Step 1. Power Off System - Carrier TP-WEM01 Installation Instructions Manual

Step 1. Power Off the HVAC System
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in injury or death.
Before installing thermostat, turn off all power to equipment.
There may be more than one power disconnect.
Power off the HVAC system either by a switch at the indoor furnace or
fan coil or at the circuit breaker box.
Verify that the equipment is off by attempting to adjust the temperature
with the existing thermostat. The thermostat may show the temperature
change but your cooling or heating should not come on.
9