Networkable VAV 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.
DS1 DIP Switch
The 8 DIP switches represent a
binary logic to calculate the MAC
address. Default = all OFF
Avoid using addresses above 246
for Modbus
JP3
(End of line)
None = No end of line
120
Ω = Last node on network
TXD
Flash = transmitting data
via network
TB
1
TB
3
TB
2
TB
4
TB
5
TB
6
Po
w
e
r
Sta
tu
s
ON
1
2
3
4
5
6
7
8
DS
1
INT
E
X
T
TB
7
JP
2
INT
E
X
T
JP
1
Room Module (TRL54)
Optional:
connect
to enable
service port
3
2
1
AI2
AI1
COM
2 analog inputs
(config.)
External temp, changeover, normally cool/
heat, setpoint air flow, CO2, air supply temp
3
2
1
AO2
AO1
COM
2 analog outputs
(config.)
Cool ramp 1 or 2, heat ramp 1 or 2, CO2,
setpoint airflow
3
2
1
DI2
DI1
COM
2 digital inputs
(config.)
DI2: Override, normally cool/heat
DI1: OCC open/close, NSB open/close
3
2
1
COM
24Vac input
(TO2/TO1)
TO1
4
TO2
7
6
5
COM
24Vac input
(TO3/TO4)
TO3
8
TO4
4 TRIAC outputs
(config.)
Cool 1 or 2, heat 1 or 2, CO2
On/Off (config close/open percent)
Floating (config float time)
Pulse (heat only)
Direct or reverse
3
2
1
24Vac
COM
4
24Vac
COM
Power Input/Output
24Vac
3
2
1
Data
COM
Pwr
3
2
1
COM
A+ (in)
B- (in)
5
4
A+ (out)
B- (out)
To other
BACnet
devices
Mode Selector Jumper
RUN = Operation Mode
PGM = Programming Mode
High Total Pressure
Low Static Pressure
T
XD
R
XD
JP
3
E
OL
JP2
(TO3 / TO4 input voltage)
INT = 24Vac supplied internally by TB1
EXT = Apply 24Vac to pin 5 of TB2
JP1
(TO1 / TO2 input voltage)
INT = 24Vac supplied internally by TB1
EXT = Apply 24Vac to pin 1 of TB2
RXD
Flash= receiving via data
network
Power
On = 24Vac applied to
TB1
Status
Flash = communicating
with thermostat
TB1
COM
24V
COMM. BUS
A+
B-
JP1
RUN
PGM
Temperature
Sensor
BACnet
service port
Maximum
50ft (15m)
