Switch Settings - Mitsubishi Electric HP120TNU-A Service Handbook

[2-3 Switch Settings ]

2-3

Switch Settings

1. Switch setting
The necessary switch settings depend on system configuration. Before performing wiring work, refer to the following page(s).
[2-7 Example System with an MA Remote Controller]
[2-8 Example System with an ME Remote Controller]
[2-9 Example System with an MA and an ME Remote Controller]
If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not
function properly.
Units on which to set the switches
CITY MULTI indoor unit
LOSSNAY, OA processing unit
ATW
ME remote controller
MA remote controller
CITY MULTI outdoor unit
BC controller
*1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line.
*2. The outdoor units in the same refrigerant circuit are automatically designated as OC and OS in the order of capacity
from large to small (if two or more units have the same capacity, in the order of address from small to large).
*3. Turn off the power to all the outdoor units in the same refrigerant circuit.
*4. When setting the switch SW4 of the control board, set it with the outdoor unit power on. Refer to the following page(s).
[5-1-1 Outdoor Unit Switch Functions and Factory Settings]
4
- chapter 2
Symbol
Main/sub unit IC
*1
LC
Booster Unit BU
Water Hex Unit AU
Main/sub remote RC
controller
Main/sub remote MA
controller
*2
OC,OS
Main BC
Sub1 - 11 BS1 - 11
Units to which the power must be shut off
*3
Outdoor units and Indoor units
*3
Outdoor units and LOSSNAY
Outdoor units and Booster Unit
Outdoor units and Water Hex Unit
*3
Outdoor units
Indoor units
*3
Outdoor units
*3
Outdoor units and BC controller
*3 *4
Outdoor units and BC controller
HWE18220_GB