Neptronic TRT2422 User manual

Rooftop Thermostat Controller
Specification and Installation Instructions
TRT2422-141202 Page | 1
Model
TRT2422
Description
The TRT2422 is a combination controller and thermostat with a
built-in scheduler, which is designed for simple and accurate
control of single or dual stage heating/cooling equipment, such as
rooftop and self-contained units. Its field configurable algorithms
enable versatile implementation of required control sequences.
Features
Precise temperature control with programmable PI (time
proportional control algorithm)
Configurable scheduler (7 days, 2/4 events)
24-hour backup battery for RTC (real-time clock)
2 external temperature sensor inputs
1 digital input
2 heat, 2 cool and 1 fan output
Automatic freeze protection
Anti-cycling protection
24Vac operation
Backlit LCD with simple icon and text driven menus
Multi level lockable access menu and setpoint
Selectable Fahrenheit or Celsius scale
Removable connectors
TRT2422
Applications
2 Heat / 2 Cool
Support single and two stage equipment
Technical Specifications
Power supply 22 to 26Vac 50/60Hz
Power consumption 1VA (excluding output loads)
Setpoint range 10ºC to 40ºC [50ºF to 104ºF]
Inputs - Two 10KΩType III inputs
- One digital contact (dry contact)
Outputs 5 dry contacts, 24Vac, 1A max, 3A in-rush
External sensor range -40ºC to 100ºC [-40ºF to 212ºF]
Control accuracy Temperature: ±0.4ºC [0.8ºF]
Proportional band 0.5ºC to 5ºC [1ºF to 10ºF] adjustable
Electrical connection 0.8 mm
2
[18 AWG] minimum
Operating temperature 0ºC to 50ºC [32ºF to 122ºF]
Storage temperature -30ºC to 50ºC [-22ºF to 122ºF]
Relative Humidity 5 to 95% non condensing
Degree of protection of housing IP 30 (EN 60529)
Weight 160 g. [0.36 lb]
Dimensions
A = 2.85” | 73mm
B = 4.85” | 123mm
C = 1.00” | 24mm
D = 2.36” | 60mm
E = 3.27” | 83mm
A
B
C
D
E
ºF / º C

Rooftop Thermostat Controller
Specification and Installation Instructions
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Terminal Identification
Terminal Description Specifications
C Common -
R24Vac 22 to 26Vac 50/60Hz
W1 Heating Stage 1 Dry contact, 24Vac, 1A max, 3A in-rush
W2 Heating Stage 2 Dry contact, 24Vac, 1A max, 3A in-rush
Y1 Cooling Stage 1 Dry contact, 24Vac, 1A max, 3A in-rush
Y2 Cooling Stage 2 Dry contact, 24Vac, 1A max, 3A in-rush
G Fan Dry contact, 24Vac, 1A max, 3A in-rush
DI Digital Input Dry contact (Filter, Service or Air Flow Switch)
TS External Control Temperature Sensor Input Thermistor 10KΩ, Type III. Cannot be used at the same time as the internal control
sensor. Select the sensor from the thermostat menu.
C Common -
DS Temperature Display Sensor Input Thermistor 10KΩ, Type III. This temperature input performs no control and will only
display the temperature.
PCB
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.
Jumpers Description
JP2 Thermostat Mode A&B = RUN: The thermostat function in Operation Mode (Default)
B&C = PGM: The thermostat is in Programming Mode
JP4 Universal Input (pin #16) A&B = Low Limit: Must be set to this position (Thermistor 10K Ω, Type III) (Default)
B&C = N/A: Not applicable
TB1
JP2
PGM RUN
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
JP4
24Vac
(R)
COM
(C)
W1
A
B
C
A
B
C
Temperature
Sensor
2
W2
Y1
Y2
G
COM
Ext Temp
Display Temp
DI
DI Digital Input (Input 13)
Filter: message only
Service: message only
Air Flow Switch: stops unit
External Control Temperature Sensor (Input 14)
WARNING! The external control sensor cannot be
used at the same time as the internal control sensor.
Select the sensor from the thermostat menu.
Temperature Display Sensor (Input 16)
This temperature input performs no control
and will only display the temperature.

