Trial for Ignition Period : The interval of time during which main burner fuel is permitted to be delivered into the ignition zone before the flame-sensing device is required to detect flame
NFPA 31 Standard for the Installation of Oil-Burning Equipment, 2001 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/31 /LPI-AAA_ROPagenda_06-09.pdf, (Std: Install of Oil-Burn Equip - Amer) {195 NFC}