Daikin MicroTech II, Operation And Maintenance Manual

Page: 16 / 44

OM 752-4 16 www.DaikinApplied.com
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Night Purge Mode (State 8)
Night Purge mode is provided as a means to more easily and quickly ventilate a space.
Night purge can be useful in helping to remove odor build up at the end of each day,
or after cleaning, painting, or other odor generating operations occur within the space.
Night Purge mode consists of a single UVC state: Night Purge [8].
Night Purge is a full ventilation with exhaust mode, during which room comfort is likely
to be compromised. Therefore, Daikin strongly recommends using Night Purge only
when the space is unoccupied.
When Night Purge mode becomes active, the UVC stops all normal heating and cool-
ing. Since any new energy used to treat the incoming air would be wasted in the purge
process. In the Night Purge mode, the space fan is set to high speed, the OA damper
is set to 100% open, and the Exhaust Fan binary output (see "External Binary Outputs"
on page 36 ) is set to ON. If the UVC is not set to another mode within 1 hour (fixed),
the UVC automatically switches to the Fan Only mode (see "Fan Only Mode (State 10)"
below).
While in Purge mode, the UVC does not maintain DA temperatures. If the space tem-
perature drops below the EHS, the UVC is forced into the Emergency Heat mode (see
"Emergency Heat Mode (Super State)" on page 17 ).
Figure 8: Night purge state diagram
NIGHT PURGE
Mode
(State 8)
Run Time < 1
Hour
Yes
FAN ONLY
Mode
(State 10)
No
Enter from:
Network Input
Fan Only Mode (State 10)
The Fan Only mode is provided so that the UVC can be forced into a Fan Only opera-
tion via a keypad/display or a network connection. Fan Only mode consists of a single
UVC state: Fan Only [10].
When Fan Only mode becomes active, the UVC stops all normal heating and cooling.
While in Fan Only mode, the UVC does not maintain DA temperatures. If the space
temperature drops below the EHS, the UVC is forced into the Emergency Heat mode
(see "Emergency Heat Mode (Super State)" on page 17 ).
Figure 9: Fan only state diagram
FAN ONLY
Mode
(State 10)
Is SpaceTemp
< EHS
No
EMERGENCY
HEAT
Mode
Yes
Enter from:
LUI Input
Network Input