Rooftop Thermostat Controller
Specification and Installation Instructions
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Mounting Instructions
CAUTION: Remove power to avoid a risk of malfunction.
A. Remove the captive screw that’s holding the base and the front cover of the unit together.
B. Lift the front cover of the unit to separate it from the base.
C. Pull all wires through the holes in the base.
D. Secure the base to the wall using wall anchors and screws (supplied). Make the appropriate connections.
E. Mount the control module on the base and secure using the screw.
Programming Mode
The Mode Selector DIP switch (DS1) must be set to the “ON” position (Programming Mode). Refer to wiring on page 2. To exit, set the
DIP switch back to the “OFF” position (Operation Mode). All changes will be saved.
Symbols used in this Manual
Temperature
Heating
Cooling
Fan
Schedule Mode
Timer/clock
W1 = Heating Stage 1
W2 = Heating Stage 2
Y1 = Cooling Stage 1
Y2 = Cooling Stage 2
User Control
1. “Inside Temp Sensor Offset”
Range:
Offset:
Increment:
10 to 40ºC [50 to 104ºF]
Max. ± 5ºC
0.1ºC [0.2ºF]
Compare the displayed temperature reading with a known value from a thermometer. To offset or calibrate the sensor, use the
arrows key to set the desired temperature reading. This is useful for thermostats installed in areas where the temperature read is
slightly different than the room’s actual temperature. For example, a thermostat placed right under the air diffuser. If the thermostat
is set to use an external temperature sensor (Step 28 on page 7), the thermostat displays “OFF”. The thermostat displays “---“ if
there an error with the sensor.
A
E
D
C
B
C
Icon indicates in “Programming Mode”
Setting description (e.g “inside temper sensor offset ”)
Setting value
Advance to next setting
Return to previous setting
Change value

Rooftop Thermostat Controller
Specification and Installation Instructions
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2. “Enable On Off Control Mode”
Default:
Range:
Yes (Enable)
Yes / No
If you select Yes, the user can set the unit to “Off” via the Control Mode (see page 16). If you select No, the “Off” selection does not
appear in the Control Mode.
Control Ramps and Timers
3. “Control Ramp Heating”
Default:
Range:
Increment:
2.0ºC [4ºF]
0.5 to 5.0ºC [1 to 10ºF]
0.5ºC [1ºF]
Select the desired proportional band value of the heating ramp. The heating symbol is also displayed.
4. “Control Ramp Cooling”
Default:
Range:
Increment:
2.0ºC [4ºF]
0.5 to 5.0ºC [1 to 10ºF]
0.5ºC [1ºF]
Select the desired proportional band value of the cooling ramp. The cooling symbol is also displayed.
5. “Control Dead Band Heating”
Default:
Range:
Increment:
0.3ºC [0.6ºF]
0 to 5.0ºC [0 to 10ºF]
0.1ºC [0.2ºF]
Select the desired dead band value of the heating ramp. The heating symbol is also displayed.
6. “Control Dead Band Cooling”
Default:
Range:
Increment:
0.3ºC [0.6ºF]
0 to 5.0ºC [0 to 10ºF]
0.1ºC [0.2ºF]
Select the desired dead band value of the cooling ramp. The cooling symbol is also displayed.
7. “Anti Cycle Time in Minutes”
Default:
Range:
Increment:
2 minutes
0 to 15 minutes
1 minute
To protect the compressor, set the delay in minutes before activating or reactivating the cooling contact.
8. “Heating Intgral Time in Seconds”
Default:
Range:
Increment:
0 seconds
0 to 250 seconds
5 seconds
Set the desired value for the heating integration factor compensation. The heating symbol is also displayed.
9. “Cooling Intgral Time in Seconds”
Default:
Range:
Increment:
0 seconds
0 to 250 seconds
5 seconds
Set the desired value for the cooling integration factor compensation. The cooling symbol is also displayed.

