Networkable Fan Coil Controller
Specification and Installation Instructions
www.neptronic.com
Page | 6
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.
ON
1
2
3
4
5
6
7
8
ON
1
2
3
4
DS2
DS1
Fuse 10A
F1
1
2
3
4
5
6
7
TFL24 and TDU
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 switch es
represent a binary logic to
calculate the M AC address .
Default = all OFF
1
2
Optional:
connect
to enable
service port
To other
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
J
P
1
T
O
3
/
4
INT EXT
PWR
STATUS
8
7
6
5
4
3
2
1
J
P
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
T
B
4
JP3
None
120 Ohms
COM
TO4
TO3
TI3 | TI4
COM
TO2
TI1 | TI2
TO1
COM
T
B
3
RET
RET
T
B
2
DO2 (3A)
6
5
4
3
2
1
4
3
2
1
DO1 (3A)
RET
FAN MED (7A)
FAN LOW (7A)
FAN HIGH (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
Power Input
(24 or 240Vac)
Applies to all relays and digital outputs
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 TB 11
STATUS
= Flashes when communicating with thermostat
LD3
= Flashes when transmitting (TX) via BACnet
LD4
= Flashes when receiving (RX) via BACnet
EFCB10TU4
24Vac (input)
With low voltage model (24Vac), TB11 is an
input that applies to left side of board and all
TRIAC outputs (independent of TB 4).
EFCB12TU4
24Vac (output )
With line voltage model (240Vac ), TB11
provides a 24Vac low voltage output .
Input
Output
3 digital inputs
(config.)
Override, flow switch , window /door
contact , dirty filter , overheat , selector
switch
External Temperature Sensor (10kOhms)
External Temperature Sensor
(0-10 Vdc or 2-10 Vdc)
Changeover Sensor
