Carrier RAV-SP180UT-UL Service Manual page 38

7-2-2. Connection of Wireless Remote Controller
Indoor unit
#1 Header unit
Indoor control P.C. board
(MCC-1510)
Receiver and
Display P.C. board
(MCC-5044)
Display LED
Receiver unit
Louver
motor
Indoor
fan motor
Power circuit
DC280V
Max. 8 units are connectable. ∗1
∗1 When group combination, wired remote controller shall be
connected to the follower indoor unit.
Central control
remote controller
(Sold separately)
U3
Central control
communication circuit
DC20V
DC12V
DC5V
Driver
Buzzer
Outside
output
Warning/
Thermo. ON/
Fan motor
COOL/HEAT/
control circuit
DC15V
U4 A B
Remote controller
communication circuit
CPU
H8/3039
Driver
Run/
Defrost/
AC
synchronous
signal input circuit
FAN
L1 L2 S
L1 L2 S
Outdoor unit
– 38 –
Follower unit
#2
A
EEPROM
TA sensor
Same as
the left
TC sensor
TCJ sensor
HA
Wireless remote
signal setting
(A/B)
Serial send/
receive circuit
1 2
Outdoor
unit
#3
B A B
Same as
the left
3 1 2 3
Outdoor
unit