The Classic FF350, FF360 and FF380 Propane is a range of automatically fully controlled, wall mounted, balanced flue, fanned gas boilers. Classic FF - Installation & Servicing. GENERAL. Boiler Size. FF 330. FF 340. FF 350. FF 360. FF 370. FF 380. FF 3 100. Boiler input.The boiler must be installed in a vertical position in accordance to the installation instructions. FLUE KITS. Telescopic Flue'B' Pack - contains: Flue turret, Boiler Manuals for the Ideal Classic FF380 appliance. Classic FF 380 Installation and User Guide · View Manual · Download - 2.24 MB Manuals and User Guides for Ideal Boilers Classic FF 380 P. We have 1 Ideal Boilers Classic FF 380 P manual available for free PDF download: Installation Manuals and User Guides for Ideal Boilers Classic FF 380. We have 1 Ideal Boilers Classic FF 380 manual available for free PDF download: Installation And To light the boiler. Refer to Frame 1. 1. CHECK THAT THE ELECTRICITY SUPPLY TO THE BOILER. IS OFF. 2. Open the controls access door by hinging downwards.