Rooftop Thermostat Controller
Specification and Installation Instructions
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W1 Output
10. “Select W1 Signal Ramp”
W1
Default:
Range:
Hr1 (Heating ramp 1)
Hr1, Hr2, OFF
Select the desired ramp for W2 output from the available options. Hr1: Heating Ramp 1; Hr2: Heating Ramp 2; or OFF: No signal.
11. “Select W1 Close Percent”
W1
Default:
Range:
Increment:
50% of demand
20% to 90%
5%
Select the percentage at which you want W1 to close (at % of demand of the ramp selected at Step 10). Contact automatically
opens at 0% of the demand.
12. “Select W1 open Percent”
W1
Default:
Range:
Increment:
20% of demand
0% to 80% (range is limited by the close value of step 11 minus 10%)
5%
Select the percentage at which you want W1 to open (at % of demand of the ramp selected at Step 10). Contact automatically
opens at 0% of the demand.
13. “Select W1 Direct Reverse”
W1
Default:
Range:
dir. (Direct)
dir. (Direct) or rEV. (Reverse)
Select the direction for the W1 output signal. Set dir. (Direct) for normally open or rEV. (Reverse) for normally closed.
W2 Output
14. “Select W2 Signal Ramp”
W2
Default:
Range:
Hr1 (Heating ramp 1)
Hr1, Hr2, OFF
Select the desired ramp for W2 output from the available options. Hr1: Heating Ramp 1; Hr2: Heating Ramp 2; or OFF: No signal.
15. “Select W2 Close Percent”
W2
Default:
Range:
Increment:
70% of demand
20% to 90%
5%
Select the percentage at which you want W2 to close (at % of demand of the ramp selected at Step 14). Contact automatically
opens at 0% of the demand.
16. “Select W2 open Percent”
W2
Default:
Range:
Increment:
40% of demand
0% to 80% (range is limited by the close value of step 15 minus 10%)
5%
Select the percentage at which you want W2 to open (at % of demand of the ramp selected at Step 14). Contact automatically
opens at 0% of the demand.

Rooftop Thermostat Controller
Specification and Installation Instructions
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17. “Select W2 Direct Reverse”
W2
Default:
Range:
dir. (Direct)
dir. (Direct) or rEV. (Reverse)
Select the direction for the W2 output signal. Set dir. (Direct) for normally open or rEV. (Reverse) for normally closed.
Y1 Output
18. “Select Y1 Signal Ramp”
Y1
Default:
Range:
Cr1 (Cooling ramp 1)
Cr1, Cr2, OFF
Select the desired ramp for Y1 output from the available options. Cr1: Cooling Ramp 1; Cr2: Cooling Ramp 2; or OFF: No signal.
19. “Select Y1 Close Percent”
Y1
Default:
Range:
Increment:
50% of demand
20% to 90%
5%
Select the percentage at which you want Y1 to close (at % of demand of the ramp selected at Step 18). Contact automatically
opens at 0% of the demand.
20. “Select Y1 open Percent”
Y1
Default:
Range:
Increment:
20% of demand
0% to 80% (range is limited by the close value of step 19 minus 10%)
5%
Select the percentage at which you want Y1 to open (at % of demand of the ramp selected at Step 18). Contact automatically
opens at 0% of the demand.
21. “Select Y1 Direct Reverse”
Y1
Default:
Range:
dir. (Direct)
dir. (Direct) or rEV. (Reverse)
Select the direction for the Y1 output signal. Set dir. (Direct) for normally open or rEV. (Reverse) for normally closed.
Y2 Output
22. “Select Y2 Signal Ramp”
Y2
Default:
Range:
Cr1 (Cooling ramp 1)
Cr1, Cr2, OFF
Select the desired ramp for Y2 output from the available options. Cr1: Cooling Ramp 1; Cr2: Cooling Ramp 2; or OFF: No signal.
23. “Select Y2 Close Percent”
Y2
Default:
Range:
Increment:
70% of demand
20% to 90%
5%
Select the percentage at which you want Y2 to close (at % of demand of the ramp selected at Step 22). Contact automatically
opens at 0% of the demand.

