Mitsubishi PUMY-P100YHM Technical & Service Manual page 49

From the previous page.
Display
Abnormal point and detecting method
6607
6) When the controller of displayed
address and attribute is not recognized
6608
No response
Though there was a replay (ACK) of
having received signal from the other
side, it is the abnormality when the
response command does not return.
The sending side detects the
abnormality continuously six times every
30 seconds.
Note) Address/Attribute displayed on the
remote controller shows the controller,
which did not response.
Causes
2) When synchronized operating with
other refrigerant system lossnay, the
indoor units transmits the signal to the
lossnay after the lossnay and same
refrigerant system outdoor unit is
turned off or turned on again in 2
minutes, and detects abnormality
3) Contact failure of lossnay or indoor
unit transmission line
4) Indoor unit transmission connector
(CN2M) disconnection
5) Sending/receiving signal circuit
failure in the indoor unit or lossnay
1) Since the address switch was
changed with the current passed, the
unit in the last address does not exist.
2) Since the fresh master/lossnay
address are changed after
synchronized setting of fresh master /
lossnay by the remote controller,
abnormality is detected at transmitting
from the indoor unit.
1) Transmission repeats the failure by
the noise etc.
2) Decline of transmission voltage and
signal by transmission line tolerance
over
· The furthest point···200m
· Remote controller line···(12m)
(Refer to 8-3.)
3) Decline of transmission line voltage
and signal by unmatched kind of line
· Shield wire-CVVS,CPEVS
Wire diameter···1.25 or more
4) Mis-operation of origin controller,
which happens by chance.
49
Check points
Check the transmission wave and
noise on the transmission line.
Turn off power supply of outdoor unit,
indoor unit and lossnay for 2minutes or
more at the same time. Then, turn on
power supply again. It normally
recovers fom the malfunction that
happens by chance. When same
abnormality occurs again, it is defective
of displayed address and attribute.