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7. CAPACITY TABLES
7-5. Correction at frost and defrost
Due to frost at the outdoor heat exchanger and the automatic defrost operation, the heating capacity of the outdoor unit can be
calculated by multiplying the correction factor shown in the table below.
Table of correction factor at frost and defrost
Outdoor inlet air temp. °FWB
Outdoor inlet air temp. °CWB
Correction factor
The high humidity condition (e.g., a foggy atmosphere) which causes frost forming on the heat exchanger will worsen the heating performance
of the unit.
The snow blowing to the heat exchanger will worsen the heating performance of the unit. Install a snow hood as a preventive measure.
* The correction factors in the table above are used for a full-load and above.
Use the formula below to calculate the correction factor to use for a partial load.
Correction factor for partial load: K
Correction factor for a full load and above: K
Partial load factor: A
K = 1 - (1 - K
) × A
0
M-P0891A
43
39
36
32
6
4
2
0
1.00
0.98
0.89
0.88
0
28
25
21
18
-2
-4
-6
-8
0.89
0.90
0.95
0.95
S-Series
14
5
-4
-13
-10
-15
-20
-25
0.95
0.95
0.95
0.95
26
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