Ideal Boilers isar m30100 Installation And Servicing

43SERVICINGisar - Installation and Servicing67 SAFETY RELIEF VALVE REPLACEMENT1. Refer to Frame 50.2. Remove the casing front andbottom panels. Refer toFrames 42 & 43.3. Drain the boiler. Refer to Frame 69.4. Remove the discharge pipe.5. Remove the 4 screws retaining the rear support plate andwithdraw the plate.Note.The M4 screws fit the casing and the self -tappingscrews fit the plastic pump and valve housings, asshown.6. Withdraw the securing pin.68 AUTOMATIC AIR VENT REPLACEMENT1. Refer to Frame 50.2. Remove the boiler front and sealing panels. Refer toFrames 42 & 43.3. Drain the boiler. Refer to Frame 69.4. Unscrew the air vent from the extension pipe on theboiler boss.5. Fit the new air vent, complete with 'O' ring provided,and reassemble in reverse order.Note.In the event that the extension pipe is removed atthe same time as the air vent, remove it from theair vent and refit it into the heat exchanger beforefitting the new air vent, ensuring that its ‘O’ ringseal is in place.IMPORTANT.Ensure that the vent cap (A) is loose.6. Refill the boiler. Refer to Frame 29.7. Check the operation of the boiler. Refer to Frame 50.7. Remove the safety valve.8. Fit the new safety valve and refit the securing pin.9. Reassemble in reverse order, ensuring correct locationof screws in the support plate and that tabs on thepump and valve housings engage in slots.10. Reconnect the discharge pipe.11. Refill the boiler. Refer to Frame 29.12. Check operation of the boiler. Refer to Frame 50.Support plate M4 screw2012M4 screwSelf tapperscrewDischarge pipeSafety relief valveSecuring pin2039Ecl 2098Air ventVent cap (A)SERVICING