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Capacities and Selection Data
4.1.3 Check points for system installation
For selecting the unit capacity, perform the system selection with checking the refrigerant concentration at leakage in order
not to exceed the maximum permissible concentration.
(1)
(2)
(3)
(4)
(5) (6)
(7)
Calculate heating load for each room.
Select indoor unit capacity
Select outdoor unit capacity
Check unit capacity.
Rated Capacity of Outdoor Unit > Total Heating Load.
Yes
Calculate capacity of each indoor unit
Calculate the heating load at both cooling
and heating operation for each room.
Is there sufficient
indoor unit capacity?
Check whether the refrigerant
concentration at leakage is lower than
maximum permissible concentration.
Take safety measures. No
reconsideration of system is
required.
Adjust indoor unit
model
Yes
The selection is completed
Yes
No
No
No
No
(1) Selecting indoor unit capacity.
Set temporarily the indoor unit model and capacity in each room as following:
Heating Load for each room < Capacity of Indoor Unit
At this time, consider the correction factor according to room temperature.
Then, sum up each indoor unit capacity (The calculation is required for cooling and heating operation).
Indoor unit capacity = Rated capacity x correction Factor (room temperature)
Correction factor according to room temperature: When the estimated load for each room diers from the rated capacity
(cooling: 80.0 ºF (26.7 ºC )DB/67.0 ºF (19.4 ºC) WB; heating: 70.0 ºF (21.1ºC)DB, select the outdoor unit capacity at the
estimated load from the manual of Engineering Data.
Correction Factor (room temperature) = Outdoor unit capacity at estimated load / Rated outdoor unit capacity
(2) Selecting outdoor unit capacity.
Set temporarily the outdoor unit capacity according to the total connectable indoor unit capacity at the item (1). Then,
calculate maximum outdoor unit capacity with considering the correction factors according to temperature condition,
piping length and lift, and defrosting correction factor (for heating operation).
The calculation is required for cooling and heating operation
Outdoor unit capacity = Outdoor unit capacity at estimated load x Correction factors
(total indoor unit capacity. piping length, defrosting correction factor (for heating operation))
Outdoor unit capacity at estimated load: When calculating heating load for outdoor unit, check the ambient temperature.
If the ambient temperature diers from the temperature indicated in the rated capacity
(cooling: 95.0 ºF (35ºC) DB; heating: 47.0ºF(8.3ºC )DB / 43.0ºF(6.1ºC) WB), select the outdoor unit capacity at the
estimated load from the manual of Engineering Data.
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