Bosch CLC6001i 25 E, Service Manual

Page: 21 / 120

4-1
Climate Class 6100i / 6000i / 8100i / 8000i
CHAPTER 4. FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS
* These models have following thermistors
INDOOR UNIT OUTDOOR UNIT
TH1, TH2 TH1, TH2, TH3, TH4, TH5
The errors for the thermistors that are not mentioned above are irrelevant.
These indoor units don’t have power relay.
Function
Operation
Self-diagnosis
result display
Description Detection period Reset condition
Indoor
unit
error
display
Indoor
unit
Out-
door
unit
1
Indoor unit fan lock
Operation stops if there is no input of rotation
pulse signal from indoor unit fan motor for 1
minute.
When indoor unit
fan is in operation
Operation OFF or
ON
☆
2 Yes None
Indoor unit fan rota-
tion speed error
Operation stops if rotation pulse signal from
indoor unit fan indicates abnormally low speed
(about 300 rpm or slower).
When indoor unit
fan is in operation
Operation OFF or
ON
☆
2 Yes None
2
2-way valve freeze
prevention
Compressor stops if temperature of outdoor unit
2-way valve remains below 0°C for 10 contin-
uous minutes during cooling or dehumidifying
operation.
When in cooling
or dehumidifying
operation
Automatic reset
when tempera-
ture of 2-way
valve rises above
10°C.
None None Yes
3
Outdoor unit heat
exchanger overheat
shutdown
Operation frequency lowers if outdoor unit heat
exchanger temperature exceeds about 55°C
during cooling operation.
Compressor stops if outdoor unit heat exchanger
temperature exceeds about 55°C for 120 sec-
onds at minimum frequency.
When in cooling
or dehumidifying
operation
Automatic reset
after safety period
(180 sec).
None None Yes
4
Compressor dis-
charge overheat
shutdown
Operating frequency lowers if temperature of
compressor discharge thermistor (TH1) falls
below about 110°C.
Compressor stops if temperature of compressor
discharge thermistor (TH1) remains at about
110°C (for 120 seconds in cooling operation, or
60 seconds in heating operation) at minimum
frequency.
When compres-
sor is in operation
Automatic reset
after safety period
(180 sec).
None None Yes
5
Dehumidifying opera-
tion temporary stop
Compressor stops if outside air temperature
thermistor is lower than about 16°C during dehu-
midifying operation.
When in dehu-
midifying opera-
tion
Automatic reset
when outside air
temperature rises
above 16°C.
None None Yes
6 DC over current error Compressor stops if DC current of about 16 A or
higher flows in IPM.
When compres-
sor is in operation
Operation OFF or
ON
Yes
☆
3 Yes Yes
7 AC over current error
Operating frequency lowers if outdoor AC current
exceeds peak control current value. Compressor
stops if compressor AC current exceeds peak
control current value at minimum frequency.
When compres-
sor is in operation
Operation OFF or
ON
Yes
☆
1 Yes Yes
8
AC over current error
in compressor OFF
status
Indoor and outdoor units stop if outdoor
AC current exceeds about 3 A while compressor
is in non-operation status.
When compres-
sor is in non-op-
eration
Replacement of
defective parts
such as IPM
Yes
☆
2 Yes Yes
9
AC maximum current
error
Compressor stops if outdoor AC current exceeds
17 A.
When compres-
sor is in operation
Operation OFF or
ON
Yes
☆
2 Yes Yes
10
AC current deficiency
error
Compressor stops if operating frequency is 50
Hz or higher and compressor AC current is about
2.0 A or lower.
When compres-
sor is in operation
Operation OFF or
ON
Yes
☆
1 Yes Yes
11
Thermistor installation
error or 4-way valve
error
Compressor stops if high and low values of
temperatures detected by outdoor unit heat
exchanger thermistor (TH2) and 2-way valve
thermistor (TH5) do not match operating cycle.
3 minutes after
compressor start-
up
Operation OFF or
ON
Yes
☆
1 Yes Yes
12 Compressor high
temperature error
Compressor stops if compressor discharge
thermistor (TH1) exceeds about 114°C, or if
there is short-circuit in TH1.
When in opera-
tion
Operation OFF or
ON
Yes
☆
1 Yes Yes