Selection Chart - Mitsubishi Heavy Industries SRK25GZ-L1 Handbook

20.2.6 Selection chart

(1) Correct the cooling and heating capacity in accordance with the conditions as follows.The net cooling and heating capacity can
be,obtained in the following way.
Indoor unit
Each indoor unit = System performance
Outdoor unit
Performance from connected capacity
outdoor temperature conditions
System performance =
correction coefficient from difference between indoor and outdoor temperature)
(correction coefficient from condensation when heating).
Note: Refer to page 997 and 998 for the correction coefficient.
(a) Coefficient of cooling and heating capacity in relation to temperatures
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
43
40
35
30
Cooling
25
20
0
–5
27
Heating
25
20
15
10
(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping.
Equivalent piping length [m]
Cooling
Heating
Equivalent piping length [m]
Cooling
Heating
Equivalent piping length [m]
Cooling
Heating
Note (1) Equivalent piping length can be obtained by calculating as follows.
Equivalent piping length = Real gas piping length + Number of bends in gas piping × Equivalent piping length of bends.
Equivalent length of each joint
Gas piping size
Joint (90˚elbow)
Indoor unit capacity when operating simultaneously.
Cooling
20 22 24 26
14 16
Indoor wet bulb temperature (˚CWB)
-10 -5 0
Outdoor wet bulb temperature (˚CWB)
(1) 5 10 15
1.0 0.99 0.975
1.0 1.0 1.0
55 60 65
0.875 0.865 0.85
0.985 0.98 0.98
105 110 115
0.745 0.74 0.725
0.96 0.955 0.955
φ12.7 φ15.88
0.10
Indoor unit capacity
correction coefficient from indoor and
(correction coefficient from piping distance
Heating
Range in which
use is possible
18 20 22
JIS
5 10 15
JIS
20 25 30 35
0.965 0.95 0.94 0.925
1.0 1.0 0.995 0.995
70 75 80 85
0.84 0.825 0.815 0.8
0.975 0.975 0.97 0.97
120 125
0.715 0.7
0.95 0.95
φ19.05 φ25.4
0.10 0.15 0.15
FDC-HKXR
26
24
18.5
40 45 50
0.915 0.9 0.89
0.99 0.99 0.985
90 95 100
0.79 0.775 0.765
0.965 0.965 0.96
Unit : m/one part
φ28.58
0.20
997