Carrier 33tbac01 Installation Manual Top ✰ < GENUINE >

This thermostat operates on 24V AC. Do not use with line voltage (120V/240V).

The mechanical installation involves a sub-base mounting system designed to facilitate easy maintenance. The sub-base should be leveled meticulously—not only for aesthetic appeal but to ensure that gravity-based components or internal level-sensitive sensors operate correctly. Once the sub-base is secured using appropriate wall anchors, the 33TBAC01 controller "snaps" into place, establishing electrical contact with the pins on the sub-base. Installers must verify that the connection is flush to maintain the low air-leak performance required by high-efficiency standards. carrier 33tbac01 installation manual top

On the back of the thermostat circuit board, you will find small dip switches. These must be set before snapping the cover onto the base: This thermostat operates on 24V AC

If you set the switch to “Electric” but have a gas furnace, your fan will not come on during heat, causing the furnace to overheat and lock out. The sub-base should be leveled meticulously—not only for