01-20
(a). When the high pressure value becomes more than 4.10 MPaG, the compressor is stopped
under all conditions.
(b). When 3 minutes has passed after the protection stop by (a), and high pressure value
becomes *[ A ] MPaG or less, the protection is released and the compressor is restarted.
(a). When the high pressure value becomes more than 4.00MPaG, the compressor speed
-5 rps every 2 minutes until it becomes 4.00MPaG or less.
(b). When the high pressure value becomes 3.80MPaG or less, the protection is released.
4 . HIGH PRESSURE PROTECTION CONTROL
<After the start-up and 1 minute has passed>
4-1. Abnormal Stop
A
Cooling
Heating
3.8 3.0
4.10MPaG
4.00MPaG
3.80MPaG
Release of protection
*Hold
Compressor stop
-5 rps every 2 minutes
Pressure
(Fig 17 : Cooling pressure over rise protection)
4-2. Cooling Pressure Over Rise Protection
*During protection : Compressor speed is holded, or when a lower speed is directed, it accedes it.
During release of protection : Compressor operates according to the direction speed.
4-3. Limitation of the Compressor Upper Limit Speed
(a). The compressor upper limit speed is controlled by high pressure value as shown in Fig 18.
(b). The lowest upper limit speed is given to priority compared with other controls.
3.00MPaG
3.30MPaG
3.80MPaG
High pressure
(Threshold value)
Low pressure
80 rps
90 rps
95 rps
100 rps
High pressure = 1.25 Low pressure + 2.125
+
(Fig 18 : Limitation of the compressor upper limit speed)
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