Lennox LIUH018021T431E-1 Service Manual page 114

16~60K:
1.3.3.2 Indoor Fan Running Guidelines
In heating mode, indoor fan speed can be set at high, medium, low, or auto fan, and the anti-cold-wind
function is preferential.
When the compressor is running, The indoor fan is regulated as illustrated as in the following figure:
When the indoor temp reaches the preset temperature, the compressor stops and the indoor fan motor runs
at the minimum speed (The anti-cold-wind is valid).
The auto fan in heating mode acts as follows:
Electrical Control System
T4
Setting fan
T1-Td℃
speed
H
M
L
A+
A
B
C
E
D
C
B
A
A+
Actual fan speed
H-（H-=H-G)
H（=H）
H+(H+=H+G)
M-(M-=M-Z)
M(M=M)
M+(M+=M+Z)
L-(L-=L-D)
L(L=L)
L+(L+=L+D)
Electrical Control Function
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