Mitsubishi SRK19CNS-S, Technical Manual

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'14•SRK-T-164
(g) Serial signal transmission error protection
(i) Purpose:
Prevents malfunction resulting from error on the indoor outdoor signals.
(ii) Detail of operation:
If the compressor is operating and a serial signal cannot be received from the indoor control with
outdoor control having serial signals continuously for 1 minute and 55 seconds, the compressor is
stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a serial
signal can be received again from the indoor control.
(RUN light: ON, TIMER light: 6-time flash)
(h) Sensor disconnection (room temperature, indoor heat exchanger, outdoor heat exchanger, outdoor tempera-
ture, discharge pipe)
(i) Room temperature sensor
If the temperature detected by the room temperature sensor is – 45ºC or lower continuously for 15 seconds or longer while
operation is stopped, an error indication is displayed. (RUN light: 2-time flash, TIMER light: ON)
(ii) Indoor heat exchanger temperature sensor
If the temperature detected by the indoor heat exchanger temperature sensor is –28ºC or lower continuously for 15 seconds
or longer while operation is stopped, an error indication is displayed.
(RUN light : 1-time flash, TIMER light : ON)
(iii) Outdoor heat exchanger temperature sensor
–55ºC or lower is detected for 5 seconds continuously 3-time within 40 minutes after initial detection of this anomalous
temperature.
↔
Or –55ºC or lower is detected for within 20 seconds after power ON.
(RUN light : keep flashing, TIMER light : 2-time flash)
(iv) Outdoor air temperature sensor
(v) Discharge pipe temperature sensor
–25ºC or lower is detected for 5 seconds continuously 3-time within 40 minutes after initial detection of this anomalous
temperature.
–55ºC or lower is detected for 5 seconds continuously 3-time within 40 minutes after initial detection of this anomalous
temperature.
Or –55ºC or lower is detected for within 20 seconds after power ON.(RUN light : keep flashing, TIME Rlight : 1- time
flash)
Or –25ºC or lower is detected for within 20 seconds after power ON.(RUN light : keep flashing, TIME Rlight : 4- time
flash)
(f) Compressor overheat protection
If the discharge pipe temperature (sensed by Th3) exceeds the set temperature value, the compressor stops. If the temperature is 95ºC
or lower after a 3-minute delay, it starts again, but if this function is reactivated again within 60 minutes, it results in an abnormal stop.
(RUN light : ON, TIMER light : 5-time flash)
Discharge pipe temperature (°C)
Operation possible
Abnormal stop
110 21 type: 95
115 26 type: 95