LCN closer type

RELATED FAQS

Question
Answer
The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
The 1521 is simply a re-numbered 4031 closer. They are the same unit.
All LCN closers have UL listings, and are Fire Rated for up to 3 hours.
Closers mounted according to LCN installation instructions require no periodic maintenance or seasonal adjustments.The full line catalog states that no periodic maintenance is required.