Use only Eclipse model 5600-90A, 5600-91, 5602-91or 5600-91N4 scanners. Consult the burner manufacturer’s instructions for mounting location.When installing scanners, please consider the following: 1) Position the scanner within 457 mm (18") of the flame. 2) Bushing threads are 1/2 inch F.N.P.T. for scanner models 5600-90A, 5600-91 and 5600-91N4; model 5602-91 has 1 inch F.N.P.T. bushing threads. 3) The ambient temperature limits of each scanner varies, (see specifications). For higher temperatu