Lennox Mini-Split Service Manual / Page 257
Outdoor Fan Control
Cooling Mode
Normally the system will choose the running fan
speed according to ambient temperature:
7
$ '&B)$1B+,B63'B$''
% '&B)$1B0,'B63'B$''
& '&B)$1B0,1B63'B$''
' '&B)$1B6/2:B63'B$''
( '&B)$1B66/2:B63'B$''
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When low ambient cooling is valid:
Outdoor fan speed control logical (low ambient
cooling).
When T4 <15°C (59°F) and T3 < 30°C (86°F), the
unit will enter into low ambient cooling mode. The
outdoor fan will choose speed according to T3.
When T3≥38°C (100.4°F) or when T4≥20°C (68°F),
the outdoor fan will choose the speed according to
T4 again.
27
High
Low
25
20
15
low ambient cooling
38
Exit low ambient cooling
mode
, run with high fan
for 1 minute
Low
30
27
23
off
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