Lennox Mini-Split Service Manual / Page 255
Outdoor Temperature (T4)
Heating
<0°C <12°C 12°C to 17°C ≥17°C
<32°F <53.6°F 53.6°F to 77°F ≥62.6°F
Modify
Rate
120% 80% 40% 20%
When there more than one indoor unit:
Outdoor Temperature (T4)
Heating
<0°C <12°C 12°C to 17°C ≥17°C
<32°F <53.6°F 53.6°F to 62.6°F ≥62.6°F
Modify
Rate
120% 100% 80% 60%
NOTE - The fi nal result is integer.
Then modify it according to T2 average (correction):
NOTE - Average value of T2: Sum T2 value of all
indoor units)/ (indoor units number).
According to the fi nal capacity request to confi rm the
operating frequency, as following table.
Heating capacity improved in low ambient heating
In heating mode, when T2<T2_ExitT4LowFre_
ADD , and T4<-4°C, there is frequency elevation:
elevated frequency= Recent frequency * 110%
Frequency
(Hz)
0
HEAT_
F1
HEAT_
F2
...
...
HEAT_
15
HEAT_
16
Amendatory
capacity
demand
01 2
...
...
15 16
When T2> T2_ExitT4LowFre_ADD-2 and T4>-6,
the highest frequency can’t exceed F17
When T2> T2_ExitT4LowFre_ADD-4 and T4>-8,
the highest frequency can’t exceed F18
When T2> T2_ExitT4LowFre_ADD-6 and T4>-10,
the highest frequency can’t exceed F19
In the other conditions, the highest frequency is
F20
Capacity Area a b c d e f
Norm Code (N) 3 2 1.5 1 .5 0
Model 9K 12K 18K
HP 1.0 1.2 1.5
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