Xylem, Boiler Supplies, models:

McDonnell & Miller 247 Series	Instruction Manual
McDonnell & Miller 47 Series	Instruction Manual
McDonnell & Miller 51 Series	Instruction Manual
McDonnell & Miller 67 Series	Instruction Manual
McDonnell & Miller GuardDog 751P Series	Instruction Manual
McDonnell and Miller PS-800 Series	Instruction Manual