Networkable Fan Coil Controller
Specification and Installation Instructions
www.neptronic.com
Page | 9
Wiring
We strongly recommend that all Neptronic products be wired to a separate grounded transformer and that transformer shall service
only Neptronic products. This precaution will prevent interference with, and/or possible damage to incompatible equipment.
For 120/240Vac models, it is recommended to have separate power sources for the EFCB controller and the Fan Coil Unit, in order
to protect the device circuitry from any surge in power supply.
ON
1
2 3
4
5
6
7
8
ON
1
2 3
4
DS2
DS1
Fuse 10A
F1
TB1
1
2
3
4
5
6
7
TFL24 and TDF
1
2
3
24Vac
COM
COM BUS
IN B-
IN A+
COM
3
DS1 DIP Switch
1 = AI3
2 = AI4
3 = AI5
4 = AI6
Off: Temp. sensor (10k ohms)
On: Voltage (0-10Vdc)
DS2 DIP Switch
The 8 DIP switches
represent a binary logic to
calculate the MAC address.
Default = all OFF
1
2
Optional:
connect
to enable
service port
To ot her
BACnet
device
COM
24Vac
DI1
1
DI2
2
COM
3
DI3
4
DI4
5
AI3
1
AI4
2
COM
3
AI5
4
AI6
5
AI1
1
COM
2
AI2
3
COM
3
AO3
4
AO4
JP
1
T
O
3
/
4
INT EXT
PWR
STATUS
8
7
6
5
4
3
2
1
JP
2
T
O
1
/
2
IN
T
E
X
T
RET
Line
RET
TB7
TB8
TB9
TB10
TB11
AO1
1
AO2
2
1
2
5
TB6
TB5
T
B
1
TB
4
JP3
None
120 Ohms
COM
TO4
TO3
TI3 | TI4
COM
TO2
TI1 | TI2
TO1
COM
T
B
3
RET
RET
TB
2
DO2 (3A)
6
5
4
3
2
1
4
3
2
1
DO1 (3A)
RET
FAN MED (7A)
FAN LOW (7A)
FAN HI GH (7A)
DO3 (3A)
4 analog outputs
(config.)
Cool, heat, reheat, changeover, fan,
humidify & dehumidify by cooling
0-10Vdc (configurable min/max)
Direct or reverse
4 analog inputs
(config.)
0-10Vdc or 10kOhms
via DIP switch
NSB or OCC Sensor
0
3-speed fan
4
3
2
1
RET
DO4 (3A)
4 digital outputs
(config.)
Cool, heat, reheat, changeover,
humidify & dehumidify by cooling.
Configurable close/open percent
Direct or reverse
LD3 = TX
LD4 = RX
4 TRIAC outputs
(config.)
Cool, heat, reheat, & changeover
On/Off (config close/open percent)
Floating (config float time)
Pulse (heat and reheat only)
Direct or reverse
JP2 TO1 /2
(Input Voltage)
INT = 24Vac supplied internally from TB11
EXT = Apply 24Vac to pin 1 of TB1
JP1 TO3 /4
(Input Voltage)
INT = 24Vac supplied internally from TB11
EXT = Apply 24Vac to pin 5 of TB1
JP3
(End of line)
None = No end of line
120
Ω = Last node on network
LEDs
POWER
= On when 24Vac applied to TB11
STATUS
= Flashes when communicating with digital room
sensor
LD3
= Flashes when transmitting (TX) via BACnet
LD4
= Flashes when receiving (RX) via BACnet
Input
Output
3 digital inputs
(config.)
Override, flow switch, window/door
contact, dirty filter, overheat
EFCB10TUx
24Vac (input)
With low voltage model, 24Vac must be
applied to TB11 in order to supply the left
side of board and all TRIAC outputs on TB1.
EFCB11TUx/EFCB12TUx
24Vac (output)
With line voltage models (120 Vac/240Vac),
TB11 provides a 24Vac low voltage output.
Power Input
(24, 120, or 240Vac)
Applies to all relays and digital outputs
If 120Vac or 240Vac, TB11 = Out
If 24Vac, TB11 = In
Ext ernal Tem pe rature Sensor (10kO hm s)
Cha ngeover Sensor
Ext ernal Tem pe rature Sensor
(0-10 Vdc or 2-10 Vdc)
