IM 893-10 • ROOFPAK SINGLEZONE UNITS 80 www.DaikinApplied.com
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Field Output Signals
The following outputs may be available for eld connections to
a suitable device.
VAV Box Signal/Fan Operation Signal
Digital Output #10 (MCB-DO10) may be selected as either the
Fan Operation output or the VAV output via the keypad. The
VAV/Fan Pop selection can be selected by accessing the Unit
Setup menu in the Extended Menu section.
Fan Operation
The Fan Operation Output (MCB-DO10) supplies 24 V (ac) to
terminal 116 on the eld terminal block (TB2) when the output
is on. To use this signal, wire the coil of a eld supplied and
installed 24 V (ac) pilot relay across terminals 116 and 117 on
TB2. When this output is on, 24 V (ac) is supplied from the T3
control transformer through the output relay to energize the
eld relay. Refer to the as-built wiring diagrams.
The Fan Operation output is ON when the unit is not Off and
when both the unit is OFF and airow is detected. It is off when
the unit is off and airow is not detected.
VAV Box Output
The VAV Box Output (MCB-DO10) supplies 24 V (ac) to
terminal 116 on the eld terminal block (TB2) when the output
is on. To use this signal, wire the coil of a eld supplied and
installed 24 V (ac) pilot relay across terminals 116 and 117 on
TB2. When this output is ON, 24 V (ac) is supplied from the
T3 control transformer through the output relay to energize the
eld relay. Refer to the as-built wiring diagrams.
In the Heating state, the VAV Output is turned off to indicate
that hot air instead of the normal cool air is being supplied to
the VAV boxes. The VAV boxes are driven to their Heating
Position when hot air is provided based on either the normally
open or normally closed contacts of the VAV output. The
VFD will continue to be controlled to maintain the desired
duct static pressure. This output is also OFF when the unit is
in the Startup or Recirculation states. If this output is in the
Heat (OFF) position when the unit enters the Fan Only state
or Minimum DAT Control state, the output remains off for an
adjustable Post Heat Time (while the unit VFDs are driven to
minimum speed) or until the VFD gets to its minimum speed if
the Post Heat Time is set greater than 0. The Post Heat Timer
can be adjusted via the keypad/display Timer Setting menu in
the Extended Menus.
During unoccupied operation, the VAV Box Output is in the
Cool (ON) position unless airow is detected. When airow is
detected, it switches to the Heat (OFF) position.
Figure 79: Field Output Schematic
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