Safety For Restart - Panasonic Urban Multi MX1R Series Service Manual

Using r-407c / r-22
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PACD011001C2
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 10 minutes (15 minutes for 8 and 10HP heating only) after the
compressor stops in order to equalize pressure.
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).
1.5.2
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. Pressure equalizing and hot gas bypass solenoid valves open and start low load.
Soft Start of
Compressor
Function Urban Multi "MX1, ME1 Series" Using R-22
Thermostat ON
Thermostat
OFF
Thermostat
ON
Compressor
OFF
Pressure equalizing
solenoid valve
Linear control
Indoor unit
electronic expansion
valve (when heating)
backflow)
42Hz
1 minute when started
CU-5
CU-8·10
Thermostat ON
ON
OFF
5 minutes
ON
OFF
1 minute
(Soft start)
Linear control
1000 pulses
Fully closed
0 pulses
Frequency during soft start
Thermostat ON
Thermostat OFF
OFF
ON
ON
OFF
10 minutes
1 minute
1 minute
(15 minutes for
(Pressure
(Soft start)
8.10 HP heating only)
equalizing)
1000 pulses
Fully closed
240 pulses
0 pulses
5 minutes
(10 minutes
for 8 and 10 HP)
Time
(VG001)
42Hz
42Hz+OFF
Function
ON
OFF
Linear control
(VL005)
27

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