The TS250 is a commercial grade temperature thermostat with a built in CO2 sensor. The TS250 is designed for familiarity, simplicity, and intuitiveness. With Online temperature and air quality management, configuration, and scheduling - you take control of comfort and efficiency in all your building's spaces. Start reducing energy use, managing air quality, and increasing comfort throughout your facility today!

Internet Programmable Thermostat with

CO2 (TS250)

Temperature and Carbon-Dioxide





Air quality and temperature in one.

Comfort does not always just include space temperature, but also air quality. The Pelican TS250 delivers a single thermostat with fully integrated, web-enabled temperature and CO2 monitoring and control. From a single computer screen, you can now see exactly how your building environments are running. You can now guarantee your customers and employees are breathing clean air.

Limited Wire Friendly

Pelican delivered an industry changing solution when it introduced a simple way to deal with limited thermostat wire. With only three wires, the Pelican TS250 can control up to 2H/2C Conventional or 3H/2C Heat Pump HVAC units with complete demand ventilation. Never pay for unnecessary wires to be run or for extra equipment. Pelican can save you time with their retrofit friendly products.




Automated Wireless Connection

Because we integrate our advanced wireless mesh network into every thermostat, there is ZERO wireless setup required. No passwords to enter or complex connection processes to go through. Thermostats automatically connect to each other and back to the Pelican Gateway (GW400). Easy plug and play technology with no WiFi interference or requirement.


The Wiring Module (WM500) 

The WM500 comes with every Pelican TS250 purchase. Installation is simple with limited wiring between the HVAC unit and thermostat. Simply remove the WM500, install it inside the HVAC unit, and use the (3) standard unshielded wires to connect it to the TS250.



Online Management


The TS250 automatically connects wirelessly to a Pelican Wireless Gateway (GW400) installed at the customer's site. This gives you the ability to manage all configuration, scheduling, and system operation right from your smartphone, tablet, or PC. Complete control at your fingertips no matter where you are.

Alarm Notifications


Every TS250 monitors its own space temperature and humidity levels in real-time. Using advanced diagnostic and reporting capabilities, the TS250 notifies you when your HVAC system fails. Now you can quickly determine the issue and resolve the problem.

Air Quality Control


With real-time CO2 monitoring, the TS250 provides true space air quality management. The TS250 can energize the Fan for demand ventilation and building safety. C02 levels are graphed and displayed virtually on the Pelican Web App.


Easy Installation


The TS250 installs in the same way as any stand-alone programmable thermostat. It connects to the HVAC unit using standard thermostat wire. But, Pelican went one step further. The TS250 only requires (3) wires to connect to the HVAC unit for up to 2H/2C Conventional, 3H/2C Heat Pump, and/or Humidification and Dehumidification management. Now you will never have to pull wire to install the Pelican thermostat.


Energy Efficiency


Connected to the Internet gives you real-time information based on exactly how every thermostat is operating in your building. You can create schedules for managing each space or create Group Schedules for sharing between multiple thermostats. With real control right at your fingertips, saving money and increasing comfort is now a simple and efficient.


Historical Trend Data


Every TS250 tracks trend data in real-time so you can visually see exactly how your spaces are operating at any moment of the day. This data is accessible Online for up to 2 years for every thermostat. The TS250 also tracks Usage Data, so you can now see how much energy is allocated to just your HVAC vs. other building electrical loads.


Hardwire: 24VAC, 60Hz; 50mA

Voltage Rating: 23 - 30VAC

Relay Current: 1.0A running





Conventional Unit 

R: 24VAC

C: Neutral

Rc: 2nd 24VAC Transformer

Y: 1st Stage Cool

W: 1st Stage Heat

Y2: 2nd Stage Cool

W2: 2nd Stage Heat

G: Fan

Heat Pump Unit 

R: 24VAC

C: Neutral

Rc: 2nd 24VAC Transformer

Y: 1st Stage Compressor

W: (O/B) Reversing Valve

Y2: 2nd Stage Compressor

W2: AUX Heat

G: Fan


Single Duct Damper Actuator

R: 24VAC

C: Neutral

Rc: 2nd 24VAC Transformer

Y: 24VAC Damper Open

W: 24VAC Reheat

Y2 - 24VAC Damper Close

Duel Duct Damper Actuator

R: 24VAC

C: Neutral

Rc: 2nd 24VAC Transformer

Y: 24VAC Cool Damper Open

W: 24VAC Heat Damper Open

Y2: 24VAC Cool Damper Close

W2: 24VAC Heat Damper Close


Height: 3.5 inch (89 mm)

Width: 5.97 inch (150 mm)

Depth: 1.5 inch (38 mm)


Thermostat Range

Operating Range: -4 deg. F to 122 deg. F

Differential Temperature: +/- 0.5 deg. F

Operating Humidity (% RH): 5 to 90%; non-condensing

Integrated CO2 Sensor Range: 0 - 2000 PPM

Integrated CO2 Sensor Accuracy: +/- 50ppm; auto-calibration

Storage Temperature: -20 deg. F to 160 deg. F


System Protection

Thermostat Front Plate Tamper Proof Security Screw

Four Minute Compressor Short Cycle Protection

Temporary Schedule Override

Thermostat Keypad Lockout

Trend Data Analytic and Fault Monitoring

Auxiliary/Emergency Heat Efficiency Algorithm

High Limit CO2 (Air Quality Control)



Installation Instructions 



Product Specification


Application/Engineering Guides


Alternative text - include a link to the PDF!


What's in the box?


Find out what's in the box when you purchase a TS250 Internet Programmable Thermostat with COSensor.

How to remove and install Pelican's three-wire module


Watch to learn how to remove the WM500 Wiring Module from a Pelican thermostat and install it into a PEARL Economizer Controller.



Temperature and Alarm Sensor 


PEARL Economizer

Wireless Proximity Sensor



Temperature Only


Temperature and Humidity

Temperature, Humidity, & CO2