Service manual

Controller
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♦ AUTORESTART is only valid to the remote control signal receiving through NIM or information
set by distance-control. It doesn’t remember the operation by manual button and forced button.
If power failure occurs and the air-conditioners are in operation by manual button or forced
button, after supplying power again, no AUTORESTART signal will be sent to air-conditioners
and the air-conditioners will be in stand-by.
♦ AUTORESTART has time-delay start function, which can avoid all air-conditioners start at the
same time when power on. The delay time is decided according to the address code in LAN.
And the calculation formula is 180s+n*2s, where, n means the address code and the effective
range is 0-63, and “s” means time unit Second. When the set delay time is arrived, send
AUTORESTART signal to PCB.
♦ During AUTORESTART time-delay, if the air-conditioners receive the Mode set operation by
users, including distance-control and local-control, the air-conditioners will cancel
AUTORESTART and run according to the present operation by users.
(4) Communicating with CCM RS485 and Data Treatment
The CCM RS485 and NIM adopt main-Slave response communication. All NIM that
connect with air-conditioners in network are Slave unit, and CCM is main unit. The NIM first
deals with the order from CCM then send signal to PCB. The CCM can lock the running mode of
air-conditioners by sending signal to NIM to avoid mode confliction (focus on commercial multi
system).
(5) Communicating with PCB
The NIM receives communication data sent by PCB and adopt asynchronous serial
communication. In normal case, the PCB doesn’t send data. Only when the remote control signal
interface receives the remote control signal from NIM, the PCB will reply response data at once.
(6) Receiving and treatment of remote control signal
The NIM can receive the remote control signal that conforms to the criterion of R51
Series Remote Controller. A t the same time, NIM will deal with the data of remote control
signal, then send signal to PCB.
(7) Malfunction Warning
If the signal sent by CCM can’t be received for 1 minute, it thinks communication
malfunction between NIM and CCM and malfunction code will be sent when responding to the
communication data of PC. The malfunction will relieve after receiving the response information
from PCB.
(8) Forced by outside
Air-conditioners can be forced ON/OFF through sending Forced ON/OFF to NIM by PC in
network.