SiUS181631EA Basic ControlFunctions and Control 552.4 Cooling Operation Fan ControlIn cooling operation with low outdoor temperature, cooling operation fan control provides theadequate amount of circulating air with liquid pressure secured by high pressure control using theoutdoor fan.When the outdoor temperature is ≥ 20°C (68°F), the fan operates in STEP 7 or higher.When the outdoor temperature is ≥ 18°C (64.4°F), it operates in STEP 5 or higher.When the outdoor temperature is ≥ 12°C (53.6°F), it operates in STEP 1 or higher.Fan StepsCoolingSTEP 0STEP 1STEP 2STEP 3STEP 4STEP 5STEP 6STEP 7STEP 8M1F0 rpm250 rpm400 rpm285 rpm360 rpm445 rpm580 rpm715 rpm850 rpmM2F0 rpm0 rpm0 rpm250 rpm325 rpm410 rpm545 rpm680 rpm815 rpmUpper limit of outdoorfan speed: STEP 8Upper limit of outdoorfan speed: STEP 7–1 step onoutdoor fan+1 step onoutdoor fanPc < 2.75 MPa (920 ftAq)PI controlPc > 3.24 MPa (1084 ftAq)Lapse of 20 sec.PI controlPI controlLapse of 20 sec.Hold thecurrent step onoutdoor fanPc: High pressure sensor detection value(R19078)
