ecoclima CM2-H16/4DR2, Руководство по обслуживанию

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protects electronic components, power modules and compressors, etc. to prevent excessive heat accumulation and burn out. This
fault includes outdoor unit input current protection and compressor phase current protection.
2. Cause
of failure
2.1 outdoor unit input current protection
Outdoor unit controller detects AC current of external unit. When input current exceeds a certain threshold value, the controller limits
frequency, reduces frequency or stops compressor according to detected current, and if it reaches stop current value, it reports input
current protection of outdoor unit.
2.2 compressor phase current protection
Outdoor unit controller detects compressor phase current for frequency limitation, frequency reduction and shutdown of compressor.
When the compressor phase current exceeds the set value, it starts to reduce the frequency; when the frequency is reduced to the
lowest, the current is still greater than the set value, so the compressor stops.
3. Possible
failure point
In case of overcurrent protection, the possibility of input current protection is high in general, while the possibility of compressor
phase current protection is relatively small. Therefore, after-sales maintenance should first confirm whether it is input current
protection through the current clamp meter. The specific possible faults are as follows:
Outdoor unit input current protection:
Distortion or abrupt change of input voltage of power grid.
Abnormal system heat transfer:
Malfunction during refrigeration: the condenser of outdoor unit is dirty and blocked, the fan motor is faulty, and the ambient
temperature is too high.
Trouble during heating: the indoor evaporator is dirty and blocked, the fan motor is faulty, and the internal air deflector is not turned
on.
Compressor phase current protection (process reference module overcurrent protection)
4. Fault
handling flow
Seven: capacitor charging fault
1. Overview of faults
The voltage charging fault "EA" is displayed indoors.
The fault protection of capacitor charging circuit is mainly to ensure the normal charging of capacitor.
2. Cause
of failure
Outdoor unit controller detected abnormal voltage of large electrolytic capacitor.
3. Possible
failure point
Loose reactor lines (models using reactors), such as L03 and L04 reactors;
The voltage input voltage is too low;
PFC circuit is abnormal, such as fast recovery diode (D701, D702) open circuit;
Sudden change of grid voltage (such as power supply with air conditioner or large load in power supply, the load switch will instantly
cause grid fluctuation and sudden change of voltage)
4. Fault
handling flow
NO
NO
YE
S
YE
S
NO
YE
S
YE
S
NO
Overcurre
nt
protection
Low grid
input
voltage?
Voltage
distortion?
stabili
volt
Is the
evaporato
r/condens
er dirty?
Low speed of
indoor/outdoor fan? Is the
angle of air deflector too
small?
clear
Solve the problem
of motor or
abnormal air guide
Is the
pipeline
blocked? Is
the electronic
expansion
valve
operating?
Compressor has
abnormal noise?
Oil leakage, is the
casing
temperature too
high?
NO
Solve compressor
problems
Solve
the
problem
of
system
blockage
.
NO
Capacito
r
charging
fault
Is the
reactor
type
Turn off the power
supply and check
whether the connection
of the reactor is loose
after the voltage at both
ends of the capacitor is
lower than 20V
The terminal board
voltage is between
150 and 260 VAC
Use voltage
stabilizing
circuit
Replace the outdoor unit
controller assembly
Reconnect the reactor
according to the wiring
diagram
NO
YE
S
YE
S
YE
S