MXZ-SM48NAM Service Manual

14
OCH789
4
DATA
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.
No
Yes
Temporarily select the Indoor/Outdoor Units
Reselect the outdoor units
Reselect the indoor units
Reselect the outdoor units
Reselect the indoor units
Indoor Unit
n
Total Indoor Units Capacity (CT
i
) = ∑ (Individual Rated Indoor Unit Capacity CT
ik
×
k=1
Individual Indoor Temperature Correction Coef. α
k
) (Figure 1, 4)
Outdoor Unit
*1
Outdoor Unit Capacity (CT
o
) = Rated Outdoor Unit Capacity × Outdoor
Temperature Correction Coef. (Figure 2, 5) × Piping Length
Correction Coef. (Figure 3, 6) × Defrost Correction Coef. (in heating operation, Table 1)
Maximum Capacity(CT
max
) = CT
o
Yes
Completed Selecting Units
Want to change to smaller
indoor units?
Does it fulfill the load of
each room?
CT
o
≤ CT
i
L ≤ CT
o
Maximum Capacity(CT
max
) = CT
i
L ≤ CT
i
Need to select smaller
outdoor unit?
Does it fulfill the load of
each room?
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
ave
Determine the load (L) and
the Indoor/Outdoor Temperature
n: Total Number of Indoor Units
k: Indoor Unit Number
Yes
No
No
No
No
Yes
No
No
Yes
Yes
Capacity
Determination
Input
Calculation
Average Indoor temp. power input Coef. (
c
ave
) Average Indoor temp. power input Coef. (
c
ave
)
c
ave
= ∑ {c
k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
c
ave
= ∑ {c
k
× (M
k
/ ∑ M
k
)}
n
k=1
n
k=1
(If indoor to outdoor connectable
capacity ratio is less than 100%, the
capacity correction is set as 100% )
*c
k
: Outdoor unit power input coefficient of k indoor unit room temp. (Refer to 4-2.)
*M
k
: Number part of the k indoor unit model (e.g. P80 → 80)
∑ (CT
im
× α
m
)
n
m=1
Individual Indoor Unit Capacity: CT'
ik
= CT
max
×
CT
ik
× α
k
Outdoor Unit Input = Rated Outdoor Unit Input ×
c
ave
× (CT
i
)
Completed Selecting Units
(x) is the approximate correction function when less than or equal
100% model size units are input as connected.
Yes