Unit Mode Priority - Daikin MicroTech II Operation And Maintenance Manual

www.DaikinApplied.com

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 prior-
ity 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 specific input value.
Table 10: Special purpose UVC unit mode priority
Remote shut-
Emergency
down binary
override input 1
input
De-energized 4
Normal 3
Energized 5
Pressurize Ignored
De-pressurize Ignored
Purge Ignored
Shutdown 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 11: Normal UVC mode priority
Application override input 1
Normal (Auto) 3
Heat
Cool
Night purge
Off
Emergency heat
Fan only
1. Network input.
2. Network output.
3. Normal (Auto) is the normal UVC power-up state.
Energy hold off Energy hold off
input 1 output 2
Normal Normal
Energy hold off Energy hold off
Ignored Energy hold off
Ignored Ignored
Ignored Ignored
Ignored Ignored
Ignored Ignored
Unit mode override input 1
Normal (Auto) 3
Heat
Cool
Night purge
Off
Emergency heat
Fan only
Ignored
Ignored
Ignored
Ignored
Ignored
Ignored
23
d o
esCrIptIon of peratIon
Priority result
Unit mode Actual UVC
output 2
action
See the normal UVC mode priority
(Table 11)
Off Off
Off Off
Off Pressurize
Off De-pressurize
Off Purge
Off Off
Priority result
Unit mode output 2
Heat
Cool
Emergency heat
Heat
Cool
Night purge
Off
Emergency heat
Fan only
Heat
Cool
Night purge
Off
Emergency heat
Fan only
OM 752-4