Instruction manual

www.DaikinApplied.com 15 OM 751-4
desCrIptIon of operatIon
Table 8: UVC state names and numbers
Normal UVC modes State names
State numbers
Decimal ASCII Hex
OFF OFF 9 9 57
Night purge Night Purge 8 8 56
Fan only Fan Only 10 A 65
Emergency heat See Note 1
Auto
Heat See Note 1
Cool
EconMech 1 1 49
Mech 2 2 50
Econ 3 3 51
Cant Cool 12 C 67
Note: 1. Auxiliary heat only, if available.
WARNING
Off mode is a “stop” state for the unit ventilator. It is not a “power off” state. Power may still be provided
to the unit.
OFF Mode (State 9)
Off mode is provided so that the UVC can be forced into a powered OFF condition.
OFF mode is a “stop” state for the unit ventilator; it is not a power off state. OFF mode
consists of a single UVC state: OFF [9].
When OFF mode becomes active, the UVC stops all normal heating, cooling, and ven-
tilation (OA damper is closed), and fan operation ends. The UVC continues to monitor
space conditions, indicate faults, and provide network communications (if connected to
a network) in the OFF mode while power is maintained to the unit.
While in OFF mode, the UVC does not maintain DA temperatures. If the space temper-
ature drops below EHS while in the OFF mode, the UVC is forced into the Emergency
Heat mode (see "Emergency Heat Mode (Super State)" on page 17).
The space lighting output continues to operate based upon the current occupancy
mode.
Note: Special purpose unit modes such as Purge, Pressurize, and De-pressurize can force the
UVC to perform “special” functions during which the display appears to be in the OFF
mode.
Figure 7: Off state diagram
OFF
Mode
(State 9)
Is SpaceTemp
< EHS
No
EMERGENCY
HEAT
Mode
Yes
Enter from:
LUI Input
Network Input