Data; Cooling And Heating Capacity And Characteristics; Method For Obtaining System Cooling And Heating Capacity - Mitsubishi PUMY-P60NKMU Technical & Service Manual

4

DATA

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 4-2. STANDARD CAPACITY DIAGRAM.
(1) Capacity of indoor unit
Model number for
Model 06 Model 08 Model 12 Model 15 Model 18 Model 24 Model 27 Model 30 Model 36 Model 48 Model 54 Model 72
indoor unit
Model Capacity 6
(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-P60NKMU
PKFY-P08NAMU-E o 2 , PLFY-P18NBMU-E o 3
• Indoor unit
According to the conditions in 1, the total capacity of the indoor unit will be: 8 o 2 + 18 o 3 = 70
2
The following figures are obtained from the 52 total capacity row of the standard capacity table (4-2.):
3
Capacity (Btu/h)
Cooling Heating
62,000 68,000
A B
4-1-2. 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 4-1-1. (2) ):
During cooling:
• The total model capacity of the indoor unit is:
8000 o 2 + 18000 o 3 = 70000Btu/h
Therefore, the capacity of PKFY-P08NAMU-E and
PLFY-P18NBMU-E will be calculated as follows by
using the formula in 4-1-2. (1):
8000
Model 08= 62,000 o
70000
18000
Model 18= 62,000 o
70000
OCH502C
8 12 15 18
Outdoor unit power consumption (kW) Outdoor unit current (A)/230V
Cooling Heating
4.62 5.91
= 7,090 Btu/h
= 15,940 Btu/h
11
24 27 30
Cooling Heating
20.3 26.0
model capacity
) o
(or
A B
total model capacity of all indoor units
During heating:
• The total model capacity of indoor unit is:
9000 o 2 + 20000 o 3 = 78000 Btu/h
Therefore, the capacity of PKFY-P08NAMU-E and
PLFY-P18NBMU-E will be calculated as follows by
using the formula in 4-1-2. (1):
9000
Model 08= 68,000 o
78000
20000
Model 18= 68,000 o
78000
36 48 54 72
= 7,850 Btu/h
= 17,440 Btu/h