QCA-FC403 Application Controller

COSYS Building Controls


Our COSYS Application and System Controls work along with our enterprise software platform OspreyFMS to provide a meaningful context.

The QCA-FC403 is a fully programmable, Native BACnet® Advanced Application Controller that communicates on a RS-485 LAN using the BACnet MS/TP protocol. Direct 240 VAC line voltage terminal connections are provided for 1, 2 or 3 speed fans. 


  • Native BACnet firmware
  • BACnet MS/TP communications
  • Standalone operation or on BACnet
  • Fully programmable in GCL+
  • Pre-loaded fan coil application database
  • Direct connection for up to 2 tri-state valve actuator
  • 3 relays rated for motor loads to control 1-, 2-, 3-speed fans, complete with interlocks and time delays for equipment protection
  • Slim design fits into narrow fan coil units
  • Firmware upgrade and database load/save over the networPower supplied by power mains
    (on-board 24 VAC transformer included)
  • Service port
  • LED indicator for each output, power, CPU and SCAN status


The QCA-FC403 is designed for fan coil control. The binary model, with 4 additional TRIAC outputs for heating and cooling, covers a wide range of fan coil unit applications, including 2- and 4-pipe fan coils.
TheQCA-FC403 allows for sequence modifications as required by the design engineer or building owner. It provides simple, easy-to-install fan coil control solutions for office buildings, hotels or residential buildings.


BACnet Device Profile
BACnet Advanced Application Controller (B-AAC)

2 Universal Inputs (10-bit) supporting:
0-5 VDC
0-10 VDC
10 kΩ Thermistor
1 10 kΩ or Dry Contact Input (10-bit)
4-20 mA

4 Binary TRIAC Outputs (24 VAC)
3 Binary Relay Outputs for fan speed control
240 VAC, 1HP (60 LRA/10 FLA)

Device Addressing
Set via DIP switches and jumpers, or software setup

Fixed screw-type terminal connectors (Class 1)
Removable screw-type connectors  (Class 2)

Wiring Class
NEC Class 1 (Power In)
NEC Class 2, SELV (Power Out)


Power In
240 VAC, 50/60 Hz @ 2000 VA max (30 VA for internal circuitry)

Power Out
24 VAC, 50/60 Hz @ 3 VA

1 MB (8 megabit) flash memory
127 KB SRAM memory for database

Communications Ports
RS-485 NET1
BACnet MS/TP up to 76800 bps, max 99 devices per BACnet MS/TP segment

RS-485 NET2
Delta LINKnet up to 76800 bps, max 4 devices on LINKnet, with no more than 2 devices per controller

32 to 113°F (0° to 45°C)
10 to 90% RH (non-condensing)

10.13 x 3.94 x 3.75 in.
(25.73 x 10.0 x 6.96 cm)

955 g (2.1 lb.)

CE-EMC Directive 89/336/EEC and IEC 61010-1
FCC Class B
ICES Class B


Order the QCA-FC403 fan coil controller according to the following product number:

QCA-FC403 Binary fan coil controller