Wrong Number Of Connected Units - Mitsubishi Electric PURY-(E)P200 Service Handbook

[ IX Troubleshooting ]
1. Error Code
7102

Wrong number of connected units

2. Error definition and error detection method
The number of connected indoor units is "0" or exceeds the allowable value.
3. Error source, cause, check method and remedy
Error source
Outdoor unit (1)
Number of units
Total number of indoor units
Number of BC controllers
Number of
Main BC controllers
Number of Sub BC controllers
Total number of LOSSNAY
units (During auto address
start-up only)
Total number of outdoor units
(2)
(3)
(4)
(5)
(6)
HWE07130
Cause
Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
Restriction on the number of units
1 - 20 : P200 model
1 - 25 : P250 models
1 - 30 : P300 models
1 - 35 : P350 models
1 - 40 : P400 models
1 - 45 : P450 models
1 - 50 : P500 models
2 - 50 : P550 models
2 - 50 : P600 models
2 - 50 : P650 models
2 - 50 : P700 - P800 models
(P200 - P350 models only)
1 : P200 - P400 models
2 : P450 - P800 models
Disconnected transmission line from the outdoor
unit or BC controller
Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
M-NET remote controller
Nothing appears on the remote controller be-
cause it is not powered.
MA remote controller
"HO" or "PLEASE WAIT" blinks.
The model selection switch (SW5-7) on the out-
door unit is set to OFF. (Normally set to ON)
Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
In a system with the P700 models of units or larger,
a BC controller other than the HA-type is used as
the main BC controller.
1)
2)
3)
4)
1
0 or 1
0,1 or 2
0 or 1
- 230 -
Check method and remedy
Check whether the number of units con-
nected to the outdoor terminal block
(TB3) for indoor/ outdoor transmission
lines does not exceed the limitation. (See
(1) and (2) on the left.)
Check (2) - (3) on the left.
Check whether the transmission line for
the terminal block for centralized control
(TB7) is not connected to the terminal
block for the indoor/outdoor transmission
line (TB3).
Check the setting for the model selection
switch on the outdoor unit (Dipswitches
SW5-7 on the outdoor unit control board).
GB