Daikin DPS - Determining Unit Status; Determining Control Mode

Determining Unit Status
Unit Status is a status only item which indicates whether or not
the unit is enabled and if not why.
Enabled
Unit operation has not been disabled for any of the following
reasons.
Off Manual
The unit operating state is off and the unit status is OffMan
when the control mode is set to off via the keypad. The control
mode can only be changed via the System menu on the
keypad/display.
OffManCtrl
The unit operating state is off and the unit status is OffManCtl
when the controller is set to manual control via the Manual
Control menu.
Off Network
The unit operating state is off and the unit status is OffNet
when the control mode is set to Auto via the System menu and
the network Net App Mode is set to off.
Off Alarm
The unit operating state is off and the unit status is OffAlm
when an active alarm of the “fault” type has the unit shutdown.
Off Fan Retry
The unit operating state is off and the unit status is OffFnRty
when The fan retry conditions below indicate that the unit
should be shutdown and restarted after airow is lost.
• The supply fan is congured for variable volume
• The airow switch (PC7) is open AND the duct static
pressure is less than ½ the duct static pressure set point
There are no active faults that would shut down the unit
Determining Control Mode
The unit cooling and heating can be set up for automatic
heat/cool, cool only, heat only, fan only, or network cool/heat
operation by setting the Control Mode. The unit can also be
manually disabled via the Control Mode. The following are
descriptions of the six available Control Mode selections.
Off
When the Control Mode is set to “Off,” the Unit Status is “Off
Man” and the unit is completely disabled.
Heat Only
When the Control Mode is set to “Heat Only,” heating operation
is allowed to operate to maintain the heating set points.
Cooling operation is disabled (Cooing Status is “Off Man”).
Cool Only
When the Control Mode is set to “Cool Only,” cooling operation
is allowed to operate to maintain the cooling set points. Heating
operation is disabled (Heating Status is “Off Man”).
Fan Only
When the Control Mode is set to “Fan Only,” the fans are
allowed to operate but cooling and heating operation is
disabled (Cooling Status and Heating Status are “Off Man”).
Heat Cool
When the Control Mode is set to “Heat/Cool,” both cooling
and heating operation are allowed to operate as required to
maintain the cooling and heating set points.
Auto
When the Control Mode is set to “Auto,” the heat/cool, cool
only, heat only, and fan only decision is determined by the
network application mode parameter, which is set via a network
signal as described below. The NetApp Mode parameter has
no effect on unit operation unless the Control Mode is set to
“Auto.”
operator’s guIde
www.DaikinApplied.com 91 OM 1141-3 • MICROTECH UNIT CONTROLLER