Field Output Signals - Daikin Maverick II MPS062E Installation And Maintenance Manual

Field Output Signals

The following outputs may be available for field 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 Op selection can be selected by accessing the Unit
Setup menu in the Extended Menu section.
Fan Operation
The Fan Operation Output (MCB-DO10) supplies 24V(ac) to
terminal 116 on the field terminal block(TB2) when the output
is ON. To use this signal, wire the coil of a field supplied and
installed 24V(ac) pilot relay across terminals 116 and 117 on
TB2. When this output is on, 24V (ac) is supplied from the T3
control transformer through the output relay to energize the
field 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 airflow is detected. It is OFF
when the unit is OFF and airflow is not detected.
Figure 57: Field Output Schematic
IM 991-2 • MAVERICK II ROOFTOP
VAV BoxOutput
The VAV Box Output (MCB-DO10) supplies 24 V (ac) to
terminal 116 on the field terminal block (TB2) when the output
is ON. To use this signal, wire the coil of a field supplied and
installed 24V (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
field 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 airflow is detected. When airflow is
detected, it switches to the Heat (OFF) position.
60
Unit Options
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