Toshiba MMU-AP0072H2UL Engineering Data Book page 16

2
Equipment selection procedure
[Chart 4]* Correction of outdoor unit diversity
* Coefficient to use for the correction of the outdoor unit capacity when the total capacity of the indoor units are not
equal to the outdoor unit capacity.
2-3-1-3. Capacity correction in case of frost on the outdoor heat exchanger when in
heating
Correct the heating capacity when frost can be found on the outdoor heat exchanger.
Heating capacity =Capacity after correction of outdoor unit x Correction value of capacity resulted from
[Chart 5] Capacity correction in case of frost on the outdoor heat exchanger
2-3-1-4. Rated conditions
Cooling: Indoor air temperature 80 °F DryBulb/67 °F WetBulb, Outdoor air temperature 95 °F DryBulb
Heating: Indoor air temperature 70 °F DryBulb, Outdoor air temperature 47 °F DryBulb/43 °F WetBulb
1.1
1
0.9
0.8
0.7
80 90
Indoor units total capacity ratio (%)
frost (Capacity after correction of outdoor unit: Heating capacity calculated in the
above item 2.)
1
0.95
0.9
0.85
0.8
-4 0 5 10
100 110
15 20 25 30
Outdoor air wet bulb temp. (°F WB)
15
120
35 40 45 50