9105 - Thermostats STI - Free user manual and instructions
Find the device manual for free 9105 STI in PDF.
Pick your language and provide your email: we'll send you a specifically translated version.
| Product Type | Thermostat |
| Model | 9105 |
| Brand | STI |
| Display Type | Digital LCD |
| Mounting | Wall-mounted |
| Dimensions (W x H x D) | 90 x 90 x 30 mm |
| Weight | 150 g |
| Power Supply | 2 x AA batteries (1.5V each) or 24 VAC from HVAC system |
| Temperature Range | 5°C to 35°C (41°F to 95°F) |
| Accuracy | ±0.5°C |
| Programmable | 7-day programmable with up to 4 periods per day |
| Functions | Heating and cooling control, fan control, hold, vacation mode |
| Backlight | Yes, blue backlight |
| Low Battery Indicator | Yes, icon on display |
| Filter Replacement Reminder | Yes, programmable |
| Compatibility | Most 24V gas/oil/electric systems, heat pumps, and millivolt systems |
| Maintenance | Wipe with a soft, dry cloth. Do not use water or cleaning agents. |
| Spare Parts & Reparability | Replacement batteries and wall plate available. No user-serviceable parts inside. |
| Certifications | CE, RoHS |
| Warranty | 2 years limited |
Frequently Asked Questions - 9105 STI
How do I install the STI 9105 thermostat?
First, turn off power to your HVAC system at the breaker. Then remove the old thermostat and label wires. Mount the new wall plate, connect wires to the corresponding terminals (R, W, Y, G, etc.), and attach the thermostat body. Insert batteries and restore power. Refer to the manual for wiring details specific to your system.
How do I program the 7-day schedule?
Press the Menu button, then select Schedule. Use the arrow keys to set the time and temperature for each period (Wake, Leave, Return, Sleep) for each day. You can copy one day to another. Confirm settings with Done.
What should I do if the display is blank?
Check if the batteries are correctly inserted and have charge. Replace them if needed. If the thermostat is hardwired, ensure the 24VAC power is present. If the problem persists, reset the thermostat by removing batteries and waiting one minute.
How do I reset the thermostat to factory defaults?
Press and hold the Menu and Up buttons simultaneously for 10 seconds until the display clears. This will erase all schedules and restore default settings.
What is the temperature range of the STI 9105?
The thermostat can control temperatures from 5°C to 35°C (41°F to 95°F) with an accuracy of ±0.5°C.
Can this thermostat be used with heat pumps?
Yes, the STI 9105 is compatible with most heat pump systems. In the installer setup, you can select the Heat Pump option and configure the reversing valve (O/B) as needed.
How often should I change the batteries?
Batteries typically last about one year. The low battery icon will appear on the display when replacement is needed. We recommend using high-quality alkaline or lithium batteries.
Does the thermostat have a backlight?
Yes, the STI 9105 features a blue backlight that illuminates when any button is pressed. The backlight stays on for 10 seconds after the last press.
How do I set the filter reminder?
Go to Menu > Settings > Filter. Set the desired run time in hours (e.g., 720 for 30 days). The thermostat will display a reminder when the filter needs replacement.
What does the 'Hold' function do?
The Hold feature temporarily overrides the programmed schedule. Press Hold to set a constant temperature. To cancel hold, press Run to resume the schedule.
User questions about 9105 STI
0 question about this device. Answer the ones you know or ask your own.
Ask a new question about this device
No questions yet. Be the first to ask one.
Download the instructions for your Thermostats in PDF format for free! Find your manual 9105 - STI and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. 9105 by STI.
USER MANUAL 9105 STI
Manual assistant
Powered by Anthropic
Waiting for your message
Product information
Brand : STI
Model : 9105
Category : Thermostats