26
Technical Information
Service Manual
If the discharge temperature protection continuously appears for
6 times, the compressor can’t resume running. The compressor
can resume running after cutting off the power and then putting
through the power. (if the running time of the compressor is longer
than 7min, the protection times record will be cleared)
2.4 Communication malfunction
Detection of the quantity of installed indoor units:
After 3min of energizing, if the outdoor unit does not receive the
communication data of certain indoor unit, the outdoor unit will
judge that indoor unit is not installed and will treat it as it is not
installed. If the outdoor unit receives the communication data of
that indoor unit later, the outdoor unit will treat that unit as it is
installed.
2.5 Overcurrent Protection
a. Overcurrent protection of complete unit; b. phase wire current
protection; c. compressor phase current protection
2.6 Compressor high-pressure protection
2.6.1 When the high-pressure switch is detected cut off for 3s
continuously, the compressor will enter high-pressure protection
as it stops when reaching set temperature. Meanwhile, the
outdoor unit will send the signal of “high-pressure protection” to
the indoor units;
2.6.2 After the appearance of high-pressure protection, when the
high-pressure switch is detected closed for 6s continuously, the
compressor can resume running only after cutting off the power
and then putting through the power.
2.7 Compressor overload protection
If the compressor overload switch is detected having movement,
the indoor unit will display the corresponding malfunction as it
stops when the indoor temperature reaching set temperature.
When the compressor stops for more than 3min and the
compressor overload switch is reset, the unit will resume
operation status automatically. If the protection appears for more
than 6 times (if the running time of the compressor is longer
than 30min, the protection times record will be cleared), the unit
can not resume operation status automatically, but can resume
running only after cutting off the power and then putting through
the power.
2.8 Compressor Phase-lacking Protection
When the compressor starts, if one of the three phases is detected
open, the compressor will enter phase-lacking protection.
The malfunction will be cleared after 1min, the unit will restart
and then detect if there is still has phase-lacking protection. If
the phase-lacking protection is detected for 6 times continuously,
the compressor will not restart but can resume running only after
cutting off the power and then putting through the power. If the
running time of the compressor is longer than 7min, the protection
times record will be cleared.
2.9 IPM Protection
2.9.1 When the IPM module protection is detected, the unit
will stop as the indoor temperature reaching set temperature,
PFC is closed, display IPM protection malfunction. After the
compressor stops for 3min, the unit will resume operation status
automatically; if the IPM protection is detected for more than 6
times continuously (If the running time of the compressor is longer
than 7min, the protection times record will be cleared), the system
will stop and send the signal of module protection to indoor unit.
The unit can not resume operation status automatically, but can
resume running only after cutting off the power and then putting
through the power.
2.9.2 IPM module overheating protection
2.9.2.1 When T
IPM
＞
85
O
C, prohibit to raise frequency;
2.9.2.2 When T
IPM
≥ 90
O
C, the operation frequency of compressor
lows down by 15% every 90s according to the present capacity
requirement of the complete unit. It will keep 90s after lowing
down the frequency. After lowing down the frequency, if T
IPM
≥
90
O
C, the unit will circulate the above movement until reaching the
minimum frequency; if 85
O
C
＜
T
IPM
＜
90
O
C, the unit will run at
this frequency; when T
IPM
≤ 85
O
C, the unit will run at the frequency
according to the capacity requirement;
2.9.2.3 When T
IPM
≥ 95
O
C, the compressor stops. After the
compressor stops for 3min, if T
IPM
＜
85
O
C, the compressor and
the outdoor fan will resume operation.
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