Control By A/C Auto Amp.
Low Temperature Protection Control
When intake sensor detects that evaporator fin temperature is
[-5.0 deg. C (23.0 deg. F)] or less, A/C auto amp. requests ECM to turn the compressor OFF, and stops the compressor.
When the air temperature returns to
[1.0 deg. C (33.8 deg. F)] or more, the compressor is activated.
NOTE:
Target temperature upper limit value of evaporator can be changed using "TARGET EVAPORATOR TEMP UPPER LIMIT SETTING" in "WORK SUPPORT" mode of CONSULT. Refer to Diagnosis Description .
Refrigerant Discharge Amount Control
- When setting temperature is full cold or air outlet is other than DEF, A/C auto amp. controls the refrigerant discharge amount by adjust the duty ratio of ECV according to required amount of cooling capacity.
- When evaporator temperature is target temperature upper limit value or more, A/C auto amp. increases the discharge amount.
- When evaporator temperature is less than target temperature upper limit value, A/C auto amp. reduces the discharge amount.
NOTE:
Target temperature upper limit value of evaporator can be changed using "TARGET EVAPORATOR TEMP UPPER LIMIT SETTING" in "WORK SUPPORT" mode of CONSULT. Refer to Diagnosis Description .
Compressor Oil Circulation Control
When the engine starts, A/C auto amp. activates the compressor for a few seconds and circulates the compressor oil once.