Carrier MMY-MAP0724FT9UL Service Manual page 89

2
Be sure to disconnect the relay connectors between the [U1U2] and [U3U4] terminals on all
the header outdoor units that will be connected to the central control. (Factory default:
disconnected)
3
Turn on indoor units first, and then turn on outdoor units.
4
About 1 minute after turning the power on, confirm that the 7-segment display on the
interface P.C. board of the header outdoor unit indicates
5
Push SW 15 to start the automatic address setting.
(It may take up to 10 minutes (normally about 5 minutes) to complete one line's setting.)
6
The 7-segment display indicates
After the indication,
When the flashing stops and
is complete.
7
4
Repeat steps
8
After completing address setting of all systems, turn off dip switch 2 of SW30 on the
interface P.C. boards of all the header outdoor units connected to the same central control,
except the unit that has the lowest address.
(For unifying the termination of the wiring for the central control of indoor and outdoor units)
9
Connect the relay connectors between the [U1, U2] and [U3, U4] terminals of the header
outdoor unit of each refrigerant line.
2
U1
INDOOR
U. 1. - - - (U. 1. flash)
U. 1. - - - (U. 1. light) , remains lit on the display, the setting
6
to for other refrigerant lines.
9
U2 U3 U4 U5
TO
TO
CENTRAL
OUTDOOR
CONTROL
UNIT
UNIT
LER
Auto 1 → → → → → Auto 2 → → → → → Auto 3 .
starts flashing on the display.
U1 U2 U3 U4
TO
TO
CENTRAL
INDOOR
CONTROL
UNIT
LER
– 89 –
U6
TO
U. 1. L08 (U. 1. flash) .
U5 U6
TO
OUTDOOR
UNIT