Mitsubishi Electric CITY MULTI PQRY-P200YMF-C 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 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 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 limitations.
Trouble source:
Heat source 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 :
Heat source unit
Indoor unit
7102 Connected unit count over
Number of units connected in the
same refrigerant system exceeds
limitations.
Trouble source:
Heat source 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 200m
• RC wiring Less than 12m
4) Damping of transmission voltage/
signal due to improper type of
transmission line.
• Wire size : More than 1.25mm
Cause
1) Total capacity of indoor units in the
same refrigerant system exceeds
the following:
Model Total capacity Total capacity code
PQRY-P200 302
PQRY-P250 378
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 heat source/in-
door transmission line exceeds limi-
tations given be-lows:
Item Limitation
1 Total of 1~15 (P200)
Indoor unit 1~16 (P250)
2 Total of Indoor
1~35
unit & RC
3 Total of BC
1
controller
–125–
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
62
power source of heat source unit, and indoor unit
78
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 heat source unit control circuit) of OC.
250
... 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/heat source transmis-
sion wiring (TB3) of heat source unit is not ex-
ceeding the limitation.
(See 1 ~ 2 left.)
b) Check for 2), 3), and 4).
c) Check for the connection of transmission wiring
to the terminal block for centralized control is
erroneously connected to the indoor/heat source
transmission wiring terminal block (TB3).