Mitsubishi Electric CITY MULTI PUHY-HP72-240TNU-A Data Book page 33

8. CAPACITY TABLES
How to determine the capacity when greater than 100% indoor model size units are connected in total:
Determine the load (L) and
the Indoor/Outdoor Temperature
Temporarily select the indoor/outdoor units
Reselect the indoor units
Reselect the outdoor units
Indoor Unit
Total Indoor Units Capacity (CT
i
Indoor Temperature Correction Coef.
Outdoor Unit
Outdoor Unit Capacity (CT ) = Nominal Outdoor Unit Capacity ×
o
× Outdoor Temperature Correction Coef. (Fig.2-1)
× Piping Length Correction Coef. (Fig.4) × Defrost Correction Coef. (in heating)
Maximum Capacity(CT
No
Yes
Want to change to smaller
No
Does it fulfill the load of
Completed Selecting Units
Outdoor Unit Input =Nominal Outdoor Unit Input ×
× (Model Size Ratio) (Fig.3)
1.2
1.0
0.8
0.6
0.4
1.2
1.0
0.8
0.6
0.4
20 30 40 50
Total capacity of indoor units
Fig.3 Correction by total indoor
MEES21K108
n
k=1
) (Fig.1)
k
(Model Size Ratio)
No
CT
o i
Yes
) = CT
x o
L CT
o
Yes
indoor units?
No
CT ×
ik k
= CT ×
n
ik x
× )
im m
m=1
each room?
Yes
c
* :
k
M
* :
k
c
Coef. ( )
n n
c
= {c × (M / M )}
k k k
k=1 k=1
c
model size units are input as connected.
P72
Cooling
Heating
60 70 80 90 100
×
ik
n: Total Number of Indoor Units
k: Indoor Unit Number
than 100% model size units are connected (Fig.3)
Maximum Capacity(CT ) = CT
x i
No
L CT
i
Yes
Yes
Need to select smaller
outdoor unit?
No
No
Does it fulfill the load of
each room?
Yes
Completed Selecting Units
No
Nominal Outdoor Unit Capacity
< Total Indoor Units Capacity
Yes
Coef. (
n
= {c × (M
k
k=1
Outdoor Unit Input = Nominal Outdoor Unit Input ×
× (CT /Nominal Outdoor Capacity) (Fig.3)
i
1
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 100 200 300
0 31 61 92
Fig.4 Correction of refrigerant piping length
Hyper Heating Inverter Y-Series
Reselect the indoor units
Reselect the outdoor units
Outdoor Unit Input
= Nominal Outdoor Unit Input ×
Outdoor Temperature
Correction Coef. (Fig.2-2)
× (CT / Nominal Outdoor Capacity)
i
(Fig.3)
100% model size units are input as connected.
c
)
n
/ M )}
k k
k=1
c
Total capacity of indoor unit
36
54
72
94
400 500 600 ft.
122 153 183 m
31