Horstmann, Controller, models:

CentaurPlus C11	Installation Instructions
CentaurPlus C27	User Operating Instructions Manual
ChannelPlus H21XL	User Instructions
ChannelPlus H27XL Series 2	User Operating Instructions Manual
ChannelPlus H27ZXL Series 2	User Operating Instructions Manual
ChannelPlus H37VXL Series 2	User Operating Instructions Manual
Electronic 7	User Instructions