-
126
-
'18 • SCM-T-251
6. SELECTION CHARTS
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.
Net capacity = Capacity shown on specification×Correction factors as follows.
(1) Coefficient of cooling and heating capacity in relation to temperatures
0510 15-5-10-15
0.6
0.7
0.8
0.9
1.0
1.2
1.1
1.3
Outdoor air WB temperature℃WB
0
-5
-10
-15
ISO-T1 Standard condition
Coefficient of cooling &
Heating capacity in
relation to temperature
Heating operation
Indoor air DB
temperature
℃DB
Cooling operation
Outdoor air DB
temperature
℃DB
24
26
20
25
30
35
40
43
10
15
20
25
30
(2) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor
units.
(3) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (1), (2) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
Air inlet temperature of
outdoor unit in ℃WB
Adjustment coefficient
-10
0.95
-15
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
or more
1.00
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0
Depends on installed situation
2220181614
Indoor air WB temperature℃WB
ISO-T1 Standard condition
Applicable range
Heating
Cooling
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SCM50ZS-S1 (SRK25ZSX-S : 3 units) with the piping length of 10m, indoor
wet-bulb temperature at 19.0℃ and outdoor dry-bulb temperature 35℃ is
× ×0.99 1.0 ≒ 5.55kW
Length 10m
Table of indoor unit combnation (Refer to pege 119)
Outdoor unit SCM50ZS-S1
Indoor unit SRK25ZSX-S × 3 units
Factor by air
temperatures
( 1.87 × 3 )
Net cooling capacity =
6. SELECTION CHARTS
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