Standby Control
SiME332106E
52
Part 4 Functions and Control
3. Standby Control
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.
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
&