Rooftop Thermostat Controller
Specification and Installation Instructions
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24. “Select Y2 open Percent”
Y2
Default:
Range:
Increment:
40% of demand
0% to 80% (range is limited by the close value of step 23 minus 10%)
5%
Select the percentage at which you want Y2 to open (at % of demand of the ramp selected at Step 22). Contact automatically
opens at 0% of the demand.
25. “Select Y2 Direct Reverse”
Y2
Default:
Range:
dir. (Direct)
dir. (Direct) or rEV. (Reverse)
Select the direction for the Y2 output signal. Set dir. (Direct) for normally open or rEV. (Reverse) for normally closed.
Fan Settings
26. “Enable Fan Auto Mode”
Default:
Range:
Yes (Enable)
Yes / No
Select Yes to allow the user to adjust the Automatic mode. The fan symbol is also displayed.
If you selected No (disable), go to Step 28.
27. “Fan Auto Timeout Minutes”
Default:
Range:
Increment:
2 minutes
0 to 15 minutes
1 minute
Select the desired value for the automatic shutoff delay. The fan symbol is also displayed.
Temperature Sensor Settings
28. “Extern Sensor Temp”
Default:
Range:
OFF
OFF, t10.0 (external temperature sensor 10.0 KΩat input #14)
Select the temperature sensor that will be used by the thermostat, either the internal sensor (OFF) or external sensor (t10.0). The
unit does not support the use of both sensor simultaneously.
If you select OFF, the thermostat uses its internal temperature sensor.
If you select t10.0, the thermostat uses an external temperature sensor connected to input #14. Use a Type III 10kΩ
temperature sensor.
Do not connect an external temperature sensor to pin #14 if this option is set to OFF.
If you selected the OFF option, go to Step 30.
29. “Extern Sensor Temp Offset”
Display Displays temperature from input #14
If the option at step 28 is set to “t10.0”, the display shows the temperature read by the external temperature sensor at input #14.
Compare the displayed temperature reading with a known value from a thermometer. To offset or calibrate the sensor, use the
arrows key to set the desired temperature reading.
If the sensor is not connected or short circuited, “Eror" and the symbol are displayed.

Rooftop Thermostat Controller
Specification and Installation Instructions
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30. “Display Temp Sensor”
Default:
Range:
OFF
OFF, t10.0 (external temperature sensor 10.0 KΩat input #16)
In operation mode (page 15), the thermostat can display the temperature from another sensor connected to input #16. This sensor
is for display purposes only and performs no control functions..
If you select OFF, input #16 is ignored.
If you select t10.0, the thermostat can display temperature sensor connected to input #16. Use a Type III 10kΩ
temperature sensor.
31. “Display Temp Mode”
Default:
Range:
No
Yes / No
If set to “No”, in operation mode (page 15) the thermost displays the time on the first line. If set to “Yes”, in operation mode (page
15) the thermostat displays the temperature from input #16 on the first line. Also refer to step 30 above.
32. “Select DI Contact”
Default:
Range:
OFF
OFF, FILt, SEr, Airf
Select the input signal type for AI1 (analog input 1).
OFF: no signal
FILt: The input is used for a dirty filter contact. When activated, “Filter” and the symbol are displayed. All control modes
continue to function.
SEr: The input is used to notify that service is required. When activated, “Service” and the symbol are displayed. All
control modes continue to function.
Airf: The input is used to connect an air flow sensor. When activated, “Airflow” and the symbol are displayed. All
outputs will be turned off until the issue is corrected.
33. “Set DI Normal state”
Default:
Range:
NO (Normally Open)
NO (Normally Open), NC (Normally Close)
Seelct the desired normal state of input DI (input #13).
34. “Enable Anti freeze Protect”
Default:
Range:
No (disabled)
No, Yes
If this option is enabled, heating starts automatically when the temperature drops to 4ºC [39ºF], even if the thermostat is in OFF
mode. Once the temperature reaches 5ºC [41ºF], the heating stops.
Schedule Mode
This menu is accessible through normal operation mode.
1. The Thermostat Mode selector jumper (JP2) must be set to "RUN" position (Operation Mode). Refer to PCB on page 2.
2. Press and hold the button for 5 seconds, the symbol appears to indicate that you’re in Scheduling Mode.
3. Use the and arrow keys to increase or decrease the values.
4. Press the and buttons to navigate through the program functions.
The thermostat will return to normal mode if you navigate through the entire menu and do not make any selection, or if you do not press
any key for 5 minutes. The changed values will be saved automatically.

