Honeywell Farenhyt IFP-2000 Manual page 249

Operation
Select all non-activated output groups for
microphone override
Figure 1-2: Gain ECS Control as ECS Super User Screen
P/N LS10049-001SK-E Rev B
Table 1-2: ECS Control Request
Key the microphone, wait for the Ready-to-Talk LED to light, press the
Non-Active Call Key, and then deliver your verbal message.
Task
ECN: 13-0759