Lennox MPA012S4S-1L Service Manual page 255

Capacity Area
Norm Code (N)
Model 9K
HP 1.0
Outdoor Temperature (T4)
<0°C <12°C
Heating
<32°F <53.6°F
Modify
120% 80%
Rate
When there more than one indoor unit:
Outdoor Temperature (T4)
<0°C <12°C
Heating
<32°F <53.6°F
Modify
120% 100%
Rate
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
a b c d e
3 2 1.5 1 .5
12K 18K
1.2 1.5
12°C to 17°C ≥17°C
53.6°F to 77°F ≥62.6°F
40% 20%
12°C to 17°C
53.6°F to 62.6°F ≥62.6°F
80%
In heating mode, when T2<T2_ExitT4LowFre_
f
ADD , and T4<-4°C, there is frequency elevation:
0
elevated frequency= Recent frequency * 110%
Frequency
(Hz)
Amendatory
capacity
demand
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
≥17°C
In the other conditions, the highest frequency is
60%
F20
...
HEAT_ HEAT_
0
F1 F2
...
...
0 1 2
...
Lennox Mini-Split Service Manual / Page 255
HEAT_ HEAT_
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