Lennox M33C024S4

97
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 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 nal capacity
request to con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%
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.
Frequency (Hz) 0
HEAT_
F1
HEAT_
F2
...
...
HEAT_
15
HEAT_
16
Amendatory capacity
demand
0 1 2
...
...
15 16