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8. CAPACITY TABLES
Hyper Heating Inverter Y-Series
8-5. 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
Correction factor for partial load: K
Correction factor for a full load and above: K
0
Partial load factor: A
K = 1 - (1 - K
0
) × A
8-6. Correction at evaporation-temperature (ET) control
When the target evaporation temperature is changed, the capacity or the power input can be calculated by multiplying the
correction factor shown in the table below.
Outdoor inlet air temp. °CWB
6
4
2
1
0
-2
-4
-6
-8
-10
-20
Outdoor inlet air temp. °FWB
43
39
36
34
32
28
25
21
18
14
-4
PUHY-HP72TNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP96TNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP120TNU-A
1.00
0.93
0.82
0.80
0.82
0.86
0.90
0.90
0.95
0.95
0.95
PUHY-HP144TSNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP192TSNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP240TSNU-A
1.00
0.93
0.82
0.80
0.82
0.86
0.90
0.90
0.95
0.95
0.95
PUHY-HP72YNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP96YNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP120YNU-A
1.00
0.93
0.82
0.80
0.82
0.86
0.90
0.90
0.95
0.95
0.95
PUHY-HP144YSNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP192YSNU-A
1.00
0.95
0.84
0.83
0.83
0.87
0.90
0.95
0.95
0.95
0.95
PUHY-HP240YSNU-A
1.00
0.93
0.82
0.80
0.82
0.86
0.90
0.90
0.95
0.95
0.95
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.
ET *1
°C
6
9
11
14
°F
43
48
52
57
Correction factor
Capacity
0.90
0.83
0.71
0.55
Power Input
0.90
0.72
0.54
0.36
*1 The evaporation temperature in operation may be different from the preset target evaporation
temperature because it depends on such factors as the unit protection control.
The capacity and power input could also fluctuate.
*2 Use the table above which indicates the unit properties as a reference
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