Carrier 33tbac01 Installation Manual Top Instant
| Symptom | Possible Cause | Solution | | :--- | :--- | :--- | | | Incorrect wiring, no power, or incompatible power stealing. | Check for 24VAC at R and C terminals. If missing, turn on power or run a new "C" wire. | | Red LED Flashing | Sensor failure or sensor not connected. | Check sensor wiring. Replace the sensor if necessary. | | Blue/Red LED Flashing | System in "Self-Diagnosis" mode. | Normal operation. Wait for the self-test to complete. | | Room temperature does not match setpoint | Thermostat located in a bad spot (draft, sun, etc.). | Relocate the thermostat away from heat sources or drafts. | | Fan runs constantly | DIP Switch 2 is set to "On" (Continuous Fan). | If not desired, turn DIP Switch 2 to the "Off" position. | | System short cycles | System is configured for power stealing but not compatible. | Connect a common "C" wire to provide stable 24VAC power. |
To test the system, hold the mode button (seasonal switch) and press the fan button three times in 1 second.
| Switch | Setting 1 (Up/Off) | Setting 2 (Down/On) | What it changes | | :--- | :--- | :--- | :--- | | | Electric Heat | Gas/Oil Heat | Fan behavior (Gas delays fan start) | | SW2 | Standard Heat Pump | Conventional AC | Reversing valve logic (O vs B) | | SW3 | 2-pipe System | 4-pipe System | Valve control logic | | SW4 | Celsius (°C) | Fahrenheit (°F) | Display units | | SW5 | Standard (3 cycles/hr) | Comfort (6 cycles/hr) | Compressor cycling rate | | SW6 | Backlight Off | Backlight On | LCD illumination | | SW7 | Auto Fan disabled | Auto Fan enabled | Fan runs with heat/cool demand | | SW8 | 5 min compressor delay | 0 min delay | Anti-short cycle protection | carrier 33tbac01 installation manual top
Before beginning, turn off all power supplying the fan coil unit. Ensure your specific site matches the of the controller. Packaged Materials Included: Carrier 33TB-AC01 Control Unit Wall-mounting Backplate Screws and Wall Anchors Temperature Sensor (Air/Water configuration) Instruction Manual 📍 Step 2: Choosing the Optimal Mounting Location
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Shift the fan controller into Auto Mode . Adjust the temperature setpoint 4-5 degrees below the current room temperature. The micro-processor should automatically activate high fan speed along with the valve actuator output ( V ) to meet the cooling demand.
Default Setting: All switches are typically closed (OFF) by default. Step 4: Final Assembly | | Red LED Flashing | Sensor failure
Proper preparation is essential for a safe and successful installation.
The manual's first warning: Failure to do so can cause electrical shock or damage the transformer.
The 33TBAC01 has built-in diagnostic features. If the red LED (group on the right) flashes, it indicates a sensor fault (e.g., failure of the internal sensor or water temperature sensor).