OM 1280-2 • MICROTECH UNIT CONTROLLER 26 www.DaikinApplied.com
Unit Mode Priority
The UVC uses the network variables and binary inputs listed
in Table 9 and Table 10 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 columns. Certain inputs
will be ignored when another network variable or binary input
Table 9: Special Purpose UVC Unit Mode Priority
Emergency
override
input
1
Remote
shutdown
binary input
Energy
input
1
Priority result
Energy hold
2
Unit
mode
output
2
Actual UVC
action
Normal
3
De-
energized
4
Normal Normal
See the normal UVC
mode priority (Table 10)
Energy
Energy
Energized
5
Ignored
Energy
Pressurize Ignored Ignored Ignored Pressurize
De-
pressurize
Ignored Ignored Ignored De-pressurize
Purge Ignored Ignored Ignored Purge
Shutdown Ignored Ignored Ignored
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 10: Normal UVC Mode Priority
Application
override input
1
Unit mode override
input
1
Priority result
Unit mode output
2
Normal (Auto)
3
Normal (Auto)
3
Heat
Cool
Emergency heat
Fan Only
Heat Heat
Cool Cool
Night purge Night purge
Emergency heat Emergency heat
Fan only Fan only
Heat Ignored Heat
Cool Ignored Cool
Night purge Ignored Night purge
Ignored
Emergency heat Ignored Emergency heat
1. Network input.
2. Network output.
3. Normal (Auto) is the normal UVC power-up state.
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