Mitsubishi Electric CITY MULTI PUHY-400YMF-B Service Handbook page 180

Checking
Meaning, detecting method
code
6608 No response error
Though acknowledgement of re-
ceipt (ACK) is received after trans-
mission, no response command
is returned.
Detected as error by transmission
side when the same symptom is
re-peated 10 times with an inter-
val of 3 seconds.
Note)
The address/attribute shown
on remote controller indi-
cates the controller 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 exceeds
limitations.
Error 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.
Error source:
Outdoor unit
Indoor unit
7102 Connected unit count over
Number of units connected in the
same refrigerant system exceeds
limitations.
Error source:
Outdoor unit
Cause
1) At the collision of mutual transmis-
sion data when transmission wiring
is modified or the polarity is changed
while turning the power source on,
the wave shape changes detecting
error.
2) Repeating of transmission error due
to noise.
3) Damping of transmission line volt-
age/signal due to exceeding of the
acceptable range for transmission
wiring.
• Farthest Less than 200 m
• RC wiring Less than 12 m
4) Damping of transmission voltage/sig-
nal due to improper type of trans-
mission line.
• Wire size: More than 1.25 mm
Cause
1) Total capacity of indoor units in the
same refrigerant system exceeds the
following:
Model Total capacity
PUHY-400 520
PUHY-500 650
PUHY-600 780
PUHY-650 845
PUHY-700 910
PUHY-750 975
2) Erroneous setting of OC model se-
lector switch (SW3-10).
1 2 3 4 5 6 7 8 9 10
....
ON
...
OFF
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 limitations
given be-lows:
Model Total Indoor Units
1 PU(H)Y-(P) ··· YMF-B
2 PU(H)Y-(P) ··· YSMF-B
2) Slipping off of transmission wiring at
Outdoor unit.
3) Short circuit of transmission line in
case of 2) and 3), remote controller
displays "HO".
4) When PUHN is connected with SW4-
6 = OFF.
5) When PUHN is not connected with
SW4-6 = ON.
–177–
Checking method & Countermeasure
a) Generation at test run
Turn off the power sources of OC unit, IC unit
and Fresh Master for more than 5 minutes si-
multaneously, and make them again.
→ Returning to normal state means the trouble
detection due to transmission line work while
powering.
b) Check 3) and 4) of the causes left.
c) Investigate the transmission wave shape/noise
on transmission line according to <Investigation
method of transmission wave shape/noise>.
Much possibility if 6602 is generated.
2
Checking method & Countermeasure
a) Check for the model total (capacity cord total)
of indoor units connected.
b) Check whether indoor unit capacity code (SW2)
is wrongly set.
For erroneous switch setting, modify it, turn off
power source of outdoor unit, and indoor unit
simultaneously for 5 minutes or more to modify
the switch for setting the model name (capacity
coad).
Check for the model selector switch (Dip switches
SW3-10 on outdoor unit control circuit) of OC.
500, 250
400, 200
a) Check for the model name of the Indoor unit
connected.
b) Check for the switch (SW2 if indoor controller
for setting of Indoor unit model name of gener-
ating 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) Check whether the connection of units to the
terminal block for indoor/outdoor transmission
wiring (TB3) of outdoor unit is not exceeding
the limitation.
(See 1 ~ 2 left.)
b) Check for 2) ~ 5).
c) Check for the connection of transmission wiring
1 ~ 20
to the terminal block for centralized control is
1 ~ 32
erroneously connected to the indoor/outdoor
transmission wiring terminal block (TB3).