Lennox MHA Series - Capacity Request Calculations

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16.3. Capacity Request Calculations
TotalcapacityRequest=Σ(Normcode×HP)/10×modifyrate+correction.
T1 Ts
3
1
1
e
c
a
4
2
0
2
3
0
1
f
d
b
Figure 25. Cooling Mode
CapacityArea a b c d e f
NormCode(N) 3 2 1.5 1 .5 0
NOTE: The nal result is integer.
Plusalltheindoorcapacityrequesttogether,thenmodifyitbyT4.
Whenthereisonlyoneindoorunit:
OutdoorTemperature(T4)
Cooling
>29°C 18°Cto29°C <17°C
>84.2°F 64.4°Fto84.2°F <62.6°F
ModifyRate 100% 60% 40%
Whenthereismorethanoneindoorunit:
OutdoorTemperature(T4)
Cooling
>25°C 17°C-25°C <17°C
>77°F 62.6°F-77°F <62.6°F
ModifyRate 100% 80% 40%
NOTE: The nal result is integer.
Inlowambientcoolingmode,modifyrateisxedas40%.
Accordingtothenalcapacityrequesttoconrmheoperatingfrequency,asfollowingtable.
Frequency(Hz) 0
COOL_
F1
COOL_
F2
...
...
COOL_
15
COOL_
16
Amendatorycapacity
demand
0 1 2
...
...
15 16
Meanwhilethemaximumrunningfrequencywillbeadjustedaccordingtotheoutdoorambienttemp.