Mitsubishi City Multi PURY-P400 Service Handbook page 126

Checking
Meaning, detecting method
code
6608 No response error
Though acknowledgement of re-
ceipt (ACK) is received after
transmission, no response com-
mand is recived.
Detected as error by the trans-
mission side when the same
symptom is repeated 10 times at
3-second intervals.
Note:
The address/attribute
shown on remote control-
ler indicates the control-
ler which has detected
error.
(3) System error
Checking
Meaning, detecting method
code
7100 Total capacity error
Total capacity of indoor units in
the same refrigerant system ex-
ceeds the limit.
Trouble source:
Outdoor unit
7101 Capacity code error
Error display at erroneous con-
nection of Indoor unit of which
model name can not be con-
nected.
Trouble source :
Outdoor unit
Indoor unit
7102 Connected unit count over
Number of units connected in the
same refrigerant system exceeds
the limit.
Trouble source:
Outdoor unit
Cause
1) Caused by the transmission data
conflicts when transmission wiring
is modified or the polarity is
changed while turning the power on.
Wave shape change detection er-
ror will occur.
2) Repetition of transmission error due
to noise.
3) Damping of transmission line volt-
age/signal, due to exceeding the
acceptable range for transmission
wiring.
• Farthest Less than 200m
• RC wiring Less than 10m
4) Damping of transmission voltage/
signal due to the use of incorrect
type of transmission line.
• Wire side: Diameter larger than
2
1.25mm
Cause
1) Total capacity of indoor units in the
same refrigerant system exceeds
the following limits:
Model Total capacity Total capacity code
PURY-P400 599
PURY-P500 756
2) Erroneous setting of OC model se-
lector switch (SW3-10).
ON .....
OFF
1 2 3 4 5 6 7 8 9 10
SW3
1) The Indoor unit model name (model
code) connected is not connectable.
Connectable range.....20~250
2) Erroneous setting of the switch
(SW2) for setting of model name of
Indoor unit connected.
1) Number of unit connected to termi-
nal block (TB3) for outdoor/indoor
transmission line exceeds limita-
tions given belows:
Item Limit
1 Total number
1~24
of indoor units
2 Total number of
1
BC controllers
(master)
3 Total number of
0 or 1
BC controllers
(slave)
–125–
Checking method & Countermeasure
a) Generation of fault is during test run.
Turn off the power sources of OC unit, IC unit
and BC controller for more them 5 minutes si-
multaneously, and switch them on again.
→ Returning to normal state means, the trouble
detected due to transmission line work while
powering.
b) Check items 3) and 4) in the "causes" column
on the left.
c) Investigate the transmission wave shape/noise
on transmission line according to <Investigation
method of transmission wave shape/noise>.
There is a higher possibility of a noise if 6602
is generated.
Checking method & Countermeasure
a) Check the model total (capacity code total) of
indoor units connected.
b) Check whether indoor unit capacity code (SW2)
is wrongly set.
Correct the erroneous switch setting, if any, turn
123
off power source of outdoor unit and indoor unit
156
simultaneously for 5 minutes or more to modify
the switch for setting the model name (capacity
coad).
Check the model selector switch (Dip switches SW3-
10 on outdoor unit control circuit) of OC.
500
... 400
a) Check the model name of the Indoor unit con-
nected.
b) Check the switch (SW2 if indoor controller for
setting of Indoor unit model name of generating
address. When it is not agreed to the model
name, modify the capacity code while shutting
off the power source of Indoor unit.
* The capacity of Indoor unit can be confirmed by
the self-diagnosios function (SW1 operation) of
Indoor unit.
a) Make sure that the number of units connected
to the terminal block for indoor/outdoor transmis-
sion wiring (TB3) of the outdoor unit does not
exceed the limit.
(See 1 ~ 3 left.)
b) Check items 2), 3), 4), and 5).
c) Check the connection of transmission wiring to
the terminal block for centralized control to see
if it is erroneously connected to the indoor/out-
door transmission wiring terminal block (TB3).