Instruction manual

OM 751-4 22 www.DaikinApplied.com
desCrIptIon of operatIon
Unit Mode Priority
The UVC uses the network variables and binary inputs listed in Table 10 and Table
11 to determine the current unit mode. Special purpose UVC unit modes have higher
priority than the normal UVC unit modes as shown in the tables.
Each table lists the highest priority items on the left to the lower priority items to the
right. The right-most columns indicate unit operation as a result of the left-most col-
umns. Certain inputs will be ignored when another network variable or binary input with
a higher priority has a specic input value.
Table 10: Special purpose UVC unit mode priority
Priority result
Emergency
override input
1
Remote shut-
down binary
input
Energy hold off
input
1
Energy hold off
output
2
Unit mode
output
2
Actual UVC
action
Normal
3
De-energized
4
Normal Normal
See the normal UVC mode priority
(Table 11)
Energy hold off Energy hold off Off Off
Energized
5
Ignored Energy hold off Off Off
Pressurize Ignored Ignored Ignored Off Pressurize
De-pressurize Ignored Ignored Ignored Off De-pressurize
Purge Ignored Ignored Ignored Off Purge
Shutdown Ignored Ignored Ignored Off Off
1. Network input.
2. Network output.
3. Normal indicates the UVC power-up condition.
4. De-energized indicates that the contacts connected to this binary input are open.
5. Energized indicates that the contacts connected to this binary input are closed.
Table 11: Normal UVC mode priority
Priority result
Application override input
1
Unit mode override input
1
Unit mode output
2
Normal (Auto)
3
Normal (Auto)
3
Heat
Cool
Emergency heat
Heat Heat
Cool Cool
Night purge Night purge
Off Off
Emergency heat Emergency heat
Fan only Fan only
Heat Ignored Heat
Cool Ignored Cool
Night purge Ignored Night purge
Off Ignored Off
Emergency heat Ignored Emergency heat
Fan only Ignored Fan only
1. Network input.
2. Network output.
3. Normal (Auto) is the normal UVC power-up state.