These ignition modules provide ignition sequence, flame monitoring and safety shutoff for intermittent pilot central furnaces and heating appliances. S8600 and S8660 models provide up to 1.0 A pilot and 1.0 A main valve current rating. S8610 and S8670 provide up to 1.0 A pilot and 2.0 A main valve current rating. Minimum ambient temperature rating is -40° F [-40° C]. Maximum ambient rating is +175° F [+79° C] for S8600, S8660 and for S8610, S8670 used with 1.0 A or less main valve. Maximum ambient rating for S8610, S8670 used with 1.0 to 2.0 A main valve is +165° F [+74° C]. See Table I for a summary of other differences between models.