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Johnson Controls T8490 7-Day 5-1-1 Programmable Thermostat

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Special Price $186.70 Regular Price $214.70
In stock
SKU
T8490
The Johnson Controls T8490 Thermostat is a multifunctional device developed for HVAC systems that provides accurate temperature control and energy savings.It has a 5-1-1 day option for flexible programming and has a 7-day programmable schedule and it operates on a 24V power supply. This thermostat is suitable for home and business use because it is compatible with most HVAC systems. The main advantage is that it can manage energy use with the help of programmable times that are easiest for controlling energy use at times when energy is not needed and when it is needed to be comfortable.
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HVAC Controls, Thermostat, HVAC Controls & Electrical
Manufacturer:
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Specifications

  • Voltage: 24V
  • Programming: 7-day, 5-1-1
  • Compatibility: Designed for HVAC systems
  • Weight: 0.71lbs
Manufacturer Name: Johnson Controls
Product Number: T8490
OEM Part Number: T8490
Product Description: 7Day 5-1-1 Prog Thermostat
Weight:0.71lbs/322.05g

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Product Questions (2)
Customer Questions
What maintenance is required for the Johnson Controls T8490 Programmable Thermostat?

Regularly clean dust from the thermostat and ensure sensors are unobstructed. Check wiring connections and replace batteries if applicable. Verify calibration and update seasonal settings. Always isolate power before servicing to maintain safety.

What are common issues with the Johnson Controls T8490 Programmable Thermostat?

  • Inaccurate temperature readings or sensor drift.
  • Unresponsive buttons or display malfunction.
  • Loss of programmed schedules or memory reset.
  • HVAC system not responding due to wiring or communication faults.
  • Short cycling or inconsistent temperature control.

Installation Steps

Step 1: Turn off HVAC power at breaker before starting installation for safety.

Step 2: Remove old thermostat and label existing wires.

Step 3: Mount base plate on wall and level it properly.

Step 4: Connect wires securely to matching terminals as per wiring diagram.

Step 5: Attach thermostat display unit to base and restore power.

Step 6: Test heating/cooling modes to confirm correct operation.