-
181
-
2) Low pressure error detection
a) If either of the following conditions is satisfi ed, the compressor is stopped.
If the low pressure is 0.079 MPa or lower continuously for 15 seconds after the compressor starts.
If the low pressure is 0.15 MPa after 10 minutes have passed since the compressor started and superheating
at 30°C continues for 60 seconds.
b) Operation resumes automatically when the low pressure becomes 0.227 MPa or higher.
c) If the conditions in
or
of item a) above occur 3 times within 60 minutes or if the low pressure drops to 0.079
MPa or lower for 5 minutes or longer continuously, including when the compressor is stopped, an anomalous
stop (E49) occurs.
(vi) High compression ratio protection control
During a heating operation, the compressor speed is controlled in accordance with the low pressure (PSL) and indoor
heat exchanger temperature (ThI-R1, R2).
1) Start conditions
When all the following conditions are satisfi ed
a) 10 minutes have passed since the compressor started.
b) The outdoor unit fan is ON and 10 minutes have passed since the outdoor unit fan started.
c) 10 minutes have passed since defrosting ended.
d) When the low pressure and indoor heat exchanger temperature detected values are within the control gone shown
in the following figure for 30 seconds.
e) The compressor speed exceeds 40 rps (for models 402-602) or 30 rps (for models 802, 1002) in heating opera-
tion except defrost operation.
2) Control
contents
The compressor’s speed is lowered. 1 minute later, detection is repeated and if the conditions in item d) continue to
exist, the speed is lowered still further.
3) End
conditions
When operation is outside the control region shown in item d) above for 6 minutes continuously.
(h) Inverter protection control
( i ) Current cut control
This prevents overcurrent at the inverter. If the current exceeds the set value, the compressor stops. It restarts automati-
cally 3 minutes later, but if the current is cut 4 times within a period of 30 minutes, an anomalous stop (E42) occurs.
(ii) Power transistor overheating protection
1) If the power transistor temperature rises to 110°C or higher, the compressor stops. If the temperature drops to 90ºC
or lower after 3 minutes, the compressor restarts automatically.
2) If this operation is repeated 5 times within 60 minutes (E41), or the temperature rises to 110°C or higher for 15
minutes (E51) continuously, an anomalous stop occurs.
Note (1) The anomalous stop (E41) occurs in models 802 and 1002 only.
(i)
Open phase protection
If the voltage of either the L1, L2 or L3 phase (3 phase models) or the L1-N phase (1 phase models) is 0 V for 5 seconds
continuously after the power is turned ON, it is judged that there is an open phase state in the power supply, and 1 second
later, an anomalous stop (E34) occurs.
(j)
Temperature thermistor (outdoor heat exchanger, ambient air, discharge pipe, suction pipe, under-dome)
and low pressure sensor disconnection
( i ) Outdoor heat exchanger temperature thermistor, ambient air temperature thermistor, low pressure sensor
If the conditions on the following page are detected for 5 seconds continuously between 2 minutes to 2 minutes 20
seconds after the compressor goes ON, the compressor stops. After a 3-minute delay, the compressor is restarted, but if
this state is detected 3 times within a 40-minute period, an anomalous stop occurs.
Note (1) This is not detected during defrosting and for 3 minutes after defrosting.
65
33
0.150
0.425
Low pressure (MPa)
Control gone
Indoor heat exchanger
temperature (˚C)
