Data; Cooling And Heating Capacity And Characteristics; Method For Obtaining System Cooling And Heating Capacity; Capacity Of Indoor Unit - Mitsubishi Electric City Multi PUMY-P36NHMU Technical & Service Manual

5

DATA

5-1. COOLING AND HEATING CAPACITY AND CHARACTERISTICS

5-1-1. 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 5-2.STANDARD CAPACITY DIAGRAM.

(1) Capacity of indoor unit

Model Number for indoor unit
Model 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-P48NHMU
PKFY-P08NAMU-E o 2 , PLFY-P18NLMU-E o 2
• Indoor unit
2 According to the conditions in 1, the total capacity of the indoor unit will be: 8 o 2 + 18 o 2 = 52
3
The following figures are obtained from the 52 total capacity row of the standard capacity table (5-2.):
Capacity (Btu/h)
Cooling
Heating
A B
48,900
54,500
5-1-2. Method for obtaining the heating and cooling capacity of an indoor unit:
(1) The capacity of each indoor unit (Btu/h) = the capacity
(2) Sample calculation (using the system described above in 5-1-1. (2) ):
During cooling:
• The total model capacity of the indoor unit is:
8000 o 2 + 18000 o 2=52000Btu/h
Therefore, the capacity of PKFY-P08NAMU-E and
PLFY-P18NLMU-E will be calculated as follows by
using the formula in 5-1-2. (1):
8000
Model 08= 48,900 o
52000
18000
Model 18= 48,900 o
52000
Model 06 Model 08 Model12
6 8 12
Outdoor unit power consumption (kW)
Cooling Heating
5.01 4.71
= 7,520 Btu/h
= 16,930 Btu/h
Model 15 Model 18 Model 24
15 18 24
Outdoor unit current (A)/230V
Cooling
Heating
21.9
20.6
) o
A B
(or
total model capacity of all indoor units
• The total model capacity of indoor unit is:
9000 o 2 + 20000 o 2=58000 Btu/h
Therefore, the capacity of PKFY-P08NAMU-E and
PLFY-P18NLMU-E will be calculated as follows by
using the formula in 5-1-2. (1):
Model 08=54,500 o
Model 18= 54,500 o
12
Model 27 Model 30 Model 36
27 30 36
model capacity
During heating:
9000
= 8,460 Btu/h
58000
20000
= 18,790 Btu/h
58000
Model 48 Model 54
48 54