Safety For Restart - Daikin VRV K Manual

SI-95.BOOK Page 17 Friday, March 31, 2000 10:59 AM
Si-95
1.5

Safety for Restart

1.5.1 Restart Safety Timer
The compressor will not run for five minutes by making forced thermostat OFF condition in order to prevent
it from being turned on and off in rapid succession, and to equalize pressure in the refrigerant circuit. It
however restarts automatically after five minutes passes if it is in thermostat ON condition. The pressure
equalizing solenoid valve is actuated for 15 minutes after the compressor stops in order to equalize
pressure.
Indoor unit
electronic expansion
valve (when heating)
If 15 minutes or more has elapsed since the compressor was turned off, turn the solenoid valve for
equalizing pressure on for about 1 minute and equalize the pressure.
When heating, to prevent noise produced by the passing of indoor unit's refrigerant to equalize pressure
after the compressor stops, fully close the indoor unit's electronic expansion valve for 10 minutes.
1.5.2 Soft Start
The following control is carried out to protect the compressor and inverter.
1. Operates at low frequency (fixed) for 1 minute after compressor starts. (Prevents liquid refrigerant
2. Hot gas bypass solenoid valves open and start low load.
Soft Start of
Compressor
Functions Inverter K Series
Thermostat ON
Thermostat
OFF
Thermostat
ON
OFF
Compressor
5 minutes
ON
OFF
Pressure equalizing
solenoid valve
Linear control
1000 pulses
Fully closed
0 pulses
backflow)
42Hz
Soft start
1 minute
Frequency during soft start
42Hz+OFF
Thermostat ON
Thermostat OFF
ON
OFF
ON
OFF
1 minute 15 minutes
(Soft start)
Linear control
Fully closed
240 pulses
0 pulses
10 minutes
(VG001)
Functions
Thermostat ON
ON
ON
OFF OFF
1 minute 1 minute
(Pressure (Soft start)
equalizing)
Linear control
1000 pulses
(VL005)
Time
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