Chronothem IV T8665A - Thermostat HONEYWELL - Free user manual and instructions
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| Type | Programmable Thermostat |
| Brand | Honeywell |
| Model | Chronothem IV T8665A |
| Display | Digital LCD |
| Programmable | Yes, 7-day programmable with 4 periods per day |
| Power Supply | 24 VAC |
| Compatibility | Most 24V heating/cooling systems (gas, oil, electric) |
| Temperature Range | 5°C to 35°C (41°F to 95°F) |
| Accuracy | ±1°C |
| Dimensions (H x W x D) | 120 mm x 80 mm x 25 mm |
| Weight | 150 g |
| Modes | Auto, Cool, Heat, Off, Fan |
| Backlight | Yes |
| Battery Backup | Yes (maintains settings during power loss) |
| Warranty | 1 year |
| Maintenance | Clean with soft dry cloth; avoid liquids |
| Safety | Low voltage device; professional installation recommended |
| Repairability | No user-serviceable parts; contact qualified technician |
Frequently Asked Questions - Chronothem IV T8665A HONEYWELL
How do I set the time on my Honeywell Chronothem IV T8665A?
Press the Set button until the time flashes. Use the + and - buttons to adjust hours and minutes, then press Set again to confirm.
How do I program a 7-day schedule?
Press Program to enter programming mode. Select a day or group of days, then set the desired time and temperature for each period (Morning, Day, Evening, Night). Use +/- to adjust, then press Program to save.
Can I temporarily override the program?
Yes, press the + or - button to adjust the temperature manually. The thermostat will hold the new temperature until the next scheduled program period.
How do I replace the batteries?
Open the battery compartment on the back of the thermostat. Remove old batteries and insert two new AA alkaline batteries. Ensure correct polarity. The batteries maintain settings during power outages.
Why is my thermostat not turning on?
Check that the 24 VAC power is supplied from the HVAC system. Also ensure batteries are fresh if used. If still off, verify wiring connections or consult a professional.
How do I reset the thermostat to factory defaults?
Press and hold the Program and Set buttons simultaneously for 5 seconds. The screen will clear and reset to default settings.
Is this thermostat compatible with a heat pump?
Yes, the T8665A supports most heat pump systems. Ensure the O/B terminal is correctly wired for reversing valve operation.
How do I clean the thermostat?
Use a soft, dry cloth to wipe the display and casing. Do not use water, cleaning solutions, or abrasives as they may damage the device.
What does the 'Fan' mode do?
In Fan mode, the fan runs continuously without heating or cooling. This can help circulate air and improve comfort.
Can I lock the thermostat to prevent changes?
Yes, press and hold the + and - buttons together for 3 seconds to enable the keypad lock. Repeat to unlock.
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