01-19
1 -20. VARIOUS PROTECTIONS
1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL
2. COMPRESSOR TEMPERATURE PROTECTION CONTROL
3. LOW PRESSURE PROTECTION CONTROL
<After the compressor start-up and 10 minutes has passed>
<After the compressor start-up and 1 minute has passed>
(a).The detected value of pressure sensor is 0.02MPaG or less,
continues for 5 minutes, the compressor is stopped.
(b). When 7 minutes has passed and low pressure sensor detects
value is more than 0.05MPaG after the protection stop by (a),
the compressor restarts.
(c).When the protection (a) operates 5 times within 2 hours after the restart by (b),
the error is displayed and the compressor stops. [Permanent stop]
0.78MPaG
0.68MPaG
Release of protection
-8 rps every 1 minute
Pressure
(Fig 16 : Anti freezing protection)
115°C
105°C
100°C
Release of protection
Hold
Compressor stop
-10 rps every 2 minutes
Discharge
temperature
(Fig 14 : Discharge temperature control)
(a). When the discharge temperature becomes more than 115°C, the compressor is stopped under all conditions.
(b). The compressor restarts after 7 minutes has passed from the protection stop by (a).
(c). The error is displayed and the compressor stops when the discharge temperature becomes more than 115°C
again within 24 hours after the restart by (b). [Permanent stop]
1-1. Discharge Temperature Protection 1
1-2. Discharge Temperature Protection 2
(a). When the discharge temperature becomes more than 105°C,
the compressor speed -10 rps, and it continues the speed -10 rps
every 2 minutes until the temperature becomes less than 105°C.
(b). When the discharge temperature becomes less than 100°C,
the protection control of the compressor speed is released.
(a). When the compressor thermistor value becomes more than 112°C, the compressor is stopped
under all conditions.
(b). When 3 minutes has passed after the protection stop by (a), the compressor is restarted.
(c). When the compressor thermistor value becomes more than 112°C again within 24 hours
after the restart by (b), the error is displayed and the compressor is stopped. [Permanent stop]
(a).When the low pressure value becomes 0.68MPaG or less
continues for 1 minute, the compressor speed -8 rps.
(b). When the low pressure value becomes 0.68MPaG or less
after the protection (a), the compressor continues speed -8 rps
every 1 minute until the detected value becomes more than
0.68MPaG.
(c). When the low pressure value becomes more than 0.78MPaG,
this protection is released.
0.05MPaG
0.02MPaG
Release of protection
Hold
Compressor stop
Pressure
(Fig 15 : Low pressure protection 1)
Hold
3-1. Low Pressure Protection 1 (For Cooling and Heating)
3-2. Low Pressure Protection 2
Anti Freezing Protection (For Cooling mode)
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