Mitsubishi Electric CITY MULTI PUHY-M200-300YNW-A1 Data Book page 23

8. CAPACITY TABLES
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
i
Individual Indoor Temperature Correction Coef.
Outdoor Unit
Outdoor Unit Capacity (CT ) = Rated 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
Individual Indoor Unit Capacity: CT'
No
Does it fulfill the load of
Completed Selecting Units
Average Indoor temp. power input Coef. (
Outdoor Unit Input =Rated Outdoor Unit Input ×
× (Model Size Ratio) (Fig.3)
1.2
1.0
0.8
0.6
0.4
0.2
1.2
1.0
0.8
0.6
0.4
0.2
50 100 150
Total capacity of indoor units
Fig.3 Correction by total indoor
MEES19K116
n
) = ∑ (Individual Rated Indoor Unit Capacity CT
k=1
α
) (Fig.1)
k
(Model Size Ratio)
No
CT ≤ CT
o i
Yes
) = CT
x o
L ≤ CT
o
Yes
indoor units?
No
α
CT ×
ik k
= CT × n
ik x
α
∑ (CT × )
im m
m=1
each room?
Yes
c
* : Outdoor unit power input coefficient of k indoor unit room temp. (Fig.2-2)
k
M
* : Number part of the k indoor unit model (e.g. M80 → 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.
Cooling
Heating
200 250 300
×
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 (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
Rated Outdoor Unit Capacity
< Total Indoor Units Capacity
Yes
Average Indoor temp. power input Coef. (
n
= ∑ {c × (M
k
k=1
Outdoor Unit Input = Rated Outdoor Unit Input ×
× (CT /Rated Outdoor Capacity) (Fig.3)
i
1
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0 20 40 60 80 100
Piping equivalent length (m)
Fig.4 Correction of refrigerant piping length
Reselect the indoor units
Reselect the outdoor units
Outdoor Unit Input
= Rated Outdoor Unit Input ×
Outdoor Temperature
Correction Coef. (Fig.2-2)
× (CT / Rated Outdoor Capacity)
i
(Fig.3)
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
c
)
ave
n
/ ∑ M )}
k k
k=1
c
ave
Total capacity of indoor unit
100
150
200
260
120 140 160 180
Y-Series
21