www.DaikinApplied.com 25 OM 1280-2 • MICROTECH UNIT CONTROLLER
Special Purpose Unit Modes
There are some additional UVC modes that are considered
special purpose unit modes. These special purpose modes
include Pressurize, Depressurize, Purge, Shutdown, and
for short periods as needed.
In each of these special purpose UVC modes, if the space
temperature drops below EHS and the Emergency Heat
function is enabled, the UVC is forced into the Emergency
Heat mode (see “Emergency Heat Mode (Super State)”
on page 18) and then return, once the Emergency Heat
Table 8: Actions During Special Purpose Unit Modes
Action
Indoor air fan
(IAF)
Outdoor air damper
(OAD)
Exhaust fan
output
Pressurize High 100% Open
Depressurize Closed On
Purge High 100% Open On
Shutdown Closed
Auto Auto Auto
Pressurize Mode
When in Pressurize mode, the UVC uses the IAF, OAD, and
exhaust output as needed to pressurize the space. The UVC
stops all normal heating and cooling but does allow emergency
heat if required. The pressurize mode can only be accessed
via a network connection, through the LUI keypad, or with
ServiceTools software.
Depressurize Mode
When in Depressurize mode the UVC uses the IAF, OAD, and
exhaust output as needed to depressurize the space. The UVC
stops all normal heating and cooling but does allow emergency
heat if required. The depressurize mode can only be accessed
via a network connection or through the LUI keypad, or with
ServiceTools software.
Purge Mode
When in Purge mode, the UVC uses the IAF, OAD, and
exhaust output as needed to purge the space. The UVC stops
all normal heating and cooling but does allow emergency
heat if required. The purge mode can only be accessed
via a network connection through the LUI keypad, or with
ServiceTools software.
Shutdown Mode
WARNING
Shutdown mode and Energy Hold Off mode are a “stop” state for the unit
ventilator. It is not a “power off” state.
mode, the UVC stops all normal heating, cooling, ventilation (OA
damper is closed), and fan operation. By default emergency
heat is not be used during the shutdown mode, however,
shutdown mode. The shutdown mode can be accessed via a
network connection, a binary input to the UVC, through the LUI
keypad, or with ServiceTools software.
it forces the UVC to stop all mechanical heating and cooling.
force the UVC to cease mechanical heating and cooling when
mechanical heat is only allowed in the Emergency Heat mode.
connection, the LUI keypad or ServiceTools software.
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