Mitsubishi Electric PUMY-P36NKMU3 Technical & Service Manual page 16

3. Power input of outdoor unit
Outdoor unit: PUMY-P36NKMU3
Indoor unit 1: PEFY-P15
Indoor unit 2: PEFY-P18
<Cooling>
(1) Rated power input of outdoor unit
(2) Calculation of the average indoor temperature power input coefficient
Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 68.0°F [20.0°C] W.B.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 64.4°F [18.0°C] W.B.)
Average indoor temp. power input coefficient (
Correction Coefficient of Indoor temperature = 1.04 × 15/(15 + 18) + 0.85 × 18/(15 + 18)
(3) Coefficient of the partial load (CTi)
Total Indoor units capacity
15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in "4-4.STANDARD CAPACITY DIAGRAM".)
(4) Outdoor power input (PIo)
Maximum System Capacity (CTx) = Total Outdoor unit Capacity (CTo), so use the following formula
PIo = Outdoor unit Cooling Rated Power Input × Correction Coefficient of Indoor temperature ×
= 2.31 × 0.94 × 0.9
= 1.95 kW
OCH733
2.31 kW
n
c
)
= ∑ {c
k
ave
k=1
n: Total number of the indoor units
k: Number of the indoor unit
c : Outdoor unit power input coefficient of k indoor unit room temp.
k
M : Number part of the k indoor unit model (e.g. P80 → 80)
k
= 0.94
1.04 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
0.85 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
n
×
(M / ∑ M )}
k k
k=1
16
(CTi)