Engineering Manual

T-STAT Interface PAC-US444CN-1
CN24 Operation During Defrost
SW2-4: Adjusts Mode 23 function settings according to the following table:
SW2-4 Result Fan and CN24
OFF Setting 2 (Default) ON
ON Setting 1 OFF
*Refer to the appropriate Indoor Unit Installation Manual for Mode 23 function setting
Fan Speed During Heating Mode, Thermal Off
SW2-5: Adjusts Mode 25 initial setting (fan speed in thermal off for heating)
according to the following table:
SW2-5 Result
OFF Extra low (Default)
ON Set by Thermostat Interface
In addition, the adapter also affects the following function settings of the connected
indoor unit:
Mode When using the adapter
Mode 1 (auto recovery after power
failure)
Always enabled
Mode 2 (room temperature detection
location)
Unused (room temperature detected by
the connected thermostat)
Mode 24 (heat offset for height) Unused
Additional function settings not addressed by the thermostat interface may be
Grouping
The connection of more than one PAC-US444CN-1 to a single set of thermostat
dry-contacts is not supported.
Temperature Sensing
The PAC-US444CN-1 relies upon both the dry-contact thermostat and the
indoor unit’s thermistors in order to monitor room temperature. The thermostat’s
temperature sensing is used to set the room temperature. The indoor unit thermistor
is used when calculating cooling and heating rates of change.
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