flush out the lower section with water.3. Fill the lower section with water up to about 10 mm be-low the upper edge.4. Attach the lower section to the condensate trap.