Safety For Restart; Restart Safety Timer; Soft Start - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 28 Monday, November 6, 2000 4:13 PM
Functions
1.4

Safety for Restart

1.4.1

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 10 minutes (15 minutes for 8 and 10HP heating only) after the
compressor stops in order to equalize pressure.
Indoor unit
electronic expansion
valve (when heating)
If 10 minutes or more has elapsed since the compressor was turned off (15 minutes for 8 and 10HP heating
only) , 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 5 minutes (10
minutes for 8 and 10HP).
1.4.2

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. Pressure equalizing and hot gas bypass solenoid valves open and start low load.
Soft Start of
Compressor
28
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)
1 minute when started
5K
8,10K
Thermostat ON
Thermostat OFF
ON
OFF
ON
OFF
1 minute 10 minutes
(Soft start) (15 minutes for
8.10 HP heating only)
Linear control
Fully closed
240 pulses
0 pulses
5 minutes
(10 minutes
for 8 and 10 HP)
(VG001)
Frequency during soft start
42Hz
42Hz+OFF
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SiE-05C
Thermostat ON
ON
ON
OFF OFF
1 minute 1 minute
(Pressure (Soft start)
equalizing)
Linear control
1000 pulses
(VL005)
Time
Functions Inverter K Series