Mitsubishi Electric MXZ-SM36NAM2 Technical & Service Manual page 15

How to determine the capacity when greater than 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.
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
Individual Indoor Temperature Correction Coef.
Outdoor Unit *1
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
Individual Indoor Unit Capacity: CT'
No
Does it fulfill the load of
Completed Selecting Units
Average Indoor temp. power input Coef. (
Input
Calculation
Outdoor Unit Input =Rated Outdoor Unit Input ×
× (CT )
i
OCH810A
n
) = ∑ (Individual Rated Indoor Unit Capacity CT
i
k=1
α
) (Figure 1, 4)
k
( CT )
i
No
CT ≤ CT
o i
Yes
) = CT
max o
L ≤ CT
o
Yes
indoor units?
No
α
CT ×
ik k
= CT ×
n
ik max
α
∑ (CT × )
im m
m=1
each room?
Yes
c
* :
Outdoor unit power input coefficient of k indoor unit room temp. (Refer to 4-2.)
k
M
* :
Number part of the k indoor unit model (e.g. P80 → 80)
k
c
)
ave
n n
c
= ∑ {c × (M / ∑ M )}
k k k
ave
k=1 k=1
c
ave
(x) is the approximate correction function when greater than 100%
model size units are input as connected.
×
ik
n: Total Number of Indoor Units
k: Indoor Unit Number
(x) is the approximate correction function when greater
than 100% model size units are connected.
(x) refers to STANDARD CAPACITY DIAGRAM.
Maximum Capacity(CT ) = CT
max
L ≤ CT
i
Yes
Need to select smaller
outdoor unit?
No
Does it fulfill the load of
each room?
Yes
Completed Selecting Units
Rated Outdoor Unit Capacity
< Total Indoor Units Capacity
Yes
Average Indoor temp. power input Coef. (
n
= ∑ {c
k=1
Outdoor Unit Input = Rated Outdoor Unit Input ×
× (CT )
i
15
Reselect the indoor units
Reselect the outdoor units
i
No
Yes
No
Outdoor Unit Input
= Rated Outdoor Unit Input ×
No
Outdoor Temperature
Correction Coef.
× (CT )
i
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
c
)
ave
n
× (M / ∑ M )}
k k k
k=1
c
ave