-
21
-
(3)
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 equivalent piping length between the indoor
and outdoor units.
(4)
When the outdoor unit is located at a lower height than the indoor unit in cooling operation and when the outdoor unit is located
at a higher height than the indoor unit in heating operation, the following values should be subtracted from the values in the
above table.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
5m
10m
15m
20m
25m
30m
Adjustment coefficient
0.01
0.02
0.03
0.04
0.05
0.06
(2)
Correction of cooling and heating capacity in relation to air flow rate control (fan speed)
Coefficient: 1.00 at High, 0.95 at Low
Note
(1) Calculate the equivalent length using the following formula.
However, install the piping so that the equivalent length is 5 m of the piping distance limit (actual length) for each respective piping system.
●
Equivalent length = Actual (equivalent length of bends x number of bends in the piping)
Equivalent length for 1 bend
0.15
ø9.52
ø15.88
0.25
Gas pipe diameter (mm)
Bend equivalent length
Equivalent piping length
(1)
(m)
7.5
10
15
20
25
30
35
40
45
50
55
Heating
1
1
1
1
1
0.998
0.998
0.993
0.993
0.988
0.988
ø
15.88
1
0.996
0.989
0.982
0.975
0.968
0.961
0.954
0.947
0.940
0.933
ø
19.05
1.008
1.006
1.003
1
0.997
0.994
0.991
0.988
0.985
0.982
0.979
Cooling
• Outdoor air temperature degree 5˚C or more
Equivalent piping length
(1)
(m)
7.5
10
15
20
25
30
35
40
45
50
55
Heating
1
1
1
1
1
0.998
0.998
0.993
0.993
0.988
0.988
ø
15.88
0.800
0.793
0.779
0.765
0.751
0.738
0.724
0.710
0.696
0.682
0.669
ø
19.05
0.806
0.798
0.786
0.774
0.762
0.750
0.738
0.727
0.715
0.703
0.691
Cooling
• Outdoor air temperature degree -5˚C or more
Equivalent piping length
(1)
(m)
7.5
10
15
20
25
30
35
40
45
50
55
Heating
1
1
1
1
1
0.998
0.998
0.993
0.993
0.988
0.988
ø
15.88
0.600
0.590
0.569
0.549
0.528
0.507
0.487
0.466
0.446
0.425
0.404
ø
19.05
0.605
0.590
0.569
0.548
0.527
0.507
0.486
0.465
0.444
0.424
0.403
Cooling
• Outdoor air temperature degree -15˚C or more
