-
137
-
'17 • SCM-T-225
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
0
5
10
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
22
20
18
16
14
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 SCM80ZM-S1 (SRK25ZSX-S : 4 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
≒
7.84kW
Length 10m
Table of indoor unit combnation (Refer to pege 130)
Outdoor unit SCM80ZM-S1
Indoor unit SRK25ZSX-S
×
4 units
Factor by air
temperatures
( 1.98
×
4 )
Net cooling capacity =
6. SELECTION CHARTS
