SELECTION DATA
TCI-20007-rev.1
1-41
4.2 Selection Guide
The various indoor units can be combined with the HITACHI DC Inverter UTOPIA Series.
Selection of Unit Model Capacity Procedure is shown below.
(a) Selecting Indoor Unit Capacity
Set temporarily the indoor unit capacity in each room as follows.
Heating load for each room < Capacity of Indoor Unit
At this time, consider the correction factor according to temperature condition.
Then, Sum up each indoor unit capacity.
(b) Selecting Outdoor Unit Capacity
Set temporarily the outdoor unit capacity according to the total connectable indoor unit capacity at (a).
Then, calculate maximum capacity of outdoor unit considering the correction factor according to
temperature condition, piping length, lift and defrosting operation.
(c) Checking Unit Capacity
Check that the value of the rated capacity of the outdoor unit calculated at (b) is larger than the value
of the total heating load (for each room) calculated at (a). In the case that there is the surplus capacity
of the outdoor unit against the total capacity of the indoor units, increase the indoor unit capacity up
to the outdoor unit rated capacity. If the surplus capacity of the outdoor unit and the indoor units are
insucient, increase both capacities.
(d) Calculating each Indoor Unit Capacity
Calculate the indoor unit capacity as follows. The outdoor unit capacity is divided by the calculated
indoor unit capacities as necessary.
Capacity of Outdoor Unit = Rated Capacity x Correction Factor
Indoor Unit Capacity = Rated Capacity x Correction Factor (Room Temperature)
Yes
Calculate Heating Load on Each Room
Select Indoor Unit Capacity
Select Outdoor Unit Capacity
Calculate Capacity of Each Indoor Unit
No
Check Unit Capacity
Rated Capacity of Outdoor Unit > Total Heating Load
)
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