Daikin 3MKS50E3V1B Service Manual page 434

Field Settings
5.3.3 MAIN / SUB Setting when Using 2 Wired Remote Controllers
Outline The MAIN / SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers.
When you use 2 remote controllers (control panel and separate remote controller), set one to
MAIN and the other to SUB.
Detail
The remote controllers are factory set to MAIN, so you only have to change one remote
controller from MAIN to SUB.
BRC1D528
BRC1E52A7, BRC1E52B7
422
Step Action
1 Insert a flat screwdriver into the groove between the upper and lower part of the
remote controller, as shown in the illustration below. Gently pry off the upper part
of the controller, working from the two possible positions.
2 Set the [MAIN / SUB changeover] switch on the PCB to "S".
Step Action
1 Put on the power for both remote controllers.
2 Determine which one is the sub/main remote
controller.
3 When Error code: U5 - Connection under
check Please wait for a moment is
displayed on both remote controllers, push
and hold the [Operation mode selector]
button of the sub remote controller for 4
seconds.
4
The sub remote controller now displays Sub
remote contrl.
Note) The main remote controller still
displays Main remote contrl.
5 After a few seconds, the basic screen is
displayed.
Upper part of the
remote controller
Lower part of the
remote controller
(R11738)
The switch is set to
MAIN (factory setting)
Set the switch to SUB.
(R11739)
Remote controller
(R12880)
(R12881)
Trial Operation and Field Settings
SiBE121135