Carrier MMY-MAP0724FT9UL Service Manual page 98

2) Turn on dip switch 2 of SW30 on the interface P.C. board of the header outdoor unit if the switch is OFF.
(Leave it as it is if it has already been set to ON.)
Header
unit
U3 U4
U1 U2 U5 U6
U1 U2 U1 U2
A B
Remote
controller
2
Turn on the indoor and outdoor units of the refrigerant line for which you want to initialize
the addresses. About one minute after turning on the power, confirm that the 7-segment
display on the header outdoor unit indicates "U.1. - - -" and operate the interface P.C. board
on the header outdoor unit of the refrigerant line as follows.
SW01 SW02 SW03
2 1 2
2 2 2
3
Confirm that the 7-segment display indicates "A.d. c.L." and set SW01, SW02 and SW03 to
1, 1, 1 respectively.
4
After a time "U.1.L08" appears on the 7-segment display if the address clearing has been
completed successfully.
If the 7-segment display indicates "A.d. n.G.", the outdoor unit may still connected with
other refrigerant lines. Check the connection of the relay connectors between [U1, U2] and
[U3, U4].
NOTE
Take care to carry out the procedure above correctly; otherwise, addresses in other refrigerate lines may also
be cleared.
5
Set the addresses again after finishing the clearance.
Header
Follower unit
unit
U3 U4
U1 U2 U5 U6
A B
Remote
controller
Indoor units to have their addresses initialized
SW04
Confirm that the 7-segment display indicates
"A.d.buS" and turn SW04 ON for more than five
seconds.
Confirm that the 7-segment display indicates
"A.d.nEt" and turn SW04 ON for more than five
seconds.
Follower unit
U3 U4
U1 U2 U5 U6 U1 U2
U1 U2 U1 U2
A B A B
Remote
controller
– 98 –
Header
unit
U3 U4 U3 U4
U5 U6 U1 U2
U1 U2
A B
Remote
controller
Clearable addresses
System/indoor unit/group address
Central control address
Central remote
controller
U1 U2
U3 U4
U5 U6