SiAF332111E Control for 6/8 HP Outdoor Unit
Part 4 Functions and Control 69
2.2 Stop Control
2.2.1 Abnormal Shutdown
In order to protect compressors, if any of the abnormal state occurs, the system will make "stop
with thermostat OFF" and the error will be determined according to the number of retry times.
(Refer to Error Codes and Descriptions on page 190 for the items to determine the error.)
2.3 Standby Control
2.3.1 Restart Standby
Used to forcedly stop the compressor for a period of 5 minutes, in order to prevent the frequent
ON/OFF of the compressor and equalize the pressure within the refrigerant system.
In addition, the outdoor fan carry out the residual operation for a while to accelerate pressure
equalizing and to suppress melting of the refrigerant to the evaporator.
2.3.2 Crankcase Heater Control
In order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this
mode is used to control the crankcase heater.
Ta_30, Ta_60: Outdoor air temperature 30 minutes before and 60 minutes before,
respectively.
V1 V2
2Y350 0.05664 –0.15151
2Y420 0.03021 –0.08081
• Ta 26°C
• Ta > 26°C
• Time-up
• V2 < (Ta – Ta_30)/30 < V1
• V2 < (Ta – Ta_60)/60 < V1
Crankcase heater
OFF
Crankcase heater
ON
OR
&
• Ta > 26°C
• (Ta – Ta_30)/30 V1
• (Ta – Ta_60)/60 V1
&
• Ta > 26°C
• Time-up
• V2 < (Ta – Ta_30)/30 < V1
• V2 < (Ta – Ta_60)/60 < V1
OR
&
• Ta > 26°C
• (Ta – Ta_30)/30 V2
• (Ta – Ta_60)/60 V2
&
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