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In addition, the adapter also affects the following function settings of the connected
indoor unit:
Mode
Mode 1 (auto recovery after power
failure)
Mode 2 (room temperature detection
location)
Mode 24 (heat offset for height)
Additional function settings not addressed by the thermostat interface may be
configured by temporarily connecting an MA remote controller.
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.
5. Usage
Operate the third-party thermostat per the manufacturer's instructions. During
normal operation, the connection of Mitsubishi remote controllers (e.g. MA/ME) is not
supported, as they will interfere with the correct operation of the PAC-US444CN-1.
Notes:
1. The indoor unit will limit the internal temperature control set point based on the
indoor unit specification.
2. Fan signals G1,G2,G3, when energized, take precedence over SW1-3&4.
3. Only fan speeds available on the IDU can be set by the Thermostat Interface.
4. The G signal is used only for operating the IDU in ventilation mode when all
cooling and heating signals are disabled.
5. When all cooling and signals are disabled, energizing G will place the IDU into
ventilation mode.
PAC-US444CN-1 Thermostat Interface Installation Instructions, May 2015
© 2015 Mitsubishi Electric US, Inc.
When using the adapter
Always enabled
Unused (room temperature detected by
the connected thermostat)
Unused
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