Rooftop Thermostat Controller
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Time and Date
1. “Set time display format”
Default:
Range:
Selecti.on:
24
12 hours, 24 hours
Desired time format
Select the desired time format.
2. “set hours”
Range:
Increment:
Selection:
00 to 23 hours
1 hour
Time in hours
Set the time in hours.
3. “set minutes”
Range:
Increment:
Selection:
00 to 59 minutes
1 minute
Time in minutes
Set the time in minutes.
4. “enter year”
Default:
Range:
Increment:
Selection:
2010
2010 to 2099
1
Year
Select the year.
5. “enter month”
Range:
Increment:
Selection:
01 to 12 (January to December)
1 month
Month
Select the month.
6. “enter day”
Range:
Increment:
Selection:
01 to 31 days
1 day
Day
Select the day.
Scheduling and Internal Setpoint
7. “used time schedul”
Default:
Range:
No
Yes, No
Select Yes, if you want to enable Scheduling Mode. Select No, to disable scheduling Mode.
If you selected No, go to Step 8.
If you selected Yes, go to Step 9.
8. “adjust intern setpnt”
Default:
Range:
Increment:
22ºC [72ºF]
10 to 40ºC [50 to 104ºF]
0.5ºC [1ºF]
Select desired setpoint.
Go to Step 29 on page 13.

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Specification and Installation Instructions
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9. “select 2 or 4 events per day”
Default:
Range:
2 Events
2 Events, 4 Events
Select the desired number of events per day. You can choose between 2 events or 4 events per day. This selection will be applied
for each day of the week.
If you selected 2, go to Step 10.
If you selected 4, go to Step 16.
Event 1 (2 Events/Day)
If the “2 events per day” option was selected at step 9.
10. “e1”
Default:
Range:
Increment:
Display:
6:00
From 00:00 to Monday Event 2 start time minus 15 minutes
15 minutes
MO, E1,
Set the start time for Event 1 on Monday. The Monday Event 1 temperature setting will be effective from the time that is set here
until the time set for the Event 2 on Monday.
11. “adjust event 1 cooling setpnt”
Default:
Range:
Increment:
Display:
22ºC [72ºF]
10 to 40ºC [50 to 104ºF], Off
0.5ºC [1ºF]
MO, ,
Select the desired cooling temperature setpoint for the duration of Event 1. The minimum value is restricted by the Event 1 heating
setpoint at step 12.
If you select the Off option, the thermostat will be off for Event 1 (go to Step 13).
12. “adjust event 1 heating setpnt”
Default:
Range:
Increment:
Display:
20ºC [68ºF]
10 to 40ºC [50 to 104ºF]
0.5ºC [1ºF]
MO, ,
Select the desired heating temperature setpoint for the duration of Event 1. The maximum value is restricted by the cooling setpoint
of Event 1 at step 11.
Event 2 (2 Events/Day)
If the “2 events per day” option was selected at step 9.
13. “e2”
Default:
Range:
Increment:
Display:
20:00
From Monday Event 1 start time +15 minutes to 23:45
15 minutes
MO, E2,
Set the start time for Event 2 on Monday. The Monday Event 2 temperature setting will be effective from the time that is set here
until the time set for the Event 1 on Tuesday.