Heating Mode - Lennox MPA009S4S Service Manual

Heating Mode

Plus all the indoor capacity request together, then multiply it by T4.
When there is only one indoor unit:
Capacity Area
Norm Code (N)
Model
HP
Heating
Modify Rate
When there more than one indoor unit:
Heating
Modify Rate
NOTE: The final result is integer.
Then modify it according to T2 average (correction):
49
46
43
41
38
Figure 84. Heating Mode
T1 Ts
4
3
2
1
0
9K
1.0
Outdoor Temperature (T4)
<0°C <12°C
<32°F <53.6°F
120%
Outdoor Temperature (T4)
<0°C <12°C
<32°F <53.6°F
120% 100%
T4LimFre5_ADD
T4LimFre4_ADD
T4LimFre3_ADD
T4LimFre2_ADD
T4LimFre1_ADD
No limit
f
e
d
c
b
a
a b
3 2
12K
1.2
53.6°F to 77°F
80%
53.6°F to 62.6°F
162
48
45
42
39
37
3
2
1
0
-1
c d
1.5 1
12°C to 17°C
40%
12°C to 17°C
80%
e f
.5 0
18K
1.5
≥17°C
≥62.6°F
20%
≥17°C
≥62.6°F
60%