Lennox MMA048S4

82
19.8. Outdoor Fan Control
19.8.1. Cooling Mode
Normally the system will choose the running fan speed according to ambient temperature:
T4
A DC_F AN_HI_SPD_ADD
B DC_F AN_MID_SPD_ADD
C DC_F AN_MIN_SPD_ADD
D DC_F AN_SLOW_SPD_ADD
E DC_F AN_SSLOW_SPD_ADD
23℃
22℃
20℃
28℃
19℃
17℃
26℃
25℃
When low ambient cooling is valid:
27
High
Low
25
20
15
low ambient cooling
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.
38
Exit low ambient cooling
mode
, run with high fan
for 1 minute
Low
30
27
23
off