Lennox LIUH018021T431E-1 Service Manual page 112

16~60K
1.3.2.3 Indoor Fan Running Guidelines
In cooling mode, the indoor fan runs continuously and You can select the following speeds: high, medium,
low, auto or silent. When the compressor is running, The indoor fan is regulated as illustrated as in the
following figure:
The auto fan in cooling mode acts as follows:
Electrical Control System
C
T4
A+
A
B
C
D
E
F
G
H
I
Setting fan
T1-Td ℃(° F)
speed
A
H
B
C
D
M
E
F
G
L
H
I
A+
A
B
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
110