Data - Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual

DATA

4
4-1. 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
OCH695B
Determine the load (L) and
the Indoor/Outdoor Temperature
Temporarily select the Indoor/Outdoor Units
Indoor Unit
Total Indoor Units Capacity (CT ) = ∑ (Individual Rated Indoor Unit Capacity CT
i
Individual Indoor Temperature Correction Coef.
Outdoor Unit *1
Outdoor Unit Capacity (CT
o
Temperature Correction Coef. (Figure 2, 5) × Piping Length
Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating operation, 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 ×
n
k=1
α
) (Figure 1, 4)
k
) = Rated Outdoor Unit Capacity × Outdoor
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
12
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
max i
L ≤ CT
i
Yes
Need to select smaller
outdoor unit?
No
Does it fulfill the load of
each room?
Yes
Completed Selecting Units
Average Indoor temp. power input Coef. (
n
c
= ∑ {c × (M
k
ave
k=1
Outdoor Unit Input = Rated Outdoor Unit Input ×
× (CT )
i
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
No
Yes
No
c
)
ave
n
/ ∑ M )}
k k
k=1
c
ave