Trane BAS-APG001-EN Manuel D’Utilisation

In general, the BCU cannot pass information faster than every 5 seconds. 
This is the fastest a CPL routine can run. A BCU is included to collect 
system events, such as communication failure, and allow a user a remote 
connection to the system for status.

(UL 864: 49.10)

The following descending order of priority shall be followed in processing 
smoke-control commands:

1.

Manual activation and deactivation commands issued at the FSCS.

2.

Manual activation and deactivation commands at other than the 
FSCS.

3.

Initial automatically actuated smoke-control sequence. The system 
does not need to override any manual activation or de-activation 
functions in place prior to the automatic control sequence.

4.

All other manual or automatic operation used for normal building 
operation.

For programming purposes, the priority list in descending order is:

1.

Any manual control of dampers, fans, and smoke control panel 
control.

2.

Automatic smoke control system reaction.

3.

System test processes such as normal HVAC control, lamp tests, or 
system self-tests. 

All of the above priorities refer to performance, not annunciation. For 
instance, if a lamp test is running and a user overrides one of the 
dampers, the annunciation (LED) may not change while the actuator 
moves.   In this case, the lamp test is not affecting system performance, 
just annunciation.   However, if a system self-test is running, either a 
smoke alarm trigger or manual override will end the self-test.   More 
detail is shown in Table 28 on page 101.