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8. CAPACITY TABLES
8-1. Selection of Cooling/Heating Units
How to determine the capacity when less than or equal 100% indoor model size units are connected 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.
Reselect the indoor units
Reselect the outdoor units
Capacity
Determination
1.2
1.1
1.0
0.9
0.8
15
16
17
18
19
20
21
22
59
61
63
64
66
68
70
72
Indoor Temperature
Fig.1 Indoor unit temperature correction
MEES23K040
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
Temperature Correction Coef. (Fig.2-1) × Piping Length
Correction Coef. (Fig.4) × Defrost Correction Coef. (in heating operation)
Maximum Capacity(CT
No
Yes
No
Completed Selecting Units
Input
Calculation
Outdoor Unit Input = Nominal Outdoor Unit Input ×
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
23
24
[°CW.B.]
-5
0
5
10
15
20
73
75
[°FW.B.]
23
32
41
50
59
68
Outdoor Temperature
Fig.2-1 Outdoor unit temperature correction (capacity)
n
i
k=1
) (Fig.1)
k
) = Nominal Outdoor Unit Capacity × Outdoor
o
No
CT
o
i
Yes
) = CT
x
o
o
Yes
Want to change to smaller
indoor units?
No
CT
×
ik
k
= CT
×
n
ik
x
×
im
m
m=1
Does it fulfill the load of
each room?
Yes
c
*
: Outdoor unit power input coefficient of k indoor unit room temp. (Fig.2-2)
k
M
*
:
k
c
Coef. (
)
n
n
c
=
{c
× (M
/
M
)}
k
k
k
k=1
k=1
c
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
25
30
35
40
45
50
°CD.B.
77
86
95
104
113
122
°FD.B.
Reselect the indoor units
Reselect the outdoor units
×
ik
n: Total Number of Indoor Units
k: Indoor Unit Number
(If indoor to outdoor connectable
capacity ratio is less than 100%, the
capacity correction is set as 100% )
Maximum Capacity(CT
) = CT
x
i
Yes
Need to select smaller
outdoor unit?
No
Does it fulfill the load of
each room?
)
Yes
Completed Selecting Units
Coef. (
n
c
=
{c
k
k=1
Outdoor Unit Input = Nominal Outdoor Unit Input ×
×
(CT
/CT
) (Fig.3)
i
o
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
-5
0
5
10
15
20
25
30
35
40
45
23
32
41
50
59
68
77
86
95
104
113
Outdoor Temperature
Fig.2-2 Outdoor unit temperature correction (power input)
Y-Series
i
No
Yes
No
c
)
n
× (M
/
M
)}
k
k
k=1
c
Indoor Temperature
23.9°CW.B.
75°FW.B.
22.2°CW.B.
72°FW.B.
20.0°CW.B.
68°FW.B.
19.4°CW.B.
67°FW.B.
17.8°CW.B.
64°FW.B.
16.1°CW.B.
61°FW.B.
15.0°CW.B.
59°FW.B.
50
°CD.B.
122
°FD.B.
98
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