7.2.1.1 Priority of Signals. 
A carbon monoxide alarm signal shall take precedence over supervisory or trouble signals.

7.2.1.2 Carbon Monoxide Alarm Signal Disposition.
   7.2.1.2.1 The actuation of a carbon monoxide detector or system shall be distinctively indicated as a carbon monoxide alarm signal.

   7.2.1.2.2* Servicing of a system in alarm that cannot be reset shall be in accordance with Chapter 8 and shall occur within 4 hours of the carbon monoxide alarm signal.

7.2.1.3 Carbon Monoxide Trouble Signal Disposition.
   7.2.1.3.1 Upon receipt of a carbon monoxide trouble signal, the responsible party(s) shall be notified.
   7.2.1.3.2 Servicing of a system in trouble shall be in accordance with Chapter 8 and shall occur within 4 hours of the trouble indication.