Wrong Number Of Connected Units - Mitsubishi Electric PURY-P72 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 indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
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) Disconnected transmission line from the outdoor
unit or BC controller
(3) Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
ŒME remote controller
ŒMA remote controller
(4) The model selection switch (SW5-7) on the out-
door unit is set to OFF. (Normally set to ON)
(5) Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
(6) A BC controller other than the GA or HA type is
connected to a system that consists of P168 or
larger models of units OR a BC controller other
than the HA type is used as the main controller in
a system that consists of P264 or larger models of
units.
HWE09130
Cause
Restriction on the number of units
1 - 18 : P72 model
1 - 24 : P96 model
1 - 30 : P120 model
1 - 36 : P144 model
1 - 42 : P168 model
1 - 48 : P192 model
2 - 50 : P216 model
2 - 50 : P240 model
2 - 50 : P264 model
2 - 50 : P288 model
(P72- P144 models only)
0 or 1
0,1 or 2
0 or 1
1 : P72 - P144 models
2 : P168 - P288 models
Nothing appears on the remote controller be-
cause it is not powered.
"HO" or "PLEASE WAIT" blinks.
- 265 -
Check method and remedy
1) 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.)
2) Check (2) - (3) on the left.
3) 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).
4) Check the setting for the model selection
switch on the outdoor unit (Dipswitches
SW5-7 on the outdoor unit control board).
1
GB