Carrier PTACSTAT-NP-HP - Manual (Page 11)

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11. Close thermostat assembly making sure pins on back of circuit board
align with sockets in connector.
12. Turn ON power to unit.
When power is applied, all display icons are lit for 2 seconds to test the display.
Following this, the equipment type for which the thermostat is configured is
displayed for an additional 2 seconds. It will be one of PH or PC (if HP, AC, H or C
is displayed, the thermostat is configured incorrectly to operate a PTAC). See
explanation under Step 3, Option 01 below. A heat pump thermostat, configured to
operate a HeatCool unit (see Option 1 below), will display PC. A HeatCool
thermostat cannot be configured to operate a HeatPump unit.
NOTE: If a common wire has not been connected, two AA batteries must be
used to power the thermostat.
Step 3 — Set Thermostat Configuration
Configuration options enable the installer to configure the thermostat for a particular
installation. These must be set correctly to insure proper PTAC operation. Following
is a list of the options available, an explanation of their function, and their factory
default settings.
Configuration Options -- Summary:
Option 01
-- Equipment type
Option 03 -- Fahrenheit/Centigrade
Option 04 -- Unused for PTAC
Option 07 -- Unused for PTAC
Option 10 -- Reversing valve (HP only)
Option 11 -- Minimum deadband between heating and cooling setpoints
Option 13 -- Room air temperature offset adjustment
Option 16 -- Maximum cycles per hour