Lennox MHA Series - Outdoor Fan Control; Cooling Mode

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16.4. Outdoor Fan Control
16.4.1. Cooling Mode
Normallythesystemwillchoosetherunningfanspeedaccordingtoambienttemperature:
T4
A DC_FAN_HI_SPD_ADD
B DC_FAN_MID_SPD_ADD
C DC_FAN_MIN_SPD_ADD
D DC_FAN_SLOW_SPD_ADD
E DC_FAN_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