Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook page 30

(3) Settings of MA remote controller Main/Sub switching switch (When MA remote controller is used: factory setting
"Main")
Main/sub settings are available on the MA remote controller. When two remote controllers are connected, set either of
them to "Sub".
(4) Selecting the position of temperature detection for the indoor unit (Factory setting: SWC "Standard")
To use a suction temperature sensor, set SWC to "Option". (The suction temperature sensor is supplied as standard
specification.)
(5) Connection of two refrigerant circuits
When two refrigerant circuits are connected on site, make the switch settings on the controller circuit board following the
instructions described in the installation manual for the indoor unit.
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[ II Restrictions ]