Mitsubishi Electric SMART MULTI MXZ-SM36NAM2-U1 Data Book page 19

7. 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
Outdoor Unit
Outdoor Unit Capacity (CT ) = Rated Outdoor Unit Capacity ×
o
× Outdoor Temperature Correction Coef. (Figure 2, 5)
× Piping Length Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating, Table 1)
Maximum Capacity(CT
No
Yes
Want to change to smaller
No
Does it fulfill the load of
Completed Selecting Units
A
Input
Calculation
Outdoor Unit Input =Rated Outdoor Unit Input ×
× (CT )
i
1.2
1.0
0.8
0.6
0.4
0.2
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0 2.0 4.0
Fig.3 Correction by total indoor
M-P0890
n
i
k=1
Temperature Correction Coef. ) (Figure 1, 4)
k
( CT )
i
No
CT
o i
Yes
) = CT
max o
L
o
Yes
indoor units?
No
CT ×
ik k
= CT × n
ik max
× )
im m
m=1
each room?
Yes
c
* : fficient of k indoor unit room temp. (Fig.2-2)
k
M
* :
k
c
)
n n
c
× (M )}
k k k
k=1 k=1
c
model size units are input as connected.
Cooling
Heating
6.0 8.0 10.0 12.0 14.0 16.0
Total capacity of indoor units (kW)
×
ik
n: Total Number of Indoor Units
k: Indoor Unit Number
than 100% model size units are connected.
(Refer to "7-3. Correction by total indoor".)
Maximum Capacity(CT ) = CT
max i
No
L
i
Yes
Yes
Need to select smaller
outdoor unit?
No
No
Does it fulfill the load of
each room?
Yes
Completed Selecting Units
No
Rated Outdoor Unit Capacity
< Total Indoor Units Capacity
Yes
A
n
× (M
k
k=1
Outdoor Unit Input = Rated Outdoor Unit Input ×
× (CT )
i
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0 50 100 150 200 250 300 350 400 450 500 550 600
Fig.4 Correction of refrigerant piping length
SMART MULTI
for reference.
Reselect the indoor units
Reselect the outdoor units
Outdoor Unit Input
= Rated Outdoor Unit Input ×
Outdoor Temperature
Correction Coef.
× (CT )
i
100% model size units are input as connected.
c
)
n
)}
k k
k=1
c
Total capacity of indoor unit [kBtu/h]
18
27
36
46.8
17