Data; Cooling And Heating Capacity And Characteristics; Method For Obtaining System Cooling And Heating Capacity; Sample Calculation - Mitsubishi Electric PUMY-P112VKM1 Service Manual

DATA

4

4-1. COOLING AND HEATING CAPACITY AND CHARACTERISTICS

4-1-1. Method for obtaining system cooling and heating capacity:

To obtain the system cooling and heating capacity and the electrical characteristics of the outdoor unit, first add up the ratings
of all the indoor units connected to the outdoor unit (see table below), and then use this total to find the standard capacity with
the help of the tables on "4-3. STANDARD CAPACITY DIAGRAM".
(1) Capacity of indoor unit
Model Number
for indoor unit
P•FY Series
Model
Capacity
Model Number
Model 15
M Series
for indoor unit
S Series
Model
P Series
Capacity

(2) Sample calculation

1
System assembled from indoor and outdoor unit (in this example the total capacity of the indoor units is greater than that of
the outdoor unit)
• Outdoor unit PUMY-P125YKM1
• Indoor unit PKFY-P25VBM-E o 2 , PLFY-P50VLMD-E o 2
2
According to the conditions in
3
The following figures are obtained from the 16.8 total capacity of indoor units, referring the standard capacity diagram in
"4-3-3. PUMY-P125VKM1(-BS) PUMY-P125YKM1(-BS) <cooling>" and "4-3-4. PUMY-P125VKM1(-BS)
PUMY-P125YKM1(-BS) <heating>" :
Capacity (kW)
Cooling Heating
A B
14.60 16.33
4-1-2. Method for obtaining the heating and cooling capacity of an indoor unit:
(1) The capacity of each indoor unit (kW) = the capacity
(2) Sample calculation (using the system described above in 4-1-1. (2) ):
During cooling:
• The total model capacity of the indoor unit is:
2.8 o 2 + 5.6 o 2=16.8kW
Therefore, the capacity of PKFY-P25VBM-E and
PLFY-P50VLMD-E will be calculated as follows
by using the formula in 4-1-2. (1):
2.8
Model 25=14.6 o
16.8
5.6
Model 50=14.6 o
16.8
OCH576
Model 15 Model 20 Model 25 Model 32
1.7 2.2 2.8
Model 18
Model 20 Model 22 Model 25 Mod 35 Model 42 Model 50 Model 60 Model 71
1.5 1.8 2.0
, the total capacity of the indoor unit will be: 2.8 o 2 + 5.6 o 2 = 16.8
1
Outdoor unit power consumption (kW) Outdoor unit current (A)/400 V
Cooling Heating
3.51 3.44
= 2.43 kW
= 4.87 kW
Model 40 Model 50 Model 63
3.6 4.5 5.6 7.1
2.2 2.5 3.5 4.2
Cooling
5.34
) o
A (or B
total model capacity of all indoor units
• The total model capacity of indoor unit is:
3.2 o 2 + 6.3 o 2=19.0
Therefore, the capacity of PKFY-P25VBM-E and
PLFY-P50VLMD-E will be calculated as follows by
using the formula in 4-1-2. (1):
Model 25=16.33 o
Model 50=16.33 o
11
Model 71 Model 80 Model 100
8.0 9.0 11.2
5.0 6.0 7.1
Heating
5.23
model capacity
During heating:
3.2
= 2.75 kW
19.0
6.3
= 5.41 kW
19.0
Model 125 Model 140
14.0 16.0
Model 80
Model 100
8.0
10.0