Mitsubishi Electric PQHY-P250YHM-A, Data Book

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5. Types of switch settings and setting methods
Whether a particular system requires switch settings depends on its components. Refer to the section “6. Sample System
Connection” before conducting electrical work.
Keep the power turned off while setting the switches. If settings are changed while being powered, the changed settings will
not register, and the unit may malfunction.
*10HP has only the main controller
(1) Address settings
The need for address settings and the range of address setting depend on the configuration of the system.
Refer to the section “6. Sample System Connection”.
(Note1) If a given address overlaps any of the addresses that are assigned to other outdoor units, use a different, unused
address within the setting range.
(Note2) To set the address of an outdoor unit to "100", set it as 50.
Unit Symbol
Outdoor unit OC Turn off the power to outdoor unit
Indoor unit Main/sub controllers * IC Turn off the power to indoor and outdoor units
Unit or controller Symbol
Address
setting range
Address setting method
Factory setting
Model
Indoor unit Main · Sub IC
01~50
(Note 1)
In case of 10HP system or 20HP system with one
refrigerant circuit, assign an odd number starting with
"01".
In case of 20HP system with two refrigerant circuits,
assign a sequential odd number starting with "01" to
the upper indoor controller, and assign "the address
of the upper indoor cont 1" to the lower indoor
controller.
(For the system with one refrigerant circuit, the lower
circuit board is not used.)
00
MA remote controller MA
No address setting required.
(The main/sub switch must be configured if two remote controllers
are connected to the system or if the indoor units are connected to
different outdoor units.)
Main
Outdoor unit
Heat source unit OC
OS 51~100
(Note 2)
In the system that consists of single refrigerant circuit,
assign an address that equals the lowest indoor unit
(main) address in the same refrigerant circuit plus 50.
Assign sequential addresses to the outdoor units in
the same refrigerant circuit. Set the OC address to
odd number address and OS address to even number
address on the computer room outdoor unit.
In the system that consists of two refrigerant circuits,
assign an address that equals the connected indoor
unit control board address plus 50.
00