Networkable VAV Controller
Specification and Installation Instructions
www.neptronic.com EVCB Standard Page | 7
PCB Drawings
TRL24 Thermostat
3 wire cable (TB1 #1, 2 & 3)
Connect TB1 #6 (A+) & #7 (B-) to EVCB to enable the BACnet service port.
Mode Selection (JP1)
RUN:
Thermostat is in Operation Mode
.
Thermostat must be set in this mode for
normal system operation. If not locked,
setpoint and control mode can be changed
by the end user.
PGM:
Thermostat is set in Programming Mode
.
Refer to the following sections for more
details.
TDU Thermostat
3 wire cable (TB1 #1, 2 & 3)
Connect TB1 #6 (A+) & #7 (B-) to EVCB to enable the BACnet service port.
Mode Selection (JP1)
RUN:
Thermostat is in Operation Mode
.
Thermostat must be set in this mode for
normal system operation. If not locked,
setpoint and control mode can be changed
by the end user.
PGM:
Thermostat is set in Programming Mode
.
Refer to the following sections for more
details.
Access to Menus
The menu overviews and options are the same for both TRL24 and TDU thermostats. However, the action button or the button
used to access the menus and save changes is different in the thermostats. Use the following menu overviews with the appropriate
action button as per your thermostat.
Action Buttons on Thermostat
Action Button
Task
TRL24 TDU
Press to access the programming menus and save any changes.
Press to return to the previous step without saving.
Mode Selector Jumper
RUN = Operation Mode
PGM = Programming Mode
BACnet
service port
Avoid touching the CO2
sensor as this may cause
incorrect readings
TB1
1
2
3
4
5
6
7
PGM RUN
A
B
C
JP1
Optional: connect
to BACnet network to
enable service port
CO
2
sensor
(TRLG24 and TRLGH24 only)
A+
DATA
PWR
COM
B-
Connect to VAV
controller
Temperature sensor (all models)
Humidity sensor (TRLH24 and TRLGH24 only)
PGM
RUN
JP1
PGM
RUN
JP1
Mode Selector Jumper
RUN = Operation Mode
PGM = Programming Mode
BACnet
service port
JP1
PGMRUN
TB1
Optional: connect
to BACnet network to
enable service port
A+
DATA
PWR
COM
B-
Connect to EVCB
1234567
CO
2
sensor
Avoid touching the CO2
sensor as this may cause
incorrect readings
Thermostat Display Universal (TDU)
Temperature sensor (all models)
Humidity sensors (models with humidity)
PGM
RUN
JP1
PGM
RUN
JP1
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