Neptronic TRT2422 Specification And Installation Instructions

Rooftop thermostat controller

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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
Technical Specifications
Power supply
Power consumption
Setpoint range
Inputs
Outputs
External sensor range
Control accuracy
Proportional band
Electrical connection
Operating temperature
Storage temperature
Relative Humidity
Degree of protection of housing
Weight
Dimensions
A = 2.85" | 73mm
B = 4.85" | 123mm
C = 1.00" | 24mm
D = 2.36" | 60mm
E = 3.27" | 83mm
TRT2422-141202
Applications
22 to 26Vac 50/60Hz
1VA (excluding output loads)
10ºC to 40ºC [50ºF to 104ºF]
- Two 10KΩ Type III inputs
- One digital contact (dry contact)
5 dry contacts, 24Vac, 1A max, 3A in-rush
-40ºC to 100ºC [-40ºF to 212ºF]
Temperature: ±0.4ºC [0.8ºF]
0.5ºC to 5ºC [1ºF to 10ºF] adjustable
2
0.8 mm
[18 AWG] minimum
0ºC to 50ºC [32ºF to 122ºF]
-30ºC to 50ºC [-22ºF to 122ºF]
5 to 95% non condensing
IP 30 (EN 60529)
160 g. [0.36 lb]
B
E
D
ºF / º C
A
C
Rooftop Thermostat Controller
Specification and Installation Instructions
TRT2422
2 Heat / 2 Cool
Support single and two stage equipment
Page | 1

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Summary of Contents for Neptronic TRT2422

  • 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.
  • Page 2: Terminal Identification

    Temperature Display Sensor Input display the temperature. 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.
  • Page 3: Mounting Instructions

    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. www.neptronic.com Page | 3...
  • Page 4 “Cooling Intgral Time in Seconds” Default: 0 seconds Range: 0 to 250 seconds Increment: 5 seconds Set the desired value for the cooling integration factor compensation. The cooling symbol is also displayed. www.neptronic.com Page | 4...
  • Page 5 0% to 80% (range is limited by the close value of step 15 minus 10%) Increment: 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. www.neptronic.com Page | 5...
  • Page 6 70% of demand Range: 20% to 90% Increment: 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. www.neptronic.com Page | 6...
  • Page 7: Fan Settings

    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. www.neptronic.com Page | 7...
  • Page 8: Schedule Mode

    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. www.neptronic.com Page | 8...
  • Page 9: Time And Date

    If you selected No, go to Step 8. If you selected Yes, go to Step 9. “adjust intern setpnt” Default: 22ºC [72ºF] Range: 10 to 40ºC [50 to 104ºF] Increment: 0.5ºC [1ºF] Select desired setpoint. Go to Step 29 on page 13. www.neptronic.com Page | 9...
  • Page 10 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. www.neptronic.com Page | 10...
  • Page 11 [50 to 104ºF] Increment: 0.5ºC [1ºF] Display: MO, E1, 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 17. www.neptronic.com Page | 11...
  • Page 12 [50 to 104ºF] Increment: 0.5ºC [1ºF] Display: MO, E3, Select the desired heating temperature setpoint for the duration of Event 3. The maximum value is restricted by the cooling setpoint of Event 3 at step 23. www.neptronic.com Page | 12...
  • Page 13: Copy Schedule

    Default: Auto (Automatic) Range: Auto (Automatic), Heat (Heating Only), Cool (Cooling Only), On (Cooling or Heating), Select the control mode that you want to authorize to the user. To authorize all the available modes, select Auto. www.neptronic.com Page | 13...
  • Page 14 "quit” Default: Yes (Quit) Range: Yes, No Select Yes to exit Scheduling Mode and return to Operation Mode. Select No to continue configuring the schedules. Go to step 1 on page 9. www.neptronic.com Page | 14...
  • Page 15: Operation Mode

    The setpoint appears for 5 seconds. To adjust the setpoint, press the arrow keys while the temperature is displayed. If the setpoint adjustment has been locked (Step 29 on page 13), the lock symbol appears. www.neptronic.com Page | 15...
  • Page 16: Fan Mode

    Step 29 on page 13. If the setpoint is locked, a locked” message appear. Recycling at end of life: please return this product to your Neptronic local distributor for recycling. If you need to find the nearest Neptronic authorized distributor, please consult www.neptronic.com.

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