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Delta Controls
Output Configuration
Triac Outputs
DFC outputs switch INTERNALLY sourced 24VAC only.
They cannot switch an external 24Vac power source.
The triac outputs are intended to drive a 24VAC tri-state or
two-position valve actuator.
In the default FCU database, OP1 and OP2 are used to
position a tri state heating valve actuator, and OP3 and
OP4 are used for a tri state cooling valve actuator.
Fan Speed Relay Operation
The relay interlock circuitry only allows the highest speed select terminal to be energized. Speed I and II relays
are disconnected by the hardware interlock circuitry when Speed III relay is active. The hardware interlock
operates when two or more outputs are on, then the highest speed select terminal is energized.
The DFC controller hardware does not allow more than one fan relay to be energized at the same time. The
default database will switch the fan speeds without any programmed time delay. Should this controller be used
with FCU equipment that requires delays when switching the fan speeds, the database must be modified to suit.
It is recommended that the Speed III terminal be used for single speed fan applications; use
Speed II and III terminals for two speed fan applications.
Database Backup
A Super capacitor is used for SRAM database backup. This device does not require maintenance or
replacement during the lifetime of the product. While the product is powered up, the Super capacitor is
automatically charged. After 48 hours of charging time, the Super capacitor has 100% backup time capacity.
There is a possibility of data loss if the Super capacitor charging time is too brief.
Network Communications Setup
The controller communicates on a BACnet MS/TP network at a default speed of 76,800 bps. Refer to the
ORCAview Technical Reference Manual for further detail on configuring the BACnet MS/TP network or
changing baud rates, etc.
Indicators
LED
Function
Outputs
Output Status
(OP1 – OP7)
Indicators
Scan
CPU Scan Indicator
Page 6 of 8
Description
This green LED is on or off to match the binary status of the
associated output, or on with increasing intensity for analog
outputs.
This red LED flashes at a rate relative to the CPU scan rate.
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