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6)
Compressor protecting function (Microcomputer and phase protection relay)
a)
Overcurrent control
(i) When a 52C secondary L
sensor CT), the compressor is stopped. The compressor is restarted after a 3-minute delay if the detection current is less
than 1.5 to 2A. If this condition is re-detected 5 times within 60 minutes of the first occurrence, an abnormal stop of the
unit is performed.
(ii) If 60 minutes passes and the detected current after the first to the fourth stoppage is not less than 1.5~2A, an
abnormal stop of the unit is performed.
b)
Open-phase Protection
When a 52C secondary detection current continues for 4 seconds when the compressor is on and when it is less than
1.5 to 2 A, it is determined to be a open-phase of the 52C secondary N-phase, and the compressor is stopped. The
compressor is restarted after a 3-minute delay and if this condition is re-detected within 60 minutes of the first
occurrence, an abnormal stop of the unit is performed.
c)
Detection of Abnormal Discharge Temperature
(i) When an abnormally high temperature is detected at the discharge pipe of the compressor (Tho-D detection), the
compressor is stopped. The compressor is restarted after a 3-minute delay and if this condition is re-detected 5
times within 60 minutes of the first occurrence, an abnormal stop of the unit is performed.
Operable
90
Discharge pipe temp. (°C)
(ii) If 60 minutes passes and the detected temperature after the first to the fourth stoppage is not less than 90 °C, an
abnormal stop of the unit is performed.
Note (1) Once an abnormal discharge temperature has occurred, restarting cannot be performed for 45 minutes.
[Detection temperature less than 3 °C]. (In failure mode, resetting cannot be performed by remote control.)
Operation is possible after 45 minutes. (Cleared by resetting power source.)
d)
Cooling overload protection
State of overload during cooling operation is detected (with Tho-R) based on the temperature of outdoor heat exchanger
and the unit operation is stopped / Immediate reset after repair
e)
Thermistor (Discharge Piping, Heat Exchanger and Outdoor Air Sensor) disconnected wire
(i) If there is a disconnected wire or if there is a big difference in performance characteristics, an abnormal stop of the
unit is performed. e Restore after repairing.
f)
Compressor inching prevention control
(i) Compressor 3 minutes delay control
The compressor will remain in stop state for three minutes. When the compressor is stopped by thermostat, ON/
OFF switch, and/or by occurrence of trouble. When the power source is turned ON, the three-minute delay timer is
cancelled.
(ii) Compressor 3 minutes forced operation control
Compressor cannot be stopped for 3 minutes after it started. However, it will be stopped immediately when the
thermostat is turned off due to the operation stop initiated by the ON/OFF switch or the change of operation mode.
Note (1) Both the error control and the protective control take priority over this control.
-phase continues for 0.5 seconds and when it is more than the set value (detection at current
1
Error stop
135
Operable
60°C
Outdoor heat exchanger temp.
Error stop
70°C
FDTN-H
255
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