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5
DATA
5-1. Selection of indoor and outdoor units
■ How to determine the capacity when less than or equal 100% indoor model size units are connect-
ed in total:
The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended
only for reference.
Determine the load (L) and the indoor/outdoor temperature.
Temporarily select the indoor/outdoor units.
Indoor Unit
Total indoor units capacity (CT
Outdoor Unit
Outdoor unit capacity (CT
Maximum capacity (CT
Individual indoor unit capacity: CT
Average indoor temp. power input Coef. (C
Outdoor unit input = Nominal outdoor unit input × C
OCH800A_13
Reselect the indoor units
Reselect the outdoor units
n
) =
(Individual nominal (rated) indoor unit capacity CT
i
k=1
Individual indoor temperature correction coef. α
(Figure 1, 4)
n: Total number of indoor units
k: Indoor unit number
) = Nominal outdoor unit capacity ×
o
Outdoor temperature correction coef. (Figure 2, 5) ×
Piping length correction coef. (Figure 3, 6) ×
Defrost correction coef.
(In heating operation, Table 1)
(If indoor to outdoor connectable
capacity ratio is less than 100%, the
capacity correction is set as 100% )
No
CT
≤ CT
o
i
Yes
) = CT
max
o
No
L ≤ CT
o
Yes
Yes
Want to change to
smaller indoor units?
No
CT × α
n
= CT
×
(CT × α )
ik
max
m=1
No
Does it fulfill the load of
each room?
Yes
Selecting units is completed.
c
: Outdoor unit power input coef. of k indoor unit room temp.
k
(Refer to 4-2.)
M
: Number part of the k indoor unit model (e.g. P80 → 80)
k
)
ave
n
{C × (M / M )}
C
=
k
k
ave
k=1
k=1
ave
×
ik
)
k
ik
k
im
m
Average indoor temp. power input Coef. (C
n
k
Outdoor unit input = Nominal outdoor unit input × C
ƒ(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
Maximum capacity (CT
) = CT
max
i
No
L ≤ CT
i
Yes
Yes
Need to select smaller
outdoor units?
No
No
Does it fulfill the load of
each room?
Yes
Selecting units is completed.
)
ave
n
n
{C × (M / M )}
C
=
k
k
ave
k=1
k=1
׃ (CT
ave
Capacity
Determination
Input
k
Calculation
)
i
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