Carrier 33tbac01 Installation Manual Top Patched

The Carrier is a specialized wall-mounted thermostat typically used for controlling fan coil units and small HVAC systems.

R – 24VAC hot (from transformer)
W – Heat stage 1
Y – Compressor / Cool stage 1
G – Fan relay
O/B – Changeover valve for heat pumps (energized in cool or heat depending on dip switch)
C – 24VAC common (required for electronic operation, though battery backup is optional)

Visual inspection: Verify all panels, fasteners, and seals installed.
Electrical checks: Confirm correct voltage, wiring, fuses, and grounding.
Refrigeration: Evacuate to manufacturer vacuum level, charge per spec, check superheat/subcooling at rated conditions.
Airflow: Measure static pressures and supply/return CFM; adjust dampers and fan speeds to match design.
Safety tests: Test high/low pressure cutouts, float switch, and fan interlocks.

Pull wires through the base’s opening.

Level the base and mark screw holes.

Drill anchors (if drywall) and screw the base flat against the wall.

Best Practices for a Smooth Installation carrier 33tbac01 installation manual top